INSURED MUNICIPAL SECURITIES TR 49TH DIS SE SER 23 NEW YORK
485BPOS, 1997-04-25
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     As filed with the Securities and Exchange Commission on April 25, 1997

                                                      Registration No. 33-31426*
    

===============================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                            POST-EFFECTIVE AMENDMENT
                                       To
                                    FORM S-6

                    FOR REGISTRATION UNDER THE SECURITIES ACT
                    OF 1933 OF SECURITIES OF UNIT INVESTMENT
                        TRUSTS REGISTERED ON FORM N-8B-2

   
A.   Exact name of trust:       INSURED MUNICIPAL SECURITIES TRUST, SERIES
                                23 & NEW YORK NAVIGATOR INSURED SERIES 2,
                                NEW YORK NAVIGATOR INSURED SERIES 3, AND NEW
                                YORK NAVIGATOR INSURED SERIES 6 & NEW JERSEY
                                NAVIGATOR INSURED SERIES 3

B.   Name of depositors:        REICH & TANG DISTRIBUTORS L.P.
                                GRUNTAL & CO., L.L.C.
    

C.   Complete address of depositors' principal executive offices:

     Reich & Tang Distributors L.P.      Gruntal & Co., Incorporated
     600 Fifth Avenue                    14 Wall Street
     New York, NY 10020                  New York, NY 10005

D.   Name and complete address of agent for service:

   
     PETER J. DeMARCO      LEE FENSTERSTOCK      Copy of comments to:
     Executive             President             MICHAEL R. ROSELLA, ESQ.
       Vice President      Gruntal & Co.,        Battle Fowler LLP
     Reich & Tang            L.L.C.              75 East 55th Street
       Distributors L.P.   14 Wall Street        New York, NY 10022
     600 Fifth Avenue      New York, NY 10005    (212) 856-6858
     New York, NY 10020
    

It is proposed that this filing become effective (check appropriate box)

   
/   /  immediately upon filing pursuant to paragraph (b) of Rule 485
/ x /  on April 30, 1997 pursuant to paragraph (b)
/   /  60 days after filing pursuant to paragraph (a)
/   /  on (       date       ) pursuant to paragraph (a) of Rule 485
    

===============================================================================

   
*    The Prospectus included in this Registration constitutes a combined
     Prospectus as permitted by the Provisions of Rule 429 of the General Rules
     and Regulations under the Securities Act of 1933 (the "Act"). Said
     Prospectus covers units of undivided interest in Insured Municipal
     Securities Trust, Series 23 & New York Navigator Insured Series 2, New York
     Navigator Insured Series 3, and New York Navigator Insured Series 6 & New
     Jersey Navigator Insured Series 3, covered by prospectuses heretofore filed
     as part of separate registration statements on Form S-6 (Registration Nos.
     33-31426, 33-34944 and 33-37849, respectively) under the Act. This filing
     constitutes Post-Effective Amendment No. 7 for Series 23 & New York
     Navigator Insured Series 2, New York Navigator Insured Series 3, and
     Post-Effective Amendment No. 6 for New York Navigator Insured Series 6 &
     New Jersey Navigator Insured Series 3.

     Each of the Registrants declares that an indefinite number of its units are
     being registered by this Registration Statement pursuant to Section 24(f)
     under the Investment Company Act of 1940, as amended, and Rule 24f-2
     thereunder, and each of the Registrants filed a Rule 24f-2 Notice for its
     fiscal year ended December 31, 1996 on February 28, 1997.
    

786.1
<PAGE>

   
                     Prospectus Part A Dated April 30, 1997
    

                       INSURED MUNICIPAL SECURITIES TRUST

                                    SERIES 23

- --------------------------------------------------------------------------------

   
                  The Trust is a unit investment trust designated Series 23
("Insured Municipal Trust") with an underlying portfolio of long-term insured
tax-exempt bonds issued by or on behalf of states, municipalities and public
authorities and was formed to preserve capital and to provide interest income
(including, where applicable, earned original issue discount) which, in the
opinions of bond counsel to the respective issuers, is, with certain exceptions,
currently exempt from regular federal income tax under existing law but may be
subject to state and local taxes. There can be no assurance that the Trust's
investment objectives will be achieved. Although the Supreme Court has
determined that Congress has the authority to subject interest on bonds such as
the Bonds in the Trust to regular federal income taxation, existing law excludes
such interest from regular federal income tax. Such interest income may,
however, be subject to the federal corporate alternative minimum tax and to
state and local taxes. In addition, capital gains are subject to tax. (See "Tax
Status" and "The Trust--Portfolio" in Part B of this Prospectus.) The Sponsors
are Reich & Tang Distributors L.P. and Gruntal & Co., L.L.C. (sometimes referred
to as the "Sponsor" or the "Sponsors"). The value of the Units of the Trust will
fluctuate with the value of the underlying bonds. Minimum purchase: 1 Unit.

                  This Prospectus consists of two parts. Part A contains the
Summary of Essential Information as of December 31, 1996 (the "Evaluation
Date"), a summary of certain specific information regarding the Trust and
audited financial statements of the Trust, including the related portfolio, as
of the Evaluation Date. Part B of this Prospectus contains a general summary of
the Trust. Part A of this Prospectus may not be distributed unless accompanied
by Part B. Investors should retain both parts of this Prospectus for future
reference.
    

         THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
         SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
         NOR HAS THE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON
         THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
         CONTRARY IS A CRIMINAL OFFENSE.

- --------------------------------------------------------------------------------

   
                  THE TRUST. The Trust seeks to achieve its investment
objectives through investment in a fixed, diversified portfolio of long-term
insured bonds (the "Bonds") issued by or on behalf of states, municipalities and
public authorities which, because of irrevocable insurance, were rated "AAA" by
Standard & Poor's Corporation at the time originally deposited in the Trust. The
"AAA" rating results from insurance relating only to the Bonds in the Trust and
not to Units of the Trust. The insurance does not remove market risk, as it does
not guarantee the market value of the Units. For a discussion of the
significance of such ratings, see "Description of Bond Ratings" in Part B of
this Prospectus, and for a list of ratings on the Evaluation Date see the
"Portfolio."

                  Some of the Bonds may be "Zero Coupon Bonds", which are
original issue discount bonds that provide for payment at maturity at par value,
but do not provide for the payment of any current interest. Some of the Bonds in
the Trust have been issued with optional refunding or refinancing provisions
("Refunded Bonds") whereby the issuer of the Bond has the right to call such
    

109804.1

<PAGE>



   
Bond prior to its stated maturity date (and other than pursuant to sinking fund
provisions) and to issue new bonds ("Refunding Bonds") in order to finance the
redemption. Issuers typically utilize refunding calls in order to take advantage
of lower interest rates in the marketplace. Some of these Refunded Bonds may be
called for redemption pursuant to pre-refunding provisions ("Pre-Refunded
Bonds") whereby the proceeds from the issue of the Refunding Bonds are typically
invested in government securities in escrow for the benefit of the holders of
the Pre-Refunded Bonds until the refunding call date. Usually, Pre-Refunded
Bonds will bear a triple-A rating because of this escrow. The issuers of
Pre-Refunded Bonds must call such Bonds on their refunding call date. Therefore,
as of such date, the Trust will receive the call price for such bonds but will
cease receiving interest income with respect to them. For a list of those Bonds
which are Pre-Refunded Bonds, if any, as of the Evaluation Date, see "Notes to
Financial Statements" in this Part A. Some of the Bonds in the portfolio may
have been purchased at an aggregate premium over par. The payment of interest
and preservation of capital are, of course, dependent upon the continuing
ability of issuers of the Bonds or the insurers thereof to meet their
obligations.

                  Investment in the Trust should be made with an understanding
of the risks which an investment in long-term fixed rate debt obligations may
entail, including the risk that the value of the underlying portfolio will
decline with increases in interest rates, and that the value of Zero Coupon
Bonds is subject to greater fluctuation than coupon bonds in response to changes
in interest rates. A Trust designated as a long-term trust must have a
dollar-weighted average portfolio maturity of more than ten years.

                  Each Unit in the Trust represents a 1/4221st undivided
interest in the principal and net income of the Trust. The principal amount of
Bonds deposited in the Trust per Unit is reflected in the Summary of Essential
Information. (See "Organization" in Part B of this Prospectus.) The Units being
offered hereby are issued and outstanding Units which have been purchased by the
Sponsor in the secondary market.

                  INSURANCE. Each of the Bonds in the Trust is insured by a
municipal bond guaranty insurance policy obtained by either the Sponsor
("Sponsor-Insured Bonds") or the issuers of the Bonds ("Pre-Insured Bonds") and
issued by one of the insurance companies (the "Insurance Companies"), described
under "Insurance on the Bonds" in Part B of this Prospectus, covering scheduled
payment of principal thereof and interest thereon when such amounts shall become
due for payment but shall not have been paid by the issuer or any other insurer
thereof. None of the insurance will cover accelerated payments of principal or
penalty interest or premiums unrelated to taxability of interest on the Bonds
(although the insurance, including insurance obtained by MBIA Corp., does
guarantee payment of principal and interest in such amounts and at such times as
such amounts would have been due absent such acceleration). The insurance
relates only to the prompt payment of principal of and interest on the
securities in the portfolio, and does not remove market risks or guarantee the
market value of the Units in the Trust. The terms of the insurance are more
fully described under "Insurance on the Bonds" in Part B of this Prospectus. For
a discussion of the effect of an occurrence of nonpayment of principal or
interest on any Bonds in the Trust, see "Portfolio Supervision" in Part B of
this Prospectus. No representation is made herein as to any Bond insurer's
ability to meet its obligations under a policy of insurance relating to any of
the Bonds. In addition, investors should be aware that, subsequent to the Date
of Deposit, the rating of the claims paying ability of the insurer of an
underlying Bond may be downgraded, which may result in a downgrading of the
rating of the Units in the Trust. The approximate percentage of the aggregate
principal amount of the portfolio that is insured by each insurance company is
as follows: AMBAC Indemnity
    

                                                      A-2

109804.1

<PAGE>



   
Corp. ("AMBAC"), 12.6%; Capital Guaranty Insurance Company ("Capital
Guaranty"), 74.3%; and MBIA Corp., 13.1%.

                  PUBLIC OFFERING PRICE. The secondary market Public Offering
Price of each Unit is equal to the aggregate bid price of the Bonds in the Trust
divided by the number of Units outstanding, plus a sales charge of 4.10% of the
Public Offering Price, or 4.274% of the net amount invested in Bonds per Unit.
In addition, accrued interest to the expected date of settlement is added to the
Public Offering Price. If Units had been purchased on the Evaluation Date, the
Public Offering Price per Unit would have been $721.64 plus accrued interest of
$9.18 under the monthly distribution plan, $13.03 under the semi-annual
distribution plan and $12.99 under the annual distribution plan, for a total of
$730.82, $734.67 and $734.63, respectively. The Public Offering Price per Unit
can vary on a daily basis in accordance with fluctuations in the aggregate bid
price of the Bonds. (See "Public Offering--Offering Price" in Part B of this
Prospectus.)

                  ESTIMATED LONG TERM RETURN AND ESTIMATED CURRENT RETURN. Units
of each Trust are offered to investors on a "dollar price" basis (using the
computation method described under "Public Offering--Offering Price" in Part B)
as distinguished from a "yield price" basis often used in offerings of tax
exempt bonds (involving the lesser of the yield as computed to maturity of bonds
or to an earlier redemption date). Since they are offered on a dollar price
basis, the rate of return on an investment in Units of each Trust is measured in
terms of "Estimated Current Return" and "Estimated Long Term Return".
    

                  Estimated Long Term Return is calculated by: (1) computing the
yield to maturity or to an earlier call date (whichever results in a lower
yield) for each Bond in the Trust's portfolio in accordance with accepted bond
practices, which practices take into account not only the interest payable on
the Bond but also the amortization of premiums or accretion of discounts, if
any; (2) calculating the average of the yields for the Bonds in the Trust's
portfolio by weighing each Bond's yield by the market value of the Bond and by
the amount of time remaining to the date to which the Bond is priced (thus
creating an average yield for the portfolio of the Trust); and (3) reducing the
average yield for the portfolio of the Trust in order to reflect estimated fees
and expenses of the Trust and the maximum sales charge paid by investors. The
resulting Estimated Long Term Return represents a measure of the return to
investors earned over the estimated life of the Trust. (For the Estimated Long
Term Return to Certificateholders under the monthly, semi-annual and annual
distribution plans, see "Summary of Essential Information".)

                  Estimated Current Return is a measure of the Trust's cash
flow. Estimated Current Return is computed by dividing the Estimated Net Annual
Interest Income per Unit by the Public Offering Price per Unit. In contrast to
the Estimated Long Term Return, the Estimated Current Return does not take into
account the amortization of premium or accretion of discount, if any, on the
Bonds in the portfolio of the Trust. Moreover, because interest rates on Bonds
purchased at a premium are generally higher than current interest rates on newly
issued bonds of a similar type with comparable rating, the Estimated Current
Return per Unit may be affected adversely if such Bonds are redeemed prior to
their maturity.

                  The Estimated Net Annual Interest Income per Unit of the Trust
will vary with changes in the fees and expenses of the Trustee and the Evaluator
applicable to the Trust and with the redemption, maturity, sale or other
disposition of the Bonds in the Trust. The Public Offering Price will vary with
the changes in the bid prices of the Bonds. Therefore, there is no assurance
that the present Estimated Current Return or Estimated Long Term Return will be
realized in the future. (For the Estimated Current Return to

                                                      A-3

109804.1

<PAGE>



Certificateholders under the monthly, semi-annual and annual distribution plans,
see "Summary of Essential Information". See "Estimated Long Term Return and
Estimated Current Return" in Part B of this Prospectus.)

                  A schedule of cash flow projections is available from the
Sponsor upon request.

                  DISTRIBUTIONS. Distributions of interest income, less
expenses, will be made by the Trust either monthly, semi-annually or annually
depending upon the plan of distribution applicable to the Unit purchased. A
purchaser of a Unit in the secondary market will initially receive distributions
in accordance with the distribution plan chosen by the prior owner of such Unit
and may thereafter change the plan as provided under "Interest and Principal
Distributions" in Part B of the Prospectus. Distributions of principal, if any,
will be made semi-annually on June 15 and December 15 of each year. (See "Rights
of Certificateholders--Interest and Principal Distributions" in Part B of this
Prospectus. For estimated monthly, semi-annual and annual interest
distributions, see "Summary of Essential Information".)

   
                  MARKET FOR UNITS. The Sponsor, although not obligated to do
so, presently maintains and intends to continue to maintain a secondary market
for the Units at prices based on the aggregate bid price of the Bonds in the
Trust portfolio. The reoffer price will be based on the aggregate bid price of
the Bonds plus a sales charge of 4.10% of the Public Offering Price (4.274% of
the net amount invested), plus net accrued interest. If a market is not
maintained a Certificateholder will be able to redeem his or her Units with the
Trustee at a price also based on the aggregate bid price of the Bonds. (See
"Liquidity--Sponsor Repurchase" and "Public Offering--Offering Price" in Part B
of this Prospectus.)
    

                  TOTAL REINVESTMENT PLAN. Certificateholders under the
semi-annual and annual plans of distribution have the opportunity to have all
their regular interest distributions, and principal distributions, if any,
reinvested in available series of "Insured Municipal Securities Trust" or
"Municipal Securities Trust." (See "Total Reinvestment Plan" in Part B of this
Prospectus. Residents of Texas, see "Total Reinvestment Plan for Texas
Residents" in Part B of this Prospectus.) The Plan is not designed to be a
complete investment program.


                                                      A-4

109804.1

<PAGE>



                       INSURED MUNICIPAL SECURITIES TRUST
                                    SERIES 23

            SUMMARY OF ESSENTIAL INFORMATION AS OF DECEMBER 31, 1996

<TABLE>
<CAPTION>

   
Date of Deposit:  May 10, 1990                                    Minimum Principal Distribution:
- ---------------                                                   ------------------------------
<S>                                          <C>                     <C>            
Principal Amount of Bonds ...                $2,860,000              $1.00 per Unit.
- -------------------------
Number of Units .............                4,221                Weighted Average Life to Maturity:
- ---------------                                                   ---------------------------------
Fractional Undivided Inter-                                          14.1 Years.
- --------------------------
  est in Trust per Unit .....                1/4221               Minimum Value of Trust:
  ---------------------                                           ----------------------
Principal Amount of                                                  Trust may be terminated if value
- -------------------
  Bonds per Unit ............                $677.56                 of Trust is less than $2,000,000
  --------------
Secondary Market Public                                              in principal amount of Bonds.
- -----------------------
  Offering Price**                                                Mandatory Termination Date:
  Aggregate Bid Price                                                The earlier of December 31, 2039
    of Bonds in Trust .......                $2,921,180+++           or the disposition of the last
  Divided by 4,221 Units ....                $692.06                 Bond in the Trust.
  Plus Sales Charge of 4.10%                                      Trustee***:  The Chase Manhattan
                                                                  -------
    of Public Offering Price.                        $29.58          Bank.
  Public Offering Price                                           Trustee's Annual Fee:  Monthly
                                                                  --------------------
    per Unit ................                $721.64+                plan $.97 per $1,000; semi-annual
Redemption and Sponsors'                                             plan $.51 per $1,000; and annual
- ------------------------
  Repurchase Price                                                   plan is $.33 per $1,000.
  ----------------
  per Unit ..................                $692.06+             Evaluator:  Kenny S&P Evaluation
  --------                                                        ---------
                                                    +++              Services.
                                                    ++++          Evaluator's Fee for Each
Excess of Secondary Market                                           Evaluation:  Minimum of $15 plus
- --------------------------                                           ----------
  Public Offering Price                                              $.25 per each issue of Bonds in
  ---------------------
  over Redemption and                                                excess of 50 issues (treating
  -------------------
  Sponsors' Repurchase                                               separate maturities as separate
  --------------------
  Price per Unit ............                $29.58++++              issues).
  --------------
Difference between Public                                         Sponsors:  Reich & Tang
- -------------------------                                         --------
  Offering Price per Unit                                            Distributors L.P. & Gruntal & Co.,
  -----------------------
  and Principal Amount per                                           L.L.C.
  ------------------------
  Unit Premium/(Discount) ...                $44.08               Sponsors' Annual Fee:  Maximum of
  -----------------------                                         --------------------
Evaluation Time:  4:00 p.m.                                          $.25 per $1,000 principal amount
  New York Time.                                                     of Bonds (see "Trust Expenses and
                                                                     Charges" in
                                                                     Part B of
                                                                     this
                                                                     Prospectus).
    
</TABLE>



       PER UNIT INFORMATION BASED UPON INTEREST DISTRIBUTION PLAN ELECTED
<TABLE>
<CAPTION>

                                                             Monthly          Semi-Annual            Annual
                                                             Option             Option               Option

<S>                                                            <C>                  <C>                  <C>   
   
Gross annual interest income# .........                        $47.18               $47.18               $47.18
Less estimated annual fees and
  expenses ............................                          1.74                 1.43                 1.81
Estimated net annual interest                                  ______               ______               ______
  income (cash)# ......................                        $45.44               $45.75               $45.37
Estimated interest distribution# ......                          3.78                22.87                45.37
Estimated daily interest accrual# .....                         .1262                .1270                .1260
Estimated current return#++ ...........                         6.30%                6.34%                6.29%
Estimated long term return++ ..........                         4.76%                4.81%                4.75%
    
Record dates ..........................                      1st of           Dec. 1 and             Dec. 1
                                                             each month       June 1
Interest distribution dates ...........                      15th of          Dec. 15 and            Dec. 15
                                                             each month       June 15

</TABLE>

                                                      A-5

109804.1

<PAGE>



                                   Footnotes to Summary of Essential Information

   *    The Date of Deposit is the date on which the Trust Agreement was signed
        and the deposit of the Bonds with the Trustee made.

   
  **    For information regarding offering price per Unit and applicable sales
        charge under the Total Reinvestment Plan, see "Total Reinvestment Plan"
        in Part B of this Prospectus.

 ***    The Trustee maintains its principal executive office at 270 Park
        Avenue, New York, New York 10017 and its unit investment trust office
        at 4 New York Plaza, New York, New York 10004 (tel. no.:
        1-800-882-9898). For information regarding redemption by the Trustee,
        see "Trustee Redemption" in Part B of this Prospectus.

   +    Plus accrued interest to the expected date of settlement (approximately
        three business days after purchase) of $9.18 monthly, $13.03
        semi-annually and $12.99 annually.
    

  ++    The estimated current return and estimated long term return are
        increased for transactions entitled to a discount (see "Employee
        Discounts" in Part B of this Prospectus), and are higher under the
        semi-annual and annual options due to lower Trustee's fees and
        expenses.

 +++    Based solely upon the bid side evaluation of the underlying Bonds
        (including, where applicable, undistributed cash from the principal
        account). Upon tender for redemption, the price to be paid will be
        calculated as described under "Trustee Redemption" in Part B of this
        Prospectus.

++++    See "Comparison of Public Offering Price, Sponsor's Repurchase Price and
        Redemption Price" in Part B of this Prospectus.

   #    Does not include income accrual from original issue discount bonds, if
        any.

   
                      FINANCIAL AND STATISTICAL INFORMATION


Selected data for each Unit outstanding for the periods listed below:
<TABLE>
<CAPTION>
                                                                                                    Distribu-
                                                                                                    tions of
                                                           Distributions of Interest                Principal
                                                          During the Period (per Unit)               During
                                         Net Asset*                       Semi-                       the
                         Units Out-        Value          Monthly         Annual          Annual     Period
Period Ended              standing        Per Unit        Option          Option          Option    (Per Unit)
- ------------             ----------      ----------       -------         ------          ------    ----------

<S>                             <C>           <C>           <C>             <C>              <C>         <C>    
December 31, 1994               4,563         $987.69       $69.81          $70.46           $70.66      $ 19.83
December 31, 1995               4,550          979.99        67.78           68.43            68.45        52.46
December 31, 1996               4,221          704.13        55.92           56.28            55.86       241.91

</TABLE>

- --------
*        Net Asset Value per Unit is calculated by dividing net assets as
         disclosed in the "Statement of Net Assets" by the number of Units
         outstanding as of the date of the Statement of Net Assets. See Note 5
         of Notes to Financial Statements for a description of the components of
         Net Assets.
    

                                                      A-6

109804.1

<PAGE>



   
                                          INFORMATION REGARDING THE TRUST
                                              AS OF DECEMBER 31, 1996


DESCRIPTION OF PORTFOLIO

                  The portfolio of the Trust consists of 8 issues representing
obligations of issuers located in 6 states. The Sponsors have not participated
as a sole underwriter or manager, co-manager or member of an underwriting
syndicate from which any of the initial aggregate principal amount of the Bonds
were acquired. Approximately 8.4% of the Bonds are obligations of state and
local housing authorities; approximately 44.6% are hospital revenue bonds+;
approximately 12.5% were issued in connection with the financing of nuclear
generating facilities; and approximately 4.7% are "mortgage subsidy" bonds. All
of the Bonds in the Trust are subject to redemption prior to their stated
maturity dates pursuant to sinking fund or optional call provisions. The Bonds
may also be subject to other calls, which may be permitted or required by events
which cannot be predicted (such as destruction, condemnation, termination of a
contract, or receipt of excess or unanticipated revenues). None of the Bonds are
general obligation bonds. Eight issues representing $2,860,000 of the principal
amount of the Bonds are payable from the income of a specific project or
authority and are not supported by the issuer's power to levy taxes. The
portfolio is divided for purpose of issue as follows: Courthouse 1, Federally
Assisted Housing 1, Hospital 3, Mortgage Revenue 1, Nuclear Power 1 and Special
Obligation 1. For an explanation of the significance of these factors see "The
Trust--Portfolio" in Part B of this Prospectus.

                  As of December 31, 1996, $955,000 (approximately 33.4% of the
aggregate principal amount of the Bonds) were original issue discount bonds. Of
these original issue discount bonds, $240,000 (approximately 4.7% of the
aggregate principal amount of the Bonds) were Zero Coupon Bonds. Zero Coupon
Bonds do not provide for the payment of any current interest and provide for
payment at maturity at par value unless sooner sold or redeemed. The market
value of Zero Coupon Bonds is subject to greater fluctuations than coupon bonds
in response to changes in interest rates. Approximately 12.6% of the aggregate
principal amount of the Bonds in the Trust were purchased at a "market" discount
from par value at maturity, approximately 17.3% were purchased at a premium and
approximately 36.7% were purchased at par. For an explanation of the
significance of these factors see "Discount and Zero Coupon Bonds" in Part B of
this Prospectus.
    

                  None of the Bonds in the Trust are subject to the federal
individual alternative minimum tax under the Tax Reform Act of 1986.  See "Tax
Status" in Part B of this Prospectus.

   
- --------
+        A trust is considered to be "concentrated" in a particular category or
         industry when the securities in that category or industry constitute
         25% or more of the aggregate face amount of the portfolio. See Part B
         for disclosure, including risk factors, regarding this concentration.
    

                                                      A-7

109804.1
<PAGE>
                        Report of Independent Accountants


To the Sponsor, Trustee and Certificateholders of
Insured Municipal Securities Trust, Series 23

In our opinion, the accompanying statement of net assets, including the
portfolio of investments, and the related statements of operations and of
changes in net assets and the financial highlights present fairly, in all
material respects, the financial position of Insured Municipal Securities Trust,
Series 23 (the "Trust") at December 31, 1996, the results of its operations, the
changes in its net assets and the financial highlights for the year then ended,
in conformity with generally accepted accounting principles. These financial
statements and financial highlights (hereafter referred to as "financial
statements") are the responsibility of the Trust's management; our
responsibility is to express an opinion on these financial statements based on
our audit. We conducted our audit of these financial statements in accordance
with generally accepted auditing standards which require that we plan and
perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements, assessing the accounting principles used and significant estimates
made by management, and evaluating the overall financial statement presentation.
We believe that our audit, which included confirmation of securities at December
31, 1996 by correspondence with the Trustee, provides a reasonable basis for the
opinion expressed above. The financial statements for the prior periods
presented were audited by other independent accountants whose report dated March
31, 1996 expressed an unqualified opinion on those financial statements.




PRICE WATERHOUSE LLP
160 Federal Street
Boston, MA 02110
March 28, 1997


<PAGE>

<TABLE>
Insured Municipal Securities Trust, Series 23
Portfolio
December 31, 1996
- ------------------------------------------------------------------------------------------------------------------------------------
<CAPTION>
                                                                                                      Redemption
                 Aggregate                                                             Coupon Rate/     Feature(2)(4)
  Portfolio      Principal          Name of Issuer and                       Ratings    Date(s) of     S.F.-Sinking Fund    Market
     No.          Amount              Title of Bonds                           (1)      Maturity (2)    Ref.-Refunding      Value(3)

<S>          <C>              <C>                                            <C>       <C>           <C>                    <C>
     1       $      135,000   Alaska Hsg. Finc. Corp. Colltzd. Bonds           AAA     7.450%        6/01/11 @ 100 S.F.     141,893
                              1989 First Series (MBIA Corp.)                           12/01/2029    6/01/00 @ 102 Ref.

     2              415,000   Ill. Hlth. Facs. Auth. Rev. Rfndg. Bonds         AAA     7.600         2/15/06 @ 100 S.F.     472,810
                              (Michael Reese Hosp. & Med. Cntr.)                       2/15/2019     2/15/99 @ 101 Ref.
                              Series 1989 A (Capital Guaranty)

     3              500,000   Ind. Hlth. Fac. Finc. Auth. Hosp. Rev. Bonds     AAA     7.750         8/15/07 @ 100 S.F.     564,925
                              (Bartholomew Cnty. Hosp. Prjt.) Series 1990              8/15/2020     8/15/00 @ 102 Ref.
                              (Capital Guaranty)

    4a              200,000   N.Y. State Med. Care Facs. Finc. Agncy. Mental   AAA     7.875         8/15/11 @ 100 S.F.     216,206
                              Hlth. Servs. Facs. Imprvmnt. Rev. Bonds 1988             8/15/2015     8/15/98 @ 102 Ref.
                              Series B (Capital Guaranty)

    4b              160,000   N.Y. State Med. Care Facs. Finc. Agncy. Mental   AAA     7.875         8/15/11 @ 100 S.F.     171,714
                              Hlth. Servs. Facs. Imprvmnt. Rev. Bonds 1988             8/15/2015     8/15/98 @ 102 Ref.
                              Series A (Capital Guaranty)

     5              300,000   Triborough Bridge & Tunnel Auth. N.Y. Mtg.       AAA     7.125         Currently @ 100 S.F.    326,964
                              Recording Tax Spec. Oblig. Bonds Series 1989             1/01/2019     1/01/00 @ 101 Ref.
                              A (Capital Guaranty)

     6              550,000   Lawrence Cnty. S.D. Lease Certs. of Part.        AAA     7.650         7/01/01 @ 100 S.F.     611,721
                              (Lawrence Cnty. Courthouse Prjt.)                        7/01/2010     7/01/00 @ 102 Ref.
                              (Capital Guaranty)

     7              360,000   Matagorda Cnty. Tx. Navgtion. Dstrct. No. One    AAA     7.500         No Sinking Fund        398,293
                              Adjustable Rate Colltzd. Poll. Cntrl. Rev. Bonds,        12/15/2014    12/15/99 @ 103 Ref.
                              (Central Pwr. & Lt. Co. Prjt.) Series 1984 A
                              (AMBAC)

     8              240,000   Ill. Hsg. Dev. Auth. Multi-Fam. Hsg. Rev.        AAA     0.000                                 13,343
                              Bonds 1983 Series A (MBIA Corp.)                         7/01/2025     None
             --------------
                                                                                                                          ----------


             $    2,860,000   Total Investments (Cost $2,616,480)                                                         $2,917,869
             --------------                                                                                               ----------
             --------------                                                                                               ----------
</TABLE>









   See accompanying footnotes to portfolio and notes to financial statements.

<PAGE>


Insured Municipal Securities Trust, Series 23
Footnotes to Portfolio
- --------------------------------------------------------------------------------

1.       All ratings are by Kenny S&P Evaluation Services, a business unit of
         J.J. Kenny Company, Inc., a subsidiary of The McGraw-Hill Companies,
         Inc. A brief description of the ratings symbols and their meaning is
         set forth under "Description of Bond Ratings" in Part B of the
         Prospectus.

2.       See "The Trust - Portfolio" in Part B of the Prospectus for an
         explanation of redemption features. See "Tax Status" in Part B of the
         Prospectus for a statement of the Federal tax consequences to a
         Certificateholder upon the sale, redemption or maturity of a bond.

3.       At December 31, 1996, the net unrealized appreciation of all the bonds
         was comprised of the following:

             Gross unrealized appreciation                      $  307,576
             Gross unrealized depreciation                          (6,187)
                                                                ----------


             Net unrealized appreciation                        $  301,389
                                                                ----------



4.       The Bonds may also be subject to other calls, which may be permitted or
         required by events which cannot be predicted (such as destruction,
         condemnation, termination of a contract, or receipt of excess or
         unanticipated revenues).











   The accompanying notes form an integral part of the financial statements.

<PAGE>






Insured Municipal Securities Trust, Series 23


Statement of Net Assets
December 31, 1996
- --------------------------------------------------------------------------------

Investments in Securities,
   at Market Value (Cost $2,616,480)                              $    2,917,869
                                                                  --------------

Other Assets
   Accrued Interest                                                       71,027
                                                                  --------------
      Total Other Assets                                                  71,027
                                                                  --------------

Liabilities
   Accrued Expenses                                                        1,108
   Advance from Trustee                                                   15,673
                                                                  --------------
      Total Liabilities                                                   16,781
                                                                  --------------

Excess of Other Assets over Total Liabilities                             54,246
                                                                  --------------

Net Assets (4,221 Units of Fractional Undivided
  Interest Outstanding, $704.13 per Unit)                         $    2,972,115
                                                                  --------------
                                                                  --------------




















   The accompanying notes form an integral part of the financial statements.

<PAGE>

<TABLE>

Insured Municipal Securities Trust, Series 23

Statement of Operations
- --------------------------------------------------------------------------------------------------------------------
<CAPTION>
                                                                       For the Years Ended December 31,
                                                               1996                       1995                  1994

<S>                                                     <C>                        <C>                    <C>
Investment Income
     Interest                                           $   235,416                $   317,120            $  336,456
                                                        -----------                -----------            ----------
Expenses
     Trustee's Fees                                           5,345                      5,210                 5,621
     Evaluator's Fees                                         2,884                      2,250                 2,479
     Sponser's Advisory Fee                                     903                      1,100                 1,142
                                                        -----------                -----------            ----------

         Total Expenses                                       9,132                      8,560                 9,242
                                                        -----------                -----------            ----------

     Net Investment Income                                  226,284                    308,560               327,214
                                                        -----------                -----------            ----------

Realized and Unrealized Gain (Loss)
     Realized Gain (Loss) on
         Investments                                        (13,476)                   (13,012)                2,146

     Change in Unrealized Appreciation
         (Depreciation) on Investments                     (115,877)                   218,430              (391,930)
                                                        -----------                -----------            ----------

     Net Gain (Loss) on Investments                        (129,353)                   205,418              (389,784)
                                                        -----------                -----------            ----------

     Net Increase (Decrease)
         in Net Assets
         Resulting From Operations                     $     96,931                $   513,978           $   (62,570)
                                                        -----------                -----------            ----------
                                                        -----------                -----------            ----------
</TABLE>




















   The accompanying notes form an integral part of the financial statements.

<PAGE>
<TABLE>

Insured Municipal Securities Trust, Series 23

Statement of Changes in Net Assets
- --------------------------------------------------------------------------------
<CAPTION>


                                                                       For the Years Ended December 31,
                                                               1996                       1995                  1994
<S>                                                       <C>                    <C>                   <C>
Operations
Net Investment Income                                     $    226,284           $     308,560         $     327,214
Realized Gain (Loss)
     on Investments                                            (13,476)                (13,012)                2,146
Change in Unrealized Appreciation
     (Depreciation) on Investments                            (115,877)                218,430              (391,930)
                                                          ------------           -------------         -------------

          Net Increase (Decrease) in
                Net Assets Resulting
                From Operations                                 96,931                 513,978               (62,570)
                                                          ------------           -------------         -------------

Distributions to Certificateholders
     Investment Income                                         246,143                 309,708               326,331
     Principal                                               1,083,719                 239,375                93,064

Redemptions
     Interest                                                    6,668                     201                 2,612
     Principal                                                 247,246                  12,571               152,044
                                                          ------------           -------------         -------------

         Total Distributions
             and Redemptions                                 1,583,776                 561,855               574,051
                                                          ------------           -------------         -------------

         Total (Decrease)                                   (1,486,845)                (47,877)             (636,621)

Net Assets
     Beginning of Year                                       4,458,960               4,506,837             5,143,458
                                                          ------------           -------------         -------------

     End of Year (Including
         Undistributed Net Investment
         Income of $59,588, $86,115
         and $87,464, Respectively)                       $  2,972,115            $  4,458,960          $  4,506,837
                                                          ------------           -------------         -------------
                                                          ------------           -------------         -------------
</TABLE>














   The accompanying notes form an integral part of the financial statements.

<PAGE>

Insured Municipal Securities Trust, Series 23

Notes to Financial Statements
- --------------------------------------------------------------------------------
1.       Organization

         Insured Municipal Securities Trust, Series 23 (the "Trust") was
         organized on May 10, 1990 by Bear, Stearns & Co. Inc. and Gruntal &
         Co., Incorporated under the laws of the State of New York by a Trust
         Indenture and Agreement, and is registered under the Investment Company
         Act of 1940. The Trust was formed to preserve capital and to provide
         interest income.

         Effective September 28, 1995, Reich & Tang Distributors L.P. ("Reich &
         Tang") has become the successor sponsor (the "Sponsor") to certain of
         the unit investment trusts previously sponsored by Bear, Stearns & Co.
         Inc. As successor Sponsor, Reich & Tang has assumed all of the
         obligations and rights of Bear, Stearns & Co. Inc., the previous
         sponsor. Effective September 2, 1995, United States Trust Company of
         New York was merged into The Chase Manhattan Bank (the "Trustee").
         Accordingly, Chase is the successor trustee of the Trust.

2.       Summary of Significant Accounting Policies

         The following is a summary of significant accounting policies
         consistently followed by the Trust in preparation of its financial
         statements. The policies are in conformity with generally accepted
         accounting principles ("GAAP"). The preparation of financial statements
         in accordance with GAAP requires management to make estimates and
         assumptions that affect the reported amounts and disclosures in the
         financial statements. Actual amounts could differ from those estimates.

         Interest Income
         Interest income is recorded on the accrual basis. The discount on the
         zero-coupon bonds is accreted by the interest method over the
         respective lives of the bonds. The accretion of such discount is
         included in interest income; however, it is not distributed until
         realized in cash upon maturity or sale of the respective bonds.

         Security Valuation
         Investments are carried at market value which is determined by Kenny
         S&P Evaluation Services, a business unit of J.J. Kenny Company, Inc., a
         subsidiary of The McGraw-Hill Companies, Inc. The market value of the
         portfolio is based upon the bid prices for the bonds at the end of the
         year, which approximates the fair value of the security at that date,
         except that the market value on the date of deposit represents the cost
         to the Trust based on the offering prices for investments at that date.
         The difference between cost (including accumulated accretion of
         original issue discount on zero-coupon bonds) and market value is
         reflected as unrealized appreciation (depreciation) of investments.
         Securities transactions are recorded on the trade date. Realized gains
         (losses) from securities transactions are determined on the basis of
         average cost of the securities sold or redeemed.

<PAGE>

Insured Municipal Securities Trust, Series 23

Notes to Financial Statements
- --------------------------------------------------------------------------------
3.       Income Taxes

         No provision for federal income taxes has been made in the accompanying
         financial statements because the Trust intends to continue to qualify
         for the tax treatment applicable to Grantor Trusts under the Internal
         Revenue Code. Under existing law, if the Trust so qualifies, it will
         not be subject to federal income tax on net income and capital gains
         that are distributed to unitholders.

4.       Trust Administration

         The Trustee has custody of assets and responsibility for the accounting
         records and financial statements of the Trust and is responsible for
         establishing and maintaining a system of internal control related
         thereto. The Trustee is also responsible for all estimates of expenses
         and accruals reflected in the Trust's financial statements.

         The Trust Indenture and Agreement provides for interest distributions
         as often as monthly (depending upon the distribution plan elected by
         the Certificateholders).

         The Trust Indenture and Agreement further requires that principal
         received from the disposition of bonds, other than those bonds sold in
         connection with the redemption of units, be distributed to
         Certificateholders.

         The Trust Indenture and Agreement also requires the Trust to redeem
         units tendered. For the years ended December 31, 1996, 1995 and 1994,
         329, 13 and 153 units were redeemed, respectively.

         The Trust pays an annual fee for trustee services rendered by the
         Trustee that ranges from $.33 to $.97 per $1,000 of outstanding
         investment principal. In addition, a minimum fee of $15.00 is paid to a
         service bureau for each portfolio valuation. A maximum fee of $.25 per
         $1,000 of outstanding investment principal is paid to the Sponsor. For
         the year ended December 31, 1996, the "Trustee's Fees" are comprised of
         Trustee fees of $3,272 and other expenses of $2,073. The other expenses
         include professional, printing and miscellaneous fees.

<PAGE>
Insured Municipal Securities Trust, Series 23

Notes to Financial Statements
- --------------------------------------------------------------------------------
5.       Net Assets

         At December 31, 1996, the net assets of the Trust represented the
         interest of Certificateholders as follows:

               Original cost to Certificateholders           $     5,092,720
               Less Initial Gross Underwriting Commission            249,543
                                                             ---------------
                                                                   4,843,177
               Accumulated Cost of Securities Sold,
                  Matured or Called                               (2,235,351)
               Net Unrealized Appreciation                           301,389
               Undistributed Net Investment Income                    59,588
               Undistributed Proceeds From Investments                 3,312
                                                             ---------------

                  Total                                      $     2,972,115
                                                             ---------------
                                                             ---------------

         The original cost to Certificateholders, less the initial gross
         underwriting commission, represents the aggregate initial public
         offering price net of the applicable sales charge on 5,000 units of
         fractional undivided interest of the Trust as of the date of deposit.

         Undistributed net investment income includes accumulated accretion of
         original issue discount of $8,654.

6.       Concentration of Credit Risk

         Since the Trust invests a portion of its assets in municipal bonds, it
         may be affected by economic and political developments in the
         municipalities. Certain debt obligations held by the Trust may be
         entitled to the benefit of insurance, standby letters of credit or
         other guarantees of banks or other financial institutions.







<PAGE>
Insured Municipal Securities Trust, Series 23

Notes to Financial Statements
- --------------------------------------------------------------------------------
7.       Financial Highlights (per unit)*

         Selected data for a unit of the Trust outstanding for the year ended
         December 31, 1996:

         Net Asset Value, Beginning of Year **          $        979.99
                                                        ---------------

             Interest Income                                      53.67
             Expenses                                             (2.08)
                                                        ---------------
             Net Investment Income                                51.59
                                                        ---------------
             Net Gain or Loss on Investments(1)                  (22.72)
                                                        ---------------

         Total from Investment Operations                         28.87
                                                        ---------------

         Less Distributions
             to Certificateholders
                 Income                                           56.12
                 Principal                                       247.09
             for Redemptions
                 Interest                                          1.52
                                                        ---------------

         Total Distributions                                     304.73
                                                        ---------------

         Net Asset Value, End of Year **                $        704.13
                                                        ---------------
                                                        ---------------

         See "Financial and Statistical Information" in Part A of this
         Prospectus for amounts of per unit distributions during the years ended
         December 31, 1996, 1995 and 1994 based on actual units.



(1)      Net gain or loss on investments is a result of changes in outstanding
         units since January 1, 1996 and the dates of net gain and loss on
         investments.












- --------------------
    *Unless otherwise stated, based upon average units outstanding during the
     year of 4,386 ([4,221 + 4,550]/2).

     **Based upon actual units outstanding.

<PAGE>

   
                     Prospectus Part A Dated April 30, 1997
    


                       INSURED MUNICIPAL SECURITIES TRUST
                           NEW YORK NAVIGATOR INSURED

                                    SERIES 2

- --------------------------------------------------------------------------------

   
                  The Trust is a unit investment trust designated Series 2 ("New
York Navigator Trust") with an underlying portfolio of long-term insured
tax-exempt bonds issued by or on behalf of states, municipalities and public
authorities and was formed to preserve capital and to provide interest income
(including, where applicable, earned original issue discount) which, in the
opinions of bond counsel to the respective issuers, is, with certain exceptions,
currently exempt from regular federal income tax under existing law and from New
York State and City personal income tax. There can be no assurance that the
Trust's investment objectives will be achieved. Although the Supreme Court has
determined that Congress has the authority to subject the interest on bonds such
as the Bonds in the Trust to regular federal income taxation, existing law
excludes such interest from regular federal income tax. Such interest income
may, however, be a specific preference item for purposes of the federal
individual and/or corporate alternative minimum tax. (See "Description of
Portfolio" in this Part A for a list of these Bonds which pay interest income
subject to the federal individual alternative minimum tax.) In addition, capital
gains are subject to tax. (See "Tax Status" and "The Trust--Portfolio" in Part B
of this Prospectus.) The Sponsors are Reich & Tang Distributors L.P. and Gruntal
& Co., L.L.C. (sometimes referred to as the "Sponsor" or the "Sponsors"). The
value of the Units of the Trust will fluctuate with the value of the underlying
bonds. Minimum purchase: 1 Unit.

                  This Prospectus consists of two parts. Part A contains the
Summary of Essential Information as of December 31, 1996 (the "Evaluation
Date"), a summary of certain specific information regarding the Trust and
audited financial statements of the Trust, including the related portfolio, as
of the Evaluation Date. Part B of this Prospectus contains a general summary of
the Trust. Part A of this Prospectus may not be distributed unless accompanied
by Part B. Investors should retain both parts of this Prospectus for future
reference.
    


         THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
         SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
         NOR HAS THE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON
         THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
         CONTRARY IS A CRIMINAL OFFENSE.

- --------------------------------------------------------------------------------

   
                  THE TRUST. The Trust seeks to achieve its investment
objectives through investment in a fixed, diversified portfolio of long-term
insured bonds (the "Bonds") issued by or on behalf of states, municipalities and
public authorities which, because of irrevocable insurance, were rated "AAA" by
Standard & Poor's Corporation. All of the Bonds in the Trust were rated "AAA" by
Standard & Poor's Corporation at the time originally deposited in the Trust (see
"Portfolio"). This rating results from insurance relating only to the Bonds in
the Trust and not to Units of the Trust. The insurance does not remove market
risk, as it does not guarantee the market value of the Units. For a discussion
of the significance of such ratings, see "Description of Bond Ratings" in Part B
of this Prospectus.
    


109751.1

<PAGE>



   
                  Some of the aggregate principal amount of the Bonds in the
Trust may be "Zero Coupon Bonds," which are original issue discount bonds that
provide for payment at maturity at par value, but do not provide for the payment
of current interest (for the amount of Zero Coupon Bonds in each Trust, and the
cost of such Bonds to that Trust, see "Description of Portfolio" in this Part
A). The payment of interest and preservation of capital are, of course,
dependent upon the continuing ability of the issuers of the Bonds or the insurer
thereof to meet their obligations.

                  Investment in the Trust should be made with an understanding
of the risks which an investment in long-term fixed rate debt obligations may
entail, including the risk that the value of the underlying portfolio will
decline with increases in interest rates, and that the value of Zero Coupon
Bonds is subject to greater fluctuation than coupon bonds in response to such
changes in interest rates. A Trust designated as a long-term trust must have a
dollar-weighted average portfolio maturity of more than ten years.

                  Each Unit in the Trust represents a 1/5105th undivided
interest in the principal and net income of the Trust. The principal amount of
Bonds deposited in the Trust per Unit is reflected in the Summary of Essential
Information. (See "Organization" in Part B of this Prospectus.) The Units being
offered hereby are issued and outstanding Units which have been purchased by the
Sponsors in the secondary market.

                  INSURANCE. Each of the Bonds in the New York Navigator Trust
is insured by a municipal bond guaranty insurance policy obtained by the
Sponsors (the "Navigator Sponsor-Insured Bonds") from MBIA Insurance Corporation
("MBIA Corp.") covering regularly scheduled payments of principal thereof and
interest thereon when such amounts become due for payment but shall not have
been paid. For discussion of the effect of an occurrence of non-payment of
principal or interest on any Bonds in the New York Navigator Trust see
"Portfolio Supervision" in Part B of this Prospectus. The premiums for the
Navigator Sponsor-Insured Bonds are obligations of the Sponsors. Additionally,
some of the Bonds in the New York Navigator Trust may be PreInsured Bonds (as
described below). The premium for the Pre-Insured Bonds is an obligation of the
issuers, underwriters or prior owners of those Bonds. The insurance policy or
policies relating to the Navigator Sponsor-Insured Bonds provides that, to the
extent that Bonds are both Pre-Insured Bonds and Navigator Sponsor-Insured
Bonds, coverage is effective after a claim has been made upon the insurer of the
Pre-Insured Bonds.

                  Some of the Bonds in the New York Navigator Trust may
additionally be insured by a municipal bond guaranty insurance policy obtained
by issuers, underwriters or prior owners of the Bonds ("Pre-Insured Bonds") and
issued by one of the insurance companies described under "Insurance on the
Bonds" in Part B of this Prospectus (the "Insurance Companies").

                  None of the insurance will cover accelerated payments of
principal or penalty interest or premiums unrelated to taxability of interest on
the Bonds. The insurance relates only to the prompt payment of principal of and
interest on the securities in the portfolios, and does not remove market risks
nor does it guarantee the market value of Units in the Trusts. The terms of he
insurance are more fully described herein. No representation is made herein as
to any Bond insurer's ability to meet its obligations under a policy of
insurance relating to any of the Pre-Insured Bonds. In addition, investors
should be aware that subsequent to the Date of Deposit the rating of the
claims-paying ability of the insurer of an underlying Pre-Insured Bond may be
downgraded.

                 All of the Bonds in the New York Navigator Trust are covered by
insurance obtained by the Sponsors from MBIA Corp. and 17.4% of the Bonds in
    

                                                      A-2

109751.1

<PAGE>



   
the New York Navigator Trust are Pre-Insured Bonds.  The approximate
percentage of the aggregate principal amount of the Portfolio that is insured
by each Insurance Company with respect to Pre-Insured Bonds is as follows:
Capital Guaranty Insurance Company ("Capital Guaranty"), 17.4%.

                  PUBLIC OFFERING PRICE. The secondary market Public Offering
Price of each Unit is equal to the aggregate offering price of the Bonds in such
Trust divided by the number of Units outstanding, plus a sales charge of 3.8% of
the Public Offering Price, or 4.001% of the net amount invested in Bonds per
Unit. In addition, accrued interest to the expected date of settlement is added
to the Public Offering Price. If Units had been purchased on the Evaluation
Date, the Public Offering Price per Unit would have been $1,053.20 plus accrued
interest of $11.12 under the monthly distribution plan, $16.79 under the
semi-annual distribution plan and $16.79 under the annual distribution plan, for
a total of $1,064.32, $1,069.99 and $1,069.99, respectively. The Public Offering
Price per Unit can vary on a daily basis in accordance with fluctuations in the
aggregate bid price of the Bonds. (See "Public Offering--Offering Price" in Part
B of this Prospectus.)

                  ESTIMATED LONG TERM RETURN AND ESTIMATED CURRENT RETURN. Units
of each Trust are offered to investors on a "dollar price" basis (using the
computation method described under "Public Offering--Offering Price" in Part B)
as distinguished from a "yield price" basis often used in offerings of tax
exempt bonds (involving the lesser of the yield as computed to maturity of bonds
or to an earlier redemption date). Since they are offered on a dollar price
basis, the rate of return on an investment in Units of each Trust is measured in
terms of "Estimated Current Return" and "Estimated Long Term Return".
    

                  Estimated Long Term Return is calculated by: (1) computing the
yield to maturity or to an earlier call date (whichever results in a lower
yield) for each Bond in the Trust's portfolio in accordance with accepted bond
practices, which practices take into account not only the interest payable on
the Bond but also the amortization of premiums or accretion of discounts, if
any; (2) calculating the average of the yields for the Bonds in the Trust's
portfolio by weighing each Bond's yield by the market value of the Bond and by
the amount of time remaining to the date to which the Bond is priced (thus
creating an average yield for the portfolio of the Trust); and (3) reducing the
average yield for the portfolio of the Trust in order to reflect estimated fees
and expenses of the Trust and the maximum sales charge paid by investors. The
resulting Estimated Long Term Return represents a measure of the return to
investors earned over the estimated life of the Trust. (For the Estimated Long
Term Return to Certificateholders under the monthly, semi-annual and annual
distribution plans, see "Summary of Essential Information".)

                  Estimated Current Return is a measure of the Trust's cash
flow. Estimated Current Return is computed by dividing the Estimated Net Annual
Interest Income per Unit by the Public Offering Price per Unit. In contrast to
the Estimated Long Term Return, the Estimated Current Return does not take into
account the amortization of premium or accretion of discount, if any, on the
Bonds in the portfolio of the Trust. Moreover, because interest rates on Bonds
purchased at a premium are generally higher than current interest rates on newly
issued bonds of a similar type with comparable rating, the Estimated Current
Return per Unit may be affected adversely if such Bonds are redeemed prior to
their maturity.

                  The Estimated Net Annual Interest Income per Unit of the Trust
will vary with changes in the fees and expenses of the Trustee and the Evaluator
applicable to the Trust and with the redemption, maturity, sale or other
disposition of the Bonds in the Trust. The Public Offering Price will vary with
changes in the bid prices of the Bonds. Therefore, there is no

                                                      A-3

109751.1

<PAGE>



assurance that the present Estimated Current Return or Estimated Long Term
Return will be realized in the future. (For the Estimated Current Return to
Certificateholders under the monthly, semi-annual and annual distribution plans,
see "Summary of Essential Information". See "Estimated Long Term Return and
Estimated Current Return" in Part B of this Prospectus.)

                  A schedule of cash flow projections is available from the
Sponsors upon request.

                  DISTRIBUTIONS. Distributions of interest income, less
expenses, will be made by the Trust either monthly, semi-annually or annually
depending upon the plan chosen by the Certificateholder. Certificateholders
purchasing Units in the secondary market will initially receive distributions in
accordance with the elections of the prior owner and may thereafter change the
plan as provided under "Interest and Principal Distributions" in Part B of this
Prospectus. Distributions of principal, if any, will be made semi-annually on
June 15 and December 15 of each year. (See "Rights of
Certificateholders--Interest and Principal Distributions" in Part B of this
Prospectus. For estimated monthly, semi-annual and annual interest
distributions, see "Summary of Essential Information.")

   
                  MARKET FOR UNITS. The Sponsors, although not obligated to do
so, presently maintain and intend to continue to maintain a secondary market for
the Units at a price based on the aggregate bid price of the Bonds in the Trust
portfolio. The reoffer price will be based on the aggregate bid price of the
Bonds plus a sales charge of 3.8% of the Public Offering Price (4.001% of the
net amount invested), plus net accrued interest. If a market is not maintained a
Certificateholder will be able to redeem his or her Units with the Trustee at a
price based on the aggregate bid price of the Bonds. (See "Sponsor Repurchase"
and "Public Offering--Offering Price" in Part B of this Prospectus.)
    

                  TOTAL REINVESTMENT PLAN. Certificateholders under the
semi-annual and annual plans of distribution have the opportunity to have all
their regular interest distributions, and principal distributions, if any,
reinvested in available series of "Insured Municipal Securities Trust" or
"Municipal Securities Trust." (See "Total Reinvestment Plan" in Part B of this
Prospectus. Residents of Texas see "Total Reinvestment Plan for Texas Residents"
in Part B of this Prospectus.) The Plan is not designed to be a complete
investment program.

                                                      A-4

109751.1

<PAGE>



                       INSURED MUNICIPAL SECURITIES TRUST
                           NEW YORK NAVIGATOR INSURED
                                    SERIES 2

            SUMMARY OF ESSENTIAL INFORMATION AS OF DECEMBER 31, 1996

<TABLE>
<CAPTION>

   
Date of Deposit:  May 10, 1990                                    Weighted Average Life to
- ---------------                                                   ------------------------
<S>                                          <C>                                <C>        
Principal Amount of Bonds ...                $4,890,000              Maturity:  14.0 Years.
- -------------------------                                            --------
Number of Units .............                5,105                Minimum Value of Trust:
- ---------------                                                   ----------------------
Fractional Undivided Inter-                                          Trust may be terminated if
- --------------------------
  est in Trust per Unit .....                1/5105                  value of Trust is less than
  ---------------------
Principal Amount of                                                  $2,400,000 in principal amount
- -------------------
  Bonds per Unit ............                $957.88                 of Bonds.
  --------------
Secondary Market Public                                           Mandatory Termination Date:
- -----------------------                                           --------------------------
  Offering Price**                                                   The earlier of December 31,
  Aggregate Bid Price                                                2039 or the disposition of the
    of Bonds in Trust .......                $5,169,710+++           last Bond in the Trust.
  Divided by 5,105 Units ....                $1,012.68            Trustee***:  The Chase Manhattan
                                                                  -------
  Plus Sales Charge of 3.8%                                          Bank.
    of Public Offering Price.                $40.52               Trustee's Annual Fee:  Monthly
  Public Offering Price                                              plan $1.00 per $1,000; semi-
    per Unit ................                $1,053.20+              annual plan $.54 per $1,000;
Redemption and Sponsors'                                             and annual plan is $.36 per
- ------------------------
  Repurchase Price                                                   $1,000.
  per Unit ..................                $1,012.68+           Evaluator:  Kenny S&P Evaluation
  --------                                                        ---------
                                        +++                          Services.
                                        ++++                      Evaluator's Fee for Each
Excess of Secondary Market                                           Evaluation:  Minimum of $15
- --------------------------                                           ----------
  Public Offering Price                                              plus $.25 per each issue of
  ---------------------
  over Redemption and                                                Bonds in excess of 50 issues
  -------------------
  Sponsors' Repurchase                                               (treating separate maturities
  --------------------
  Price per Unit ............                $40.52++++              as separate issues).
  --------------
Difference between Public                                         Sponsors:  Reich & Tang
- -------------------------                                         --------
  Offering Price per Unit                                            Distributors L.P. and Gruntal
  -----------------------
  and Principal Amount per                                           & Co., L.L.C.
  ------------------------
  Unit Premium/(Discount) ...                $95.32               Sponsors' Annual Fee:  Maximum
  -----------------------                                         --------------------
    

Evaluation Time:  4:00 p.m.                                          of $.25 per $1,000 principal
  New York Time.                                                     amount of Bonds (see "Trust
Minimum Principal Distribution:                                      Expenses and Charges" in
  $1.00 per Unit.                                                    Part B of this Prospectus).

</TABLE>



       PER UNIT INFORMATION BASED UPON INTEREST DISTRIBUTION PLAN ELECTED
<TABLE>
<CAPTION>

                                                             Monthly          Semi-Annual            Annual
                                                             Option             Option               Option

<S>                                                            <C>                  <C>                  <C>   
   
Gross annual interest income# .........                        $69.11               $69.11               $69.11
Less estimated annual fees and
  expenses ............................                          1.99                 1.49                 1.50
Estimated net annual interest                                  ______               ______               ______
  income (cash)# ......................                        $67.12               $67.62               $67.61
Estimated interest distribution# ......                          5.59                33.81                67.61
Estimated daily interest accrual# .....                         .1864                .1878                .1878
Estimated current return#++ ...........                         6.37%                6.42%                6.42%
Estimated long term return++ ..........                         3.92%                3.97%                3.97%
    
Record dates ..........................                      1st of           Dec. 1 and             Dec. 1
                                                             each month       June 1
Interest distribution dates ...........                      15th of          Dec. 15 and            Dec. 15
                                                             each month       June 15
</TABLE>

                                                      A-5

109751.1

<PAGE>



                                   Footnotes to Summary of Essential Information

   *    The Date of Deposit is the date on which the Trust Agreement was signed
        and the deposit of the Bonds with the Trustee made.

   
  **    For information regarding offering price per Unit and applicable sales
        charge under the Total Reinvestment Plan, see "Total Reinvestment Plan"
        in Part B of this Prospectus.

 ***    The Trustee maintains its principal executive office at 270 Park
        Avenue, New York, New York 10017 and its unit investment trust office
        at 4 New York Plaza, New York, New York 10004 (tel. no.:
        1-800-882-9898). For information regarding redemption by the Trustee,
        see "Trustee Redemption" in Part B of this Prospectus.

   +    Plus accrued interest to the expected date of settlement (approximately
        three business days after purchase) of $11.12 monthly, $16.79
        semi-annually and $16.79 annually.
    

  ++    The estimated current return and estimated long term return are
        increased for transactions entitled to a discount (see "Employee
        Discounts" in Part B of this Prospectus), and are higher under the
        semi-annual and annual options due to lower Trustee's fees and
        expenses.

 +++    Based solely upon the bid side evaluation of the underlying Bonds
        (including, where applicable, undistributed cash from the principal
        account). Upon tender for redemption, the price to be paid will be
        calculated as described under "Trustee Redemption" in Part B of this
        Prospectus.

++++    See "Comparison of Public Offering Price, Sponsor's Repurchase Price and
        Redemption Price" in Part B of this Prospectus.

   #    Does not include income accrual from original issue discount bonds, if
        any.

   
                                       FINANCIAL AND STATISTICAL INFORMATION

Selected data for each Unit outstanding for the periods listed below:
    

<TABLE>
<CAPTION>
   
                                                                                                    Distribu-
                                                                                                    tions of
                                                           Distributions of Interest                Principal
                                                          During the Period (per Unit)               During
                                         Net Asset*                       Semi-                       the
                         Units Out-        Value          Monthly         Annual          Annual     Period
Period Ended              standing        Per Unit        Option          Option          Option    (Per Unit)
- ------------             ----------      ----------       -------         ------          ------    ----------

<S>                             <C>         <C>             <C>             <C>              <C>              <C>
December 31, 1994               5,685       $1,050.92       $71.45          $72.13           $72.33          -0-
December 31, 1995               5,639        1,095.23        72.50           73.15            73.27          -0-
December 31, 1996               5,105        1,028.44        69.78           70.32            70.26       $38.46

- --------
*        Net Asset Value per Unit is calculated by dividing net assets as
         disclosed in the "Statement of Net Assets" by the number of Units
         outstanding as of the date of the Statement of Net Assets. See Note 5
         of Notes to Financial Statements for a description of the components of
         Net Assets.
    
</TABLE>

                                                      A-6

109751.1

<PAGE>



   
                                          INFORMATION REGARDING THE TRUST
                                              AS OF DECEMBER 31, 1996


DESCRIPTION OF PORTFOLIO

                  The portfolio of the Trust consists of 11 issues representing
obligations of 8 issuers located in the state of New York. The Sponsors have not
participated as a sole underwriter or manager, co-manager or member of an
underwriting syndicate from which any of the initial aggregate principal amount
of the Bonds were acquired. None of the Bonds are obligations of state and local
housing authorities; approximately 26.5% are hospital revenue bonds+; none were
issued in connection with the financing of nuclear generating facilities; and
none are "mortgage subsidy" bonds. All of the Bonds in the Trust are subject to
redemption prior to their stated maturity dates pursuant to sinking fund or
optional call provisions. The Bonds may also be subject to other calls, which
may be permitted or required by events which cannot be predicted (such as
destruction, condemnation, termination of a contract, or receipt of excess or
unanticipated revenues). Two of the issues representing $635,000 of the
principal amount of the Bonds are general obligation bonds. All 9 of the
remaining issues representing $4,255,000 of the principal amount of the Bonds
are payable from the income of a specific project or authority and are not
supported by the issuer's power to levy taxes. The portfolio is divided for
purpose of issue as follows: Commuter Facility 1, Correctional Facilities 1,
Hospital 2, Special Obligations 2, University 1, Water 1, and Water and Sewer 1.
For an explanation of the significance of these factors see "The
Trust--Portfolio" in Part B of this Prospectus.

                  As of December 31, 1996, $2,010,000 (approximately 41.1% of
the aggregate principal amount of the Bonds) were original issue discount bonds.
Of these original issue discount bonds, none were Zero Coupon Bonds. None of the
aggregate principal amount of the Bonds in the Trust were purchased at a
"market" discount from par value at maturity, approximately 58.9% were purchased
at a premium and none were purchased at par. For an explanation of the
significance of these factors see "Discount and Zero Coupon Bonds" in Part B of
this Prospectus. All of the Bonds are subject to redemption prior to maturity
pursuant to sinking fund or call provisions.

                  None of the Bonds in the Trust are subject to the federal
individual alternative minimum tax under the Tax Reform Act of 1986.  See "Tax
Status" in Part B of this Prospectus.

- --------
+        A trust is considered to be "concentrated" in a particular category or
         industry when the securities in that category or industry constitute
         25% or more of the aggregate face amount of the portfolio. See Part B
         for disclosure, including risk factors, regarding this concentration.
    

                                                      A-7

109751.1

<PAGE>

                        Report of Independent Accountants


To the Sponsor, Trustee and Certificateholders of
Insured Municipal Securities Trust, New York Navigator
Insured Series 2

In our opinion, the accompanying statement of net assets, including the
portfolio of investments, and the related statements of operations and of
changes in net assets and the financial highlights present fairly, in all
material respects, the financial position of Insured Municipal Securities Trust,
New York Navigator Insured Series 2 (the "Trust") at December 31, 1996, the
results of its operations, the changes in its net assets and the financial
highlights for the year then ended, in conformity with generally accepted
accounting principles. These financial statements and financial highlights
(hereafter referred to as "financial statements") are the responsibility of the
Trust's management; our responsibility is to express an opinion on these
financial statements based on our audit. We conducted our audit of these
financial statements in accordance with generally accepted auditing standards
which require that we plan and perform the audit to obtain reasonable assurance
about whether the financial statements are free of material misstatement. An
audit includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements, assessing the accounting principles
used and significant estimates made by management, and evaluating the overall
financial statement presentation. We believe that our audit, which included
confirmation of securities at December 31, 1996 by correspondence with the
Trustee, provides a reasonable basis for the opinion expressed above. The
financial statements for the prior periods presented were audited by other
independent accountants whose report dated March 31, 1996 expressed an
unqualified opinion on those financial statements.




PRICE WATERHOUSE LLP
160 Federal Street
Boston, MA 02110
March 28, 1997


<PAGE>

<TABLE>

Insured Municipal Securities Trust,
New York Navigator Insured Series 2
Portfolio
December 31, 1996
- -----------------------------------------------------------------------------------------------------------------------------
<CAPTION>
                                                                                                                             
                   Aggregate                                                                                   Coupon Rate/  
  Portfolio        Principal          Name of Issuer and                                     Ratings            Date(s) of   
     No.            Amount              Title of Bonds                                         (1)             Maturity (2)  
<S>            <C>                 <C>                                                       <C>              <C>            

     1         $      600,000      N.Y. State Dorm. Auth. State Univ. Ed. Facs.                AAA            7.700%         
                                   Rev. Bonds Series 1990 A (MBIA Corp.)                                      5/15/2012      

     2                190,000      N.Y. State Med. Care Facs. Finc. Agncy.                     AAA            7.875          
                                   Mental Hlth. Servs. Facs. Imprvmnt. Rev.                                   8/15/2015      
                                   Bonds 1988 Series B (Capital Guaranty)

    2a                410,000      N.Y. State Med. Care Facs. Finc. Agncy. Mental              AAA            7.875          
                                   Hlth. Servs. Facs. Imprvmnt. Rev. Bonds 1988                               8/15/2015      
                                   Series B (Capital Guaranty)

     3                695,000      N.Y. State Med. Care Facs. Finc. Agncy. Hosp. &             AAA            8.000          
                                   Nrsg. Home Insrd. Mtg. Rev. Bonds Series 1988 A                            2/15/2028      
                                   (MBIA Corp.)

     4                500,000      N.Y. State Urban Dev. Corp. Correc. Facs. Rev.              AAA            6.000          
                                   Bonds Series G (MBIA Corp.)                                                1/01/2019      

     5                600,000      N.Y. City Gen. Oblig. Rev. Bonds Fiscal 1989                AAA            6.500          
                                   Series C (MBIA Corp.)                                                      8/15/2018      

     6                 35,000      N.Y. City Gen. Oblig. Rev. Bonds Fiscal 1987                AAA            8.500          
                                   Series D (MBIA Corp.)                                                      8/01/2008      

     7                160,000      N.Y. City Muni. Wtr. Finc. Auth. Wtr. & Swr.                AAA            5.000%         
                                   Sys. Rev. Bonds Fiscal 1987 Series A                                       6/15/2017      
                                   (MBIA Corp.)

     8                500,000      N.Y. City Muni. Wtr. Finc. Auth. Wtr. & Swr.                AAA            6.000          
                                   Sys. Rev. Bonds Fiscal 1990 Series A                                       6/15/2019      
                                   (MBIA Corp.)

     9                500,000      Metro. Trans. Auth. N.Y. Comm. Facs. 1987                   AAA            8.000          
                                   Serv. Cntrct. Bonds Series 2 (MBIA Corp.)                                  7/01/2018      

    10                250,000      Triborough Bridge & Tunnel Auth. N.Y. Mtg.                  AAA            7.125          
                                   Recording Tax Spec. Oblig. Bonds Series 1989 A                             1/01/2019      
                                   (Capital Guaranty)

    11                450,000      Triborough Bridge & Tunnel Auth. N.Y. Mtg.                  AAA            8.000          
                                   Recording Tax Spec. Oblig. Bonds Series 1988 A                             1/01/2018      
                                   (MBIA Corp.)
               --------------

               $    4,890,000      Total Investments (Cost $4,631,276)
               --------------
               --------------
</TABLE>



                      Redemption
                    Feature (2)(4)
  Portfolio        S.F.-Sinking Fund            Market
     No.            Ref.-Refunding             Value (3)

     1          5/15/06 @ 100 S.F.        $          674,562
                5/15/00 @ 102 Ref.

     2          8/15/11 @ 100 S.F.                   203,910
                8/15/98 @ 102 Ref.
               

    2a          8/15/11 @ 100 S.F.                   443,222
                8/15/98 @ 102 Ref.
               

     3          No Sinking Fund                      747,229
                8/15/98 @ 102 Ref.
               

     4          1/01/18 @ 100 S.F.                   506,415
                1/01/00 @ 100 Ref.

     5          No Sinking Fund                      608,724
                8/15/97 @ 100 Ref.

     6          No Sinking Fund                       36,425
                8/01/97 @ 102 Ref.

     7          6/15/15 @ 100 S.F.                   148,026
                1/31/97 @ 100 Ref.
               

     8          6/15/17 @ 100 S.F                    505,310
                6/15/99 @ 100 Ref.
               

     9          7/01/09 @ 100 S.F.                   539,560
                7/01/98 @ 102 Ref.

    10          Currently @ 100 S.F.                 272,470
                1/01/00 @ 101 Ref.
               

    11          1/01/09 @ 100 S.F.                   475,650
                1/01/98 @ 101.5 Ref.


                                          ------------------

                                          $        5,161,503
                                          ------------------
                                          ------------------


   See accompanying footnotes to portfolio and notes to financial statements.

<PAGE>


Insured Municipal Securities Trust,
New York Navigator Insured Series 2
Footnotes to Portfolio
- --------------------------------------------------------------------------------

1.       All ratings are by Kenny S&P Evaluation Services, a business unit of
         J.J. Kenny Company, Inc., a subsidiary of The McGraw-Hill Companies,
         Inc. A brief description of the ratings symbols and their meaning is
         set forth under "Description of Bond Ratings" in Part B of the
         Prospectus.

2.       See "The Trust - Portfolio" in Part B of the Prospectus for an
         explanation of redemption features. See "Tax Status" in Part B of the
         Prospectus for a statement of the Federal tax consequences to a
         Certificateholder upon the sale, redemption or maturity of a bond.

3.       At December 31, 1996, the net unrealized appreciation of all the bonds
         was comprised of the following:

               Gross unrealized appreciation                   $530,227
               Gross unrealized depreciation                       -
                                                               -----------------


               Net unrealized appreciation                     $530,227
                                                               -----------------
                                                               -----------------


4.       The Bonds may also be subject to other calls, which may be permitted or
         required by events which cannot be predicted (such as destruction,
         condemnation, termination of a contract, or receipt of excess or
         unanticipated revenues).



   The accompanying notes form an integral part of the financial statements.

<PAGE>






Insured Municipal Securities Trust,

New York Navigator Insured Series 2
Statement of Net Assets
December 31, 1996
- --------------------------------------------------------------------------------

Investments in Securities,
     at Market Value (Cost $4,631,276)                    $5,161,503
                                                          ----------

Other Assets
     Accrued Interest                                        124,325
                                                          ----------
        Total Other Assets                                   124,325
                                                          ----------

Liabilities
     Accrued Expenses                                          1,572
     Advance from Trustee                                     34,056
                                                          ----------
        Total Liabilities                                     35,628
                                                          ----------

Excess of Other Assets over Total Liabilities                 88,697
                                                          ----------

Net Assets (5,105 Units of Fractional Undivided
     Interest Outstanding, $1,028.44 per Unit)            $5,250,200
                                                          ----------
                                                          ----------

   The accompanying notes form an integral part of the financial statements.



<PAGE>

<TABLE>
Insured Municipal Securities Trust,
New York Navigator Insured Series 2
Statement of Operations
- --------------------------------------------------------------------------------
<CAPTION>

                                                                           For the Years Ended December 31,
                                                               1996                       1995                  1994
<S>                                                     <C>                        <C>                    <C>

Investment Income
     Interest                                           $   381,111                $   417,838            $  425,144
                                                        -----------                -----------            ----------

Expenses
     Trustee's Fees                                           6,608                      6,311                 6,474
     Evaluator's Fees                                         2,191                      2,182                 2,206
     Sponsers Advisory Fee                                    1,399                      1,424                 1,499
                                                        -----------                -----------            ----------

         Total Expenses                                      10,198                      9,917                10,179
                                                        -----------                -----------            ----------

     Net Investment Income                                  370,913                    407,921               414,965
                                                        -----------                -----------            ----------

Realized and Unrealized Gain (Loss)
     Realized Gain (Loss) on
         Investments                                         (3,652)                      ----                23,772

     Change in Unrealized Appreciation
         (Depreciation) on Investments                     (146,463)                   257,584              (582,904)
                                                        -----------                -----------            ----------

     Net Gain (Loss) on Investments                        (150,115)                   257,584              (559,132)
                                                        -----------                -----------            ----------

     Net Increase (Decrease)
         in Net Assets
         Resulting From Operations                      $   220,798                $   665,505            $ (144,167)
                                                        -----------                -----------            ----------
                                                        -----------                -----------            ----------
</TABLE>


   The accompanying notes form an integral part of the financial statements.



<PAGE>


<TABLE>

Insured Municipal Securities Trust,
New York Navigator Insured Series 2
Statement of Changes in Net Assets
- --------------------------------------------------------------------------------
<CAPTION>
                                                                          For the Years Ended December 31,
                                                                  1996                    1995                  1994
<S>                                                      <C>                     <C>                   <C>

Operations
Net Investment Income                                    $     370,913           $     407,921         $     414,965
Realized Gain (Loss)
     on Investments                                             (3,652)                   ----                23,772
Change in Unrealized Appreciation
     (Depreciation) on Investments                            (146,463)                257,584              (582,904)
                                                          ------------           -------------         -------------

          Net Increase (Decrease) in
                Net Assets Resulting
                From Operations                                220,798                 665,505              (144,167)
                                                          ------------           -------------         -------------

Distributions to Certificateholders
     Investment Income                                         371,528                 413,738               412,818
     Principal                                                 202,038                    ----                  ----

Redemptions
     Interest                                                   12,153                     721                 7,158
     Principal                                                 560,900                  49,480               321,453
                                                          ------------           -------------         -------------

         Total Distributions
             and Redemptions                                 1,146,619                 463,939               741,429
                                                          ------------           -------------         -------------

         Total Increase (Decrease)                            (925,821)                201,566              (885,596)

Net Assets
     Beginning of Year                                       6,176,021               5,974,455             6,860,051
                                                          ------------           -------------         -------------

     End of Year (Including
         Undistributed Net Investment
         Income of $80,489, $93,257
         and $99,795, Respectively)                       $  5,250,200            $  6,176,021          $  5,974,455
                                                          ------------           -------------         -------------
                                                          ------------           -------------         -------------
</TABLE>




   The accompanying notes form an integral part of the financial statements.



<PAGE>



Insured Municipal Securities Trust,
New York Navigator Insured Series 2
Notes to Financial Statements
- --------------------------------------------------------------------------------
1.       Organization

         Insured Municipal Securities Trust, New York Navigator Insured Series 2
         (the "Trust") was organized on May 10, 1990 by Bear, Stearns & Co. Inc.
         and Gruntal & Co., Incorporated under the laws of the State of New York
         by a Trust Indenture and Agreement, and is registered under the
         Investment Company Act of 1940. The Trust was formed to preserve
         capital and to provide interest income.

         Effective September 28, 1995, Reich & Tang Distributors L.P. ("Reich &
         Tang") has become the successor sponsor (the "Sponsor") to certain of
         the unit investment trusts previously sponsored by Bear, Stearns & Co.
         Inc. As successor Sponsor, Reich & Tang has assumed all of the
         obligations and rights of Bear, Stearns & Co. Inc., the previous
         sponsor. Effective September 2, 1995, United States Trust Company of
         New York was merged into The Chase Manhattan Bank (the Trustee).
         Accordingly, Chase is the successor trustee of the Trust.

2.       Summary of Significant Accounting Policies

         The following is a summary of significant accounting policies
         consistently followed by the Trust in preparation of its financial
         statements. The policies are in conformity with generally accepted
         accounting principles ("GAAP"). The preparation of financial statements
         in accordance with GAAP requires management to make estimates and
         assumptions that affect the reported amounts and disclosures in the
         financial statements. Actual amounts could differ from those estimates.
         Interest income is recorded on the accrual basis.

         Security Valuation
         Investments are carried at market value which is determined by Kenny
         S&P Evaluation Services, a business unit of J.J. Kenny Company, Inc., a
         subsidiary of The McGraw-Hill Companies, Inc. The market value of the
         portfolio is based upon the bid prices for the bonds at the end of the
         year, which approximates the fair value of the security at that date,
         except that the market value on the date of deposit represents the cost
         to the Trust based on the offering prices for investments at that date.
         The difference between cost and market value is reflected as unrealized
         appreciation (depreciation) of investments. Securities transactions are
         recorded on the trade date. Realized gains (losses) from securities
         transactions are determined on the basis of average cost of the
         securities sold or redeemed.


<PAGE>



Insured Municipal Securities Trust,
New York Navigator Insured Series 2
Notes to Financial Statements
- --------------------------------------------------------------------------------
3.       Income Taxes

         No provision for federal income taxes has been made in the accompanying
         financial statements because the Trust intends to continue to qualify
         for the tax treatment applicable to Grantor Trusts under the Internal
         Revenue Code. Under existing law, if the Trust so qualifies, it will
         not be subject to federal income tax on net income and capital gains
         that are distributed to unitholders.

4.       Trust Administration

         The Trustee has custody of assets and responsibility for the accounting
         records and financial statements of the Trust and is responsible for
         establishing and maintaining a system of internal control related
         thereto. The Trustee is also responsible for all estimates of expenses
         and accruals reflected in the Trust's financial statements.

         The Trust Indenture and Agreement provides for interest distributions
         as often as monthly (depending upon the distribution plan elected by
         the Certificateholders).

         The Trust Indenture and Agreement further requires that principal
         received from the disposition of bonds, other than those bonds sold in
         connection with the redemption of units, be distributed to
         Certificateholders.

         The Trust Indenture and Agreement also requires the Trust to redeem
         units tendered. For the years ended December 31, 1996, 1995 and 1994,
         534, 46 and 301 units were redeemed, respectively.

         The Trust pays an annual fee for trustee services rendered by the
         Trustee that ranges from $.36 to $1.00 per $1,000 of outstanding
         investment principal. In addition, a minimum fee of $15.00 is paid to a
         service bureau for each portfolio valuation. A maximum fee of $.25 per
         $1,000 of outstanding investment principal is paid to the Sponsor. For
         the year ended December 31, 1996, the "Trustee's Fees" are comprised of
         Trustee fees of $4,564 and other expenses of $2,044. The other expenses
         include professional, printing and miscellaneous fees.


<PAGE>



Insured Municipal Securities Trust,
New York Navigator Insured Series 2
Notes to Financial Statements
- --------------------------------------------------------------------------------
5.       Net Assets

         At December 31, 1996, the net assets of the Trust represented the
         interest of Certificateholders as follows:

         Original cost to Certificateholders             $     6,065,183
         Less Initial Gross Underwriting Commission              297,194
                                                         ---------------
                                                               5,767,989
         Accumulated Cost of Securities Sold,
            Matured or Called                                (1,136,713)
         Net Unrealized Appreciation                             530,227
         Undistributed Net Investment Income                      80,489
         Undistributed Proceeds From Investments                   8,208
                                                         ---------------
     
            Total                                        $     5,250,200
                                                         ---------------
                                                         ---------------

         The original cost to Certificateholders, less the initial gross
         underwriting commission, represents the aggregate initial public
         offering price net of the applicable sales charge on 6,000 units of
         fractional undivided interest of the Trust as of the date of deposit.

6.       Concentration of Credit Risk

         Since the Trust invests a portion of its assets in municipal bonds, it
         may be affected by economic and political developments in the
         municipalities. Certain debt obligations held by the Trust may be
         entitled to the benefit of insurance, standby letters of credit or
         other guarantees of banks or other financial institutions.



<PAGE>



Insured Municipal Securities Trust,
New York Navigator Insured Series 2
Notes to Financial Statements
- --------------------------------------------------------------------------------
7.       Financial Highlights (per unit)*

         Selected data for a unit of the Trust outstanding for the year ended
         December 31, 1996:

         Net Asset Value, Beginning of Year**      $     1,095.23
                                                   --------------

             Interest Income                                70.94
             Expenses                                       (1.90)
                                                   --------------
             Net Investment Income                          69.04
                                                   --------------
             Net Gain or Loss on Investments(1)            (26.80)
                                                   --------------

         Total from Investment Operations                   42.24
                                                   --------------

         Less Distributions
             to Certificateholders
                 Income                                     69.16
                 Principal                                  37.61
             for Redemptions
                 Interest                                    2.26
                                                   --------------

         Total Distributions                               109.03
                                                   --------------

         Net Asset Value, End of Year**           $      1,028.44
                                                   --------------
                                                   --------------


         See "Financial and Statistical Information" in Part A of this
         Prospectus for amounts of per unit distributions during the years ended
         December 31, 1996, 1995 and 1994 based on actual units.

(1)      Net gain or loss on investments is a result of changes in outstanding
         units since January 1, 1996 and the dates of net gain and loss on
         investments.


- -------------------------
     *   Unless otherwise stated, based upon average units outstanding during
         the year of 5,372 ([5,105 + 5,639]/2).

     **  Based upon actual units outstanding.

<PAGE>

   
                     Prospectus Part A Dated April 30, 1997
    


                       INSURED MUNICIPAL SECURITIES TRUST
                           NEW YORK NAVIGATOR INSURED

                                    SERIES 3



   
                  The Trust is a unit investment trust designated Series 3 ("New
York Navigator Trust") with an underlying portfolio of long-term insured
tax-exempt bonds issued by or on behalf of states, municipalities and public
authorities and was formed to preserve capital and to provide interest income
(including, where applicable, earned original issue discount) which, in the
opinions of bond counsel to the respective issuers, is, with certain exceptions,
currently exempt from regular federal income tax under existing law and from New
York State and City personal income tax. There can be no assurance that the
Trust's investment objectives will be achieved. Although the Supreme Court has
determined that Congress has the authority to subject the interest on bonds such
as the Bonds in the Trust to regular federal income taxation, existing law
excludes such interest from regular federal income tax. Such interest income
may, however, be a specific preference item for purposes of the federal
individual and/or corporate alternative minimum tax. (See "Description of
Portfolio" in this Part A for a list of these Bonds which pay interest income
subject to the federal individual alternative minimum tax.) In addition, capital
gains are subject to tax. (See "Tax Status" and "The Trust--Portfolio" in Part B
of this Prospectus.) The Sponsors are Reich & Tang Distributors L.P. and Gruntal
& Co., L.L.C. (sometimes referred to as the "Sponsor" or the "Sponsors"). The
value of the Units of the Trust will fluctuate with the value of the underlying
bonds. Minimum purchase: 1 Unit.

                  This Prospectus consists of two parts. Part A contains the
Summary of Essential Information as of December 31, 1996 (the "Evaluation
Date"), a summary of certain specific information regarding the Trust and
audited financial statements of the Trust, including the related portfolio, as
of the Evaluation Date. Part B of this Prospectus contains a general summary of
the Trust. Part A of this Prospectus may not be distributed unless accompanied
by Part B. Investors should retain both parts of this Prospectus for future
reference.
    


         THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
         SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
         NOR HAS THE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON
         THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
         CONTRARY IS A CRIMINAL OFFENSE.

- --------------------------------------------------------------------------------

   
                  THE TRUST. The Trust seeks to achieve its investment
objectives through investment in a fixed, diversified portfolio of long-term
insured bonds (the "Bonds") issued by or on behalf of states, municipalities and
public authorities which, because of irrevocable insurance, were rated "AAA" by
Standard & Poor's Corporation. All of the Bonds in the Trust were rated "AAA" by
Standard & Poor's Corporation at the time originally deposited in the Trust (see
"Portfolio"). This rating results from insurance relating only to the Bonds in
the Trust and not to Units of the Trust. The insurance does not remove market
risk, as it does not guarantee the market value of the Units. For a discussion
of the significance of such ratings, see "Description of Bond Ratings" in Part B
of this Prospectus.
    


109761.1

<PAGE>



   
                  Some of the aggregate principal amount of the Bonds in the
Trust may be "Zero Coupon Bonds," which are original issue discount bonds that
provide for payment at maturity at par value, but do not provide for the payment
of current interest (for the amount of Zero Coupon Bonds in each Trust, and the
cost of such Bonds to that Trust, see "Description of Portfolio" in this Part
A). The payment of interest and preservation of capital are, of course,
dependent upon the continuing ability of the issuers of the Bonds or the insurer
thereof to meet their obligations.

                  Investment in the Trust should be made with an understanding
of the risks which an investment in long-term fixed rate debt obligations may
entail, including the risk that the value of the underlying portfolio will
decline with increases in interest rates, and that the value of Zero Coupon
Bonds is subject to greater fluctuation than coupon bonds in response to such
changes in interest rates. A Trust designated as a long-term trust must have a
dollar-weighted average portfolio maturity of more than ten years.

                  Each Unit in the Trust represents a 1/4728th undivided
interest in the principal and net income of the Trust. The principal amount of
Bonds deposited in the Trust per Unit is reflected in the Summary of Essential
Information. (See "Organization" in Part B of this Prospectus.) The Units being
offered hereby are issued and outstanding Units which have been purchased by the
Sponsors in the secondary market.

                  INSURANCE. Each of the Bonds in the New York Navigator Trust
is insured by a municipal bond guaranty insurance policy obtained by the
Sponsors (the "Navigator Sponsor-Insured Bonds") from MBIA Insurance Corporation
("MBIA Corp.") covering regularly scheduled payments of principal thereof and
interest thereon when such amounts become due for payment but shall not have
been paid. For discussion of the effect of an occurrence of non-payment of
principal or interest on any Bonds in the New York Navigator Trust see
"Portfolio Supervision" in Part B of this Prospectus. The premiums for the
Navigator Sponsor-Insured Bonds are obligations of the Sponsors. Additionally,
some of the Bonds in the New York Navigator Trust may be Pre- Insured Bonds (as
described below). The premium for the Pre-Insured Bonds is an obligation of the
issuers, underwriters or prior owners of those Bonds. The insurance policy or
policies relating to the Navigator Sponsor-Insured Bonds provides that, to the
extent that Bonds are both Pre-Insured Bonds and Navigator Sponsor-Insured
Bonds, coverage is effective after a claim has been made upon the insurer of the
Pre-Insured Bonds.

                  Some of the Bonds in the New York Navigator Trust may
additionally be insured by a municipal bond guaranty insurance policy obtained
by issuers, underwriters or prior owners of the Bonds ("Pre-Insured Bonds") and
issued by one of the insurance companies described under "Insurance on the
Bonds" in Part B of this Prospectus (the "Insurance Companies").

                  None of the insurance will cover accelerated payments of
principal or penalty interest or premiums unrelated to taxability of interest on
the Bonds. The insurance relates only to the prompt payment of principal of and
interest on the securities in the portfolios, and does not remove market risks
nor does it guarantee the market value of Units in the Trusts. The terms of he
insurance are more fully described herein. No representation is made herein as
to any Bond insurer's ability to meet its obligations under a policy of
insurance relating to any of the Pre-Insured Bonds. In addition, investors
should be aware that subsequent to the Date of Deposit the rating of the
claims-paying ability of the insurer of an underlying Pre-Insured Bond may be
downgraded.

                All of the Bonds in the New York Navigator Trust are covered by
insurance obtained by the Sponsors from MBIA Corp. and 44.9% of the Bonds in
    

                                       A-2

109761.1

<PAGE>



   
the New York Navigator Trust are Pre-Insured Bonds.  The approximate
percentage of the aggregate principal amount of the Portfolio that is insured
by each Insurance Company with respect to Pre-Insured Bonds is as follows:
AMBAC Indemnity Corp. ("AMBAC"), 9.1%; Bond Investors Guaranty ("BIG"), 4.9%;
Capital Guaranty Insurance Company ("Capital Guaranty"), 14.8%; and Municipal
Bond Investors Assurance Corporation ("MBIA"), 16.1%.

                  PUBLIC OFFERING PRICE. The secondary market Public Offering
Price of each Unit is equal to the aggregate offering price of the Bonds in such
Trust divided by the number of Units outstanding, plus a sales charge of 3.2% of
the Public Offering Price, or 3.296% of the net amount invested in Bonds per
Unit. In addition, accrued interest to the expected date of settlement is added
to the Public Offering Price. If Units had been available for sale on the
Evaluation Date, the Public Offering Price per Unit would have been $1,106.99
plus accrued interest of $9.35 under the monthly distribution plan, $15.23 under
the semi-annual distribution plan and $15.26 under the annual distribution plan,
for a total of $1,116.34, $1,122.22 and $1,122.25, respectively. The Public
Offering Price per Unit can vary on a daily basis in accordance with
fluctuations in the aggregate bid price of the Bonds. (See "Public
Offering--Offering Price" in Part B of this Prospectus.)

                  ESTIMATED LONG TERM RETURN AND ESTIMATED CURRENT RETURN. Units
of each Trust are offered to investors on a "dollar price" basis (using the
computation method described under "Public Offering--Offering Price" in Part B)
as distinguished from a "yield price" basis often used in offerings of tax
exempt bonds (involving the lesser of the yield as computed to maturity of bonds
or to an earlier redemption date). Since they are offered on a dollar price
basis, the rate of return on an investment in Units of each Trust is measured in
terms of "Estimated Current Return" and "Estimated Long Term Return".
    

                  Estimated Long Term Return is calculated by: (1) computing the
yield to maturity or to an earlier call date (whichever results in a lower
yield) for each Bond in the Trust's portfolio in accordance with accepted bond
practices, which practices take into account not only the interest payable on
the Bond but also the amortization of premiums or accretion of discounts, if
any; (2) calculating the average of the yields for the Bonds in the Trust's
portfolio by weighing each Bond's yield by the market value of the Bond and by
the amount of time remaining to the date to which the Bond is priced (thus
creating an average yield for the portfolio of the Trust); and (3) reducing the
average yield for the portfolio of the Trust in order to reflect estimated fees
and expenses of the Trust and the maximum sales charge paid by investors. The
resulting Estimated Long Term Return represents a measure of the return to
investors earned over the estimated life of the Trust. (For the Estimated Long
Term Return to Certificateholders under the monthly, semi-annual and annual
distribution plans, see "Summary of Essential Information".)

                  Estimated Current Return is a measure of the Trust's cash
flow. Estimated Current Return is computed by dividing the Estimated Net Annual
Interest Income per Unit by the Public Offering Price per Unit. In contrast to
the Estimated Long Term Return, the Estimated Current Return does not take into
account the amortization of premium or accretion of discount, if any, on the
Bonds in the portfolio of the Trust. Moreover, because interest rates on Bonds
purchased at a premium are generally higher than current interest rates on newly
issued bonds of a similar type with comparable rating, the Estimated Current
Return per Unit may be affected adversely if such Bonds are redeemed prior to
their maturity.

                  The Estimated Net Annual Interest Income per Unit of the Trust
will vary with changes in the fees and expenses of the Trustee and the Evaluator
applicable to the Trust and with the redemption, maturity, sale or

                                       A-3

109761.1

<PAGE>



other disposition of the Bonds in the Trust. The Public Offering Price will vary
with changes in the bid prices of the Bonds. Therefore, there is no assurance
that the present Estimated Current Return or Estimated Long Term Return will be
realized in the future. (For the Estimated Current Return to Certificateholders
under the monthly, semi-annual and annual distribution plans, see "Summary of
Essential Information". See "Estimated Long Term Return and Estimated Current
Return" in Part B of this Prospectus.)

                  A schedule of cash flow projections is available from the
Sponsors upon request.

                  DISTRIBUTIONS. Distributions of interest income, less
expenses, will be made by the Trust either monthly, semi-annually or annually
depending upon the plan chosen by the Certificateholder. Certificateholders
purchasing Units in the secondary market will initially receive distributions in
accordance with the elections of the prior owner and may thereafter change the
plan as provided under "Interest and Principal Distributions" in Part B of this
Prospectus. Distributions of principal, if any, will be made semi-annually on
June 15 and December 15 of each year. (See "Rights of
Certificateholders--Interest and Principal Distributions" in Part B of this
Prospectus. For estimated monthly, semi-annual and annual interest
distributions, see "Summary of Essential Information.")

   
                  MARKET FOR UNITS. The Sponsors, although not obligated to do
so, presently maintain and intend to continue to maintain a secondary market for
the Units at a price based on the aggregate bid price of the Bonds in the Trust
portfolio. The reoffer price will be based on the aggregate bid price of the
Bonds plus a sales charge of 3.2% of the Public Offering Price (3.296% of the
net amount invested), plus net accrued interest. If a market is not maintained a
Certificateholder will be able to redeem his or her Units with the Trustee at a
price based on the aggregate bid price of the Bonds. (See "Sponsor Repurchase"
and "Public Offering--Offering Price" in Part B of this Prospectus.)
    

                  TOTAL REINVESTMENT PLAN. Certificateholders under the
semi-annual and annual plans of distribution have the opportunity to have all
their regular interest distributions, and principal distributions, if any,
reinvested in available series of "Insured Municipal Securities Trust" or
"Municipal Securities Trust." (See "Total Reinvestment Plan" in Part B of this
Prospectus. Residents of Texas see "Total Reinvestment Plan for Texas Residents"
in Part B of this Prospectus.) The Plan is not designed to be a complete
investment program.

                                       A-4

109761.1

<PAGE>



                       INSURED MUNICIPAL SECURITIES TRUST
                           NEW YORK NAVIGATOR INSURED
                                    SERIES 3

   
            SUMMARY OF ESSENTIAL INFORMATION AS OF DECEMBER 31, 1996
    
<TABLE>
<CAPTION>


Date of Deposit:  June 28, 1990                                   Weighted Average Life to
- ---------------                                                   ------------------------
<S>                                          <C>                                <C>       
   
Principal Amount of Bonds ...                $4,725,000              Maturity:  8.8 Years.
- -------------------------                                            --------
Number of Units .............                4,728                Minimum Value of Trust:
- ---------------                                                   ----------------------
Fractional Undivided Inter-                                          Trust may be terminated if
- --------------------------
  est in Trust per Unit .....                1/4728                  value of Trust is less than
  ---------------------
Principal Amount of                                                  $2,400,000 in principal amount
- -------------------
  Bonds per Unit ............                $999.37                 of Bonds.
  --------------
Secondary Market Public                                           Mandatory Termination Date:
- -----------------------                                           --------------------------
  Offering Price**                                                   The earlier of December 31,
  Aggregate Bid Price                                                2039 or the disposition of the
    of Bonds in Trust .......                $5,066,859+++           last Bond in the Trust.
  Divided by 4,728 Units ....                $1,071.67            Trustee***:  The Chase Manhattan
                                                                  -------
  Plus Sales Charge of 3.2%                                          Bank.
    of Public Offering Price                 $35.32               Trustee's Annual Fee:  Monthly
  Public Offering Price                                              plan $.98 per $1,000; semi-
    per Unit ................                $1,106.99+              annual plan $.52 per $1,000;
Redemption and Sponsors'                                             and annual plan is $.34 per
- ------------------------
  Repurchase Price                                                   $1,000.
  per Unit ..................                $1,071.67+           Evaluator:  Kenny S&P Evaluation
  --------                                                        ---------
                                                      +++            Services.
                                                      ++++        Evaluator's Fee for Each
Excess of Secondary Market                                           Evaluation:  Minimum of $8 plus
- --------------------------                                           ----------
  Public Offering Price                                              $.25 per each issue of Bonds in
  ---------------------
  over Redemption and                                                excess of 50 issues (treating
  -------------------
  Sponsors' Repurchase                                               separate maturities as separate
  --------------------
  Price per Unit ............                $35.32++++              issues).
  --------------
Difference between Public                                         Sponsors:  Reich & Tang
- -------------------------                                         --------
  Offering Price per Unit                                            Distributors L.P. and Gruntal &
  -----------------------
  and Principal Amount per                                           Co., L.L.C.
  ------------------------
  Unit Premium/(Discount) ...                $107.62              Sponsors' Annual Fee:  Maximum of
  -----------------------                                         --------------------
Evaluation Time:  4:00 p.m.                                          $.25 per $1,000 principal
  New York Time.                                                     amount of Bonds (see "Trust
Minimum Principal Distribution:                                      Expenses and Charges" in Part B
  $1.00 per Unit.                                                    of this Prospectus).
    

</TABLE>


       PER UNIT INFORMATION BASED UPON INTEREST DISTRIBUTION PLAN ELECTED


<TABLE>
<CAPTION>

                                                             Monthly          Semi-Annual            Annual
                                                             Option             Option               Option

<S>                                                            <C>                  <C>                  <C>   
   
Gross annual interest income# .........                        $71.95               $71.95               $71.95
Less estimated annual fees and
  expenses ............................                          2.13                 1.54                 1.24
Estimated net annual interest                                  ______               ______               ______
  income (cash)# ......................                        $69.82               $70.41               $70.71
Estimated interest distribution# ......                          5.81                35.20                70.71
Estimated daily interest accrual# .....                         .1939                .1955                .1964
Estimated current return#++ ...........                         6.31%                6.36%                6.39%
Estimated long term return++ ..........                         4.43%                4.48%                4.51%
    
Record dates ..........................                      1st of           Dec. 1 and             Dec. 1
                                                             each month       June 1
Interest distribution dates ...........                      15th of          Dec. 15 and            Dec. 15
                                                             each month       June 15
</TABLE>


                                       A-5

109761.1

<PAGE>



                  Footnotes to Summary of Essential Information

   *    The Date of Deposit is the date on which the Trust Agreement was signed
        and the deposit of the Bonds with the Trustee made.

  **    For information regarding offering price per Unit and applicable sales
        charge under the Total Reinvestment Plan, see "Total Reinvestment Plan"
        in Part B of this Prospectus.

   
 ***    The Trustee maintains its principal executive office at 270 Park
        Avenue, New York, New York 10017 and its unit investment trust office
        at 4 New York Plaza, New York, New York 10004 (tel. no.:
        1-800-882-9898). For information regarding redemption by the Trustee,
        see "Trustee Redemption" in Part B of this Prospectus.

   +    Plus accrued interest to the expected date of settlement (approximately
        three business days after purchase) of $9.35 monthly, $15.23
        semi-annually and $15.26 annually.
    

  ++    The estimated current return and estimated long term return are
        increased for transactions entitled to a discount (see "Employee
        Discounts" in Part B of this Prospectus), and are higher under the
        semi-annual and annual options due to lower Trustee's fees and
        expenses.

 +++    Based solely upon the bid side evaluation of the underlying Bonds
        (including, where applicable, undistributed cash from the principal
        account). Upon tender for redemption, the price to be paid will be
        calculated as described under "Trustee Redemption" in Part B of this
        Prospectus.

++++    See "Comparison of Public Offering Price, Sponsor's Repurchase Price and
        Redemption Price" in Part B of this Prospectus.

   #    Does not include income accrual from original issue discount bonds, if
        any.

                      FINANCIAL AND STATISTICAL INFORMATION


Selected data for each Unit outstanding for the periods listed below:

<TABLE>
<CAPTION>

                                                                                                    Distribu-
                                                                                                    tions of
                                                           Distributions of Interest                Principal
                                                          During the Period (per Unit)               During
                                         Net Asset*                       Semi-                       the
                         Units Out-        Value          Monthly         Annual          Annual     Period
Period Ended              standing        Per Unit        Option          Option          Option    (Per Unit)
- ------------             ----------      ----------       -------         ------          ------    ----------

<S>                             <C>         <C>             <C>             <C>              <C>              <C>
   
December 31, 1994               5,528       $1,062.79       $71.21          $71.91           $72.12          -0-
December 31, 1995               5,446        1,116.78        74.66           75.30            75.50          -0-
December 31, 1996               4,728        1,085.93        70.89           71.50            71.54        $1.87

- --------
*        Net Asset Value per Unit is calculated by dividing net assets as
         disclosed in the "Statement of Net Assets" by the number of Units
         outstanding as of the date of the Statement of Net Assets. See Note 5
         of Notes to Financial Statements for a description of the components of
         Net Assets.
    
</TABLE>

                                       A-6

109761.1

<PAGE>


   
                         INFORMATION REGARDING THE TRUST
                             AS OF DECEMBER 31, 1996
    


DESCRIPTION OF PORTFOLIO*

   
                  The portfolio of the Trust consists of 11 issues representing
obligations of 10 issuers located in the state of New York. The Sponsor has
participated as a sole underwriter or manager, co-manager or member of an
underwriting syndicate from which 8.5% of the initial aggregate principal amount
of the Bonds were acquired. None of the Bonds are obligations of state and local
housing authorities; approximately 29.6%+ are hospital revenue bonds; none were
issued in connection with the financing of nuclear generating facilities; and
none are "mortgage subsidy" bonds. All of the Bonds in the Trust are subject to
redemption prior to their stated maturity dates pursuant to sinking fund or
optional call provisions. The Bonds may also be subject to other calls, which
may be permitted or required by events which cannot be predicted (such as
destruction, condemnation, termination of a contract, or receipt of excess or
unanticipated revenues). Three of the issues representing $805,000 of the
principal amount of the Bonds are general obligation bonds. All 8 of the
remaining issues representing $3,920,000 of the principal amount of the Bonds
are payable from the income of a specific project or authority and are not
supported by the issuer's power to levy taxes. The portfolio is divided for
purpose of issue as follows: Correctional Facility 2, Hospital 2, Transit
Facility 1, University 2 and Water 1. For an explanation of the significance of
these factors see "The Trust--Portfolio" in Part B of this Prospectus.

                  As of December 31, 1996, $600,000 (approximately 12.7% of the
aggregate principal amount of the Bonds) were original issue discount bonds.
None of the Bonds were Zero Coupon Bonds. Approximately 15.4% of the aggregate
principal amount of the Bonds in the Trust were purchased at a "market" discount
from par value at maturity, approximately 66.5% were purchased at a premium and
approximately 5.3% were purchased at par. For an explanation of the significance
of these factors see "Discount and Zero Coupon Bonds" in Part B of this
Prospectus. All of the Bonds are subject to redemption prior to maturity
pursuant to sinking fund or call provisions.

                  None of the Bonds in the Trust are subject to the federal
individual alternative minimum tax under the Tax Reform Act of 1986.  See "Tax
Status" in Part B of this Prospectus.

- --------
*      Changes in the Trust Portfolio:  From January 1, 1997 to March 21, 1997,
       $140,000 of the principal amount of the Bond in portfolio no. 8 was sold
       and is no longer contained in the Trust.  117 Units were redeemed from
       the Trust.

+      A trust is considered to be "concentrated" in a particular category or
       industry when the securities in that category or industry constitute
       25% or more of the aggregate face amount of the portfolio. See Part B
       for disclosure, including risk factors, regarding this concentration.
    

                                       A-7

109761.1
<PAGE>
                        Report of Independent Accountants


To the Sponsor, Trustee and Certificateholders of
Insured Municipal Securities Trust, New York Navigator
Insured Series 3

In our opinion, the accompanying statement of net assets, including the
portfolio of investments, and the related statements of operations and of
changes in net assets and the financial highlights present fairly, in all
material respects, the financial position of Insured Municipal Securities Trust,
New York Navigator Insured Series 3 (the "Trust") at December 31, 1996, the
results of its operations, the changes in its net assets and the financial
highlights for the year then ended, in conformity with generally accepted
accounting principles. These financial statements and financial highlights
(hereafter referred to as "financial statements") are the responsibility of the
Trust's management; our responsibility is to express an opinion on these
financial statements based on our audit. We conducted our audit of these
financial statements in accordance with generally accepted auditing standards
which require that we plan and perform the audit to obtain reasonable assurance
about whether the financial statements are free of material misstatement. An
audit includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements, assessing the accounting principles
used and significant estimates made by management, and evaluating the overall
financial statement presentation. We believe that our audit, which included
confirmation of securities at December 31, 1996 by correspondence with the
Trustee, provides a reasonable basis for the opinion expressed above. The
financial statements for the prior periods presented were audited by other
independent accountants whose report dated March 31, 1996 expressed an
unqualified opinion on those financial statements.




PRICE WATERHOUSE LLP
160 Federal Street
Boston, MA 02110
March 28, 1997


<PAGE>

<TABLE>

Insured Municipal Securities Trust,
New York Navigator Insured Series 3
Portfolio
December 31, 1996
- ----------------------------------------------------------------------------------------------------------------------------
<CAPTION>

                                                                                                                            
                   Aggregate                                                                                   Coupon Rate/ 
  Portfolio        Principal          Name of Issuer and                                     Ratings            Date(s) of  
     No.            Amount              Title of Bonds                                         (1)             Maturity (2) 
<S>            <C>                 <C>                                                       <C>              <C>

     1         $      500,000      N.Y. State Dorm. City Univ. Sys. Consldtd.                  AAA            5.000%        
                                   Second Gen. Resolution Rev. Bonds Series 1990                              7/01/2017     
                                   C (MBIA)

     2                230,000      Dorm. Auth. of the State of N.Y. Judicial Facs.             AAA            7.375         
                                   Lease Rev. Bonds (Suffolk Cnty. Issue)                                     7/01/2016     
                                   Series 1986 (MBIA)

     3                700,000      N.Y. State Dorm. Auth. State Univ. Ed. Facs.                AAA            7.700         
                                   Rev. Bonds Series 1990 A (MBIA)                                            5/15/2012     

     4                700,000      N.Y State Med. Care Facs. Finc. Agncy.                      AAA            7.450         
                                   St. Luke's Roosevelt Hosp. Cntr. FHA Insrd.                                2/15/2029     
                                   Mtg. Rev. Bonds Series B (MBIA)

    5a                230,000      N.Y. State Med. Care Facs. Finc. Agncy. Mental              AAA            7.875         
                                   Hlth. Servs. Facs. Imprvmnt. Rev. Bonds 1988                               8/15/2015     
                                   Series B (MBIA)

    5b                470,000      N.Y State Med. Care Facs. Finc. Agncy. Mental               AAA            7.875         
                                   Hlth. Servs. Facs. Imprvmnt. Rev. Bonds 1988                               8/15/2015     
                                   Series A (MBIA)

     6                600,000      N.Y. State Urban Dev. Corp. Correc. Facs. Rev.              AAA            6.000         
                                   Bonds Series G (MBIA)                                                      1/01/2019     

     7                430,000      Metro. Trans. Auth. Transit Facs. Serv. Cntrct.             AAA            7.500         
                                   Rev. Bonds Series K (MBIA)                                                 7/01/2017     

     8                355,000      N.Y. City Gen. Oblig. Rev. Bonds 1987 Series A              AAA            8.500         
                                   (MBIA)                                                                     11/01/2011    

    9a                125,000      City of N.Y. Gen. Oblig. Serial Rev. Bonds                  AAA            7.750         
                                   Fiscal 1990 Series I (MBIA)                                                8/15/2024     

    9b                 75,000      City of N.Y. Gen. Oblig. Serial Rev. Bonds                  AAA            7.750         
                                   Fiscal 1990 Series I (MBIA)                                                8/15/2024     

    10                 60,000      N.Y. City Muni. Wtr. Finc. Auth. Wtr. & Swr.                AAA            7.800         
                                   Sys. Rev. Bonds Fiscal 1988 Series B (MBIA)                                6/15/2018     

    11                250,000      Yonkers N.Y. Gen. Oblig. Schl. Bonds                        AAA            7.375         
                                   Series 1990 C (MBIA)                                                       12/01/2009    
               --------------

               $    4,725,000      Total Investments (Cost $4,572,342)                                                      
               --------------
               --------------
</TABLE>


                      Redemption
                    Feature (2)(4)
  Portfolio        S.F.-Sinking Fund            Market
     No.            Ref.-Refunding             Value (3)

     1          No Sinking Fund           $          462,550
                7/01/00 @ 100 Ref.
               

     2          7/01/00 @ 100 S.F.                   278,505
                None
               

     3          5/15/06 @ 100 S.F.                   786,989
                5/15/00 @ 102 Ref.

     4          2/15/98 @ 100 S.F.                   776,580
                2/15/00 @ 102 Ref.
               

    5a          8/15/11 @ 100 S.F.                   246,838
                8/15/98 @ 102 Ref.
               

    5b          8/15/11 @ 100 S.F.                   508,084
                8/15/98 @ 102 Ref.
               

     6          1/01/18 @ 100 S.F.                   607,698
                1/01/00 @ 100 Ref.

     7          7/01/09 @ 100 S.F.                   460,982
                7/01/98 @ 102 Ref.

     8          No Sinking Fund                      374,543
                11/01/97 @ 101.5 Ref.

    9a          No Sinking Fund                      137,845
                8/15/99 @ 101.5 Ref.

    9b          No Sinking Fund                       81,844
                8/15/99 @ 101.5 Ref.

    10          6/15/09 @ 100 S.F.                    62,342
                6/15/97 @ 102 Ref.

    11          12/01/04 @ 100 S.F.                  282,047
                12/01/00 @ 102 Ref.

                                          ------------------

                                          $        5,066,847
                                          ------------------
                                          ------------------



   See accompanying footnotes to portfolio and notes to financial statements.

<PAGE>


Insured Municipal Securities Trust,
New York Navigator Insured Series 3
Footnotes to Portfolio
- --------------------------------------------------------------------------------

1.       All ratings are by Kenny S&P Evaluation Services, a business unit of
         J.J. Kenny Company, Inc., a subsidiary of The McGraw-Hill Companies,
         Inc. A brief description of the ratings symbols and their meaning is
         set forth under "Description of Bond Ratings" in Part B of the
         Prospectus.

2.       See "The Trust - Portfolio" in Part B of the Prospectus for an
         explanation of redemption features. See "Tax Status" in Part B of the
         Prospectus for a statement of the Federal tax consequences to a
         Certificateholder upon the sale, redemption or maturity of a bond.

3.       At December 31, 1996, the net unrealized appreciation of all the bonds
         was comprised of the following:

               Gross unrealized appreciation        $         501,939
               Gross unrealized depreciation                   (7,434)
                                                    ------------------


               Net unrealized appreciation          $         494,505
                                                    ------------------
                                                    ------------------


4.       The Bonds may also be subject to other calls, which may be permitted or
         required by events which cannot be predicted (such as destruction,
         condemnation, termination of a contract, or receipt of excess or
         unanticipated revenues).



   The accompanying notes form an integral part of the financial statements.

<PAGE>






Insured Municipal Securities Trust,

New York Navigator Insured Series 3
Statement of Net Assets
December 31, 1996
- --------------------------------------------------------------------------------

Investments in Securities,
     at Market Value (Cost $4,572,342)           $    5,066,847
                                                 --------------

Other Assets
     Accrued Interest                                   115,149
                                                 --------------

         Total Other Assets                             115,149
                                                 --------------

Liabilities
     Accrued Expenses                                     1,526
     Advance from Trustee                                46,194
                                                 --------------
         Total Liabilities                               47,720
                                                 --------------

Excess of Other Assets over Total Liabilities            67,429
                                                 --------------

Net Assets (4,728 Units of Fractional Undivided
     Interest Outstanding, $1,085.93 per Unit)   $    5,134,276
                                                 --------------
                                                 --------------



   The accompanying notes form an integral part of the financial statements.



<PAGE>
<TABLE>

Insured Municipal Securities Trust,
New York Navigator Insured Series 3
Statement of Operations
- --------------------------------------------------------------------------------
<CAPTION>

                                                                         For the Years Ended December 31,
                                                               1996                       1995                  1994
<S>                                                     <C>                        <C>                    <C>

Investment Income
     Interest                                           $   372,906                $   404,240            $  410,083
                                                        -----------                -----------            ----------

Expenses
     Trustee's Fees                                           6,185                      5,739                 6,037
     Evaluator's Fees                                         2,372                      2,000                 2,205
     Sponsers Advisory Fee                                    1,353                      1,386                 1,437
                                                        -----------                -----------            ----------

         Total Expenses                                       9,910                      9,125                 9,679
                                                        -----------                -----------            ----------

     Net Investment Income                                  362,996                    395,115               400,404
                                                        -----------                -----------            ----------

Realized and Unrealized Gain (Loss)
     Realized Gain on
         Investments                                         21,676                      4,505                13,702

     Change in Unrealized Appreciation
         (Depreciation) on Investments                     (175,559)                   311,690              (626,366)
                                                        -----------                -----------            ----------

     Net Gain (Loss) on Investments                        (153,883)                   316,195              (612,664)
                                                        -----------                -----------            ----------

     Net Increase (Decrease)
         in Net Assets
         Resulting From Operations                      $   209,113                $   711,310            $ (212,260)
                                                        -----------                -----------            ----------
                                                        -----------                -----------            ----------
</TABLE>




   The accompanying notes form an integral part of the financial statements.



<PAGE>


<TABLE>

Insured Municipal Securities Trust,
New York Navigator Insured Series 3
Statement of Changes in Net Assets
- --------------------------------------------------------------------------------
<CAPTION>

                                                                           For the Years Ended December 31,
                                                                  1996                    1995                  1994
<S>                                                      <C>                     <C>                   <C>

Operations
Net Investment Income                                    $     362,996           $     395,115         $     400,404
Realized Gain
     on Investments                                             21,676                   4,505                13,702
Change in Unrealized Appreciation
     (Depreciation) on Investments                            (175,559)                311,690              (626,366)
                                                         -------------           -------------         -------------

          Net Increase (Decrease) in
                Net Assets Resulting
                From Operations                                209,113                 711,310              (212,260)
                                                         -------------           -------------         -------------

Distributions to Certificateholders
     Investment Income                                         362,240                 413,714               397,354
     Principal                                                   8,841                    ----                  ----

Redemptions
     Interest                                                   11,978                     847                 6,587
     Principal                                                 773,761                  89,851               224,424
                                                         -------------           -------------         -------------

         Total Distributions
             and Redemptions                                 1,156,820                 504,412               628,365
                                                         -------------           -------------         -------------

         Total Increase (Decrease)                            (947,707)                206,898              (840,625)

Net Assets
     Beginning of Year                                       6,081,983               5,875,085             6,715,710
                                                         -------------           -------------         -------------

     End of Year (Including
         Undistributed Net Investment
         Income of $67,418, $78,640
         and $98,086, Respectively)                       $  5,134,276            $  6,081,983          $  5,875,085
                                                         -------------           -------------         -------------
                                                         -------------           -------------         -------------
</TABLE>



   The accompanying notes form an integral part of the financial statements.



<PAGE>



Insured Municipal Securities Trust,
New York Navigator Insured Series 3
Notes to Financial Statements
- --------------------------------------------------------------------------------
1.       Organization

         Insured Municipal Securities Trust, New York Navigator Insured Series 3
         (the "Trust") was organized on June 28, 1990 by Bear, Stearns & Co.
         Inc. and Gruntal & Co., Incorporated under the laws of the State of New
         York by a Trust Indenture and Agreement, and is registered under the
         Investment Company Act of 1940. The Trust was formed to preserve
         capital and to provide interest income.

         Effective September 28, 1995, Reich & Tang Distributors L.P. ("Reich &
         Tang") has become the successor sponsor (the "Sponsor") to certain of
         the unit investment trusts previously sponsored by Bear, Stearns & Co.
         Inc. As successor Sponsor, Reich & Tang has assumed all of the
         obligations and rights of Bear, Stearns & Co. Inc., the previous
         sponsor. Effective September 2, 1995, United States Trust Company of
         New York was merged into The Chase Manhattan Bank (the Trustee).
         Accordingly, Chase is the successor trustee of the Trust.

2.       Summary of Significant Accounting Policies

         The following is a summary of significant accounting policies
         consistently followed by the Trust in preparation of its financial
         statements. The policies are in conformity with generally accepted
         accounting principles ("GAAP"). The preparation of financial statements
         in accordance with GAAP requires management to make estimates and
         assumptions that affect the reported amounts and disclosures in the
         financial statements. Actual amounts could differ from those estimates.
         Interest income is recorded on the accrual basis.

         Security Valuation
         Investments are carried at market value which is determined by Kenny
         S&P Evaluation Services, a business unit of J.J. Kenny Company, Inc., a
         subsidiary of The McGraw-Hill Companies, Inc. The market value of the
         portfolio is based upon the bid prices for the bonds at the end of the
         year, which approximates the fair value of the security at that date,
         except that the market value on the date of deposit represents the cost
         to the Trust based on the offering prices for investments at that date.
         The difference between cost and market value is reflected as unrealized
         appreciation (depreciation) of investments. Securities transactions are
         recorded on the trade date. Realized gains (losses) from securities
         transactions are determined on the basis of average cost of the
         securities sold or redeemed.


<PAGE>



Insured Municipal Securities Trust,
New York Navigator Insured Series 3
Notes to Financial Statements
- --------------------------------------------------------------------------------
3.       Income Taxes

         No provision for federal income taxes has been made in the accompanying
         financial statements because the Trust intends to continue to qualify
         for the tax treatment applicable to Grantor Trusts under the Internal
         Revenue Code. Under existing law, if the Trust so qualifies, it will
         not be subject to federal income tax on net income and capital gains
         that are distributed to unitholders.

4.       Trust Administration

         The Trustee has custody of assets and responsibility for the accounting
         records and financial statements of the Trust and is responsible for
         establishing and maintaining a system of internal control related
         thereto. The Trustee is also responsible for all estimates of expenses
         and accruals reflected in the Trust's financial statements.

         The Trust Indenture and Agreement provides for interest distributions
         as often as monthly (depending upon the distribution plan elected by
         the Certificateholders).

         The Trust Indenture and Agreement further requires that principal
         received from the disposition of bonds, other than those bonds sold in
         connection with the redemption of units, be distributed to
         Certificateholders.

         The Trust Indenture and Agreement also requires the Trust to redeem
         units tendered. For the years ended December 31, 1996, 1995 and 1994,
         718, 82 and 208 units were redeemed, respectively.

         The Trust pays an annual fee for trustee services rendered by the
         Trustee that ranges from $.34 to $.98 per $1,000 of outstanding
         investment principal. In addition, a minimum fee of $8.00 is paid to a
         service bureau for each portfolio valuation. A maximum fee of $.25 per
         $1,000 of outstanding investment principal is paid to the Sponsor. For
         the year ended December 31, 1996, the "Trustee's Fees" are comprised of
         Trustee fees of $4,106 and other expenses of $2,079. The other expenses
         include professional, printing and miscellaneous fees.



<PAGE>



Insured Municipal Securities Trust,
New York Navigator Insured Series 3
Notes to Financial Statements
- --------------------------------------------------------------------------------
5.       Net Assets

         At December 31, 1996, the net assets of the Trust represented the
         interest of Certificateholders as follows:

             Original cost to Certificateholders               $     6,183,780
             Less Initial Gross Underwriting Commission                303,005
                                                               ---------------
                                                                     5,880,775
             Accumulated Cost of Securities Sold,
                Matured or Called                                   (1,308,433)
             Net Unrealized Appreciation                               494,505
             Undistributed Net Investment Income                        67,418
             Undistributed Proceeds From Investments                        11
                                                               ---------------

                Total                                          $     5,134,276
                                                               ---------------
                                                               ---------------

         The original cost to Certificateholders, less the initial gross
         underwriting commission, represents the aggregate initial public
         offering price net of the applicable sales charge on 6,000 units of
         fractional undivided interest of the Trust as of the date of deposit.

6.       Concentration of Credit Risk

         Since the Trust invests a portion of its assets in municipal bonds, it
         may be affected by economic and political developments in the
         municipalities. Certain debt obligations held by the Trust may be
         entitled to the benefit of insurance, standby letters of credit or
         other guarantees of banks or other financial institutions.


<PAGE>



Insured Municipal Securities Trust,
New York Navigator Insured Series 3
Notes to Financial Statements
- --------------------------------------------------------------------------------
7.       Financial Highlights (per unit)*

         Selected data for a unit of the Trust outstanding for the year ended
         December 31, 1996:

         Net Asset Value, Beginning of Year**         $     1,116.78
                                                      --------------

             Interest Income                                   73.31
             Expenses                                          (1.95)
                                                      --------------
             Net Investment Income                             71.36
                                                      --------------
             Net Gain or Loss on Investments(1)               (26.91)
                                                      --------------

         Total from Investment Operations                      44.45
                                                      --------------

         Less Distributions
             to Certificateholders
                 Income                                        71.21
                 Principal                                      1.74
             for Redemptions
                 Interest                                       2.35
                                                      --------------

         Total Distributions                                   75.30
                                                      --------------

         Net Asset Value, End of Year**              $      1,085.93
                                                      --------------
                                                      --------------

         See "Financial and Statistical Information" in Part A of this
         Prospectus for amounts of per unit distributions during the years ended
         December 31, 1996, 1995 and 1994 based on actual units.

(1)      Net gain or loss on investments is a result of changes in outstanding
         units since January 1, 1996 and the dates of net gain and loss on
         investments.


- -------------------------
     *   Unless otherwise stated, based upon average units outstanding during
         the year of 5,087 ([4,728 + 5,446]/2).

     **  Based upon actual units outstanding.

<PAGE>

   
                     Prospectus Part A Dated April 30, 1997
    


                       INSURED MUNICIPAL SECURITIES TRUST
                           NEW YORK NAVIGATOR INSURED

                                    SERIES 6

- --------------------------------------------------------------------------------

   
                  The Trust is a unit investment trust designated Series 6 ("New
York Navigator Trust") with an underlying portfolio of long-term insured
tax-exempt bonds issued by or on behalf of states, municipalities and public
authorities and was formed to preserve capital and to provide interest income
(including, where applicable, earned original issue discount) which, in the
opinions of bond counsel to the respective issuers, is, with certain exceptions,
currently exempt from regular federal income tax under existing law and from New
York State and City personal income tax. There can be no assurance that the
Trust's investment objectives will be achieved. Although the Supreme Court has
determined that Congress has the authority to subject the interest on bonds such
as the Bonds in the Trust to regular federal income taxation, existing law
excludes such interest from regular federal income tax. Such interest income
may, however, be a specific preference item for purposes of the federal
individual and/or corporate alternative minimum tax. (See "Description of
Portfolio" in this Part A for a list of these Bonds which pay interest income
subject to the federal individual alternative minimum tax.) In addition, capital
gains are subject to tax. (See "Tax Status" and "The Trust--Portfolio" in Part B
of this Prospectus.) The Sponsors are Reich & Tang Distributors L.P. and Gruntal
& Co., L.L.C. (sometimes referred to as the "Sponsor" or the "Sponsors"). The
value of the Units of the Trust will fluctuate with the value of the underlying
bonds. Minimum purchase: 1 Unit.

                  This Prospectus consists of two parts. Part A contains the
Summary of Essential Information as of December 31, 1996 (the "Evaluation
Date"), a summary of certain specific information regarding the Trust and
audited financial statements of the Trust, including the related portfolio, as
of the Evaluation Date. Part B of this Prospectus contains a general summary of
the Trust. Part A of this Prospectus may not be distributed unless accompanied
by Part B. Investors should retain both parts of this Prospectus for future
reference.
    


         THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
         SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
         NOR HAS THE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON
         THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
         CONTRARY IS A CRIMINAL OFFENSE.

- --------------------------------------------------------------------------------

   
                  THE TRUST. The Trust seeks to achieve its investment
objectives through investment in a fixed, diversified portfolio of long-term
insured bonds (the "Bonds") issued by or on behalf of states, municipalities and
public authorities which, because of irrevocable insurance, were rated "AAA" by
Standard & Poor's Corporation. All of the Bonds in the Trust were rated "AAA" by
Standard & Poor's Corporation at the time originally deposited in the Trust (see
"Portfolio"). This rating results from insurance relating only to the Bonds in
the Trust and not to Units of the Trust. The insurance does not remove market
risk, as it does not guarantee the market value of the Units. For a discussion
of the significance of such ratings, see "Description of Bond Ratings" in Part B
of this Prospectus.
    


109758.1

<PAGE>



   
                  Some of the aggregate principal amount of the Bonds in the
Trust may be "Zero Coupon Bonds," which are original issue discount bonds that
provide for payment at maturity at par value, but do not provide for the payment
of current interest (for the amount of Zero Coupon Bonds in each Trust, and the
cost of such Bonds to that Trust, see "Description of Portfolio" in this Part
A). The payment of interest and preservation of capital are, of course,
dependent upon the continuing ability of the issuers of the Bonds or the insurer
thereof to meet their obligations.

                  Investment in the Trust should be made with an understanding
of the risks which an investment in long-term fixed rate debt obligations may
entail, including the risk that the value of the underlying portfolio will
decline with increases in interest rates, and that the value of Zero Coupon
Bonds is subject to greater fluctuation than coupon bonds in response to such
changes in interest rates. A Trust designated as a long-term trust must have a
dollar-weighted average portfolio maturity of more than ten years.

                  Each Unit in the Trust represents a 1/3327th undivided
interest in the principal and net income of the Trust. The principal amount of
Bonds deposited in the Trust per Unit is reflected in the Summary of Essential
Information. (See "Organization" in Part B of this Prospectus.) The Units being
offered hereby are issued and outstanding Units which have been purchased by the
Sponsors in the secondary market.

                  INSURANCE. Each of the Bonds in the New York Navigator Trust
is insured by a municipal bond guaranty insurance policy obtained by the
Sponsors (the "Navigator Sponsor-Insured Bonds") from MBIA Insurance Corporation
("MBIA Corp.") covering regularly scheduled payments of principal thereof and
interest thereon when such amounts become due for payment but shall not have
been paid. For discussion of the effect of an occurrence of non-payment of
principal or interest on any Bonds in the New York Navigator Trust see
"Portfolio Supervision" in Part B of this Prospectus. The premiums for the
Navigator Sponsor-Insured Bonds are obligations of the Sponsors. Additionally,
some of the Bonds in the New York Navigator Trust may be Pre- Insured Bonds (as
described below). The premium for the Pre-Insured Bonds is an obligation of the
issuers, underwriters or prior owners of those Bonds. The insurance policy or
policies relating to the Navigator Sponsor-Insured Bonds provides that, to the
extent that Bonds are both Pre-Insured Bonds and Navigator Sponsor-Insured
Bonds, coverage is effective after a claim has been made upon the insurer of the
Pre-Insured Bonds.

                  Some of the Bonds in the New York Navigator Trust may
additionally be insured by a municipal bond guaranty insurance policy obtained
by issuers, underwriters or prior owners of the Bonds ("Pre-Insured Bonds") and
issued by one of the insurance companies described under "Insurance on the
Bonds" in Part B of this Prospectus (the "Insurance Companies").

                  None of the insurance will cover accelerated payments of
principal or penalty interest or premiums unrelated to taxability of interest on
the Bonds. The insurance relates only to the prompt payment of principal of and
interest on the securities in the portfolios, and does not remove market risks
nor does it guarantee the market value of Units in the Trusts. The terms of the
insurance are more fully described herein. No representation is made herein as
to any Bond insurer's ability to meet its obligations under a policy of
insurance relating to any of the Pre-Insured Bonds. In addition, investors
should be aware that subsequent to the Date of Deposit the rating of the
claims-paying ability of the insurer of an underlying Pre-Insured Bond may be
downgraded.

                 All of the Bonds in the New York Navigator Trust are covered by
insurance obtained by the Sponsors from MBIA Corp. and 42.7% of the Bonds in
    

                                       A-2

109758.1

<PAGE>



   
the New York Navigator Trust are Pre-Insured Bonds.  The approximate
percentage of the aggregate principal amount of the Portfolio that is insured
by each Insurance Company with respect to Pre-Insured Bonds is as follows:
AMBAC Indemnity Corp. ("AMBAC"), 15.1%; Bond Investor Guaranty ("BIG"), 15.1%;
Financial Security Assurance Inc. ("Financial Security"), 7.7%; and MBIA
Corp., 4.8%.

                  PUBLIC OFFERING PRICE. The secondary market Public Offering
Price of each Unit is equal to the aggregate offering price of the Bonds in such
Trust divided by the number of Units outstanding, plus a sales charge of 3.4% of
the Public Offering Price, or 3.539% of the net amount invested in Bonds per
Unit. In addition, accrued interest to the expected date of settlement is added
to the Public Offering Price. If Units had been purchased on the Evaluation
Date, the Public Offering Price per Unit would have been $1,082.76 plus accrued
interest of $10.26 under the monthly distribution plan, $15.94 under the
semi-annual distribution plan and $15.97 under the annual distribution plan, for
a total of $1,093.02, $1,098.70 and $1,098.73, respectively. The Public Offering
Price per Unit can vary on a daily basis in accordance with fluctuations in the
aggregate bid price of the Bonds. (See "Public Offering--Offering Price" in Part
B of this Prospectus.)

                  ESTIMATED LONG TERM RETURN AND ESTIMATED CURRENT RETURN. Units
of each Trust are offered to investors on a "dollar price" basis (using the
computation method described under "Public Offering--Offering Price" in Part B)
as distinguished from a "yield price" basis often used in offerings of tax
exempt bonds (involving the lesser of the yield as computed to maturity of bonds
or to an earlier redemption date). Since they are offered on a dollar price
basis, the rate of return on an investment in Units of each Trust is measured in
terms of "Estimated Current Return" and "Estimated Long Term Return".
    

                  Estimated Long Term Return is calculated by: (1) computing the
yield to maturity or to an earlier call date (whichever results in a lower
yield) for each Bond in the Trust's portfolio in accordance with accepted bond
practices, which practices take into account not only the interest payable on
the Bond but also the amortization of premiums or accretion of discounts, if
any; (2) calculating the average of the yields for the Bonds in the Trust's
portfolio by weighing each Bond's yield by the market value of the Bond and by
the amount of time remaining to the date to which the Bond is priced (thus
creating an average yield for the portfolio of the Trust); and (3) reducing the
average yield for the portfolio of the Trust in order to reflect estimated fees
and expenses of the Trust and the maximum sales charge paid by investors. The
resulting Estimated Long Term Return represents a measure of the return to
investors earned over the estimated life of the Trust. (For the Estimated Long
Term Return to Certificateholders under the monthly, semi-annual and annual
distribution plans, see "Summary of Essential Information".)

                  Estimated Current Return is a measure of the Trust's cash
flow. Estimated Current Return is computed by dividing the Estimated Net Annual
Interest Income per Unit by the Public Offering Price per Unit. In contrast to
the Estimated Long Term Return, the Estimated Current Return does not take into
account the amortization of premium or accretion of discount, if any, on the
Bonds in the portfolio of the Trust. Moreover, because interest rates on Bonds
purchased at a premium are generally higher than current interest rates on newly
issued bonds of a similar type with comparable rating, the Estimated Current
Return per Unit may be affected adversely if such Bonds are redeemed prior to
their maturity.

                  The Estimated Net Annual Interest Income per Unit of the Trust
will vary with changes in the fees and expenses of the Trustee and the Evaluator
applicable to the Trust and with the redemption, maturity, sale or

                                       A-3

109758.1

<PAGE>



other disposition of the Bonds in the Trust. The Public Offering Price will vary
with changes in the bid prices of the Bonds. Therefore, there is no assurance
that the present Estimated Current Return or Estimated Long Term Return will be
realized in the future. (For the Estimated Current Return to Certificateholders
under the monthly, semi-annual and annual distribution plans, see "Summary of
Essential Information". See "Estimated Long Term Return and Estimated Current
Return" in Part B of this Prospectus.)

                  A schedule of cash flow projections is available from the
Sponsors upon request.

                  DISTRIBUTIONS. Distributions of interest income, less
expenses, will be made by the Trust either monthly, semi-annually or annually
depending upon the plan chosen by the Certificateholder. Certificateholders
purchasing Units in the secondary market will initially receive distributions in
accordance with the elections of the prior owner and may thereafter change the
plan as provided under "Interest and Principal Distributions" in Part B of this
Prospectus. Distributions of principal, if any, will be made semi-annually on
June 15 and December 15 of each year. (See "Rights of
Certificateholders--Interest and Principal Distributions" in Part B of this
Prospectus. For estimated monthly, semi-annual and annual interest
distributions, see "Summary of Essential Information.")

   
                  MARKET FOR UNITS. The Sponsors, although not obligated to do
so, presently maintain and intend to continue to maintain a secondary market for
the Units at a price based on the aggregate bid price of the Bonds in the Trust
portfolio. The reoffer price will be based on the aggregate bid price of the
Bonds plus a sales charge of 3.4% of the Public Offering Price (3.539% of the
net amount invested), plus net accrued interest. If a market is not maintained a
Certificateholder will be able to redeem his or her Units with the Trustee at a
price based on the aggregate bid price of the Bonds. (See "Sponsor Repurchase"
and "Public Offering--Offering Price" in Part B of this Prospectus.)
    

                  TOTAL REINVESTMENT PLAN. Certificateholders under the
semi-annual and annual plans of distribution have the opportunity to have all
their regular interest distributions, and principal distributions, if any,
reinvested in available series of "Insured Municipal Securities Trust" or
"Municipal Securities Trust." (See "Total Reinvestment Plan" in Part B of this
Prospectus. Residents of Texas see "Total Reinvestment Plan for Texas Residents"
in Part B of this Prospectus.) The Plan is not designed to be a complete
investment program.

                                       A-4

109758.1

<PAGE>



                       INSURED MUNICIPAL SECURITIES TRUST
                           NEW YORK NAVIGATOR INSURED
                                    SERIES 6
<TABLE>
<CAPTION>

   
            SUMMARY OF ESSENTIAL INFORMATION AS OF DECEMBER 31, 1996


Date of Deposit:  January 31, 1991                                 Weighted Average Life to
- ---------------                                                    ------------------------
<S>                                          <C>                               <C>        
Principal Amount of Bonds ...                $3,310,000             Maturity:  10.9 Years.
- -------------------------                                           --------
Number of Units .............                3,327                 Minimum Value of Trust: Trust
- ---------------                                                    ----------------------
Fractional Undivided Inter-                                           may be terminated if value of
- --------------------------
  est in Trust per Unit .....                1/3327                   Trust is less than $1,600,000
  ---------------------
Principal Amount of                                                   in principal amount of Bonds.
- -------------------
  Bonds per Unit ............                $994.89               Mandatory Termination Date:
  --------------                                                   --------------------------
Secondary Market Public                                               The earlier of December 31,
- -----------------------
  Offering Price**                                                    2040 or the disposition of the
  Aggregate Bid Price                                                 last Bond in the Trust.
    of Bonds in Trust .......                $3,479,214+++         Trustee***:  The Chase Manhattan
                                                                   -------
  Divided by 3,327 Units ....                $1,045.75                Bank.
  Plus Sales Charge of 3.4%                                        Trustee's Annual Fee:  Monthly
                                                                   --------------------
    of Public Offering Price.                $37.01                   plan $1.09 per $1,000; semi-
  Public Offering Price                                               annual plan $.64 per $1,000;
    per Unit ................                $1,082.76+               and annual plan is $.39 per
Redemption and Sponsors'                                              $1,000.
- ------------------------
  Repurchase Price                                                 Evaluator:  Kenny S&P Evaluation
  ----------------                                                 ---------
  per Unit ..................                $1,045.75+               Services.
  --------
                                        +++                        Evaluator's Fee for Each
                                        ++++                          Evaluation:  Minimum of $8
Excess of Secondary Market                                            plus $.25 per each issue of
- --------------------------
  Public Offering Price                                               Bonds in excess of 50 issues
  ---------------------
  over Redemption and                                                 (treating separate maturities
  -------------------
  Sponsors' Repurchase                                                as separate issues).
  --------------------
  Price per Unit ............                $37.01++++            Sponsors:  Reich & Tang
  --------------                                                   --------
Difference between Public                                             Distributors L.P. and Gruntal
  Offering Price per Unit                                             & Co., L.L.C.
  and Principal Amount per                                         Sponsors' Annual Fee:  Maximum
  Unit Premium/(Discount) ...                $87.87                   of $.25 per $1,000 principal
  -----------------------
Evaluation Time:  4:00 p.m.                                           amount of Bonds (see "Trust
- ---------------
  New York Time.                                                      Expenses and Charges" in
Minimum Principal Distribution:                                       Part B of this Prospectus).
  $1.00 per Unit.
    

</TABLE>


       PER UNIT INFORMATION BASED UPON INTEREST DISTRIBUTION PLAN ELECTED
<TABLE>
<CAPTION>

   
                                                             Monthly          Semi-Annual            Annual
                                                             Option             Option               Option

<S>                                                            <C>                  <C>                  <C>   
Gross annual interest income# .........                        $70.13               $70.13               $70.13
Less estimated annual fees and
  expenses ............................                          2.41                 1.92                 1.66
Estimated net annual interest                                  ______               ______               ______
  income (cash)# ......................                        $67.72               $68.21               $68.47
Estimated interest distribution# ......                          5.64                34.10                68.47
Estimated daily interest accrual# .....                         .1881                .1894                .1901
Estimated current return#++ ...........                         6.25%                6.30%                6.32%
Estimated long term return++ ..........                         4.01%                4.05%                4.08%
    

Record dates ..........................                      1st of           Dec. 1 and             Dec. 1
                                                             each month       June 1
Interest distribution dates ...........                      15th of          Dec. 15 and            Dec. 15
                                                             each month       June 15
</TABLE>

                                       A-5

109758.1

<PAGE>



                  Footnotes to Summary of Essential Information


   *    The Date of Deposit is the date on which the Trust Agreement was signed
        and the deposit of the Bonds with the Trustee made.

  **    For information regarding offering price per Unit and applicable sales
        charge under the Total Reinvestment Plan, see "Total Reinvestment Plan"
        in Part B of this Prospectus.

   
 ***    The Trustee maintains its principal executive office at 270 Park
        Avenue, New York, New York 10017 and its unit investment trust office
        at 4 New York Plaza, New York, New York 10004 (tel. no.:
        1-800-882-9898). For information regarding redemption by the Trustee,
        see "Trustee Redemption" in Part B of this Prospectus.

   +    Plus accrued interest to the expected date of settlement (approximately
        three business days after purchase) of $10.26 monthly, $15.94
        semi-annually and $15.97 annually.
    

  ++    The estimated current return and estimated long term return are
        increased for transactions entitled to a discount (see "Employee
        Discounts" in Part B of this Prospectus), and are higher under the
        semi-annual and annual options due to lower Trustee's fees and
        expenses.

 +++    Based solely upon the bid side evaluation of the underlying Bonds
        (including, where applicable, undistributed cash from the principal
        account). Upon tender for redemption, the price to be paid will be
        calculated as described under "Trustee Redemption" in Part B of this
        Prospectus.

++++    See "Comparison of Public Offering Price, Sponsor's Repurchase Price and
        Redemption Price" in Part B of this Prospectus.

   #    Does not include income accrual from original issue discount bonds, if
        any.


   
                     FINANCIAL AND STATISTICAL INFORMATION


Selected data for each Unit outstanding for the periods listed below:
<TABLE>
<CAPTION>

                                                                                                    Distribu-
                                                                                                    tions of
                                                           Distributions of Interest                Principal
                                                          During the Period (per Unit)               During
                                         Net Asset*                       Semi-                       the
                         Units Out-        Value          Monthly         Annual          Annual     Period
Period Ended              standing        Per Unit        Option          Option          Option    (Per Unit)
- ------------             ----------      ----------       -------         ------          ------    ----------
    

<S>      <C> <C>                <C>         <C>             <C>             <C>              <C>              <C>
December 31, 1994               3,545       $1,032.82       $69.78          $70.43           $70.70          -0-
December 31, 1995               3,443        1,089.59        70.48           71.08            71.35          -0-
December 31, 1996               3,327        1,060.54        67.95           68.49            68.72          -0-
</TABLE>

   
- --------
*        Net Asset Value per Unit is calculated by dividing net assets as
         disclosed in the "Statement of Net Assets" by the number of Units
         outstanding as of the date of the Statement of Net Assets. See Note 5
         of Notes to Financial Statements for a description of the components of
         Net Assets.
    

                                       A-6

109758.1

<PAGE>


   
                         INFORMATION REGARDING THE TRUST
                             AS OF DECEMBER 31, 1996


DESCRIPTION OF PORTFOLIO

                  The portfolio of the Trust consists of 10 issues representing
obligations of 9 issuers located in the State of New York and in Puerto Rico.
The Sponsors have not participated as a sole underwriter or manager, co- manager
or member of an underwriting syndicate from which any of the initial aggregate
principal amount of the Bonds were acquired. Approximately 4.8% of the Bonds are
obligations of state and local housing authorities; approximately 21.1% are
hospital revenue bonds; none were issued in connection with the financing of
nuclear generating facilities; and none are "mortgage subsidy" bonds. All of the
Bonds in the Trust are subject to redemption prior to their stated maturity
dates pursuant to sinking fund or optional call provisions. The Bonds may also
be subject to other calls, which may be permitted or required by events which
cannot be predicted (such as destruction, condemnation, termination of a
contract, or receipt of excess or unanticipated revenues). Two of the issues
representing $525,000 of the principal amount of the Bonds are general
obligation bonds. All 8 of the remaining issues representing $2,785,000 of the
principal amount of the Bonds are payable from the income of a specific project
or authority and are not supported by the issuer's power to levy taxes. The
portfolio is divided for purpose of issue as follows: Convention Center 1,
Correctional Facility 1, Hospital 2, Single Family Mortgage Revenue 1,
University 1 and Water 2. For an explanation of the significance of these
factors see "The Trust--Portfolio" in Part B of this Prospectus.

                  As of December 31, 1996, $415,000 (approximately 12.5% of the
aggregate principal amount of the Bonds) were original issue discount bonds. Of
these original issue discount bonds, $160,000 (approximately 4.8% of the
aggregate principal amount of the Bonds) were Zero Coupon Bonds. Zero Coupon
Bonds do not provide for the payment of any current interest and provide for
payment at maturity at par value unless sooner sold or redeemed. The market
value of Zero Coupon Bonds is subject to greater fluctuations than coupon bonds
in response to changes in interest rates. Approximately 15.1% of the aggregate
principal amount of the Bonds in the Trust were purchased at a "market" discount
from par value at maturity, approximately 57.3% were purchased at a premium and
approximately 15.1% were purchased at par. For an explanation of the
significance of these factors see "Discount and Zero Coupon Bonds" in Part B of
this Prospectus.

                  None of the Bonds in the Trust are subject to the federal
individual alternative minimum tax under the Tax Reform Act of 1986.  See "Tax
Status" in Part B of this Prospectus.
    


                                       A-7

109758.1

<PAGE>

                        Report of Independent Accountants


To the Sponsor, Trustee and Certificateholders of
Insured Municipal Securities Trust, New York Navigator
Insured Series 6

In our opinion, the accompanying statement of net assets, including the
portfolio of investments, and the related statements of operations and of
changes in net assets and the financial highlights present fairly, in all
material respects, the financial position of Insured Municipal Securities Trust,
New York Navigator Insured Series 6 (the "Trust") at December 31, 1996, the
results of its operations, the changes in its net assets and the financial
highlights for the year then ended, in conformity with generally accepted
accounting principles. These financial statements and financial highlights
(hereafter referred to as "financial statements") are the responsibility of the
Trust's management; our responsibility is to express an opinion on these
financial statements based on our audit. We conducted our audit of these
financial statements in accordance with generally accepted auditing standards
which require that we plan and perform the audit to obtain reasonable assurance
about whether the financial statements are free of material misstatement. An
audit includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements, assessing the accounting principles
used and significant estimates made by management, and evaluating the overall
financial statement presentation. We believe that our audit, which included
confirmation of securities at December 31, 1996 by correspondence with the
Trustee, provides a reasonable basis for the opinion expressed above. The
financial statements for the prior periods presented were audited by other
independent accountants whose report dated March 31, 1996 expressed an
unqualified opinion on those financial statements.




PRICE WATERHOUSE LLP
160 Federal Street
Boston, MA 02110
March 28, 1997


<PAGE>

<TABLE>

Insured Municipal Securities Trust,
New York Navigator Insured Series 6
Portfolio
December 31, 1996
- -----------------------------------------------------------------------------------------------------------------------------
<CAPTION>

                                                                                                                             
                   Aggregate                                                                                   Coupon Rate/  
  Portfolio        Principal          Name of Issuer and                                     Ratings            Date(s) of   
     No.            Amount              Title of Bonds                                         (1)             Maturity (2)  
<S>            <C>                 <C>                                                       <C>              <C>

     1         $      500,000      N.Y. State Dorm. Auth. State Univ. Ed. Facs.                AAA            7.700%         
                                   Rev. Bonds Series 1990A (MBIA Corp.)                                       5/15/2012      

     2                500,000      N.Y. State Med. Care (Bronx Lebanon Hosp.)                  AAA            7.100          
                                   Rev. Bonds (MBIA Corp.)                                                    2/15/2027      

     3                200,000      N.Y. State Med. Care Facs. Finc. Agency                     AAA            7.450          
                                   St. Luke's Roosevelt Hosp. Cntr. FHA Insrd.                                2/15/2029      
                                   Mtg. Rev. Bonds Series B (MBIA Corp.)

     4                500,000      N.Y. State Urb. Dev. Corp. Correc. Facs. Rev.               AAA            7.500          
                                   Bonds Series C (MBIA Corp.)                                                1/01/2012      

     5                430,000      N.Y. City Gen. Oblig. Rev. Bonds Fiscal 1991                AAA            8.250          
                                   Series B (MBIA Corp.)                                                      6/01/2018      

     6                255,000      N.Y. City Muni. Wtr. Finc. Auth. Wtr. & Swr. Sys.           AAA            6.000          
                                   Rev. Bonds Series A (MBIA Corp.)                                           6/15/2020      

     7                170,000      N.Y. City Muni. Wtr. Finc. Auth. Wtr. & Swr. Sys.           AAA            7.625          
                                   Rev. Bonds Fiscal 1989 Series A (MBIA Corp.)                               6/15/2016      

     8                500,000      Triborough Bridge & Tunnel Auth. of N.Y. Convntn.           AAA            7.250
                                   Cntr. Prjt. Bonds Series E (MBIA Corp.)                                    1/01/2010      

     9                 95,000      Commnwlth of P.R. Pub. Imprvmnt. Bonds of 1991              AAA            7.300
                                   Gen. Oblig. Rev. Bonds (MBIA Corp.)                                        7/01/2020      

    10                160,000      N.Y. State Mtg. Agncy. Hmownr. Mtg. Rev. Bonds              AAA            0.000          
                                   Series II (MBIA Corp.)                                                     4/01/2020      
               --------------
                                                                                                                             

               $    3,310,000      Total Investments (Cost $3,206,959)                                                       
               --------------
               --------------
</TABLE>


                       Redemption
                     Feature (2)(4)
  Portfolio         S.F.-Sinking Fund            Market
     No.             Ref.-Refunding             Value (3)

     1         $ 5/15/06 @ 100 S.F.        $          562,135
                 5/15/00 @ 102 Ref.

     2           8/15/02 @ 100 S.F.                   511,765
                 2/15/97 @ 102 Ref.

     3           2/15/98 @ 100 S.F.                   221,880
                 2/15/00 @ 102 Ref.
                

     4           1/01/04 @ 100 S.F.                   528,530
                 1/01/98 @ 102 Ref.

     5           No Sinking Fund                      500,623
                 6/01/01 @ 101.5 Ref.

     6           No Sinking Fund                      258,715
                 6/15/00 @ 100 Ref.

     7           6//15/09 @ 100 S.F.                  175,670
                 6/15/97 @ 101.5 Ref.

     8           1/01/04 @ 100 S.F.                   594,935
                 None

     9           7/01/11 @ 100 S.F.                   106,334
                 7/01/00 @ 102 Ref.

    10           4/01/12 @ 52.88 S.F.                  25,338
                 4/01/02 @ 23.845 Ref.
                                           ------------------

                                           $        3,485,925
                                           ------------------
                                           ------------------


   See accompanying footnotes to portfolio and notes to financial statements.

<PAGE>


Insured Municipal Securities Trust,
New York Navigator Insured Series 6
Footnotes to Portfolio
- --------------------------------------------------------------------------------

1.       All ratings are by Kenny S&P Evaluation Services, a business unit of
         J.J. Kenny Company, Inc., a subsidiary of The McGraw-Hill Companies,
         Inc. A brief description of the ratings symbols and their meaning is
         set forth under "Description of Bond Ratings" in Part B of the
         Prospectus.

2.       See "The Trust - Portfolio" in Part B of the Prospectus for an
         explanation of redemption features. See "Tax Status" in Part B of the
         Prospectus for a statement of the Federal tax consequences to a
         Certificateholder upon the sale, redemption or maturity of a bond.

3.       At December 31, 1996, the net unrealized appreciation of all the bonds
         was comprised of the following:

               Gross unrealized appreciation         $         281,147
               Gross unrealized depreciation                    (2,181)
                                                     ------------------


               Net unrealized appreciation           $         278,966
                                                     ------------------
                                                     ------------------

4.       The Bonds may also be subject to other calls, which may be permitted or
         required by events which cannot be predicted (such as destruction,
         condemnation, termination of a contract, or receipt of excess or
         unanticipated revenues).






   The accompanying notes form an integral part of the financial statements.

<PAGE>

Insured Municipal Securities Trust,
New York Navigator Insured Series 6
Statement of Net Assets
December 31, 1996
- --------------------------------------------------------------------------------
Investments in Securities,
     at Market Value (Cost $3,206,959)            $    3,485,925
                                                  --------------

Other Assets
     Accrued Interest                                     68,514
                                                  --------------
         Total Other Assets                               68,514
                                                  --------------

Liabilities
     Accrued Expenses                                      1,027
     Advance from Trustee                                 24,995
                                                  --------------
         Total Liabilities                                26,022
                                                  --------------

Excess of Other Assets over Total Liabilities             42,492
                                                  --------------

Net Assets (3,327 Units of Fractional Undivided
     Interest Outstanding, $1,060.54 per Unit)    $    3,528,417
                                                  --------------
                                                  --------------




   The accompanying notes form an integral part of the financial statements.



<PAGE>
<TABLE>

Insured Municipal Securities Trust,
New York Navigator Insured Series 6
Statement of Operations
- --------------------------------------------------------------------------------------------------------------------
<CAPTION>

                                                                           For the Years Ended December 31,
                                                               1996                       1995                  1994
<S>                                                     <C>                        <C>                    <C>

Investment Income
     Interest                                           $   239,466                $   251,980            $  265,910
                                                        -----------                -----------            ----------

Expenses
     Trustee's Fees                                           4,996                      4,674                 4,909
     Evaluator's Fees                                         2,373                      2,000                 2,204
     Sponsers Advisory Fee                                      855                        885                   975
                                                        -----------                -----------            ----------

         Total Expenses                                       8,224                      7,559                 8,088
                                                        -----------                -----------            ----------

     Net Investment Income                                  231,242                    244,421               257,822
                                                        -----------                -----------            ----------

Realized and Unrealized Gain (Loss)
     Realized Gain (Loss) on
         Investments                                           (468)                    (5,260)                3,371

     Change in Unrealized Appreciation
         (Depreciation) on Investments                      (99,506)                   210,434              (391,930)
                                                        -----------                -----------            ----------

     Net Gain (Loss) on Investments                         (99,974)                   205,174              (388,559)
                                                        -----------                -----------            ----------

     Net Increase (Decrease)
         in Net Assets
         Resulting From Operations                      $   131,268                $   449,595            $ (130,737)
                                                        -----------                -----------            ----------
                                                        -----------                -----------            ----------
</TABLE>









   The accompanying notes form an integral part of the financial statements.



<PAGE>

<TABLE>


Insured Municipal Securities Trust,
New York Navigator Insured Series 6
Statement of Changes in Net Assets
- --------------------------------------------------------------------------------------------------------------------
<CAPTION>

                                                                           For the Years Ended December 31,
                                                                  1996                    1995                  1994
<S>                                                      <C>                     <C>                   <C>

Operations
Net Investment Income                                    $     231,242           $     244,421         $     257,822
Realized Gain (Loss)
     on Investments                                               (468)                 (5,260)                3,371
Change in Unrealized Appreciation
     (Depreciation) on Investments                             (99,506)                210,434              (391,930)
                                                         -------------           -------------         -------------

          Net Increase (Decrease) in
                Net Assets Resulting
                From Operations                                131,268                 449,595              (130,737)
                                                         -------------           -------------         -------------

Distributions to Certificateholders
     Investment Income                                         230,379                 249,149               246,650

Redemptions
     Interest                                                    2,228                   1,532                13,854
     Principal                                                 121,992                 108,496               366,948
                                                         -------------           -------------         -------------

         Total Distributions
             and Redemptions                                   354,599                 359,177               627,452
                                                         -------------           -------------         -------------


         Total Increase (Decrease)                            (223,331)                 90,418              (758,189)


Net Assets
     Beginning of Year                                       3,751,748               3,661,330             4,419,519
                                                         -------------           -------------         -------------

     End of Year (Including
         Undistributed Net Investment
         Income of $59,764, $61,129
         and $67,389, Respectively)                       $  3,528,417            $  3,751,748          $  3,661,330
                                                         -------------           -------------         -------------
                                                         -------------           -------------         -------------

</TABLE>




   The accompanying notes form an integral part of the financial statements.



<PAGE>



Insured Municipal Securities Trust,
New York Navigator Insured Series 6
Notes to Financial Statements
- --------------------------------------------------------------------------------
1.       Organization

         Insured Municipal Securities Trust, New York Navigator Insured Series 6
         (the "Trust") was organized on January 31, 1991 by Bear, Stearns & Co.
         Inc. and Gruntal & Co., Incorporated under the laws of the State of New
         York by a Trust Indenture and Agreement, and is registered under the
         Investment Company Act of 1940. The Trust was formed to preserve
         capital and to provide interest income.

         Effective September 28, 1995, Reich & Tang Distributors L.P. ("Reich &
         Tang") has become the successor sponsor (the "Sponsor") to certain of
         the unit investment trusts previously sponsored by Bear, Stearns & Co.
         Inc. As successor Sponsor, Reich & Tang has assumed all of the
         obligations and rights of Bear, Stearns & Co. Inc., the previous
         sponsor. Effective September 2, 1995, United States Trust Company of
         New York was merged into The Chase Manhattan Bank (the Trustee).
         Accordingly, Chase is the successor trustee of the Trust.

2.       Summary of Significant Accounting Policies

         The following is a summary of significant accounting policies
         consistently followed by the Trust in preparation of its financial
         statements. The policies are in conformity with generally accepted
         accounting principles ("GAAP"). The preparation of financial statements
         in accordance with GAAP requires management to make estimates and
         assumptions that affect the reported amounts and disclosures in the
         financial statements. Actual amounts could differ from those estimates.

         Interest Income
         Interest income is recorded on the accrual basis. The discount on the
         zero-coupon bonds is accreted by the interest method over the
         respective lives of the bonds. The accretion of such discount is
         included in interest income; however, it is not distributed until
         realized in cash upon maturity or sale of the respective bonds.

         Security Valuation
         Investments are carried at market value which is determined by Kenny
         S&P Evaluation Services, a business unit of J.J. Kenny Company, Inc., a
         subsidiary of The McGraw-Hill Companies, Inc. The market value of the
         portfolio is based upon the bid prices for the bonds at the end of the
         year, which approximates the fair value of the security at that date,
         except that the market value on the date of deposit represents the cost
         to the Trust based on the offering prices for investments at that date.
         The difference between cost (including accumulated accretion of
         original issue discount on zero-coupon bonds) and market value is
         reflected as unrealized appreciation (depreciation) of investments.
         Securities transactions are recorded on the trade date. Realized gains
         (losses) from securities transactions are determined on the basis of
         average cost of the securities sold or redeemed.


<PAGE>



Insured Municipal Securities Trust,
New York Navigator Insured Series 6
Notes to Financial Statements
- --------------------------------------------------------------------------------
3.       Income Taxes

         No provision for federal income taxes has been made in the accompanying
         financial statements because the Trust intends to continue to qualify
         for the tax treatment applicable to Grantor Trusts under the Internal
         Revenue Code. Under existing law, if the Trust so qualifies, it will
         not be subject to federal income tax on net income and capital gains
         that are distributed to unitholders.

4.       Trust Administration

         The Trustee has custody of assets and responsibility for the accounting
         records and financial statements of the Trust and is responsible for
         establishing and maintaining a system of internal control related
         thereto. The Trustee is also responsible for all estimates of expenses
         and accruals reflected in the Trust's financial statements.

         The Trust Indenture and Agreement provides for interest distributions
         as often as monthly (depending upon the distribution plan elected by
         the Certificateholders).

         The Trust Indenture and Agreement further requires that principal
         received from the disposition of bonds, other than those bonds sold in
         connection with the redemption of units, be distributed to
         Certificateholders.

         The Trust Indenture and Agreement also requires the Trust to redeem
         units tendered. For the years ended December 31, 1996, 1995 and 1994,
         116, 102 and 350 units were redeemed, respectively.

         The Trust pays an annual fee for trustee services rendered by the
         Trustee that ranges from $.39 to $1.09 per $1,000 of outstanding
         investment principal. In addition, a minimum fee of $8.00 is paid to a
         service bureau for each portfolio valuation. A maximum fee of $.25 per
         $1,000 of outstanding investment principal is paid to the Sponsor. For
         the year ended December 31, 1996, the "Trustee's Fees" are comprised of
         Trustee fees of $3,118 and other expenses of $1,878. The other expenses
         include professional, printing and miscellaneous fees.


<PAGE>



Insured Municipal Securities Trust,
New York Navigator Insured Series 6
Notes to Financial Statements
- --------------------------------------------------------------------------------
5.       Net Assets

         At December 31, 1996, the net assets of the Trust represented the
         interest of Certificateholders as follows:

           Original cost to Certificateholders           $     4,094,930
           Less Initial Gross Underwriting Commission            200,652
                                                         ---------------
                                                               3,894,278
           Accumulated Cost of Securities Sold,
              Matured or Called                                 (697,881)
           Net Unrealized Appreciation                           278,966
           Undistributed Net Investment Income                    59,764
           Undistributed Proceeds From Investments                (6,710)
                                                         ----------------

              Total                                      $     3,528,417
                                                         ---------------
                                                         ---------------

         The original cost to Certificateholders, less the initial gross
         underwriting commission, represents the aggregate initial public
         offering price net of the applicable sales charge on 4,000 units of
         fractional undivided interest of the Trust as of the date of deposit.

         Undistributed net investment income includes accumulated accretion of
         original issue discount of $10,562.

6.       Concentration of Credit Risk

         Since the Trust invests a portion of its assets in municipal bonds, it
         may be affected by economic and political developments in the
         municipalities. Certain debt obligations held by the Trust may be
         entitled to the benefit of insurance, standby letters of credit or
         other guarantees of banks or other financial institutions.


<PAGE>



Insured Municipal Securities Trust,
New York Navigator Insured Series 6
Notes to Financial Statements
- --------------------------------------------------------------------------------
7.       Financial Highlights (per unit)*

         Selected data for a unit of the Trust outstanding for the year ended
         December 31, 1996:

         Net Asset Value, Beginning of Year**        $     1,089.67
                                                     --------------

             Interest Income                                  70.74
             Expenses                                         (2.43)
                                                     --------------
             Net Investment Income                            68.31
                                                     --------------
             Net Gain or Loss on Investments(1)              (28.72)
                                                     --------------

         Total from Investment Operations                     39.59
                                                     --------------

         Less Distributions
             to Certificateholders
                 Income                                       68.06
             for Redemptions
                 Interest                                       .66
                                                     --------------

         Total Distributions                                  68.72
                                                     --------------

         Net Asset Value, End of Year**              $     1,060.54
                                                     --------------
                                                     --------------

         See "Financial and Statistical Information" in Part A of this
         Prospectus for amounts of per unit distributions during the years ended
         December 31, 1996, 1995 and 1994 based on actual units.

(1)      Net gain or loss on investments is a result of changes in outstanding
         units since January 1, 1996 and the dates of net gain and loss on
         investments.


- ---------------------
     *   Unless otherwise stated, based upon average units outstanding during
         the year of 3,385 ([3,327 + 3,443]/2).

     **  Based upon actual units outstanding.

<PAGE>

   
                     Prospectus Part A Dated April 30, 1997
    


                       INSURED MUNICIPAL SECURITIES TRUST
                          NEW JERSEY NAVIGATOR INSURED

                                    SERIES 3


   
                  The Trust is a unit investment trust designated Series 3 ("New
Jersey Navigator Trust") with an underlying portfolio of long-term insured
tax-exempt bonds issued by or on behalf of states, municipalities and public
authorities and was formed to preserve capital and to provide interest income
(including, where applicable, earned original issue discount) which, in the
opinions of bond counsel to the respective issuers, is, with certain exceptions,
currently exempt from regular federal income tax under existing law and from New
Jersey gross income tax. There can be no assurance that the Trust's investment
objectives will be achieved. Although the Supreme Court has determined that
Congress has the authority to subject the interest on bonds such as the Bonds in
the Trust to regular federal income taxation, existing law excludes such
interest from regular federal income tax. Such interest income may, however, be
a specific preference item for purposes of the federal individual and/or
corporate alternative minimum tax. (See "Description of Portfolio" in this Part
A for a list of these Bonds which pay interest income subject to the federal
individual alternative minimum tax.) In addition, capital gains are subject to
tax. (See "Tax Status" and "The Trust--Portfolio" in Part B of this Prospectus.)
The Sponsors are Reich & Tang Distributors L.P. and Gruntal & Co., L.L.C.
(sometimes referred to as the "Sponsor" or the "Sponsors"). The value of the
Units of the Trust will fluctuate with the value of the underlying bonds.
Minimum purchase: 1 Unit.

                  This Prospectus consists of two parts. Part A contains the
Summary of Essential Information as of December 31, 1996 (the "Evaluation
Date"), a summary of certain specific information regarding the Trust and
audited financial statements of the Trust, including the related portfolio, as
of the Evaluation Date. Part B of this Prospectus contains a general summary of
the Trust. Part A of this Prospectus may not be distributed unless accompanied
by Part B. Investors should retain both parts of this Prospectus for future
reference.
    

         THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
         SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
         NOR HAS THE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON
         THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
         CONTRARY IS A CRIMINAL OFFENSE.

- --------------------------------------------------------------------------------

   
                  THE TRUST. The Trust seeks to achieve its investment
objectives through investment in a fixed, diversified portfolio of long-term
insured bonds (the "Bonds") issued by or on behalf of states, municipalities and
public authorities which, because of irrevocable insurance, were rated "AAA" by
Standard & Poor's Corporation. All of the Bonds in the Trust were rated "AAA" by
Standard & Poor's Corporation at the time originally deposited in the Trust (see
"Portfolio"). This rating results from insurance relating only to the Bonds in
the Trust and not to Units of the Trust. The insurance does not remove market
risk, as it does not guarantee the market value of the Units. For a discussion
of the significance of such ratings, see "Description of Bond Ratings" in Part B
of this Prospectus. Some of the aggregate principal amount
    

                                       A-1
110242.1

<PAGE>



   
of the Bonds in the Trust may be "Zero Coupon Bonds," which are original issue
discount bonds that provide for payment at maturity at par value, but do not
provide for the payment of current interest (for the amount of Zero Coupon Bonds
in the Trust, and the cost of such Bonds to the Trust, see "Description of
Portfolio" in this Part A). The payment of interest and preservation of capital
are, of course, dependent upon the continuing ability of the issuers of the
Bonds or the insurer thereof to meet their obligations.

                  Investment in the Trust should be made with an understanding
of the risks which an investment in long-term fixed rate debt obligations may
entail, including the risk that the value of the underlying portfolio will
decline with increases in interest rates, and that the value of Zero Coupon
Bonds is subject to greater fluctuation than coupon bonds in response to such
changes in interest rates. A Trust designated as a long-term trust must have a
dollar-weighted average portfolio maturity of more than ten years.

                  Each Unit in the Trust represents a 1/3349th undivided
interest in the principal and net income of the Trust. The principal amount of
Bonds deposited in the Trust per Unit is reflected in the Summary of Essential
Information. (See "Organization" in Part B of this Prospectus.) The Units being
offered hereby are issued and outstanding Units which have been purchased by the
Sponsors in the secondary market.

                  INSURANCE. Each of the Bonds in the New Jersey Navigator Trust
is insured by a municipal bond guaranty insurance policy obtained by the
Sponsors (the "Navigator Sponsor-Insured Bonds") from MBIA Insurance Corporation
("MBIA Corp.") covering regularly scheduled payments of principal thereof and
interest thereon when such amounts become due for payment but shall not have
been paid. For discussion of the effect of an occurrence of non-payment of
principal or interest on any Bonds in the New Jersey Navigator Trust see
"Portfolio Supervision" in Part B of this Prospectus. The premiums for the
Navigator Sponsor-Insured Bonds are obligations of the Sponsors. Additionally,
some of the Bonds in the New Jersey Navigator Trust may be PreInsured Bonds (as
described below). The premium for the Pre-Insured Bonds is an obligation of the
issuers, underwriters or prior owners of those Bonds. The insurance policy or
policies relating to the Navigator Sponsor-Insured Bonds provides that, to the
extent that Bonds are both Pre-Insured Bonds and Navigator Sponsor-Insured
Bonds, coverage is effective after a claim has been made upon the insurer of the
Pre-Insured Bonds.

                  Some of the Bonds in the New Jersey Navigator Trust may
additionally be insured by a municipal bond guaranty insurance policy obtained
by issuers, underwriters or prior owners of the Bonds ("Pre-Insured Bonds") and
issued by one of the insurance companies described under "Insurance on the
Bonds" in Part B of this Prospectus (the "Insurance Companies"). Such insurance
covers the scheduled payment of principal thereof and interest thereon when such
amounts shall become due for payment but shall not have been paid by the issuer
or any other insurer thereof.
    

                  None of the insurance will cover accelerated payments of
principal or penalty interest or premiums unrelated to taxability of interest on
the Bonds. The insurance relates only to the prompt payment of principal of and
interest on the securities in the portfolios, and does not remove market risks
nor does it guarantee the market value of Units in the Trusts. The terms of the
insurance are more fully described under "Insurance on the Bonds" in Part B of
this Prospectus. No representation is made herein as to any Bond insurer's
ability to meet its obligations under a policy of insurance relating to any of
the Pre-Insured Bonds. In addition, investors should be aware that subsequent to
the Date of Deposit the rating of the claims-paying ability of the insurer of an
underlying Pre-Insured Bond may be downgraded.


                                       A-2
110242.1

<PAGE>



   
                  All of the Bonds in the New Jersey Navigator Trust are covered
by insurance obtained by the Sponsors from MBIA Corp. and 63.8% of the Bonds in
the New Jersey Navigator Trust are Pre-Insured Bonds. The approximate percentage
of the aggregate principal amount of the Trust that is insured by each Insurance
Company with respect to Pre-Insured Bonds is as follows: Financial Guaranty
Insurance Company ("Financial Guaranty"), 6.7%; Financial Security Assurance
Inc. ("Financial Security"), 50.4%; and MBIA Corp., 6.7%.

                  PUBLIC OFFERING PRICE. The secondary market Public Offering
Price of each Unit is equal to the aggregate offering price of the Bonds in such
Trust divided by the number of Units outstanding, plus a sales charge of 4.9% of
the Public Offering Price, or 5.127% of the net amount invested in Bonds per
Unit. In addition, accrued interest to the expected date of settlement is added
to the Public Offering Price. If Units had been purchased on the Evaluation
Date, the Public Offering Price per Unit would have been $956.57 plus accrued
interest of $7.32 under the monthly distribution plan, $11.93 under the
semi-annual distribution plan and $11.97 under the annual distribution plan, for
a total of $963.89, $968.50 and $968.54, respectively. The Public Offering Price
per Unit can vary on a daily basis in accordance with fluctuations in the
aggregate bid price of the Bonds. (See "Public Offering--Offering Price" in Part
B of this Prospectus.)

                  ESTIMATED LONG TERM RETURN AND ESTIMATED CURRENT RETURN. Units
of each Trust are offered to investors on a "dollar price" basis (using the
computation method described under "Public Offering--Offering Price" in Part B)
as distinguished from a "yield price" basis often used in offerings of tax
exempt bonds (involving the lesser of the yield as computed to maturity of bonds
or to an earlier redemption date). Since they are offered on a dollar price
basis, the rate of return on an investment in Units of each Trust is measured in
terms of "Estimated Current Return" and "Estimated Long Term Return".
    

                  Estimated Long Term Return is calculated by: (1) computing the
yield to maturity or to an earlier call date (whichever results in a lower
yield) for each Bond in the Trust's portfolio in accordance with accepted bond
practices, which practices take into account not only the interest payable on
the Bond but also the amortization of premiums or accretion of discounts, if
any; (2) calculating the average of the yields for the Bonds in the Trust's
portfolio by weighing each Bond's yield by the market value of the Bond and by
the amount of time remaining to the date to which the Bond is priced (thus
creating an average yield for the portfolio of the Trust); and (3) reducing the
average yield for the portfolio of the Trust in order to reflect estimated fees
and expenses of the Trust and the maximum sales charge paid by investors. The
resulting Estimated Long Term Return represents a measure of the return to
investors earned over the estimated life of the Trust. (For the Estimated Long
Term Return to Certificateholders under the monthly, semi-annual and annual
distribution plans, see "Summary of Essential Information".)

                  Estimated Current Return is a measure of the Trust's cash
flow. Estimated Current Return is computed by dividing the Estimated Net Annual
Interest Income per Unit by the Public Offering Price per Unit. In contrast to
the Estimated Long Term Return, the Estimated Current Return does not take into
account the amortization of premium or accretion of discount, if any, on the
Bonds in the portfolio of the Trust. Moreover, because interest rates on Bonds
purchased at a premium are generally higher than current interest rates on newly
issued bonds of a similar type with comparable rating, the Estimated Current
Return per Unit may be affected adversely if such Bonds are redeemed prior to
their maturity.

                  The Estimated Net Annual Interest Income per Unit of the Trust
will vary with changes in the fees and expenses of the Trustee and the Evaluator
applicable to the Trust and with the redemption, maturity, sale or

                                       A-3
110242.1

<PAGE>



other disposition of the Bonds in the Trust. The Public Offering Price will vary
with changes in the bid prices of the Bonds. Therefore, there is no assurance
that the present Estimated Current Return or Estimated Long Term Return will be
realized in the future. (For the Estimated Current Return to Certificateholders
under the monthly, semi-annual and annual distribution plans, see "Summary of
Essential Information". See "Estimated Long Term Return and Estimated Current
Return" in Part B of this Prospectus.)

                  A schedule of cash flow projections is available from the
Sponsors upon request.

                  DISTRIBUTIONS. Distributions of interest income, less
expenses, will be made by the Trust either monthly, semi-annually or annually
depending upon the plan chosen by the Certificateholder. Certificateholders
purchasing Units in the secondary market will initially receive distributions in
accordance with the elections of the prior owner and may thereafter change the
plan as provided under "Interest and Principal Distributions" in Part B of this
Prospectus. Distributions of principal, if any, will be made semi-annually on
June 15 and December 15 of each year. (See "Rights of
Certificateholders--Interest and Principal Distributions" in Part B of this
Prospectus. For estimated monthly, semi-annual and annual interest
distributions, see "Summary of Essential Information.")

   
                  MARKET FOR UNITS. The Sponsors, although not obligated to do
so, presently maintain and intend to continue to maintain a secondary market for
the Units at a price based on the aggregate bid price of the Bonds in the Trust
portfolio. The reoffer price will be based on the aggregate bid price of the
Bonds plus a sales charge of 4.9% of the Public Offering Price (5.127% of the
net amount invested), plus net accrued interest. If a market is not maintained a
Certificateholder will be able to redeem his or her Units with the Trustee at a
price based on the aggregate bid price of the Bonds. (See "Sponsor Repurchase"
and "Public Offering--Offering Price" in Part B of this Prospectus.)
    

                  TOTAL REINVESTMENT PLAN. Certificateholders under the
semi-annual and annual plans of distribution have the opportunity to have all
their regular interest distributions, and principal distributions, if any,
reinvested in available series of "Insured Municipal Securities Trust" or
"Municipal Securities Trust." (See "Total Reinvestment Plan" in Part B of this
Prospectus. Residents of Texas see "Total Reinvestment Plan for Texas Residents"
in Part B of this Prospectus.) The Plan is not designed to be a complete
investment program.


                                       A-4
110242.1

<PAGE>



                       INSURED MUNICIPAL SECURITIES TRUST
                          NEW JERSEY NAVIGATOR INSURED
                                    SERIES 3
<TABLE>
<CAPTION>

   
            SUMMARY OF ESSENTIAL INFORMATION AS OF DECEMBER 31, 1996


Date of Deposit:  January 31, 1991                                Minimum Principal Distribution:
- ---------------                                                   ------------------------------
<S>                                          <C>                     <C>            
Principal Amount of Bonds ...                $2,965,000              $1.00 per Unit.
- -------------------------
Number of Units .............                3,349                Weighted Average Life to Maturity:
- ---------------                                                   ---------------------------------
Fractional Undivided Inter-                                          19.0 Years.
- --------------------------
  est in Trust per Unit .....                1/3349               Minimum Value of Trust:
  ---------------------                                           ----------------------
Principal Amount of                                                  Trust may be terminated if value of
- -------------------
  Bonds per Unit ............                $885.34                 Trust is less than $2,000,000 in
  --------------
Secondary Market Public                                              principal amount of Bonds.
- -----------------------
  Offering Price**                                                Mandatory Termination Date:
  Aggregate Bid Price                                                The earlier of December 31, 2040 or
    of Bonds in Trust .......                $3,047,306+++           the disposition of the last Bond in
  Divided by 3,349 Units ....                $909.92                 the Trust.
  Plus Sales Charge of 4.9%                                       Trustee***:  The Chase Manhattan Bank.
                                                                  -------
    of Public Offering Price.                $46.65               Trustee's Annual Fee:  Monthly
  Public Offering Price                                              plan $.96 per $1,000; semi-annual
    per Unit ................                $956.57+                plan $.50 per $1,000; and annual
Redemption and Sponsors'                                             plan is $.32 per $1,000.
- ------------------------
  Repurchase Price                                                Evaluator:  Kenny S&P Evaluation
  ----------------                                                ---------
  per Unit ..................                $909.92+                Services.
  --------
                                                    +++           Evaluator's Fee for Each
                                                                  ------------------------
                                                    ++++             Evaluation:  Minimum of $8 plus $.25
                                                                     ----------
Excess of Secondary Market                                           per each issue of Bonds in excess of
  Public Offering Price                                              50 issues (treating separate
  ---------------------
  over Redemption and                                                maturities as separate issues).
  Sponsors' Repurchase                                            Sponsors:  Reich & Tang Distributors
  --------------------                                            --------
  Price per Unit ............                $46.65++++              L.P. and Gruntal & Co., L.L.C.
  --------------
Difference between Public                                         Sponsors' Annual Fee:  Maximum of
- -------------------------                                         --------------------
  Offering Price per Unit                                            $.25 per $1,000 principal amount of
  -----------------------
  and Principal Amount per                                           Bonds (see "Trust Expenses and
  ------------------------
  Unit Premium/(Discount) ...                $71.23                  Charges" in Part B of this
  -----------------------
Evaluation Time:  4:00 p.m.                                          Prospectus).
  New York Time.
    
</TABLE>



       PER UNIT INFORMATION BASED UPON INTEREST DISTRIBUTION PLAN ELECTED

<TABLE>
<CAPTION>

                                                             Monthly          Semi-Annual            Annual
                                                             Option             Option               Option
   
<S>                                                            <C>                  <C>                  <C>   
Gross annual interest income# .........                        $57.56               $57.56               $57.56
Less estimated annual fees and
  expenses ............................                          2.21                 1.82                 1.46
Estimated net annual interest                                  ______               ______               ______
  income (cash)# ......................                        $55.35               $55.74               $56.10
Estimated interest distribution# ......                          4.61                27.87                56.10
Estimated daily interest accrual# .....                         .1537                .1548                .1558
Estimated current return#++ ...........                         5.79%                5.83%                5.86%
Estimated long term return++ ..........                         3.24%                3.28%                3.32%
    
Record dates ..........................                      1st of           Dec. 1 and             Dec. 1
                                                             each month       June 1
Interest distribution dates ...........                      15th of          Dec. 15 and            Dec. 15
                                                             each month       June 15
</TABLE>


                                       A-5
110242.1

<PAGE>



                  Footnotes to Summary of Essential Information


   *    The Date of Deposit is the date on which the Trust Agreement was signed
        and the deposit of the Bonds with the Trustee made.

  **    For information regarding offering price per Unit and applicable sales
        charge under the Total Reinvestment Plan, see "Total Reinvestment Plan"
        in Part B of this Prospectus.

   
 ***    The Trustee maintains its principal executive office at 270 Park
        Avenue, New York, New York 10017 and its unit investment trust office
        at 4 New York Plaza, New York, New York 10004 (tel. no.:
        1-800-882-9898). For information regarding redemption by the Trustee,
        see "Trustee Redemption" in Part B of this Prospectus.

   +    Plus accrued interest to the expected date of settlement (approximately
        three business days after purchase) of $7.32 monthly, $11.93
        semi-annually and $11.97 annually.
    

  ++    The estimated current return and estimated long term return are
        increased for transactions entitled to a discount (see "Employee
        Discounts" in Part B of this Prospectus), and are higher under the
        semi-annual and annual options due to lower Trustee's fees and
        expenses.

 +++    Based solely upon the bid side evaluation of the underlying Bonds
        (including, where applicable, undistributed cash from the principal
        account). Upon tender for redemption, the price to be paid will be
        calculated as described under "Trustee Redemption" in Part B of this
        Prospectus.

++++    See "Comparison of Public Offering Price, Sponsor's Repurchase Price and
        Redemption Price" in Part B of this Prospectus.

   #    Does not include income accrual from original issue discount bonds, if
        any.


   
                      FINANCIAL AND STATISTICAL INFORMATION

Selected data for each Unit outstanding for the periods listed below:
    

<TABLE>
<CAPTION>

   
                                                                                                    Distribu-
                                                                                                    tions of
                                                           Distributions of Interest                Principal
                                                          During the Period (per Unit)               During
                                         Net Asset*                       Semi-                       the
                         Units Out-        Value          Monthly         Annual          Annual     Period
Period Ended              standing        Per Unit        Option          Option          Option    (Per Unit)
- ------------             ----------      ----------       -------         ------          ------    ----------

<S>                             <C>           <C>           <C>             <C>              <C>             <C>
December 31, 1994               4,000         $884.02       $56.04          $56.62           $56.88         -0-
December 31, 1995               3,618          944.79        60.21           60.81            61.07        $1.25
December 31, 1996               3,349          920.77        55.37           55.82            56.14         3.32


- --------
*        Net Asset Value per Unit is calculated by dividing net assets as
         disclosed in the "Statement of Net Assets" by the number of Units
         outstanding as of the date of the Statement of Net Assets. See Note 5
         of Notes to Financial Statements for a description of the components of
         Net Assets.
    
</TABLE>

                                       A-6
110242.1

<PAGE>


   
                         INFORMATION REGARDING THE TRUST
                             AS OF DECEMBER 31, 1996


DESCRIPTION OF PORTFOLIO*

                  The portfolio of the Trust consists of 8 issues representing
obligations of 7 issuers located in the state of New Jersey and 1 in Puerto
Rico. The Sponsors have not participated as a sole underwriter or manager,
co-manager or member of an underwriting syndicate from which any of the initial
aggregate principal amount of the Bonds were acquired. None of the Bonds are
obligations of state and local housing authorities; approximately 33.6% are
hospital revenue bonds+; none were issued in connection with the financing of
nuclear generating facilities; and none are "mortgage subsidy" bonds. All of the
Bonds in the Trust are subject to redemption prior to their stated maturity
dates pursuant to sinking fund or optional call provisions. The Bonds may also
be subject to other calls, which may be permitted or required by events which
cannot be predicted (such as destruction, condemnation, termination of a
contract, or receipt of excess or unanticipated revenues). One issue
representing $390,000 of the principal amount of the Bonds is a general
obligation bond. All 7 of the remaining issues representing $2,575,000 of the
principal amount of the Bonds are payable from the income of a specific project
or authority and are not supported by the issuer's power to levy taxes. The
portfolio is divided for purpose of issue as follows: Building Authority 1,
Hospital 2, Port Facility 1, School District 1, Sewer Revenue 1 and Utility
Revenue 1. For an explanation of the significance of these factors see "The
Trust--Portfolio" in Part B of this Prospectus.

                  As of December 31, 1996, $380,000 (approximately 12.8% of the
aggregate principal amount of the Bonds) were original issue discount bonds. Of
these original issue discount bonds, $200,000 (approximately 6.7% of the
aggregate principal amount of the Bonds) were Zero Coupon Bonds. Zero Coupon
Bonds do not provide for the payment of any current interest and provide for
payment at maturity at par value unless sooner sold or redeemed. The market
value of Zero Coupon Bonds is subject to greater fluctuations than coupon bonds
in response to changes in interest rates. Approximately 16.9% of the aggregate
principal amount of the Bonds in the Trust were purchased at a "market" discount
from par value at maturity, approximately 70.3% were purchased at a premium and
none were purchased at par. For an explanation of the significance of these
factors see "Discount and Zero Coupon Bonds" in Part B of this Prospectus.

                  None of the Bonds in the Trust are subject to the federal
individual alternative minimum tax under the Tax Reform Act of 1986.  See "Tax
Status" in Part B of this Prospectus.

- --------
*       Changes in the Trust Portfolio:  From January 1, 1997 to March 21, 1997,
        $35,000 of the principal amount of the Bond in portfolio no. 6 was sold
        and is no longer contained in the Trust.
+       A trust is considered to be "concentrated" in a particular category or
        industry when the securities in that category or industry constitute
        25% or more of the aggregate face amount of the portfolio. See Part B
        for disclosure, including risk factors, regarding this concentration.
    

                                       A-7
110242.1

<PAGE>


                        Report of Independent Accountants


To the Sponsor, Trustee and Certificateholders of
Insured Municipal Securities Trust, New Jersey Navigator
Insured Series 3

In our opinion, the accompanying statement of net assets, including the
portfolio of investments, and the related statements of operations and of
changes in net assets and the financial highlights present fairly, in all
material respects, the financial position of Insured Municipal Securities Trust,
New Jersey Navigator Insured Series 3 (the "Trust") at December 31, 1996, the
results of its operations, the changes in its net assets and the financial
highlights for the year then ended, in conformity with generally accepted
accounting principles. These financial statements and financial highlights
(hereafter referred to as "financial statements") are the responsibility of the
Trust's management; our responsibility is to express an opinion on these
financial statements based on our audit. We conducted our audit of these
financial statements in accordance with generally accepted auditing standards
which require that we plan and perform the audit to obtain reasonable assurance
about whether the financial statements are free of material misstatement. An
audit includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements, assessing the accounting principles
used and significant estimates made by management, and evaluating the overall
financial statement presentation. We believe that our audit, which included
confirmation of securities at December 31, 1996 by correspondence with the
Trustee, provides a reasonable basis for the opinion expressed above. The
financial statements for the prior periods presented were audited by other
independent accountants whose report dated March 31, 1996 expressed an
unqualified opinion on those financial statements.



PRICE WATERHOUSE LLP
160 Federal Street
Boston, MA 02110
March 28, 1997


<PAGE>
<TABLE>
Insured Municipal Securities Trust,
New Jersey Navigator Insured Series 3
Portfolio
December 31, 1996
- -------------------------------------------------------------------------------------------------------------------
<CAPTION>

                                                                                                    Redemption
             Aggregate                                                          Coupon Rate/      Feature (2)(4)
 Portfolio   Principal    Name of Issuer and                        Ratings      Date(s) of      S.F.-Sinking Fund     Market
    No.       Amount        Title of Bonds                            (1)       Maturity (2)      Ref.-Refunding      Value (3)
<S>        <C>            <C>                                       <C>         <C>              <C>                <C>

    1      $  500,000     N.J. Hlth. Care Facs. Fincg. Auth. Rev. BondsAAA       6.750%          7/01/08 @ 100 S.F. $     549,040
                          The Med. Cntr. of Ocean Cnty. Issue Series C           7/01/2020       7/01/01 @ 102 Ref.
                          (MBIA Corp.)

    2         495,000     N.J. Hlth. Care Facs. Fincg. Auth. Rev. BondsAAA       7.250           5/15/08 @ 100 S.F        548,564
                          Cathedral Hlth. Servs. Inc. Issue (FHA Insrd.          2/15/2021       2/15/01 @ 102 Ref.
                          Mtg.) Series A (MBIA Corp.)

    3         500,000     N.Y. & N.J. Port. Auth. Consldtd. Rev. BondsAAA        6.875           7/01/12 @ 100 S.F.       534,885
                          Sixty-Seventh Series (MBIA Corp.)                      1/01/2025       1/01/00 @ 101 Ref.

    4         500,000     N.J. Bd. of Ed. Certs. of Part. Rev. Bonds TheAAA      7.000           6/15/11 @ 100 S.F.       554,075
                          Twnshp. of Hamilton N.J. Series B (MBIA Corp.)         12/15/2015      6/15/01 @ 102 Ref.

    5         200,000     Hoboken-Union City-Weehawken N.J. Swrg. Auth.AAA       7.250           8/01/09 @ 100 S.F.       218,126
                          Swr. Rev. Bonds Series 1989 (MBIA Corp.)               8/01/2019       8/01/99 @ 102 Ref.

    6         390,000     Cmmnwlth. of P.R. Imprvmt. Bonds of 1991 Gen.AAA       7.300           7/01/11 @ 100 S.F.       436,531
                          Oblig. Rev. Bonds (MBIA Corp.)                         7/01/2020       7/01/00 @ 102 Ref.

    7         180,000     P.R. Pub. Bldgs. Auth. Pub. Ed. & Hlth. Facs.AAA       6.000           7/01/07 @ 100 S.F.       182,999
                          Rev. Rfndg. Bonds Series I (MBIA Corp.)                7/01/2012       7/01/99 @ 100 Ref.

    8         200,000     Camden Cnty.  N.J. Muni. Utils. Auth. Cnty. AAA        0.000           No Sinking Fund           51,004
                          Agreement Swr. Rev. Cap. Apprec. Bonds                 9/01/2019       None
                          Series 1990A (MBIA Corp.)
           ----------
                                                                                                                    --------------


           $2,965,000     Total Investments (Cost $2,828,850)                                                       $   3,075,224
           ----------                                                                                               ---------------
           ----------                                                                                               ---------------
</TABLE>


   See accompanying footnotes to portfolio and notes to financial statements.

<PAGE>


Insured Municipal Securities Trust,
New Jersey Navigator Insured Series 3
Footnotes to Portfolio
- --------------------------------------------------------------------------------

1.     All ratings are by Kenny S&P Evaluation Services, a business unit of J.J.
       Kenny Company, Inc., a subsidiary of The McGraw-Hill Companies, Inc. A
       brief description of the ratings symbols and their meaning is set forth
       under "Description of Bond Ratings" in Part B of the Prospectus.

2.     See "The Trust - Portfolio" in Part B of the Prospectus for an
       explanation of redemption features. See "Tax Status" in Part B of the
       Prospectus for a statement of the Federal tax consequences to a
       Certificateholder upon the sale, redemption or maturity of a bond.

3.     At December 31, 1996, the net unrealized appreciation of all the bonds
       was comprised of the following:

           Gross unrealized appreciation               $     246,374
           Gross unrealized depreciation                        -
                                                       -------------


           Net unrealized appreciation                 $     246,374
                                                       -------------
                                                       -------------


4.     The Bonds may also be subject to other calls, which may be permitted or
       required by events which cannot be predicted (such as destruction,
       condemnation, termination of a contract, or receipt of excess or
       unanticipated revenues).

   The accompanying notes form an integral part of the financial statements.

<PAGE>


Insured Municipal Securities Trust,
New Jersey Navigator Insured Series 3
Statement of Net Assets
December 31, 1996
- --------------------------------------------------------------------------------

Investments in Securities,
     at Market Value (Cost $2,828,850)                    $3,075,224
                                                         -----------
Other Assets
     Accrued Interest                                         74,852
                                                         -----------
          Total Other Assets                                  74,852
                                                         -----------
Liabilities
     Accrued Expenses                                            968
     Advance from Trustee                                     65,454
                                                         -----------
          Total Liabilities                                   66,422
                                                         -----------
Excess of Other Assets over Total                              8,430
                                                         -----------
Net Assets (3,349 Units of Fractional Undivided
     Interest Outstanding, $920.77 per                    $3,083,654
                                                         -----------
                                                         -----------



   The accompanying notes form an integral part of the financial statements.



<PAGE>


<TABLE>

Insured Municipal Securities Trust,
New Jersey Navigator Insured Series 3
Statement of Operations
- --------------------------------------------------------------------------------
<CAPTION>

                                                         For the Years Ended December 31,
                                                           1996        1995        1994
<S>                                                    <C>         <C>         <C>

Investment Income
     Interest                                          $205,420    $233,582    $235,821
                                                       --------    --------    --------
                                                       
Expenses
     Trustee's Fees                                       5,086       4,803       4,649
     Evaluator's Fees                                     2,372       2,000       2,204
     Sponser's Advisory Fee                                 794         875         875
                                                       --------    --------    --------
          Total Expenses                                  8,252       7,678       7,728
                                                       --------    --------    --------
     Net Investment Income                              197,168     225,904     228,093
                                                       --------    --------    --------
Realized and Unrealized Gain (Loss)
     Realized Gain on
          Investments                                     6,761        ----        ----

     Change in Unrealized Appreciation
          (Depreciation) on Investments                 (84,029)    259,180    (325,223)
                                                       --------    --------    --------
     Net Gain (Loss) on Investments                     (77,268)    259,180    (325,223)
                                                       --------    --------    --------
     Net Increase (Decrease)
          in Net Assets
          Resulting From Operations                    $119,900    $485,084    $(97,130)
                                                       --------    --------    --------
                                                       --------    --------    --------
</TABLE>

    The accompanying notes form an integral part of the financial statements

<PAGE>

<TABLE>


Insured Municipal Securities Trust,
New Jersey Navigator Insured Series 3
Statement of Changes in Net Assets
- --------------------------------------------------------------------------------
<CAPTION>

                                                                       For the Years Ended December 31,
                                                               1996                       1995                  1994
<S>                                                       <C>                    <C>                   <C>

Operations
Net Investment Income                                     $    197,168           $     225,904         $     228,093
Realized Gain
     on Investments                                              6,761                    ----                  ----
Change in Unrealized Appreciation
     (Depreciation) on Investments                             (84,029)                259,180              (325,223)
                                                          ------------            ------------          ------------ 
          Net Increase (Decrease) in
                Net Assets Resulting
                From Operations                                119,900                 485,084               (97,130)
                                                          ------------            ------------          ------------ 
Distributions to Certificateholders
     Investment Income                                         192,684                 239,375               225,540
     Principal                                                  11,341                   5,000                  ----

Redemptions
     Interest                                                    6,014                   5,272                  ----
     Principal                                                 244,448                 353,258                  ----
                                                          ------------            ------------          ------------ 
         Total Distributions
             and Redemptions                                   454,487                 602,905               225,540
                                                          ------------            ------------          ------------ 
         Total (Decrease)                                     (334,587)               (117,821)             (322,670)

Net Assets
     Beginning of Year                                       3,418,241               3,536,062             3,858,732
                                                          ------------            ------------          ------------ 

     End of Year (Including
         Undistributed Net Investment
         Income of $50,707, $52,237
         and $70,980, Respectively)                       $  3,083,654            $  3,418,241          $  3,536,062
                                                          ------------            ------------          ------------
                                                          ------------            ------------          ------------
</TABLE>


    The accompanying notes form an integral part of the financial statements.



<PAGE>



Insured Municipal Securities Trust,
New Jersey Navigator Insured Series 3
Notes to Financial Statements
- --------------------------------------------------------------------------------
1.       Organization

         Insured Municipal Securities Trust, New Jersey Navigator Insured Series
         3 (the "Trust") was organized on January 31, 1991 by Bear, Stearns &
         Co. Inc. and Gruntal & Co., Incorporated under the laws of the State of
         New York by a Trust Indenture and Agreement, and is registered under
         the Investment Company Act of 1940. The Trust was formed to preserve
         capital and to provide interest income.

         Effective September 28, 1995, Reich & Tang Distributors L.P. ("Reich &
         Tang") has become the successor sponsor (the "Sponsor") to certain of
         the unit investment trusts previously sponsored by Bear, Stearns & Co.
         Inc. As successor Sponsor, Reich & Tang has assumed all of the
         obligations and rights of Bear, Stearns & Co. Inc., the previous
         sponsor. Effective September 2, 1995, United States Trust Company of
         New York was merged into The Chase Manhattan Bank (the "Trustee").
         Accordingly, Chase is the successor trustee of the Trust.

2.       Summary of Significant Accounting Policies

         The following is a summary of significant accounting policies
         consistently followed by the Trust in preparation of its financial
         statements. The policies are in conformity with generally accepted
         accounting principles ("GAAP"). The preparation of financial statements
         in accordance with GAAP requires management to make estimates and
         assumptions that affect the reported amounts and disclosures in the
         financial statements. Actual amounts could differ from those estimates.

         Interest Income
         Interest income is recorded on the accrual basis. The discount on the
         zero-coupon bonds is accreted by the interest method over the
         respective lives of the bonds. The accretion of such discount is
         included in interest income; however, it is not distributed until
         realized in cash upon maturity or sale of the respective bonds.

         Security Valuation
         Investments are carried at market value which is determined by Kenny
         S&P Evaluation Services, a business unit of J.J. Kenny Company, Inc., a
         subsidiary of The McGraw-Hill Companies, Inc. The market value of the
         portfolio is based upon the bid prices for the bonds at the end of the
         year, which approximates the fair value of the security at that date,
         except that the market value on the date of deposit represents the cost
         to the Trust based on the offering prices for investments at that date.
         The difference between cost (including accumulated accretion of
         original issue discount on zero-coupon bonds) and market value is
         reflected as unrealized appreciation (depreciation) of investments.
         Securities transactions are recorded on the trade date. Realized gains
         (losses) from securities transactions are determined on the basis of
         average cost of the securities sold or redeemed.
<PAGE>



Insured Municipal Securities Trust,
New Jersey Navigator Insured Series 3
Notes to Financial Statements
- --------------------------------------------------------------------------------
3.       Income Taxes

         No provision for federal income taxes has been made in the accompanying
         financial statements because the Trust intends to continue to qualify
         for the tax treatment applicable to Grantor Trusts under the Internal
         Revenue Code. Under existing law, if the Trust so qualifies, it will
         not be subject to federal income tax on net income and capital gains
         that are distributed to unitholders.

4.       Trust Administration

         The Trustee has custody of assets and responsibility for the accounting
         records and financial statements of the Trust and is responsible for
         establishing and maintaining a system of internal control related
         thereto. The Trustee is also responsible for all estimates of expenses
         and accruals reflected in the Trust's financial statements.

         The Trust Indenture and Agreement provides for interest distributions
         as often as monthly (depending upon the distribution plan elected by
         the Certificateholders).

         The Trust Indenture and Agreement further requires that principal
         received from the disposition of bonds, other than those bonds sold in
         connection with the redemption of units, be distributed to
         Certificateholders.

         The Trust Indenture and Agreement also requires the Trust to redeem
         units tendered. For the years ended December 31, 1996 and 1995, 269 and
         382 units were redeemed, respectively. No units were redeemed during
         the period ended December 31,1994.

         The Trust pays an annual fee for trustee services rendered by the
         Trustee that ranges from $.32 to $.96 per $1,000 of outstanding
         investment principal. In addition, a minimum fee of $8.00 is paid to a
         service bureau for each portfolio valuation. A maximum fee of $.25 per
         $1,000 of outstanding investment principal is paid to the Sponsor. For
         the year ended December 31, 1996, the "Trustee's Fees" are comprised of
         Trustee fees of $2,925 and other expenses of $2,161. The other expenses
         include professional, printing and miscellaneous fees.



<PAGE>



Insured Municipal Securities Trust,
New Jersey Navigator Insured Series 3
Notes to Financial Statements
- --------------------------------------------------------------------------------
5.       Net Assets

         At December 31, 1996, the net assets of the Trust represented the
         interest of Certificateholders as follows:

           Original cost to Certificateholders         $     4,100,366
           Less Initial Gross Underwriting Commission          200,918
                                                       ----------------
                                                             3,899,448
           Accumulated Cost of Securities Sold,
              Matured or Called                             (1,084,957)
           Net Unrealized Appreciation                         246,374
           Undistributed Net Investment Income                  50,707
           Undistributed Proceeds From Investments             (27,918)
                                                       ----------------

              Total                                    $     3,083,654
                                                       ================

         The original cost to Certificateholders, less the initial gross
         underwriting commission, represents the aggregate initial public
         offering price net of the applicable sales charge on 4,000 units of
         fractional undivided interest of the Trust as of the date of deposit.

         Undistributed net investment income includes accumulated accretion of
         original issue discount of $14,359.

6.       Concentration of Credit Risk

         Since the Trust invests a portion of its assets in municipal bonds, it
         may be affected by economic and political developments in the
         municipalities. Certain debt obligations held by the Trust may be
         entitled to the benefit of insurance, standby letters of credit or
         other guarantees of banks or other financial institutions.


<PAGE>



Insured Municipal Securities Trust,
New Jersey Navigator Insured Series 3
Notes to Financial Statements
- --------------------------------------------------------------------------------
7.       Financial Highlights (per unit)*

         Selected data for a unit of the Trust outstanding for the year ended
         December 31, 1996:

         Net Asset Value, Beginning of Year**       $        944.79
                                                    ---------------

             Interest Income                                  58.96
             Expenses                                         (2.37)
                                                    ---------------
             Net Investment Income                            56.59
                                                    ---------------
             Net Gain or Loss on Investments(1)              (20.31)
                                                    ---------------

         Total from Investment Operations                     36.28
                                                    ---------------

         Less Distributions
             to Certificateholders
                 Income                                       55.31
                 Principal                                     3.26
             for Redemptions
                 Interest                                      1.73
                                                    ---------------

         Total Distributions                                  60.30
                                                    ---------------
         Net Asset Value, End of Year**             $        920.77
                                                    ---------------
                                                    ---------------

         See "Financial and Statistical Information" in Part A of this
         Prospectus for amounts of per unit distributions during the years ended
         December 31, 1996, 1995 and 1994 based on actual units.

(1)      Net gain or loss on investments is a result of changes in outstanding
         units since January 1, 1996 and the dates of net gain and loss on
         investments.


- -------------------
     *   Unless otherwise stated, based upon average units outstanding during
         the year of 3,484 ([3,349 + 3,618]/2).

     **  Based upon actual units outstanding.





             Note: Part B of This Prospectus May Not Be Distributed
                          Unless Accompanied by Part A.

                        Please Read and Retain Both Parts
                    of This Prospectus For Future Reference.


                       INSURED MUNICIPAL SECURITIES TRUST

                                Prospectus Part B

   
                              Dated: April 30, 1997
    


                                    THE TRUST



   
                  ORGANIZATION. "Insured Municipal Securities Trust" (the
"Trust") consists of the "unit investment trust" designated as set forth in Part
A.* The Trust was created under the laws of the State of New York pursuant to
the Trust Indenture and Agreement** (collectively, the "Trust Agreement"), dated
the Date of Deposit, among Reich & Tang Distributors L.P., or depending on the
particular Trust, among Reich & Tang Distributors L.P. and Gruntal & Co., L.L.C.
as Co-Sponsors (the Sponsor or Co-Sponsors, if applicable, are referred to
herein as the "Sponsor"), Kenny S&P Evaluation Services, a business unit of J.J.
Kenny Company, Inc., a subsidiary of The McGraw-Hill Companies, as Evaluator and
depending on the particular Trust, either The Bank of New York or The Chase
Manhattan Bank, as Trustee. The name of the Sponsor for a particular Trust is
contained in the "Summary of Additional Information" in Part A.
    

                  On the Date of Deposit, the Sponsor deposited with the Trustee
long-term insured bonds, and/or delivery statements relating to contracts for
the purchase of certain such bonds (the "Bonds") and cash or an irrevocable
letter of credit issued by a major commercial bank in the amount required for
such purchases. Thereafter, the Trustee, in exchange for the Bonds so deposited,
delivered to the Sponsor the Certificates evidencing the ownership of all Units
of the Trust. The Trust consists of the Bonds described under "The Trust" in
Part A, the interest (including, where applicable, earned original issue
discount) on which, in the opinions of bond counsel to the respective issuers
given at the time of original delivery of the Bonds, is exempt from regular
federal income tax under existing law.

                  Each "Unit" outstanding on the Evaluation Date represented an
undivided interest or pro rata share in the principal and interest of the Trust
in the ratio of one Unit to the principal amount of Bonds in the Trust on such
date as specified in Part A of this Prospectus. To the extent that


- --------
*        This Part B relates to the outstanding series of Insured Municipal
         Securities Trust, Insured Municipal Securities Discount Trust, Insured
         Municipal Securities New York Navigator Insured Trust, Insured
         Municipal Securities Pennsylvania Navigator Insured Trust and/or
         Insured Municipal Securities New Jersey Navigator Insured Trust as
         reflected in Part A
         attached hereto.
**       References in this Prospectus to the Trust Agreement are qualified in
         their entirety by the Trust Indenture and Agreement which is
         incorporated herein.


112677.5

<PAGE>



any Units are redeemed by the Trustee, the fractional undivided interest or pro
rata share in the Trust represented by each unredeemed Unit will increase,
although the actual interest in the Trust represented by such fraction will
remain unchanged. Units will remain outstanding until redeemed upon tender to
the Trustee by Certificateholders, which may include the Sponsor or the
Underwriters, or until the termination of the Trust Agreement.

                  OBJECTIVES. The Trust, one of a series of similar but separate
unit investment trusts formed by the Sponsor, offers investors the opportunity
to participate in a portfolio of long-term insured tax-exempt bonds with a
greater diversification than they might be able to acquire themselves. The
objectives of the Trust are to preserve capital and to provide interest income
(including, where applicable, earned original issue discount) which, in the
opinions of bond counsel given at the time of original delivery of the Bonds, is
exempt from regular federal income tax under existing law and exempt from state
and local income tax to the extent indicated herein when received by persons
subject to state and local taxation in a state in which the issuers of the Bonds
are located. Such interest income may, however, be subject to the federal
corporate alternative minimum taxes and to state and local taxes. (See
"Description of Portfolio" in Part A for a list of those Bonds which pay
interest income subject to federal individual alternative minimum tax. See also
"Tax Status".) Consistent with such objectives, the Sponsor has obtained bond
insurance guaranteeing the scheduled payment of principal and interest on
certain of the Bonds and have purchased, as to the remainder of each Trust
Portfolio, Bonds which are already covered by insurance. (See "Insurance on the
Bonds".) An investor will realize taxable income upon maturity or early
redemption of the market discount bonds in a Trust portfolio and will realize,
where applicable, tax-exempt income to the extent of the earned portion of
interest, including original issue discount earned on the Bonds in a Trust
portfolio. Investors should be aware that there is no assurance the Trust's
objectives will be achieved as these objectives are dependent on the continuing
ability of the issuers of the Bonds to meet their interest and principal payment
requirements, on the abilities of the Insurance Companies to meet their
obligations under the policies of insurance issued on the Bonds, on the
continuing satisfaction of the Bonds of the conditions required for the
exemption of interest thereon from regular federal income tax and on the market
value of the Bonds, which can be affected by fluctuations in interest rates and
other factors.

                  Since disposition of Units prior to final liquidation of each
Trust may result in an investor receiving less than the amount paid for such
Units (see "Comparison of Public Offering Price, Sponsor's Repurchase Price and
Redemption Price"), the purchase of a Unit should be looked upon as a long-term
investment. Neither the Trust nor the Total Reinvestment Plan are designed to be
complete investment programs.

   
                  PORTFOLIO. All of the Bonds in the Trust were rated "AAA" by
Standard & Poor's Ratings Services, a division of The McGraw-Hill Companies
("Standard & Poor's") at the time originally deposited in the Trust. (See
"Insurance on the Bonds.") The "AAA" rating was assigned to the Bonds by
Standard & Poor's because each Bond was insured by a municipal bond guaranty
insurance policy issued by a company whose claims-paying ability was rated "AAA"
by Standard & Poor's at that time. In the event of a downgrading of the
claims-paying ability of one of the insurers, as of the Evaluation Date, the
Bonds in the Trust which are insured by that company would no longer be rated
"AAA" by Standard & Poor's. The Units of Trusts containing the downgraded bonds
are no longer rated "AAA."
    

                  For information regarding (i) the number of issues in the
Trust, (ii) the range of fixed maturities of the Bonds, (iii) the number of
issues payable from the income of a specific project or authority and (iv) the
number of issues constituting general obligations of a government entity, see

                                       -2-
112677.5

<PAGE>



"Information Regarding the Trust" and "Portfolio" in Part A of this
Prospectus.


   
                  When selecting Bonds for a Trust, the following factors, among
others, were considered by the Sponsor: (a) the quality of the Bonds and whether
such Bonds, whether Sponsor-Insured or Pre-Insured, were rated "AAA" by Standard
& Poor's, (b) the yield and price of the Bonds relative to other tax-exempt
securities of comparable quality and maturity, (c) income to the
Certificateholders of the Trust, (d) whether a bond was insured, or insurance
was available for the Bonds at a reasonable cost, (e) in connection with Bonds
for which bond insurance was obtained by the Sponsor, the quality of the Bonds
and whether they were rated, without regard to such bond insurance, "A" or
better by either Standard & Poor's or Moody's Investors Service, Inc.
("Moody's"), and (f) the diversification of the Trust portfolio, as to purpose
of issue and location of issuer, taking into account the availability in the
market of issues which meet the Trust's quality, rating, yield and price
criteria. Subsequent to the Date of Deposit, a Bond may cease to be rated or its
rating may be reduced below that specified above. Neither event requires an
elimination of such Bond from a Trust but may be considered in the Sponsor's
determination to direct the Trustee to dispose of the Bond. (See "Portfolio
Supervision".) For an interpretation of the bond ratings see "Description of
Bond Ratings".

                  Housing Bonds: Some of the aggregate principal amount of the
Bonds may consist of obligations of state and local housing authorities whose
revenues are primarily derived from mortgage loans to rental housing projects
for low to moderate income families. Since such obligations are usually not
general obligations of a particular state or municipality and are generally
payable primarily or solely from rents and other fees, adverse economic
developments including failure or inability to increase rentals, fluctuations of
interest rates and increasing construction and operating costs may reduce
revenues available to pay existing obligations. See "Description of Portfolio"
in Part A for the amount of rental housing bonds contained therein.

                  Hospital Revenue Bonds: Some of the aggregate principal amount
of the Bonds may consist of hospital revenue bonds. Ratings of hospital bonds
are often initially based on feasibility studies which contain projections of
occupancy levels, revenues and expenses. Actual experience may vary considerably
from such projections. A hospital's gross receipts and net income will be
affected by future events and conditions including, among other things, demand
for hospital services and the ability of the hospital to provide them,
physicians' confidence in hospital management capability, economic developments
in the service area, competition, actions by insurers and governmental agencies
and the increased cost and possible unavailability of malpractice insurance.
Additionally, a major portion of hospital revenue typically is derived from
third-party payors and government programs such as Medicare and Medicaid. Both
private third-party payors and government programs have undertaken cost
containment measures designed to limit payments. Furthermore, government
programs are subject to statutory and regulatory changes, retroactive rate
adjustments, administrative rulings and government funding restrictions, all of
which may materially decrease the rate of program payments for health care
facilities. There can be no assurance that payments under governmental programs
will remain at levels comparable to present levels or will, in the future, be
sufficient to cover the costs allocable to patients participating in such
programs. In addition, there can be no assurance that a particular hospital or
other health care facility will continue to meet the requirements for
participation in such programs.

                  The health care delivery system is undergoing considerable
alteration and consolidation. Consistent with that trend, the ownership or
management of a hospital or health care facility may change, which could result
in (i) an early redemption of bonds, (ii) alteration of the facilities
    

                                       -3-
112677.5

<PAGE>

   
financed by the Bonds or which secure the Bonds, (iii) a change in the tax
exempt status of the Bonds or (iv) an inability to produce revenues sufficient
to make timely payment of debt service on the Bonds. Future legislation or
changes in the areas noted above, among other things, would affect all hospitals
to varying degrees and, accordingly, any adverse change in these areas may
affect the ability of such issuers to make payment of principal and interest on
such bonds. See "Description of Portfolio" in Part A for the amount of hospital
revenue bonds contained therein.

                  Nuclear Power Facility Bonds: Certain Bonds may have been
issued in connection with the financing of nuclear generating facilities. In
view of developments in connection with such facilities, legislative and
administrative actions have been taken and proposed relating to the development
and operation of nuclear generating facilities. The Sponsor is unable to predict
whether any such actions or whether any such proposals or litigation, if enacted
or instituted, will have an adverse impact on the revenues available to pay the
debt service on the Bonds in the portfolio issued to finance such nuclear
projects. See "Description of Portfolio" in Part A for the amount of bonds
issued to finance nuclear generating facilities contained therein.

                  Mortgage Subsidy Bonds: Certain Bonds may be "mortgage subsidy
bonds" which are obligations of which all or a significant portion of the
proceeds are to be used directly or indirectly for mortgages on owner-occupied
residences. Section 103A of the Internal Revenue Code of 1954, as amended,
provided as a general rule that interest on "mortgage subsidy bonds" will not be
exempt from Federal income tax. An exception is provided for certain "qualified
mortgage bonds." Qualified mortgage bonds are bonds that are used to finance
owner-occupied residences and that meet numerous statutory requirements. These
requirements include certain residency, ownership, purchase price and target
area requirements, ceiling amounts for state and local issuers, arbitrage
restrictions and (for bonds issued after December 31, 1984) certain information
reporting, certification, public hearing and policy statement requirements. In
the opinions of bond counsel to the issuing governmental authorities, interest
on all the Bonds in a Trust that might be deemed "mortgage subsidy bonds" will
be exempt from Federal income tax when issued. See "Description of Portfolio" in
Part A for the amount of mortgage subsidy Bonds contained therein.

                  Mortgage Revenue Bonds: Certain Bonds may be "mortgage revenue
bonds." Under the Internal Revenue Code of 1986, as amended (the "Code") (and
under similar provisions of the prior tax law) "mortgage revenue bonds" are
obligations the proceeds of which are used to finance owner-occupied residences
under programs which meet numerous statutory requirements relating to residency,
ownership, purchase price and target area requirements, ceiling amounts for
state and local issuers, arbitrage restrictions, and certain information
reporting certification, and public hearing requirements. There can be no
assurance that additional federal legislation will not be introduced or that
existing legislation will not be further amended, revised, or enacted after
delivery of these Bonds or that certain required future actions will be taken by
the issuing governmental authorities, which action or failure to act could cause
interest on the Bonds to be subject to federal income tax. If any portion of the
Bond proceeds are not committed for the purpose of the issue, Bonds in such
amount could be subject to earlier mandatory redemption at par, including issues
of Zero Coupon Bonds (see "Discount and Zero Coupon Bonds"). See "Description of
Portfolio" in Part A for the amount of mortgage revenue bonds contained therein.

                  Private Activity Bonds: The portfolio of the Trust may contain
other Bonds which are "private activity bonds" (often called Industrial Revenue
Bonds ("IRBs") if issued prior to 1987) which would be primarily of two types:
(1) Bonds for a publicly owned facility which a private entity may

                                       -4-
112677.5

<PAGE>



have a right to use or manage to some degree, such as an airport, seaport
facility or water system and (2) facilities deemed owned or beneficially owned
by a private entity but which were financed with tax-exempt bonds of a public
issuer, such as a manufacturing facility or a pollution control facility. In the
case of the first type, bonds are generally payable from a designated source of
revenues derived from the facility and may further receive the benefit of the
legal or moral obligation of one or more political subdivisions or taxing
jurisdictions. In most cases of project financing of the first type, receipts or
revenues of the issuer are derived from the project or the operator or from the
unexpended proceeds of the bonds. Such revenues include user fees, service
charges, rental and lease payments, and mortgage and other loan payments.
    

                  The second type of issue will generally finance projects which
are owned by or for the benefit of, and are operated by, corporate entities.
Ordinarily, such private activity bonds are not general obligations of
governmental entities and are not backed by the taxing power of such entities,
and are solely dependent upon the creditworthiness of the corporate user of the
project or corporate guarantor.

                  The private activity bonds in the Trust have generally been
issued under bond resolutions, agreements or trust indentures pursuant to which
the revenues and receipts payable under the issuer's arrangements with the users
or the corporate operator of a particular project have been assigned and pledged
to the holders of the private activity bonds. In certain cases a mortgage on the
underlying project has been assigned to the holders of the private activity
bonds or a trustee as additional security. In addition, private activity bonds
are frequently directly guaranteed by the corporate operator of the project or
by another affiliated company. See "Description of Portfolio" in Part A for the
amount of private activity bonds contained therein.

   
                  Litigation: Litigation challenging the validity under state
constitutions of present systems of financing public education has been
initiated in a number of states. Decisions in some states have been reached
holding such school financing in violation of state constitutions. In addition,
legislation to effect changes in public school financing has been introduced in
a number of states. The Sponsor is unable to predict the outcome of the pending
litigation and legislation in this area and what effect, if any, resulting
changes in the sources of funds, including proceeds from property taxes applied
to the support of public schools, may have on the school bonds in a Trust.
    

                  To the Sponsor's knowledge, there was no litigation pending as
of the initial Date of Deposit with respect to any Bonds which might reasonably
be expected to have a material adverse effect on a Trust. Subsequent to the Date
of Deposit, litigation may be initiated on a variety of grounds with respect to
Bonds in a Trust. Such litigation, as, for example, suits challenging the
issuance of pollution control revenue bonds under recently-enacted environmental
protection statutes, may affect the validity of such Bonds or the tax-free
nature of the interest thereon. The Sponsor is unable to predict whether any
such litigation may be instituted or, if instituted, whether it might have a
material adverse effect on a Trust.

   
                  Other Factors: The Bonds in the Trust, despite their optional
redemption provisions which generally do not take effect until 10 years after
the original issuance dates of such bonds (often referred to as "ten year call
protection"), do contain provisions which require the issuer to redeem such
obligations at par from unused proceeds of the issue within a stated period. In
recent periods of declining interest rates there have been increased redemptions
of bonds, particularly housing bonds, pursuant to such redemption provisions. In
addition, the Bonds in the Trusts are also subject to
    
                                       -5-
112677.5

<PAGE>



mandatory redemption in whole or in part at par at any time that voluntary or
involuntary prepayments of principal on the underlying collateral are made to
the trustee for such bonds or that the collateral is sold by the bond issuer.
Prepayments of principal tend to be greater in periods of declining interest
rates; it is possible that such prepayments could be sufficient to cause a bond
to be redeemed substantially prior to its stated maturity date, earliest call
date or sinking fund redemption date.

                  The Bonds may also be subject to other calls, which may be
permitted or required by events which cannot be predicted (such as destruction,
condemnation, or termination of a contract).

                  In 1976 the federal bankruptcy laws were amended so that an
authorized municipal debtor could more easily seek federal court protection to
assist in reorganizing its debts so long as certain requirements were met.
Historically, very few financially troubled municipalities have sought court
assistance for reorganizing their debts; notwithstanding, the Sponsor is unable
to predict to what extent financially troubled municipalities may seek court
assistance in reorganizing their debts in the future and, therefore, what
effect, if any, the applicable federal bankruptcy law provisions will have on
the Trusts.

                  The Trust may also include "moral obligation" bonds. Under
statutes applicable to such bonds, if any issuer is unable to meet its
obligations, the repayment of such bonds becomes a moral commitment but not a
legal obligation of the state or municipality in question. See "Description of
Portfolio" in Part A of this Prospectus for the amount of moral obligation bonds
contained therein.

                  Certain of the Bonds in the Trust are subject to redemption
prior to their stated maturity dates pursuant to sinking fund or call
provisions. A sinking fund is a reserve fund appropriated specifically toward
the retirement of a debt. A callable bond is one which is subject to redemption
or refunding prior to maturity at the option of the issuer. A refunding is a
method by which a bond is redeemed at or before maturity from the proceeds of a
new issue of bonds. In general, call provisions are more likely to be exercised
when the offering side evaluation of a bond is at a premium over par than when
it is at a discount from par. A listing of the sinking fund and call provisions,
if any, with respect to each of the Bonds is contained under "Portfolio".
Certificateholders will realize a gain or loss on the early redemption of such
Bonds, depending upon whether the price of such Bonds is at a discount from or
at a premium over par at the time Certificateholders purchase their Units.

                  Neither the Sponsor nor the Trustee shall be liable in any way
for any default, failure or defect in any of the Bonds. Because certain of the
Bonds from time to time may be redeemed or will mature in accordance with their
terms or may be sold under certain circumstances, no assurance can be given that
a Trust will retain its present size and composition for any length of time. The
proceeds from the sale of a Bond or the exercise of any redemption or call
provision will be distributed to Certificateholders on the next distribution
date, except to the extent such proceeds are applied to meet redemptions of
Units. (See "Trustee Redemption".)

   
                  Puerto Rico Bonds: Certain of the Bonds in the Trust may be
general obligations and/or revenue bonds of issuers located in Puerto Rico which
will be affected by general economic conditions in Puerto Rico. The economy of
Puerto Rico is closely integrated with that of the mainland United States.
During fiscal year 1995, approximately 89% of Puerto Rico's exports were to the
United States mainland, which was also the source of 65% of Puerto Rico's
imports. In fiscal 1995, Puerto Rico experienced a $4.6 billion positive
adjusted trade balance. The economy of Puerto Rico is dominated by

                                       -6-
112677.5

<PAGE>



the manufacturing and service sectors. The manufacturing sector has experienced
a basic change over the years as a result of increased emphasis on higher wage,
high technology industries such as pharmaceuticals, electronics, computers,
microprocessors, professional and scientific instruments, and certain high
technology machinery and equipment. The service sector, including finance,
insurance and real estate, wholesale and retail trade, and hotel and related
services, also plays a major role in the economy. It ranks second only to
manufacturing in contribution to the gross domestic product and leads all
sectors in providing employment. In recent years, the service sector has
experienced significant growth in response to and paralleling the expansion of
the manufacturing sector. Since fiscal 1985, personal income, both aggregate and
per capita, has increased consistently in each fiscal year. In fiscal 1995,
aggregate personal income was $27.0 billion ($22.5 billion in 1987 prices) and
personal income per capita was $7,296 ($6,074 in 1987 prices). Personal income
includes transfer payments to individuals in Puerto Rico under various social
programs. Total federal payments to Puerto Rico, which include many types in
addition to federal transfer payments, are lower on a per capita basis in Puerto
Rico than in any state. Transfer payments to individuals in fiscal 1995 were
$5.9 billion, of which $4.0 billion, or 67.6%, represent entitlement to
individuals who had previously performed services or made contributions under
programs such as Social Security, Veterans Benefits and Medicare. The number of
persons employed in Puerto Rico during fiscal 1995 averaged 1,051,000, an
increase of 4.0% over fiscal 1994. The unemployment rate in Puerto Rico for
fiscal 1995 decreased from 16.0% to 13.8%. The Puerto Rico Planning Board's most
recent gross product forecast for fiscal 1996, made in February 1995, showed an
increase of 2.7%. The Planning Board's Economic Activity Index, a composite
index for thirteen economic indicators, increased 2.7% for the first seven
months of fiscal 1995 compared to the same period of fiscal 1994, which period
showed an increase of 1.7% over the same period of fiscal 1993. During the first
four months of fiscal 1996 the Index increased 1.8% compared to the same period
of fiscal 1995, which period showed an increase of 2.7% over the same period of
fiscal 1994. Growth in the Puerto Rico economy in fiscal 1996 depends on several
factors, including the state of the United States economy and the relative
stability in the price of oil imports, the exchange value of the U.S. dollar,
the level of federal transfers and the cost of borrowing.
    

                  DISCOUNT AND ZERO COUPON BONDS. Some of the Bonds in a Trust
may be original issue discount bonds. The original issue discount, which is the
difference between the initial purchase price of the Bonds and the face value,
is deemed to accrue on a daily basis and the accrued portion will be treated as
tax-exempt interest income for regular federal income tax purposes. Upon sale or
redemption, any gain realized that is in excess of the earned portion of
original issue discount will be taxable as capital gain. (See "Tax Status".) The
current value of an original issue discount bond reflects the present value of
its face amount at maturity. The market value tends to increase more slowly in
early years and in greater increments as the Bonds approach maturity. Of these
original issue discount bonds, some of the aggregate principal amount of the
Bonds in the Trust may be Zero Coupon Bonds. (See "Description of Portfolio" in
Part A.) Zero Coupon Bonds do not provide for the payment of any current
interest and provide for payment at maturity at face value unless sooner sold or
redeemed. The market value of Zero Coupon Bonds is subject to greater
fluctuations than coupon bonds in response to changes in interest rates. Zero
Coupon Bonds generally are subject to redemption at compound accredit value
based on par value at maturity. Because the issuer is not obligated to make
current interest payments, Zero Coupon Bonds may be less likely to be redeemed
than coupon bonds issued at a similar interest rate, although certain zero
coupon housing bonds may be subject to mandatory call provisions.

                  Some of the Bonds in the Trust may have been purchased at a
"market" discount from par value at maturity.  This is because the coupon

                                       -7-
112677.5

<PAGE>



interest rates on the discount bonds at the time they were purchased and
deposited in each Trust were lower than the current market interest rates for
newly issued bonds of comparable rating and type. At the time of issuance the
discount bonds were for the most part issued at then current coupon interest
rates. The current yields (coupon interest income as a percentage of market
price) of discount bonds will be lower than the current yields of comparably
rated bonds of similar type newly issued at current interest rates because
discount bonds tend to increase in market value as they approach maturity and
the full principal amount becomes payable. Gain on the disposition of a Bond
purchased at a market discount generally will be treated as ordinary income,
rather than capital gain, to the extent of accrued market discount. A discount
bond held to maturity will have a larger portion of its total return in the form
of capital gain and less in the form of tax-exempt interest income than a
comparable bond newly issued at current market rates. Discount Bonds with a
large term to maturity tend to have a higher current yield and a lower current
market value than otherwise comparable bonds with a shorter term to maturity. If
interest rates rise, the value of discount bonds will decrease; and if interest
rates decline, the value of discount bonds will increase. The discount does not
necessarily indicate a lack of market confidence in the issuer.

                  INSURANCE ON THE BONDS. Each of the Bonds in the Trust is
insured by a municipal bond guaranty insurance policy obtained by either the
Sponsor with respect to Bonds which were not insured prior to their deposit in
the Trust ("Sponsor-Insured Bonds") or the issuer, underwriter or prior owner of
the Bonds ("Pre-Insured Bonds"), and issued by one of the insurance companies
described under "Insurance on the Bonds" in Part B (the "Insurance Companies").
The insurance policies are non-cancelable and will continue in force so long as
the Bonds are outstanding and the insurers remain in business. The insurance
policies guarantee the timely payment of principal and interest on the Bonds but
do not guarantee the market value of the Bonds or the value of the Units. No
representation is made herein as to any Bond insurer's ability to meet its
obligations under a policy of insurance relating to any of the Bonds. An
insurance company that is required to pay interest and/or principal in respect
of any Bond will succeed and be subrogated to the Trustee's right to collect
such interest and/or principal from the issuer and to other related rights of
the Trustee with respect to any such Bond.

                  Such insurance covers the scheduled payment of principal
thereof and interest thereon when such amounts shall become due for payment but
shall not have been paid by the issuer or any other insurer thereof. The
insurance, unless obtained by MBIA Insurance Corporation ("MBIA Corp."), will
also cover any accelerated payments of principal and any increase in interest
payments or premiums, if any, payable upon mandatory redemption of the Bonds if
interest on any Bonds is ultimately deemed to be subject to regular federal
income tax. Insurance obtained from MBIA Corp. only guarantees the full and
complete payments required to be made by or on behalf of an issuer of small
industrial revenue bonds and pollution control revenue bonds if there occurs an
event which results in the loss of tax-exempt status of the interest on such
Bonds, including principal, interest or premiums payments, if any, as and when
required. To the extent, therefore, that Bonds are only covered by insurance
obtained from MBIA Corp., such Bonds will not be covered for the full and
complete payments required to be made by or on behalf of an issuer of other than
small industrial revenue bonds or pollution control revenue bonds if there
occurs an event which results in the loss of tax-exempt status of the interest
on such Bonds. None of the insurance will cover accelerated payments of
principal or penalty interest or premiums unrelated to taxability of interest on
the Bonds. The insurance relates only to the prompt payment of principal of and
interest on the securities in the portfolios, and does not remove market risks
nor does it guarantee the market value of Units in the Trusts. The terms of the
insurance are more fully described herein. No representation is made herein as
to any Bond insurer's ability to meet its

                                       -8-
112677.5

<PAGE>



obligations under a policy of insurance relating to any of the Pre-Insured
Bonds. In addition, investors should be aware that subsequent to the Date of
Deposit the rating of the claims-paying ability of the insurer of an underlying
Pre-Insured Bond may be down-graded.

   
                  NAVIGATOR INSURED TRUSTS. Sponsor-Insured Bonds: Each of the
Bonds in the Navigator Trusts is insured by a financial guaranty insurance
policy obtained by the Sponsor (the "Navigator Sponsor-Insured Bonds") from MBIA
Corp. covering regularly scheduled payments of principal thereof and interest
thereon when such amounts become due for payment but have not been paid. Such
amounts shall be reduced by any amounts received by the holders or the owners of
the Bonds from any trustee for the Bond issuers, any other Bond insurers or any
other source other than MBIA Corp. MBIA Corp. has issued such policy or policies
covering each of the Bonds in the Navigator Trusts and each such policy will
remain in force until the payment in full of such Bonds, whether or not such
Bonds continue to be held in the Navigator Trusts. The insurer's policies
relating to small industrial development bonds and pollution control revenue
bonds also guarantee any accelerated payments required to be made by or on
behalf of an issuer of Bonds pursuant to the terms of the Bonds if there occurs
an event which results in the loss of the tax-exempt status of the interest on
such Bonds, including principal, interest or premium payments, if any, as and
when required. Such insurance does not cover for any accelerated payments
required to be made by or on behalf of an issuer of other than small industrial
revenue bonds or pollution control revenue bonds if there occurs an event which
results in the loss of the tax exempt status of the interest on such Bonds nor
will the insurance cover accelerated payments of principal or penalty interest
or premiums unrelated to taxability of interest on any of the Bonds, including
pollution control revenue bonds or small industrial development bonds. In the
event of such an acceleration, the payments guaranteed by MBIA Corp. shall be
made in such amounts and at such times as such payments would have been made
absent any such acceleration. The insurance relates only to the prompt payment
of principal of and interest on the securities in the Navigator Portfolios and
does not remove market risk nor does it guarantee the market value of Units in
the Navigator Trusts. The terms of the insurance are more fully described
herein. For discussion of the effect of an occurrence of non-payment of
principal or interest on any Bonds in the Navigator Trusts see "Portfolio
Supervision" in Part B. No representation is made herein as to any bond
insurer's ability to meet its obligations under a policy of insurance relating
to any of the Bonds in the Navigator Trusts. In addition, investors should be
aware that subsequent to the Date of Deposit the rating of the claims-paying
ability of MBIA Corp. may be downgraded, which may result in a downgrading of
the rating of the Units in the Navigator Trusts. The premiums for the Navigator
Sponsor-Insured Bonds are obligations of the Sponsor. Additionally, some of the
Bonds in the Navigator Trusts may be Pre-Insured Bonds (as described below). The
premium for the Pre-Insured Bonds is an obligation of the issuers, underwriters
or prior owners of those Bonds. The insurance policy or policies relating to the
Navigator Sponsor-Insured Bonds provides that, to the extent that Bonds are both
Pre-Insured Bonds and Navigator Sponsor-Insured Bonds, coverage is effective
after a claim has been made upon the insurer of the Pre-Insured Bonds.
    

                  Upon notification from the trustee for any bond issuer or any
holder or owner of the Bonds that such trustee or paying agent has insufficient
funds to pay any principal or interest in full when due, MBIA Corp. will be
obligated to deposit funds promptly with Citibank, N.A., New York, New York, as
fiscal agent for MBIA Corp., sufficient to fully cover the deficit. If notice of
nonpayment is received on or after the due date, MBIA Corp. will provide for
payment within one business day following receipt of the notice. Upon payment by
MBIA Corp. of any Bonds, coupons, or interest payments, MBIA Corp. shall succeed
to the rights of the owner of such Bonds, coupons or interest payments with
respect thereto.

                                       -9-
112677.5

<PAGE>




   
                  Pre-Insured Bonds: Some of the Bonds in the Trusts which are
insured under policies obtained by the Bond issuers, underwriters or prior
owners of the Bonds ("Pre-Insured Bonds") are insured either by AMBAC Indemnity
Corporation ("AMBAC"), Bond Investors Guaranty ("BIG"), Capital Guaranty
Insurance Company ("Capital Guaranty"), Connie Lee Insurance Company ("Connie
Lee"), Financial Guaranty Insurance Company ("Financial Guaranty"), Financial
Security Assurance, Inc. ("Financial Security"), Firemen's Insurance Co.
("Firemen's"), Industrial Indemnity Company ("IIC") (which operates the Health
Industry Board Insurance Program ("HIBI Program"), Municipal Bond Insurance
Association ("MBIA"), MBIA Corp. or United States Fidelity and Guaranty Company
("USF&G Company") (collectively the "Insurance Companies"). The cost of this
insurance is borne by the respective issuers, underwriters or prior owners of
the Pre-Insured Bonds. The percentage of each Portfolio insured by each
insurance company, if any, is set forth under "Insurance" in Part A of this
Prospectus.

                  AMBAC is a Wisconsin-domiciled stock insurance corporation,
regulated by the Office of the Commissioner of Insurance of the State of
Wisconsin and licensed to do business in 50 states, the District of Columbia,
the Territory of Guam and the Commonwealth of Puerto Rico, with admitted assets
(unaudited) of approximately $2,585,000,000, and statutory capital (unaudited)
of approximately $1,467,000,000 as of December 1, 1996. Statutory capital
consists of AMBAC's policyholders' surplus and statutory contingency reserve.
AMBAC is a wholly owned subsidiary of AMBAC Inc., a 100% publicly-held company.
Standard & Poor's, Moody's and Fitch Investors Service, L.P. ("Fitch") have each
assigned a triple-A claims paying ability rating to AMBAC.
    

                  AMBAC has entered into pro rata reinsurance agreements under
which a percentage of the insurance underwritten pursuant to certain municipal
bond insurance programs of AMBAC has been and will be assumed by a number of
foreign and domestic unaffiliated reinsurers.

                  AMBAC has obtained a ruling from the Internal Revenue Service
to the effect that the insuring of an obligation by AMBAC will not affect the
treatment for federal income tax purposes of interest on such obligation and
that insurance proceeds representing maturing interest paid by AMBAC under
policy provisions substantially identical to those contained in its municipal
bond insurance policy shall be treated for federal income tax purposes in the
same manner as if such payments were made by issuer of the Bonds.


   
                  Connie Lee, a stock insurance company incorporated in
Wisconsin, is a wholly-owned subsidiary of College Construction Loan Insurance
Association, a stockholder-owned District of Columbia insurance holding company
whose creation was authorized by the 1986 amendments to the Higher Education Act
to provide financial guaranties for educational facilities. The Omnibus
Consolidated Appropriations Act, 1997 (the "Privatization Act"), enacted by
Congress and signed by the President on September 30, 1996, has repealed
substantially all of the provisions of the Higher Education Act which previously
dictated the structure and operational authorities of Connie Lee. Also in
accordance with the Privatization Act, Construction Loan Insurance Corporation
repurchased on February 27, 1997 all of the 1,914,800 shares (14% of total
ownership) of the stock of Construction Loan Insurance Corporation previously
owned by the United States Department of Education. Construction Loan Insurance
Corporation is currently owned by a group of stockholders that includes Student
Loan Marketing Association ("Sallie Mae") and various institutional investors.
NEITHER CONNIE LEE NOR CONSTRUCTION LOAN INSURANCE CORPORATION IS AN AGENCY OR
INSTRUMENTALITY OF THE UNITED STATES GOVERNMENT, AND THE UNITED STATES
GOVERNMENT IS NOT AN INVESTOR IN CONNIE LEE OR CONSTRUCTION LOAN INSURANCE
CORPORATION. THE OBLIGATIONS OF CONNIE LEE ARE NOT OBLIGATIONS OF THE UNITED
STATES GOVERNMENT OR GUARANTEED IN ANY WAY BY THE FULL FAITH AND CREDIT OF THE
UNITED STATES GOVERNMENT.



                                      -10-
112677.5

<PAGE>



                  As of December 31, 1996, the total policyholders' surplus of
Connie Lee was $155,885,454 (audited) and total admitted assets were $32,533,675
(audited), as reported to the Commissioner of Insurance of the State of
Wisconsin in Connie Lee's financial statements prepared in accordance with
statutory accounting principals applicable to insurance companies. Copies of
these financial statements are available from Connie Lee upon request.

                  The consolidated annual (audited) and quarterly (unaudited)
financial statements of Construction Loan Insurance Corporation prepared in
accordance with generally accepted accounting principles are filed periodically
with the Nationally Recognized Municipal Securities Information Repositories
designated under Rule 15c2-12 of the Securities and Exchange Commission. Copies
of these financial statements are available from Connie Lee upon request.
    

                  As of the Evaluation Date, the claims-paying ability of Connie
Lee has been rated "AAA" by Standard & Poor's.

   
                  Financial Guaranty is a wholly-owned subsidiary of FGIC
Corporation ("FGIC"), a Delaware holding company. FGIC is a wholly-owned
subsidiary of General Electric Capital Corporation ("GECC"). Neither FGIC nor
GECC is obligated to pay the debts of or the claims against Financial Guaranty.
Financial Guaranty is domiciled in the State of New York and is subject to
regulation by the State of New York Insurance Department. As of December 31,
1996, the total capital and surplus of Financial Guaranty was approximately
$1,093,256,000. In addition, Financial Guaranty is currently licensed to write
insurance in 50 states and the District of Columbia.
    

                  As of the Evaluation Date, the claims-paying ability of
Financial Guaranty has been rated "AAA" by Standard & Poor's.


   
                  Firemen's, which was incorporated in New Jersey in 1855, is a
wholly-owned subsidiary of The Continental Corporation ("CIC") and a member of
CNA, a group of life, property and casualty insurance companies. On May 10,
1995, CNA Financial Corporation purchased the outstanding shares of CIC.
Firemen's, among other policy types, provides unconditional and non-cancelable
insurance on industrial development revenue bonds. As of June 30, 1996,
Firemen's statutory surplus (audited) was $405,434,074.
    


                  As of the Evaluation Date, the claims-paying ability of
Firemen's has been rated "A-" by Standard & Poor's (see "Ratings" under
"Insurance on the Bonds" in this Part B).


   
                  Financial Security is a monoline insurance company
incorporated in 1984 under the laws of the State of New York and is licensed to
engage in the financial guaranty insurance business in all 50 states, the
District of Columbia and Puerto Rico.

                  Financial Security is a wholly owned subsidiary of Financial
Security Assurance Holdings Ltd. ("Holdings"), a New York Stock Exchange listed
company. Major shareholders of Holdings include Fund American Enterprises
Holdings, Inc., US WEST Capital Corporation and The Tokio Marine and Fire
Insurance Co., Ltd. No shareholder of Holdings is obligated to pay any debt of
Financial Security or any claim under any insurance policy issued by Financial
Security or to make any additional contribution to the capital of Financial
Security.

                  Pursuant to an intercompany agreement, liabilities on
financial guaranty insurance written or reinsured from third parties by
Financial Security or any of its domestic operating insurance company
subsidiaries are reinsured among such companies on an agreed upon percentage
substantially


                                      -11-
112677.5

<PAGE>



proportional to their respective capital, surplus and reserves, subject to
applicable statutory risk limitations. In addition, Financial Security reinsures
a portion of its liabilities under certain of its financial guaranty insurance
policies with other reinsurers under various quota-share treaties and on a
transaction-by-transaction basis. Such reinsurance is utilized by Financial
Security as a risk management device and to comply with certain statutory and
rating agency requirements; it does not alter or limit Financial Security's
obligations under any financial guaranty insurance policy. As of September 30,
1996, total shareholders equity of Financial Security and its wholly-owned
subsidiaries was (unaudited) $795,183,000 and total unearned premium reserves
was (unaudited) $358,145,000.

                  As of the Evaluation Date, Financial Security's claims-paying
ability has been rated "AAA" by Standard & Poor's, Nippon Investors Service
Inc. and Standard and Poor's (Australia) Pty. Ltd. and "Aaa" by Moody's
Investors Service.

                  On the original date of deposit, some of the Bonds in the
Trusts may have been pre-insured pursuant to the HIBI Program operated by IIC.
IIC is a wholly-owned subsidiary of Industrial Indemnity Holdings, Inc.
Industrial Indemnity Holdings, Inc. is a wholly owned subsidiary of Talegen
Holdings, Inc. ICC is a California domestic stock property and casualty
insurance company that specializes in workers' compensation insurance. The
company's address is 255 California Street, San Francisco, California 94111. For
the six months ending June 30, 1996, the policy holders' surplus of ICC was
$275,983,684. For the year ended December 31, 1995, total policyholders' surplus
of IIC was $298,612,826.
    

                  As of the Evaluation Date, the claims-paying ability of IIC
has been rated "A+" by Standard & Poor's. As a result of this rating, the
ratings of all Bonds in the Trusts insured by IIC, except pre-refunded bonds,
are rated (see "Ratings" under "Insurance on the Bonds" in this Part B).

                  MBIA is an association of five insurance companies which
joined together to insure severally (and not jointly) new issues of municipal
bonds. Each insurance company comprising Municipal Bond Insurance Association
("MBIA", also known as the "Association") will be severally and not jointly
obligated under MBIA policy in the following respective percentages: The Aetna
Casualty and Surety Company, 33%; Fireman's Fund Insurance Company, 30%; The
Travelers Indemnity Company, 15%; Aetna Insurance Company*, 12%; and The
Continental Insurance Company, 10%. As a several obligor, each such insurance
company will be obligated only to the extent of its percentage of any claim
under MBIA policy and will not be obligated to pay any unpaid obligation of any
other member of MBIA. Each insurance company's participation is backed by all of
its assets. However, each insurance company is a multiline insurer involved in
several lines of insurance other than municipal bond insurance, and the assets
of each insurance company also secure all of its other insurance policy and
surety bond obligations.

   
                   Some of the members of the Association are among the
shareholders of MBIA, Inc. MBIA, Inc. is the parent of MBIA Insurance
Corporation (formerly known as Municipal Bond Investors Assurance Corporation)
("MBIA Corp.") and is the principal operating subsidiary of MBIA Inc., a New
York Stock Exchange listed company. MBIA Corp. commenced municipal bond
insurance operations on January 5, 1987. MBIA Corp. is a separate and distinct
entity from the Association. MBIA Corp. has no liability to the bondholders for
the obligations of the Association.
    

- --------
*        Now known as Cigna Property and Casualty Company.

                                      -12-
112677.5

<PAGE>



                  The following table sets forth certain financial information
with respect to the five insurance companies comprising MBIA. The statistics,
which have been furnished by MBIA, are as reported by the insurance companies to
the New York State Insurance Department and are determined in accordance with
statutory accounting principals. No representation is made herein as to the
accuracy or adequacy of such information or as to the absence of material
adverse changes in such information subsequent to the date thereof. In addition,
these numbers are subject to revision by the New York State Insurance Department
which, if revised, could either increase or decrease the amounts.

                  MUNICIPAL BOND INSURANCE ASSOCIATION ("MBIA")
                    FIVE MEMBER COMPANIES ASSETS, LIABILITIES
                           AND POLICYHOLDERS' SURPLUS
                              AS OF MARCH 31, 1995
                                 (000's omitted)


<TABLE>
<CAPTION>
                                                        New York           New York           New York
                                                        Statutory          Statutory          Policyholder's
                                                        Assets             Liabilities        Surplus
                                                        ---------          -----------        --------------
<S>                                                     <C>                <C>                <C>

The Aetna Casualty & Surety Company                     $10,225,604        $ 8,312,158        $1,913,446
Fireman's Fund Insurance Company                          7,126,217          5,116,059         2,010,158
The Travelers Indemnity Company                          10,461,356          8,654,130         1,807,226
Cigna Property and Casualty Company                       4,260,177          3,637,513           622,664
  (Formerly Aetna Insurance Company)
The Continental Insurance Company                         3,060,583          2,380,723           679,860
                                                        -----------        -----------        ----------

   TOTAL                                                $35,133,937        $28,100,583        $7,033,354
</TABLE>



   
                 MBIA Inc. is not obligated to pay the debts of or claims
against MBIA Corp. MBIA Corp is domiciled in the State of New York and licensed
to do business in and subject to regulation under the laws of all 50 states, the
District of Columbia, the Commonwealth of Puerto Rico, the Commonwealth of the
Northern Mariana Islands, the Virgin Islands of the United States and the
Territory of Guam. MBIA Corp. has two European branches, one in the Republic of
France and the other in the Kingdom of Spain. New York has laws prescribing
minimum capital requirements, limiting classes and concentrations of investments
and requiring the approval of policy rates and forms. State laws also regulate
the amount of both the aggregate and individual risks that may be insured, the
payment of dividends by MBIA Corp., changes in control and transactions among
affiliates. Additionally, MBIA Corp. is required to maintain contingency
reserves on its liabilities in certain amounts and for certain periods of time.

                 As of December 31, 1996, MBIA Corp had admitted assets of $4.4
billion (audited), total liabilities of $3.0 billion (audited), and total
capital and surplus of $1.4 billion (audited) determined in accordance with
statutory accounting practices prescribed or permitted by insurance regulatory
authorities. As of December 31, 1995, MBIA Corp. had admitted assets of $3.8
billion (audited), total liabilities of $2.5 billion (audited), and total
capital and surplus of $1.3 billion (audited) determined in accordance with
statutory accounting practices prescribed or permitted by insurance regulatory
authorities.

                   Copies of MBIA Corp.'s year-end financial statements prepared
in accordance with statutory accounting practices are available without charge
from MBIA Corp. A copy of the Annual Report on Form 10-K of MBIA Inc. is
available from MBIA Corp. or the Securities and Exchange Commission. The

                                      -13-
112677.5

<PAGE>



address of MBIA Corp. is 113 King Street, Armonk, New York 10504.  The
telephone number of MBIA Corp. is (914) 273-4545.

                 As of the Evaluation Date, the claims-paying ability of MBIA
Corp. has been rated "AAA" by Standard & Poor's and Fitch, and Aaa by Moody's.

                 USF&G Company is the principal subsidiary of USF&G Corporation,
a holding company engaged primarily in the insurance business. USF&G Company,
founded in 1896, is the twenty-third largest property/casualty insurer in the
United States, based on Insurance Services Office's Top 100 Insurer net premiums
written for the year ended December 31, 1996. USF&G Company markets commercial
and personal insurance products, concentrating on targeted market segments,
through a distribution network of approximately 3,400 independent agents. USF&G
Corporation's life insurance subsidiary, F&G Life, markets life insurance and
annuity products through a network of wholesalers, brokers and specialty
marketing organizations. USF&G Company accounted for $3.1 billion (or 88%) of
USF&G Corporation's approximately $3.5 billion total revenues earned for the
year ended December 31, 1996. As of the Evaluation Date, the claims-paying
ability of USF&G Company has been rated A by Standard & Poor's (see "Ratings"
under "Insurance on the Bonds" in this Part B).

                 INSURED MUNICIPAL SECURITIES TRUST. Sponsor-Insured bonds: For
those Bonds which are not covered by an insurance policy obtained by the issuers
of such Bonds, the Sponsor has obtained bond insurance from either BIG,
Financial Guaranty, MBIA or MBIA Corp. in an effort to protect
Certificateholders against nonpayment of principal and interest in respect of
such Bonds (the "Sponsor-Insured Bonds"). The bond insurance on the
Sponsor-Insured Bonds covers the Sponsor-Insured Bonds deposited in a Trust at
the time that they are physically delivered to the Trustee (in the case of
bearer bonds) or registered in the name of the Trustee or its nominee or
delivered along with an assignment (in the case of registered bonds) or
registered in the name of the Trustee or its nominee (in the case of bonds held
in book-entry form). Accordingly, although contracts to purchase Sponsor-Insured
Bonds are not covered by the bond insurance obtained by the Sponsor, such Bonds
will be insured when they are deposited in the Trust. When selecting Bonds for a
Trust prior to obtaining insurance thereon, the Sponsor considers the factors
listed under "Portfolio", among others. The insurers of the Sponsor-Insured
Bonds apply their own standards in determining whether to insure the
Sponsor-Insured Bonds. To the extent that the standards of such insurers are
more restrictive than those of the Sponsor, the Sponsor's investment criteria
have been limited to the more restrictive standards.

                 Pre-Insured Bonds: The Bonds which are insured under policies
obtained by the Bond issuers are insured by AMBAC, BIG, Financial Guaranty,
Firemen's, MBIA, or MBIA Corp. (collectively, the "Insurance Companies") on the
date the Bonds were originally deposited in the Trust. The cost of this
insurance is borne by the respective issuers of the Pre-Insured Bonds. The
percentage of the Portfolio insured by each Insurance Company, if any, is set
forth under "Insurance" in Part A.

                 Ratings: As of the Date of Deposit for each of the respective
Trusts, Standard & Poor's had rated the claims-paying ability of each of the
above insurance companies "AAA" and had rated each of the Bonds in the Portfolio
"AAA" because the insurance companies had insured the Bonds. The assignment of
such "AAA" ratings was due to Standard & Poor's assessment of the
creditworthiness of the insurance companies and their ability to pay claims on
their policies of insurance. Subsequently, the rating of the claims-paying
ability of the insurer of an underlying Bond may cease to be rated or may be
downgraded which may result in a downgrading of the rating of the Units in the
Trust. For a discussion of the rating of the claims-paying ability of each of
the Bond insurers see "Insurance On The Bonds". For a list of Bond Ratings as of
the Evaluation Date see the "Portfolio" in Part A of

                                      -14-
112677.5

<PAGE>



this Prospectus. For a discussion of the rating assigned to the Units of the
Trusts, see "the Trust" in Part A of this Prospectus. The percentage of each
Trust portfolio insured by each Insurance Company, if any, is set forth under
"Insurance" in Part A.
    

                 The foregoing information relating to the above insurance
companies is from published documents and other public sources and/or
information provided by such insurance companies. No representation is made
herein as to the accuracy or adequacy of such information or as to the absence
of material adverse changes in such information subsequent to the dates thereof,
but the Sponsor is not aware that the information herein is inaccurate or
incomplete.


                               RISK CONSIDERATIONS

                 SPECIAL FACTORS AFFECTING THE NAVIGATOR TRUSTS. The Sponsor
believes the information summarized below describes some of the more significant
events relating to the Navigator Trusts. Sources of such information are the
official statements of issuers located in the states of the Navigator Trusts
which have been issued in connection with the debt offerings of such states, as
well as other publicly available documents and information. While the Sponsor
has not independently verified such information, they have no reason to believe
it is not correct in all material respects.

   
                 NEW YORK TRUST.  Special Factors Affecting New York.  The
information set forth below is derived from the official statements and/or
preliminary drafts of official statements prepared in connection with the
issuance of New York State and New York City municipal bonds.  The Sponsors
have not independently verified this information.

                 Economic Trends. Over the long term, the State of New York (the
"State") and the City of New York (the "City") face serious potential economic
problems. The City accounts for approximately 41% of the State's population and
personal income, and the City's financial health affects the State in numerous
ways. The State historically has been one of the wealthiest states in the
nation. For decades, however, the State has grown more slowly than the nation as
a whole, gradually eroding its relative economic affluence. Statewide, urban
centers have experienced significant changes involving migration of the more
affluent to the suburbs and an influx of generally less affluent residents.
Regionally, the older Northeast cities have suffered because of the relative
success that the South and the West have had in attracting people and business.
The City has also had to face greater competition as other major cities have
developed financial and business capabilities which make them less dependent on
the specialized services traditionally available almost exclusively in the City.

                 The State has for many years had a very high State and local
tax burden relative to other states. The State and its localities have used
these taxes to develop and maintain their transportation networks, public
schools and colleges, public health systems, other social services and
recreational facilities. Despite these benefits, the burden of State and local
taxation, in combination with the many other causes of regional economic
dislocation, has contributed to the decisions of some businesses and individuals
to relocate outside, or not locate within, the State.

                 Notwithstanding the numerous initiatives that the State and its
localities may take to encourage economic growth and achieve balanced budgets,
reductions in Federal spending could materially and adversely affect the
financial condition and budget projections of the State and its localities.
    

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                 New York City. The City, with a population of approximately 7.3
million, is an international center of business and culture. Its
non-manufacturing economy is broadly based, with the banking and securities,
life insurance, communications, publishing, fashion design, retailing and
construction industries accounting for a significant portion of the City's total
employment earnings. Additionally, the City is the nation's leading tourist
destination. The City's manufacturing activity is conducted primarily in apparel
and printing.

                 The national economic downturn which began in July 1990
adversely affected the local economy, which had been declining since late 1989.
As a result, the City experienced job losses in 1990 and 1991 and real Gross
City Product ("GCP") fell in those two years. Beginning in calendar year 1992,
the improvement in the national economy helped stabilize conditions in the City.
Employment losses moderated toward year-end and real GCP increased, boosted by
strong wage gains. After noticeable improvements in the City's economy during
calendar year 1994, economic growth slowed in calendar year 1995, and the City's
current four-year financial plan assumes that moderate economic growth will
continue through calendar year 2000.

                 For each of the 1981 through 1996 fiscal years, the City
achieved balanced operating results as reported in accordance with generally
accepted accounting principles ("GAAP"). The City was required to close
substantial budget gaps in recent years in order to maintain balanced operating
results. For fiscal year 1995, the City adopted a budget which halted the trend
in recent years of substantial increases in City-funded spending from one year
to the next. There can be no assurance that the City will continue to maintain a
balanced budget as required by State law without additional tax or other revenue
increases or reductions in City services, which could adversely affect the
City's economic base.

                 Pursuant to the New York State Financial Emergency Act for the
City of New York, the City prepares an annual four-year financial plan, which is
reviewed and revised on a quarterly basis and which includes the City's capital,
revenue and expense projections and outlines proposed gap-closing programs for
years with projected budget gaps. The City's current four-year financial plan
projects substantial budget gaps for each of the 1998 through 2000 fiscal years.
The City is required to submit its financial plans to review bodies, including
the New York State Financial Control Board ("Control Board").

                 The City depends on the State for State aid both to enable the
City to balance its budget and to meet its cash requirements. There can be no
assurance that there will not be reductions in State aid to the City from
amounts currently projected or that State budgets in future fiscal years will be
adopted by the April 1 statutory deadline and that such reductions or delays
will not have adverse effects on the City's cash flow or expenditures. In
addition, the Federal Budget negotiation process could result in a reduction in
or a delay in the receipt of Federal grants in the City's 1997 fiscal year which
could have additional adverse effects on the City's cash flow or revenues.

                 The Mayor is responsible for preparing the City's four-year
financial plan, including the City's current financial plan for the 1997 through
2000 fiscal years (the "1997-2000 Financial Plan" or "Financial Plan"). The
City's projections set forth in the Financial Plan are based on various
assumptions and contingencies which are uncertain and which may not materialize.
Changes in major assumptions could significantly affect the City's ability to
balance its budget as required by State law and to meet its annual cash flow and
financing requirements. Such assumptions and contingencies include the condition
of the regional and local economies, the impact on real estate tax revenues of
the real estate market, wage increases
    

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for City employees consistent with those assumed in the Financial Plan,
employment growth, the results of a pending actuarial audit of the City's
pension system which is expected to significantly increase the City's annual
pension costs, the ability to implement proposed reductions in City personnel
and other cost reduction initiatives, which may require in certain cases the
cooperation of the City's municipal unions, the ability of the New York City
Health and Hospitals Corporation ("HHC") and BOE to take actions to offset
reduced revenues, the ability to complete revenue generating transactions and
provision of State and Federal aid and mandate relief and the impact on City
revenues of proposals for Federal and State welfare reform and any future
legislation affecting Medicare or other entitlements.

                 Implementation of the Financial Plan is also dependent upon the
City's ability to market its securities successfully. The City's financing
program for fiscal years 1997 through 2000 contemplates the issuance of $9.0
billion of general obligation bonds and $3.8 billion of bonds to be issued by
the proposed New York City Infrastructure Finance Authority ("Finance
Authority") to finance education and transportation projects. The creation of
Finance Authority, which is subject to the enactment of State legislation, is
being proposed as part of the City's effort to assist in keeping the City's
indebtedness within the forecast level of the constitutional restrictions on the
amount of debt the City is authorized to incur. Indebtedness subject to the
constitutional debt limit includes liability on capital contracts that are
expected to be funded with general obligation bonds, as well as general
obligation bonds. The City's projections of total debt subject to the general
debt limit that would be required to be issued to fund the updated ten-year
capital strategy published in April 1995 indicates that projected contracts for
capital projects and debt issuance may exceed the general debt limit by the end
of fiscal year 1997 and would exceed the general debt limit by a substantial
amount thereafter, unless legislation is enacted creating the Finance Authority
or other legislative initiatives are identified and implemented. Depending on a
number of factors, including whether the Legislature is expected to enact
legislation creating the Finance Authority or to take other action that would
provide relief under the general debt limit, the City may find it necessary to
curtail its currently defined capital program before the end of fiscal year 1997
to ensure that there is ongoing capacity to enter into capital contracts
necessary to preserve projects designed to safeguard health and safety in the
City. Without the Finance Authority or other legislative relief, the City's
general obligation financed capital program with respect to new projects would
be virtually brought to a halt during the Financial Plan period. General
obligation borrowing would continue to reimburse the City's general fund for
ongoing costs of existing contractual commitments. In addition, the City issues
revenue and tax anticipation notes to finance its seasonal working capital
requirements. The success of projected public sales of City bonds and notes and
finance Authority bonds will be subject to prevailing market conditions, and no
assurance can be given that such sales will be completed. If the City were
unable to sell its general obligation bonds and notes or bonds of the proposed
Finance Authority, it would be prevented from meeting its obligation bonds and
notes or bonds of the proposed Finance Authority, it would be prevented from
meeting its planned capital and operating expenditures. Future developments
concerning the City and public discussion of such developments, as well as
prevailing market conditions, may affect the market for outstanding City general
obligation bonds and notes.

                 On November 14, 1996, the City submitted to the Control Board
the Financial Plan for the 1997 through 2000 fiscal years, which relates to the
City, the BOE and the City University of New York ("CUNY"). The Financial Plan
is a modification to the financial plan submitted to the Control Board on June
21, 1996 (the "June Financial Plan").
    

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                 The June Financial Plan identified actions to close a
previously projected gap of approximately $2.6 billion for the 1997 fiscal year.
The proposed actions in the June Financial Plan for the 1997 fiscal year
included (i) agency actions totaling $1.2 billion; (ii) a revised tax reduction
program which would increase projected tax revenues by $369 million due to the
four year extension of the 12.5% personal income tax surcharge and other
actions; (iii) savings resulting from cost containment in entitlement programs
to reduce City expenditures and additional proposed State aid of $75 million;
(iv) the assumed receipt of revenues relating to rent payments for the City's
airports, which are currently the subject of a dispute with the Port Authority
of New York and New Jersey (the "Port Authority"); (v) the sale of the City's
television station for $207 million; and (vi) pension costs savings totaling
$134 million resulting from a proposed increase in the earnings assumption for
pension assets from 8.5% to 8.75%.

                 The 1997-2000 Financial Plan published on November 14, 1996
reflects actual receipts and expenditures and changes in forecast revenues and
expenditures since the June Financial Plan. The 1997-2000 Financial Plan
projects revenues and expenditures for 1997 fiscal year balanced in accordance
with GAAP, and projects gaps of $1.2 billion, $2.1 billion and $3.0 billion for
the 1998, 1999 and 2000 fiscal years, respectively. Changes since the June
Financial Plan include (i) an increase in projected tax revenues of $450
million, $120 million, $50 million and $45 million in fiscal years 1997 and
through 2000, respectively; (ii) a delay in the assumed receipt of $304 million
relating to projected rent payments for the City airports from the 1997 fiscal
year to the 1998 and 1999 fiscal years, and a $34 million reduction in assumed
State and Federal aid for the 1997 Fiscal year; (iii) an approximately $200
million increase in projected overtime and other expenditures in each of the
fiscal years 1997 through 2000; (iv) a $70 million increase in expenditures for
BOE in the 1997 fiscal year for school text books; (v) a reduction in projected
pension costs of $34 million, $50 million, $49 million and $47 million in fiscal
years 1997 through 2000, respectively; and (vi) additional agency actions
totalling $179 million, $386 million, $473 million and $589 million in fiscal
years 1997 through 2000, including personnel reductions through attrition and
early retirement.

                 The Financial Plan assumes (i) approval by the Governor and the
State Legislature of the extension of the 12.5% personal income tax surcharge,
which is projected to provide revenue of $170 million, $463 million, $492
million and $521 million, in the 1997 through 2000 fiscal years, respectively;
(ii) collection of the projected rent payments for the City's airports,
totalling $270 million and $180 million in the 1998 and 1999 fiscal years,
respectively, which may depend on the successful completion of negotiations with
the Port Authority or the enforcement of the City's rights under the existing
leases thereto through pending legal actions; (iii) the ability of HHC and BOE
to identify actions to offset substantial City and State revenue reductions and
the receipt by BOE of additional State aid; (iv) State approval of the cost
containment initiatives and State aid proposed by the City; and (v) a reduction
in City funding for labor settlements for certain public authorities or
corporations. Legislation extending the 12.5% personal income tax surcharge
beyond December 31, 1996, was not enacted in the special legislative session
held in December 1996. Such legislation may be enacted in the 1997 State
Legislative Session. The Financial Plan does not reflect any increased costs
which the City might incur as a result of welfare legislation recently enacted
by Congress or legislation proposed by the Governor, which would, if enacted,
implement such Federal welfare legislation. In addition, the economic and
financial condition of the City may be affected by various financial, social,
economic and political factors which could have a material effect on the City.
    

                 In January 1997, the Mayor is expected to publish a
modification (the "January Modification") to the financial plan for the City's
1997 through

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2001 fiscal years and a preliminary budget for the City's 1998 fiscal year. The
January Modification will reflect changes since the Financial Plan, including
the City's program to address the currently forecast gap of approximately $1.2
billion in the 1998 fiscal year. The gap-closing program, as proposed in the
Financial Plan, is currently being further developed and is subject to change in
connection with the January Modification. The Governor released the 1997-1998
Executive Budget on January 14, 1997, which will be considered for adoption by
the State Legislature. Based on a preliminary evaluation of currently available
information, the City's Office of Management and Budget ("OMB") believes that
the reductions in Medicaid reimbursement rates and other entitlement and welfare
initiatives proposed in the 1997-1998 Executive Budget, if approved by the State
Legislature without change, would provide the City with a portion of the $650
million of additional aid and reductions in entitlements costs assumed in the
City's gap-closing program for the 1998 fiscal year. OMB expects that the
January Modification will reflect additional initiative proposed by the City
relating to reductions in entitlement costs and additional governmental aid,
which would be dependent upon State legislative approval. Certain proposed cost
containment and other initiatives have been previously considered and rejected
by the State Legislature. The nature and extent of the impact on the City of the
State budget, when adopted, is uncertain, and no assurance can be given that the
State actions included in the State adopted budget may not have a significant
adverse impact on the City's budget and its Financial Plan. It can be expected
that the proposals contained in the January Modification to close the projected
budget gap for the 1998 fiscal year will engender substantial public debate
which will continue through the time the budget is scheduled to be adopted in
June 1997.

                 The City's financial plans have been the subject of extensive
public comment and criticism. On July 16, 1996, the staff of the City
Comptroller issued a report on the Financial Plan. The report concluded that the
City's fiscal situation remains serious, and that the City faces budgetary risks
of approximately $787 million to $941 million for the 1997 fiscal year, which
increase to $4.16 billion to $4.31 billion for fiscal year 2000.

                 The projections for the 1997 through 2000 fiscal years reflect
the cost of the settlements with the United Federation of Teachers ("UFT") and a
coalition of unions headed by District Council 37 of the American Federation of
State, County and Municipal Employees, which together represent approximately
two-thirds of the City's workforce, and assume that the City will reach
agreement with its remaining municipal unions under terms which are generally
consistent with such settlements. The settlement provides for a wage freeze in
the first two years, followed by a cumulative effective wage increase of 11% by
the end of the five year period covered by the proposed agreements, ending in
fiscal years 2000 and 2001. Additional benefit increases would raise the total
cumulative effective increase to 13% above present costs. Costs associated with
similar settlements for all City-funded employees would total $49 million, $459
million and $1.2 billion in the 1997, 1998 and 1999 fiscal years respectively,
and exceed $2 billion in each fiscal year after the 1999 fiscal year. There can
be no assurance that the City will reach an agreement with the unions that have
not yet reached a settlement with the City on the terms contained in the
Financial Plan.

                 In the event of a collective bargaining impasse, the terms of
wage settlements could be determined through statutory impasse procedures, which
can impose a binding settlement except in the case of collective bargaining with
the UFT, which may be subject to non-binding arbitration. On January 23, 1996,
the City requested the Office of Collective Bargaining to declare an impasse
against the Patrolmen's Benevolent Association and the Uniformed Firefighters
Association.
    

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                 On July 10, 1995, Standard & Poor's revised downward its rating
on City general obligation bonds from A- to BBB+ and removed City bonds from
CreditWatch. Standard & Poor's stated that "structural budgetary balance remains
elusive because of persistent softness in the City's economy, highlighted by
weak job growth and a growing dependence on the historically volatile financial
services sector". Other factors identified by Standard & Poor's in lowering its
rating on City bonds included a trend of using one-time measures, including debt
refinancings, to close projected budget gaps, dependence on unratified labor
savings to help balance the Financial Plan, optimistic projections of additional
federal and State aid or mandate relief, a history of cash flow difficulties
caused by State budget delays and continued high debt levels.

                 On March 1, 1996, Moody's stated that the rating for City
general obligation bonds remains under review pending the outcome of the
adoption of the City's budget for the 1997 fiscal year, and, in light of the
status of the debate on public assistance and Medicaid reform; the enactment of
a State budget, upon which major assumptions regarding State aid are dependent,
which may be extensively delayed; and the seasoning of the City's economy with
regard to its strength and direction in the face of a potential national
economic slowdown. Since July 15, 1993, Fitch Investors Service, L.P. ("Fitch")
has rated City bonds A-. On February 28, 1996, Fitch placed the City's general
obligation bonds on FitchAlert with negative implications. On November 5, 1996,
Fitch removed the City's general obligation bonds from FitchAlert, although
Fitch stated the outlook remains negative.

                 New York State and its Authorities. The State's current fiscal
year commenced on April 1, 1996, and ends on March 31, 1997, and is referred to
herein as the State's 1996-97 fiscal year. The State's budget for the 1996-97
fiscal year was enacted by the Legislature on July 13, 1996, more than three
months after the start of the fiscal year. The State Financial Plan for the
1996-97 fiscal year was formulated on July 25, 1996 and is based on the State's
budget as enacted by the Legislature and signed into law by the Governor, as
well as actual results for the first quarter of the current fiscal year. The
State's prior fiscal year commenced on April 1, 1995, and ended on March 31,
1996, and is referred to herein as the State's 1995-96 fiscal year. The State's
budget for the 1995-96 fiscal year was enacted by the Legislature on June 7,
1995, more than two months after the start of the fiscal year. The State
Financial Plan for the 1995-96 fiscal year was formulated on June 20, 1995 and
is based on the State's budget as enacted by the Legislature and signed into law
by the Governor.

                 The State closed projected budget gaps of $5.0 billion and $3.9
billion for its 1995-96 and 1996-97 fiscal years, respectively. The 1997-98 gap
was projected at $1.44 billion, based on the Governor's proposed budget of
December 1995. As a result of changes made in the enacted budget, that gap is
now expected to be larger. However, the gap is not expected to be as large as
those faced in the prior two fiscal years. The Governor has indicated that he
will propose to close any potential imbalance primarily through General Fund
expenditure reductions and without increases in taxes or deferrals of scheduled
tax reductions.

                 The 1996-97 State Financial Plan is projected to be balanced on
a cash basis. As compared to the Governor's proposed budget as revised on March
20, 1996, the State's adopted budget for 1996-97 increases General Fund spending
by $842 million, primarily from increases for education, special education and
higher education ($563 million). The balance represents funding increases to a
variety of other programs, including community projects and increased assistance
to fiscally distressed cities. Resources used to fund these additional
expenditures include $540 million in increased revenues projected for 1996-97
based on higher-than-projected tax collections during the first half of calendar
1996, $110 million in projected receipts from a new
    

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State tax amnesty program, and other resources including certain non-recurring
resources. The total amount of non-recurring resources included in the 1996-97
State budget is projected by the State Division of the Budget ("DOB") to be $1.3
billion, or 3.9 percent of total General Fund receipts.

                 The State issued its first update to the cash-basis 1996-97
State Financial Plan (the "Mid-Year Update") on October 25, 1996. The Mid-Year
Update reflects a balanced 1996-97 State Financial Plan, with a reserve for
contingencies in the General Fund of $300 million. This reserve will be utilized
to help offset a variety of potential risks and other unexpected contingencies
that the State may face during the balance of the 1996-97 fiscal year.

                 That State Financial Plan is based on a June 1996 projection by
DOB of national and State economic activity. The national economy has resumed a
more robust rate of growth after a "soft landing" in 1995, with over 11 million
jobs added nationally since early 1992. The State economy has continued to
expand, but growth remains somewhat slower than in the nation. Although the
State has added approximately 240,000 jobs since late 1992, employment growth in
the State has been hindered during recent years by significant cutbacks in the
computer and instrument manufacturing, utility, defense, and banking industries.
Government downsizing has also moderated these job gains.

                 In its Mid-Year Update the State revised its forecast of
national and State economic activity through the end of calendar year 1997 to
reflect the stronger-than-expected growth in the first half of 1996. The
national economic forecast has been changed slightly from the initial forecast
on which the original 1996-97 State Financial Plan was based. The revised
forecast projects real Gross Domestic Product in the nation of 2.5 percent for
1996 and 2.4 percent n 1997. The inflation rate is expected to be 3.0 percent in
1996 and 2.9 percent in 1997. The annual rate of job growth is expected to slow
gradually to about 1.8 percent in 1997, down from 2.2 percent in 1996. Growth in
personal income and wages are expected to slow accordingly.

                 The State economic forecast has been changed slightly from the
one formulated with the July 1996-97 State Financial Plan. Moderate growth is
projected to continue through the second half of 1996, with employment, wages
and incomes continuing their modest rise. Personal income is projected to
increase by 5.2 percent in 1996 and 4.7 percent in 1997, reflecting robust
projected wage growth fueled in part by financial sector bonus payments. Overall
employment growth will continue at a modest rate, reflecting the slowdown in the
national economy, continued spending restraint in government, and restructuring
in the health care and financial sectors.

                 The forecast for continued moderate growth, and any resultant
impact on the State's 1996-1997 Financial Plan, contains some uncertainties.
Stronger-than-expected gains in employment could lead to a significant
improvement in consumption spending. Investments could also remain robust.
Conversely, the prospect of a continuing deadlock on federal budget deficit
reduction or fears of excessively rapid economic growth could create upward
pressures on interest rates. In addition, the State economic forecast could
over- or underestimate the level of future bonus payments or inflation growth,
resulting in forecasted average wage growth that could differ significantly from
actual growth. Similarly, the State forecast could fail to correctly account for
expected declines in government and banking employment and the direction of
employment change that is likely to accompany telecommunications deregulation.

                 The DOB believes that its projections of receipts and
disbursements relating to the current State Financial Plan, and the assumptions
on which they are based, are reasonable. Actual results, however,
    
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could differ materially and adversely from the projections set forth below, and
those projections may be changed materially and adversely from time to time.

                 The economic and financial condition of the State may be
affected by various financial, social, economic and political factors. Those
factors can be very complex, may vary from fiscal year to fiscal year, and are
frequently the result of actions taken not only by the State and its agencies
and instrumentalities, but also by entities, such as the Federal government,
that are not under the control of the State. Because of the uncertainty and
unpredictability of changes in these factors, their impact cannot be fully
included in the assumptions underlying the State's projections. There can be no
assurance that the State economy will not experience results that are worse than
predicted, with corresponding material and adverse effects on the State's
financial projections.

                 The General Fund is the principal operating fund of the State
and is used to account for all financial transactions, except those required to
be accounted for in another fund. It is the State's largest fund and receives
almost all State taxes and other resources not dedicated to particular purposes.
In the State's 1996-97 fiscal year, the General Fund is expected to account for
approximately 47 percent of total governmental-fund receipts and 71 percent of
total governmental-fund disbursements. General Fund moneys are also transferred
to other funds, primarily to support certain capital projects and debt service
payments in other fund types.

                 The General Fund is projected to be balanced on a cash basis
for 1996-97 fiscal year. Actual receipts through the first two quarters of the
1996-96 State fiscal year reflecting stronger-than-expected growth in most
taxes, with actual receipts exceeding expectations by $276 million. Based on the
revised economic outlook and actual receipts for the first six months of
1996-97, projected General Fund receipts for the 1996-97 State fiscal year have
been increased by $420 million. Most of this projected increase is in the yield
of the personal income tax ($241 million), with additional increases now
expected in business taxes ($124 million) and other tax receipts ($49 million).
Projected collections from user taxes and fees have been revised downward
slightly ($5 million). Revisions were also made to both miscellaneous receipts
and in transfers from other funds (an $11 million combined projected increase).

                 Disbursements through the first six months of the fiscal year
were $415 million less than projected, primarily because of delays in processing
payments following delayed enactment of the State budget. As a result, no
savings are included in the Mid-Year Update from this slower-than-expected
spending. Projections of 1996-97 General Fund disbursements are increased by
$120 million, since increased General Fund disbursements for education are
required to replace a projected decrease in lottery receipts. This modification
is shown in the form of an increased transfer of General Fund monies to the
Lottery Fund in the Special Revenue fund type. The projected closing fund
balance in the General Fund of $337 million reflects a balance of $252 million
in the Tax Stabilization Reserve Fund (following a payment of $15 million during
the current fiscal year) and a deposit of $85 million to the Contingency Reserve
Fund.

                 On January 13, 1992, Standard & Poor's reduced its ratings on
the State's general obligation bonds from A to A- and, in addition, reduced its
ratings on the State's moral obligation, lease purchase, guaranteed and
contractual obligation debt. Standard & Poor's also continued its negative
rating outlook assessment on State general obligation debt. On April 26, 1993,
Standard & Poor's revised the rating outlook assessment to stable. On February
14, 1994, Standard & Poor's raised its outlook to positive and, on August 5,
1996, confirmed its A- rating. On January 6, 1992, Moody's reduced
    

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its ratings on outstanding limited-liability State lease purchase and
contractual obligations from A to Baa1. On July 26, 1996, Moody's reconfirmed
its A rating on the State's general obligation long-term indebtedness.

                 Litigation. The court actions in which the State is a defendant
generally involve State programs and miscellaneous tort, real property, and
contract claims. While the ultimate outcome and fiscal impact, if any, on the
State of those proceedings and claims are not currently predictable, adverse
determinations in certain of them might have a material adverse effect upon the
State's ability to maintain a balanced 1996-97 State Financial Plan.

                 The claims involving the City other than routine litigation
incidental to the performance of their governmental and other functions and
certain other litigation arise out of alleged constitutional violations, torts,
breaches of contract and other violations of law and condemnation proceedings.
While the ultimate outcome and fiscal impact, if any, on the City of those
proceedings and claims are not currently predictable, adverse determinations in
certain of them might have a material adverse effect upon the City's ability to
carry out the 1997-2000 Financial Plan. The City has estimated that its
potential future liability on account of outstanding claims against it as of
June 30, 1996 amounted to approximately $2.8 billion.

                 NEW JERSEY NAVIGATOR TRUST. New Jersey Risk Factors. State
Finance. New Jersey is the ninth largest state in population and the fifth
smallest in land area. It has an average of 1,062 people per square mile, and is
the most densely populated of all the states. The State's economic base is
diversified, consisting of a variety of manufacturing, construction and service
industries, supplemented by rural areas with selective commercial agriculture.
Historically, New Jersey's average per capita income has been well above the
national average, and in 1994 the State ranked second among the states in per
capital personal income ($7,742).
    

                 The Trust is susceptible to political, economic or regulatory
factors affecting issuers of the New Jersey securities. The following
information provides only a brief summary of some of the complex factors
affecting the financial situation in New Jersey (the "State") and is derived
from sources that are generally available to investors and is believed to be
accurate. It is based in part on information obtained from various State and
local agencies in New Jersey. No independent verification has been made of any
of the following information.

                 The New Jersey Economic Policy Council, a statutory arm of the
New Jersey Department of Commerce and Economic Development, has reported in New
Jersey Economic Indicators, a monthly publication of the New Jersey Department
of Labor, Division of Labor Market and Demographic Research, that in 1988 and
1989 employment in New Jersey's manufacturing sector failed to benefit from the
export boom experienced by many Midwest states and the State's service sectors,
which had fueled the State's prosperity since 1982, lost momentum. In the
meantime, the prolonged fast growth in the State in the mid 1980s resulted in a
tight labor market situation, which has led to relatively high wages and housing
prices. This means that, while the incomes of New Jersey residents are
relatively high, the State's business sector has become more vulnerable to
competitive pressures.

   
                 The onset of the national recession (which officially began in
July 1990 according to the National Bureau of Economic Research) caused an
acceleration of New Jersey's job losses in construction and manufacturing. In
addition, the national recession caused an employment downturn in such
previously growing sectors as wholesale trade, retail trade, finance, utilities
and trucking and warehousing. Reflecting the downturn, the rate of unemployment
in the State rose from a low of 3.6% during the first quarter of 1989 to an
estimated 5.9% in January 1997, which is above the national average

                                      -23-
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<PAGE>



of 5.4% in February 1997. Economic recovery is likely to be slow and uneven in
New Jersey, with unemployment receding at a correspondingly slow pace, due to
the fact that some sectors may lag as a result of continued excess capacity. In
addition, employers even in rebounding sectors can be expected to remain
cautious about hiring until they become convinced that improved business will be
sustained. Also, certain firms will continue to merge or downsize to increase
profitability.

                 Debt Service. The primary method for State financing of capital
projects is through the sale of the general obligation bonds of the State. These
bonds are backed by the full faith and credit of the State tax revenues and
certain other fees are pledged to meet the principal and interest payments and,
if provided, redemption premium payments, if any, required to repay the bonds.
As of June 30, 1995, there was a total authorized bond indebtedness of
approximately $9.48 billion, of which $3.65 billion was issued and outstanding,
$4.0 billion was retired (including bonds for which provisions for payment have
been made through the sale and issuance of refunding bonds) and $1.83 billion
was unissued. The debt service obligation on such outstanding indebtedness was
$466.3 million for Fiscal Year 1996.

                 New Jersey Budget and Appropriation System. The State operates
on a fiscal year beginning July 1 and ending June 30. At the end of Fiscal Year
1989, there was a surplus in the State's general fund (the fund into which all
State revenues not otherwise restricted by statute are deposited and from which
appropriations are made) of $411.2 million. At the end of Fiscal Year 1990,
there was a surplus in the general funds of $1 million. At the end of Fiscal
Year 1991, there was a surplus in the general fund of $1.4 million. New Jersey
closed its Fiscal Year 1992 with a surplus of $760.8 million and fiscal year
1993 with a surplus of $937.4 million. It is estimated that New Jersey closed
its fiscal year 1994 with a surplus of $926.0 million and fiscal year 1995 with
a surplus of $569 million.
    

                 In order to provide additional revenues to balance future
budgets, to redistribute school aid and to contain real property taxes, on June
27, 1990, and July 12, 1990, former Governor Florio signed into law legislation
which was estimated to raise approximately $2.8 billion in additional taxes
(consisting of $1.5 billion in sales and use taxes and $1.3 billion in income
taxes), the biggest tax hike in New Jersey history. There can be no assurance
that receipts and collections of such taxes will meet such estimates.

                 The first part of the tax hike took effect on July 1, 1990,
with the increase in the State's sales and use tax rate from 6% to 7% and the
elimination of exemptions for certain products and services not previously
subject to the tax, such as telephone calls, paper products (which has since
been reinstated), soaps and detergents, janitorial services, alcoholic beverages
and cigarettes. At the time of enactment, it was projected that these taxes
would raise approximately $1.5 billion in additional revenue. Projections and
estimates and receipts from sales and use taxes, however, have been subject to
variance in recent fiscal years.

                 The second part of the tax hike took effect on January 1, 1991,
in the form of an increased state income tax on individuals. At the time of
enactment, it was projected that this increase would raise approximately $1.3
billion in additional income taxes to fund a new school aid formula, a new
homestead rebate program and state assumption of welfare and social services
costs. Projections and estimates of receipts from income taxes, however, have
also been subject to variance in recent fiscal years. Under the legislation,
income tax rates increased from their previous range of 2% to 3.5% to a new
range of 2% to 7%, with the higher rates applying to married couples with
incomes exceeding $70,000 who file joint returns, and to individuals filing
single returns with incomes of more than $35,000.


                                      -24-
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<PAGE>



                 The Florio administration had contended that the income tax
package would help reduce local property tax increases by providing more state
aid to municipalities. Under the income tax legislation, the State would assume
approximately $289 million in social services costs that previously were paid by
counties and municipalities and funded by property taxes. In addition, under the
new formula for funding school aid, an extra $1.1 billion was proposed to be
sent by the State to school districts beginning in 1991, thus reducing the need
for property tax increases to support education programs.

                 Effective July 1, 1992, the State's sales and use tax rate
decreased from 7% to 6%. Effective January 1, 1994, an across-the-board 5%
reduction in the income tax rates was enacted and effective January 1, 1995,
further reductions ranging from 1% to 10% in income tax rates took effect.
Governor Whitman recently signed into law further reductions up to 15% for some
taxpayers effective January 1, 1996, thus reducing income taxes by up to 30% for
most taxpayers within three years.

   
                 On June 28, 1996, Governor Whitman signed the New Jersey
Legislature's $16.5 billion budget for Fiscal Year 1997. The balanced budget,
which includes $550 million in surplus, is less than the 1996 budget. Whether
the State can achieve a balanced budget depends on its ability to enact and
implement expenditure reductions and to collect the estimated tax revenues.
Projections and estimates of receipts from taxes have been subject to variance
in recent years as a result of several factors, most recently a significant
slowdown in the national, regional and State economies, sluggish employment and
uncertainties in taxpayer behavior as a result of actual and proposed changes in
Federal tax laws.

                 Debt Ratings. For many years, both Moody's Investors Service,
Inc., and Standard & Poor's Corporation had rated New Jersey general obligation
bonds "Aaa" and "AAA", respectively. However, Moody's Investors Service Inc.
currently rates New Jersey general obligation bonds Aa1 and Standard & Poor's
Ratings Group currently rates New Jersey general obligation bonds AA+ with
outlook stable. On July 3, 1991, Standard & Poor's Corporation downgraded New
Jersey general obligation bonds to "AA+." On June 4, 1992 Standard & Poor's
Corporation placed New Jersey general obligation bonds on Credit Watch with
negative implications, citing as its principal reason for its caution the
unexpected denial by the Federal Government of New Jersey's request for $450
million in retroactive Medicaid payments for psychiatric hospitals. These funds
were critical to closing a $1 billion gap in the State's $15 billion budget for
fiscal year 1992 which ended on June 30, 1992. Under New Jersey state law, the
gap in the current budget must be closed before the new budget year begins on
July 1, 1992. Standard & Poor's Corporation suggested the State could close
fiscal 1992's budget gap and help fill fiscal 1993's hole by a reversion of $700
million of pension contributions to its general fund under a proposal to change
the way the State calculates its pension liability. On July 6, 1992, Standard &
Poor's Corporation reaffirmed its "AA+" rating for New Jersey general obligation
bonds and removed the debt from its Credit Watch list, although it stated that
New Jersey's long-term financial outlook is negative. Standard & Poor's
Corporation was concerned that the State was entering the 1993 fiscal year that
began July 1, 1992 with a slim $26 million surplus and remained concerned about
whether the sagging State economy would recover quickly enough to meet
lawmakers' revenue projections. It also remained concerned about the recent
federal ruling leaving in doubt how much the State was due in retroactive
Medicaid reimbursements and a ruling by a federal judge, now on appeal, of the
State's method for paying for uninsured hospital patients. However, on July 27,
1994, Standard & Poor's announced that it was changing the State's outlook from
negative to stable due to a brightening of the State's prospects as a result of
Governor Whitman's effort to trim spending and cut taxes, coupled with an
improving economy. Standard & Poor's reaffirmed its "AA+"

                                      -25-
112677.5 

<PAGE>



rating at the same time. There can be no assurance that these ratings will
continue or that particular bond issues may not be adversely affected by changes
in the State or local economic and political conditions.

                 On August 24, 1992, Moody's Investors Service, Inc. downgraded
New Jersey general obligation bonds to "Aa1", stating that the reduction
reflected a developing pattern of reliance on nonrecurring measures to achieve
budgetary balance, four years of financial operations marked by revenue
shortfalls and operating deficits, and the likelihood that serious financial
pressures would persist. On August 5, 1994, Moody's reaffirmed its "Aa1" rating,
citing on the positive side New Jersey's broad-based economy, high income
levels, history of maintaining a positive financial position and moderate
(although rising) debt ratios, and, on the negative side, a continued reliance
on one-time revenue and a dependence on pension-related savings to achieve
budgetary balance.

                 Capital Construction. In addition to payment from bond
proceeds, capital construction can also be funded by appropriation of current
revenues on a pay-as-you go basis. Capital Construction expenditures for Fiscal
Year 1995 represent 1.9% of the total Fiscal Year 1995 expenditures. In Fiscal
Year 1995, total Capital Construction expenditures were $289.8 million, a
decrease of $83.4 million from Fiscal Year 1994. This amount reflects a
reduction of $136.4 million in capital projects and an increase of $53.0 million
in expenditures to the Transportation Trust Fund Authority.
    

                 All appropriations for capital projects and all proposals for
State bond authorizations are subject to the review and recommendation of the
New Jersey Commission on Capital Budgeting and Planning. This permanent
commission was established in November 1975, and is charged with the preparation
of the State Capital Improvement Plan, which contains proposals for State
spending for capital projects.

                 Lease Financing. The State has entered into a number of leases
relating to the financing of certain real property and equipment. The State
leases the State Tax Processing Building and the Richard J. Hughes Justice
Complex in Trenton, both from the Mercer County Improvement Authority (the
"Authority"). On August 8, 1991 the Authority defeased outstanding bonds
originally issued to finance construction of the Richard J. Hughes Justice
Complex through the issuance of custody receipts (the "Custody Receipts") in the
aggregate principal amount of $95,760,000. The rental is sufficient to cover the
debt service on the Authority's Custody Receipts. Maximum annual rental payments
on these leases, including debt service, maintenance and payments in lieu of
taxes, will be approximately $11 million. The State's obligation to pay the
rentals is subject to appropriations being made by the State Legislature. The
Custody Receipts will mature in the years 1992 through 2018.

                 The State has also entered into a lease agreement, as lessee,
with the New Jersey Economic Development Authority, as lessor (the "EDA") to
lease (i) office buildings that are presently under construction and, when
finished, are expected to house the New Jersey Division of Motor Vehicles, New
Jersey Network (the State's public television station) and a branch of the
United States Postal Service and (ii) a parking facility that is also under
construction, all of which were financed by the EDA's $114,391,434.70 initial
aggregate principal amount of Trenton Office Complex Revenue Bonds, 1980 Series
dated December 1, 1989. The State has also entered into a lease agreement, as
lessee, with the EDA to lease approximately 13 acres of real property and
certain infrastructure improvements thereon located in the City of Newark. This
property is in a geographical area generally bounded by McCarter Highway,
Mulberry Street and Saybrook Place and its purchase was financed by $21,510,000
aggregate principal amount of New Jersey Economic Development Authority Revenue
Bonds, New Jersey Performing Arts Center Site

                                      -26-
112677.5 

<PAGE>



Acquisition Project, 1991 Series, issued on August 20, 1991. The rental payments
required to be made by the State under such lease agreements are sufficient to
cover debt service on such bonds and other amounts payable to the EDA, including
certain administrative expenses of the EDA, and such rental payments are subject
to annual appropriation by the State Legislature. Maximum annual debt service on
such bonds is approximately $12,200,000. All of such bonds are still outstanding
and mature in the years 1992 through 2012.

                 The State has also entered into a sublease with the EDA to
lease two parking lots, certain infrastructure improvements and related elements
located at Liberty State Park in the City of Jersey City. These parking lots and
improvements have been financed by a $13,683,767.50 aggregate principal amount
of New Jersey Economic Development Authority Lease Rental Bonds, 1992 Series
(Liberty State Park Project) dated March 15, 1992. The rental payments that will
be required to be made by the State under such sublease agreement will be
sufficient to cover debt service on such bonds and other amounts payable to the
EDA, and such rental payments will be subject to appropriation by the State
Legislature.

                 In 1981, the Governor signed into law a bill creating the New
Jersey Building Authority (the "Building Authority") having the power to
construct facilities for leasing to the State (P.L. 1981, c. 120). The law
provides for leasing to the State on a basis similar to that described above.
The Building Authority is authorized to have not more than $250 million of its
notes and bonds outstanding exclusive of refunded bonds and notes, provided that
if the Building Authority issues bonds or notes to finance the total cost of a
project based on estimates prepared by an independent consultant and the
consultant determines later that the costs of the project as initially approved
have increased, the Building Authority may issue additional bonds or notes to
finance the increased cost notwithstanding the $250 million limitation. In 1985
the Building Authority issued $129,635,000 of 1985 Series Bonds for five office
building projects in the Trenton area. During April 1987 the Building Authority
issued $103,760,000 of the 1987 Series Bonds to refund the outstanding term
bonds of the 1985 issue. On April 6, 1989 the Building Authority issued
$49,752,390.30 of 1989 Series Bonds for the renovation and historical
restoration of portions of the State Capital Complex in Trenton. On October 9,
1991 the Building Authority issued $74,999,815.75 of State Building Revenue
Bonds, 1991 Series (Garden State Savings Bonds, 1991A), as capital appreciation
bonds, under the Garden State Savings Act of 1991, for the continued renovation
and historical restoration of portions of the State Capital Complex in Trenton
and for the construction of a structured parking facility. As of December 31,
1991 the total amount of Building Authority Bonds outstanding was
$238,687,206.05. Outstanding Building Authority bonds are secured by annual
rentals from the State which are subject to annual appropriations by the State
Legislature. The State's combined annual rental payment for all leases with the
Building Authority will be (i) approximately $17.5 million per year for the
years ending June 15, 1992 through 1998, 2012 and 2013 and (ii) approximately
$31.0 million per year for the years ending June 15, 1999 through 2011.

                 Beginning in April 1984, the State, acting through the Director
of the Division of Purchase and Property, entered into a series of lease
purchase agreements which provide for the acquisition of equipment and real
property to be used by various departments and agencies of the State. To date,
the State has completed nine lease purchase agreements which have resulted in
issuance of Certificates of Participation totaling $541,085,000. A Certificate
of Participation evidences a proportionate interest of the owner thereof in the
lease payments to be made by the State under the terms of the agreement. As of
December 31, 1991, $305,400,000 Certificates of Participation remain
outstanding. The agreements relating to these transactions provide for
semiannual rental payments. The State's obligation to pay rentals due under
these leases is subject to annual appropriations being made by the State

                                      -27-
112677.5 

<PAGE>



Legislature. The final maturity of the outstanding Certificates of Participation
is December 15, 2013. The majority of proceeds from these transactions have been
or will be used to acquire equipment for the State and its agencies. The rentals
payable by the State will be made from monies appropriated by the State
Legislature. The State intends to continue to use this financing technique for a
substantial portion of its future equipment requirements.

                 "Moral Obligation" Financing. Aside from its general obligation
bonds, the State's "moral obligation" backs certain obligations issued by the
New Jersey Housing and Mortgage Finance Agency, the South Jersey Port
Corporation and the Higher Education Assistance Authority.

                 New Jersey Housing and Mortgage Finance Agency. Neither the New
Jersey Housing and Mortgage Finance Agency nor its predecessors, the New Jersey
Housing Finance Agency and the New Jersey Mortgage Finance Agency, have had a
deficiency in a debt service reserve fund which required the State to
appropriate funds to meet its "moral obligation". It is anticipated that this
agency's revenues will continue to be sufficient to cover debt service on its
bonds.

                 South Jersey Port Corporation. The State provides the South
Jersey Port Corporation (the "Corporation") with funds to cover all debt service
and property tax requirements, when earned revenues are anticipated to be
insufficient to cover these obligations.

                 Higher Education Assistance Authority. The Higher Education
Assistance Authority has issued $24,996,064 aggregate principal amount of
revenue bonds, the interest on which has been capitalized to but not including
January 1, 1993. After the period of capitalized interest has ended, it is
anticipated that the authority's revenues will be sufficient to cover debt
service on its bonds.

                 Below are listed State appropriations made since 1986 which
covered deficiencies in revenues of the Corporation, for debt service and
property tax payments.
<TABLE>
<CAPTION>

                                                     Appropriation for                     Appropriation for
                Calendar Year                           Debt Service                         Property Tax
                                                     -----------------                     -----------------
<S>                                                  <C>                                   <C>

1986.........................................                       $0                              $1,647,216.00

1987.........................................                        0                               1,647,216.00

1988.........................................                        0                               1,647,216.00

1989.........................................               1,281,793.58                             1,745,917.00

1990.........................................               2,362,850.67                             1,850,000.00

1991.........................................               2,770,851.00                             1,850,000.00
</TABLE>


                  On April 2, 1987, the Corporation issued $31,580,000 aggregate
principal amount of Revenue Bonds, 1987 Series C (the "Series C Bonds"), a
portion of the proceeds of which will be used (i) on January 1, 1995, to refund
all of the Corporation's Marine Terminal Revenue Bonds, 1985 Refunding Series
and (ii) to pay interest on the Series C Bonds until January 1, 1995. Because of
the funded escrow, it is expected that there will not be any need for the State
to provide funds to pay debt service on the Series C Bonds through January 1,
1995. Also, in addition to the bonded indebtedness of the Corporation set forth
above, on April 2, 1987, the Corporation issued $10,295,000 Marine Terminal
Revenue Bonds, 1987 Series D, to provide funds for financing a portion of the
costs of various capital improvements. On

                                      -28-
112677.5 

<PAGE>



February 10, 1989, the Corporation issued $4,085,000 Marine Terminal Revenue
Bonds, 1989 Series E, to provide funds for financing a portion of the costs of
various capital improvements and additions to the Corporation's marine terminal
facilities. On November 21, 1989, the Corporation issued $3,655,000 Marine
Terminal Revenue Bonds, 1989 Series F, to provide for the costs of acquiring
land in the City of Camden, for the purpose of expanding the Corporation's
marine terminal facilities.

                  Municipal Finance. New Jersey's local finance system is
regulated by various statutes designed to assure that all local governments and
their issuing authorities remain on a sound financial basis. Regulatory and
remedial statutes are enforced by the Division of Local Government Services (the
"Division") in the State Department of Community Affairs.

     Counties and Municipalities. The Local Budget Law (N.J.S.A. 40A:4-1 et
seq.) imposes specific budgetary procedures upon counties and municipalities
("local units"). Every local unit must adopt an operating budget which is
balanced on a cash basis, and items of revenue and appropriation must be
examined by the Director of the Division (the "Director"). The accounts of each
local unit must be independently audited by a registered municipal accountant.
State law provides that budgets must be submitted in a form promulgated by the
Division and further provides for limitations on estimates of tax collection and
for reserves in the event of any shortfalls in collections by the local unit.
The Division reviews all municipal and county annual budgets prior to adoption
for compliance with the Local Budget Law. The Director is empowered to require
changes for compliance with law as a condition of approval; to disapprove
budgets not in accordance with law; and to prepare the budget of a local unit,
within the limits of the adopted budget of the previous year with suitable
adjustments for legal compliance, if the local unit is unwilling to prepare a
budget in accordance with law. This process insures that every municipality and
county annually adopts a budget balanced on a cash basis, within limitations on
appropriations or tax levies, respectively, and making adequate provision for
principal of and interest on indebtedness falling due in the fiscal year,
deferred charges and other statutory expenditure requirements. The Director also
oversees changes to local budgets after adoption as permitted by law, and
enforces regulations pertaining to execution of adopted budgets and financial
administration. In addition to the exercise of regulatory and oversight
functions, the Division offers expert technical assistance to local units in all
aspects of financial administration, including revenue collection and cash
management procedures, contracting procedures, debt management and
administrative analysis.

                  The local Government Cap Law (N.J.S.A. 40A:4-45.1 et seq.)
(the "Cap Law") generally limits the year-to-year increase of the total
appropriations of any municipality and the tax levy of any county to either 5
percent or an index rate determined annually by the Director, whichever is less.
However, where the index percentage rate exceeds 5 percent, the Cap law permits
the governing body of any municipality or county to approve the use of a higher
percentage rate up to the index rate. Further, where the index percentage rate
is less than 5 percent, the Cap Law also permits the governing body of any
municipality or county to approve the use of a higher percentage rate up to 5
percent. Regardless of the rate utilized, certain exceptions exist to the Cap
Law's limitation on increases in appropriations. The principal exceptions to
these limitations are municipal and county appropriations to pay debt service
requirements; to comply with certain other State or federal mandates; amounts
approved by referendum; and, in the case of municipalities only, to fund the
preceding year's cash deficit or to reserve for shortfalls in tax collections.
The Cap Law, scheduled to expire on December 31, 1990, was re-enacted with
amendments and made a permanent part of the Municipal Finance System.


                                      -29-
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<PAGE>



                   State law also regulates the issuance of debt by local units.
The Local Budget Law limits the amount of tax anticipation notes that may be
issued by local units and requires the repayment of such notes within three
months of the end of the fiscal year (six months in the case of the counties) in
which issued. The local Bond Law (N.J.S.A. 40A:2-1 et seq.) governs the issuance
of bonds and notes by the local units. No local unit is permitted to issue bonds
for the payment of current expenses (other than Fiscal Year Adjustment Bonds
described more fully below). Local units may not issue bonds to pay outstanding
bonds, except for reflecting purposes, and then only with the approval of the
Local Finance Board. Local units may issue bond anticipation notes for temporary
periods not exceeding in the aggregate approximately ten years from the date of
first issue. The debt that any local unit may authorize is limited to a
percentage of its equalized valuation basis, which is the average of the
equalized value of all taxable real property and improvements within the
geographic boundaries of the local unit, as annually determined by the Director
of the Division of Taxation, for each of the three most recent years. In the
calculation of debt capacity, the local Bond Law and certain other statutes
permit the deduction of certain classes of debt ("statutory deductions") from
all authorized debt of the local unit ("gross capital debt") in computing
whether a local unit has exceeded its statutory debt limit. Statutory deductions
from gross capital debt consist of bonds or notes (i) authorized for school
purposes by a regional school district or by a municipality or a school district
with boundaries coextensive with such municipality to the extent permitted under
certain percentage limitations set forth in the School Bond Law (as hereinafter
defined); (ii) authorized for purposes which are self-liquidating, but only to
the extent permitted by the Local Bond Law; (iii) authorized by a public body
other than local unit the principal of and interest on which is guaranteed by
the local unit, but only to the extent permitted by law; (iv) that are bond
anticipation notes; (v) for which provision for payment has been made; or (vi)
authorized for any other purpose for which a deduction is permitted by law.
Authorized net capital debt (gross capital debt minus statutory deductions) is
limited to 3.5 percent of the equalized valuation basis in the case of
municipalities and 2 percent of the equalized valuation basis in the case of
counties. The debt limit of a county or municipality, with certain exemptions,
may be exceeded only with the approval of the Local Finance Board.

                  Chapter 75 of the Pamphlet Laws of 1991 signed into law on
March 28, 1991 requires certain municipalities and permits all other
municipalities to adopt the State fiscal year in place of the existing calendar
fiscal year. Municipalities that change fiscal years must adopt a six month
transition budget for January to June. Since expenditures would be expected to
exceed revenues primarily because state aid for the calendar year would not be
received by the municipality until after the end of the transition year budget,
the act authorizes the issuance of Fiscal Year Adjustment Bonds to fund the one
time deficit for the six month transition budget. The act provides that the
deficit in the six month transition budget may be funded initially with bond
anticipation notes based on the estimated deficit in the six month transition
budget. Notes issued in anticipation of Fiscal Year Adjustment Bonds, including
renewals, can only be issued for up to one year unless the Local Finance Board
permits the municipality to renew them for a further period of time. The Local
Finance Board must confirm the actual deficit experienced by the municipality.
The municipality then may issue Fiscal Year Adjustment Bonds to finance the
deficit on a permanent basis. The purpose of the Act is to assist municipalities
that are heavily dependent on state aid and that have had to issue tax
anticipation notes to fund operating cash flow deficits each year. While the act
does not authorize counties to change their fiscal years, it does provide that
counties with cash flow deficits may issue Fiscal Year Adjustment Bonds as well.

                  State law authorizes State officials to supervise fiscal
administration in any municipality which is in default on its obligations;

                                      -30-
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<PAGE>



which experiences severe tax collection problems for two successive years; which
has a deficit greater than 4 percent of its tax levy for two successive years;
which has failed to make payments due and owing to the State, county, school
district or special district for two consecutive years; which has an
appropriation in its annual budget for the liquidation of debt which exceeds 25
percent of its total operating appropriations (except dedicated revenue
appropriations) for the previous budget year; or which has been subject to a
judicial determination of gross failure to comply with the Local Bond Law, the
Local Budget Law or the Local Fiscal Affairs Law which substantially jeopardizes
its fiscal integrity. State officials are authorized to continue such
supervision for as long as any of the conditions exist and until the
municipality operates for a fiscal year without incurring a cash deficit.

                  There are 567 municipalities and 21 counties in New Jersey.
During 1987, 1988, and 1989 no county exceeded its statutory debt limitations or
incurred a cash deficit in excess of 4 percent of its tax levy. The number of
municipalities which have a cash deficit greater than 4 percent of their tax
levies was five for 1987, zero for 1988, and six for 1989. The number of
municipalities which exceeded statutory debt limits was six, five, and one as of
December 31, 1987, 1988, and 1989, respectively. No New Jersey municipality or
county has defaulted on the payment of interest or principal on any outstanding
debt obligation since the 1930's.

                  School Districts. All New Jersey school districts are
coterminous with the boundaries of one or more municipalities. They are
characterized by the manner in which the board of education, the governing body
of the school district, takes office. Type I school districts, most commonly
found in cities, have a board of education appointed by the mayor or the chief
executive officer of the municipality constituting the school district. In a
Type II school district, the board of education is elected by the voters of the
district. Nearly all regional and consolidated school districts are Type II
school districts.

                  School Budgets. In every school district having a board of
school estimate, the board of school estimate examines the budget request and
fixes the appropriation amounts for the next year's operating budget after a
public hearing at which the taxpayers and other interested persons shall have an
opportunity to raise objections and to be heard with respect to the budget. This
board, whose composition is fixed by statute, certifies the budget to the
municipal governing bodies and to the local board of education. If either
disagrees, they must appeal to the State Commissioner of Education (the
"Commissioner") to request changes.

                  The Quality Education Act of 1990 (N.J.S.A. 18A:7D-1 et seq.)
limits the annual increase of a school district's net current expense budget.
The Commissioner certifies the allowable amount of increase for each school
district but may grant a higher level of increase in certain limited instances.
A school district may also submit a proposal to the voters to raise amounts
above the allowable amount of increase. If defeated, such a proposal is subject
to further review or appeal only if the Commissioner determines that additional
funds are required to provide a thorough and efficient education.

   
                  The Quality Election Act has been declared unconstitutional by
the New Jersey Supreme Court in 1994. The Supreme Court, while retaining
jurisdiction over this issue has stated that the State was required to address
the "special education needs" of 30 special needs districts for which funding
was required in addition to that necessary to achieve parity for richer
districts. The Supreme Court stated that it will not immediately intervene if
substantial equivalence of the special needs districts and wealthier districts
is achieved by the State for the 1997-1998 school year. The Court further
ordered the State to adopt a law assuring such substantial equivalence by

                                      -31-
112677.5 

<PAGE>



September 1996.  Recently, the Court again heard oral arguments as to whether
the State is in compliance with its Order entered in Abbott by Abbott v.
Burke, 136 N.J. 444 (1994).  A decision in that matter is pending.
    

                  In Type I or Type II school districts which have failed
monitoring over a period of time by the State because of continued educational
deficiencies, and are implementing an approved corrective action plan, the
Commissioner is required to determine the cost to the school district of the
implementation of those portions of the corrective action plan which are
directly responsive to the district's deficiencies as identified in the
monitoring process. Where appropriate, the Commissioner is required to
reallocate funds within the district's budget to support the corrective action
plan. The Commissioner is also required to determine the amount of additional
revenue needed to implement the corrective action plan, and to recertify the
budget for the district.

                  In State operated school districts the State District
Superintendent has the responsibility for the development of the budget subject
to appeal by the governing body of the municipality to the Commissioner and the
Director of the Division of Local Government Services in the State Department of
Community Affairs. Based upon his review, the Director is required to certify
the amount of revenues which can be raised locally to support the budget of the
State operated district. Any difference between the amount which the Director
certifies, and the total amount of local revenues required by the budget
approved by the Commissioner, is to be paid by the State in the fiscal year in
which the expenditures are made subject to the availability of appropriations.

                  School District Bonds. School district bonds and temporary
notes are issued in conformity with N.J.S.A 18A:24-1 et seq. (the "School Bond
Law"), which closely parallels the Local Bond Law. Although school districts are
exempted from the 5 percent down payment provision generally applied to bonds
issued by municipalities and counties, they are subject to debt limits (which
vary depending on the type of school system provided) and to State regulation of
their borrowing. The debt limitation on school district bonds depends upon the
classification of the school district but may be as high as 4 percent of the
average equalized valuation basis of the constituent municipality. In certain
cases involving school districts in cities with populations exceeding 100,000
the debt limit is 8 percent of the average equalized valuation basis of the
constituent municipality, and in cities with populations in excess of 80,000 the
debt limit is 6 percent of the aforesaid average equalized valuation.

                  School bonds are authorized by (i) an ordinance adopted by the
governing body of a municipality within a Type I school district; (ii) adoption
of a proposal by resolution by the board of education of a Type II school
district having a board of school estimate; or (iii) adoption of a proposal by
resolution by the board of education and approval of the proposal by the legal
voters of any other Type II school district. If school bonds will exceed the
school district borrowing capacity, a school district (other than a regional
school district) may use the balance of the municipal borrowing capacity. If the
total amount of debt exceeds the school district's borrowing capacity and any
available remaining municipal borrowing capacity, the Commissioner and the Local
Finance Board must approve the proposed authorization before it is submitted to
the voters. All authorizations of debt in a Type II school district without a
board of school estimate require an approving referendum, except where, after
hearing, the Commissioner and the State Board of Education determine that the
issuance of such debt is necessary to meet the constitutional obligation to
provide a thorough and efficient system of public schools. When such obligations
are issued, they are issued by, and in the name of, the school district.


                                      -32-
112677.5 

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                  In Type I and II school districts with a board of school
estimate, that board examines the capital proposal of the board of education and
certifies the amount of bonds to be authorized. When it is necessary to exceed
the borrowing capacity of the municipality, the approval of a majority of the
legally qualified voters of the municipality is required, together with the
approval of the Commissioner and the Local Finance Board. When such bonds are
issued for a Type I school district, they are issued by the municipality and
identified as school bonds. When bonds are issued by a Type II school district
having a board of school estimate, they are issued by, and in the name of, the
school district.

                  All authorizations of debt must be reported to the Division of
Local Government Services by a supplemental debt statement prior to final
approval.

                  School District Lease Purchase Financings. In 1982, school
districts were given an alterative to the traditional method of bond financing
capital improvements pursuant to N.J.S.A. 18A:20-4.2(f) (the "Lease Purchase
Law"). The Lease Purchase Law permits school districts to acquire a site and
school building through a lease purchase agreement with a private lessor
corporation. For Type II school districts, the lease purchase agreement does not
require voter approval. The rent payments attributable to the lease purchase
agreement are subject to annual appropriation by the school district and are
required, pursuant to N.J.A.C. 6:22-A-1.2(h), to be included in the annual
current expense budget of the school district. Furthermore, the rent payments
attributable to the lease purchase agreement do not constitute debt of the
school district and therefore do not impact on the school district's debt
limitation. Lease purchase agreements in excess of five years require the
approval of the Commissioner and the Local Finance Board.

                  Qualified Bonds. In 1976, legislation was enacted (P.L. 1976,
c. 38 and c. 39) which provides for the issuance by municipalities and school
districts of "qualified bonds." Whenever a local board of education or the
governing body of a municipality determines to issue bonds, it may file an
application with the Local Finance Board, and, in the case of a local board of
education, the Commissioner, to qualify bonds pursuant to P.L. 1976, c. 38 or c.
39. Upon approval of such an application and after receipt of a certificate
stating the name and address of the paying agent for such bonds, the maturity
schedule, interest rates and payment dates, the State Treasurer shall, in the
case of qualified bonds for school districts, withhold from the school aid
payable to such municipality or school district and in the case of qualified
bonds for municipalities, withhold from the amount of business personal property
tax replacement revenues, gross receipts; tax revenues, municipal purposes tax
assistance fund distributions, State urban aid, State revenue sharing, and any
other funds appropriated as State aid and not otherwise dedicated to specific
municipal programs, payable to such municipalities, an amount sufficient to
cover debt service on such bonds. These "qualified bonds" are not direct,
guaranteed or moral obligations of the State, and debt service on such bonds
will be provided by the State only if the above mentioned appropriations are
made by the State. Total outstanding indebtedness for "qualified bonds"
consisted of $103,720,500 by various school districts as of June 30, 1992 and
$830,037,105 by various municipalities as of June 30, 1992.

                  New Jersey School Bond Reserve Act. The New Jersey School Bond
Reserve Act (N.J.S.A. 18A:56-17 et seq.) establishes a school bond reserve
within the constitutionally dedicated Fund for the Support of Free Public
Schools. Under this law the reserve is maintained at an amount equal to 1.5
percent of the aggregate outstanding bonded indebtedness of counties,
municipalities or school districts for school purposes (exclusive of bonds whose
debt service is provided by State appropriations), but not in excess of monies
available in such Fund. If a municipality, county or school district

                                      -33-
112677.5 

<PAGE>



is unable to meet payment of the principal of or interest on any of its school
bonds, the trustee of the school bond reserve will purchase such bonds at the
face amount thereof or pay the holders thereof the interest due or to become
due. On June 30, 1991, the book value of the Fund's assets aggregated
$59,352,429 and the reserve, computed as of June 30, 1991, amounted to
$19,668,349. There has never been an occasion to call upon this Fund.

                  Local Financing Authorities. The Local Authorities Fiscal
Control Law (N.J.S.A. 40A:5A-l et seq.) provides for State supervision of the
fiscal operations and debt issuance practices of independent local authorities
and special taxing districts by the State Department of Community Affairs. The
Local Authorities Fiscal Control Law applies to all autonomous public bodies
created by counties or municipalities, which are empowered to issue bonds, to
impose facility or service charges, or to levy taxes in their districts. This
encompasses most autonomous local authorities (sewerage, municipal utilities,
parking, pollution control, improvement, etc.) and special taxing districts
(fire, water, etc.). Authorities which are subject to differing State or federal
financial restrictions are exempted, but only to the extent of that difference.

                  Financial control responsibilities over local authorities and
special districts are assigned to the Local Finance Board and the Director of
the Division of Local Government Services. The Local Finance Board exercises
approval power over the creation of new authorities and special districts as
well as their dissolution. The Local Finance Board also reviews, conducts public
hearings and issues findings and recommendations on any proposed project
financing of an authority or district, and on any proposed financing agreement
between a municipality or county and an authority or special district. The Local
Finance Board prescribes minimum audit requirements to be followed by
authorities and special districts in the conduct of their annual audits. The
Director reviews and approves annual budgets of authorities and special
districts.

                  Litigation. The State is a party in numerous legal proceedings
pertaining to matters incidental to the performance of routine governmental
operations. Such litigation includes, but is not limited to, claims asserted
against the State arising from alleged torts, alleged breaches of contracts,
condemnation proceedings and other alleged violations of State and Federal laws.
Included in the State's outstanding litigation are cases which challenge the
following: the formula relating to State aid to public schools, the method by
which the State shares with its counties maintenance recoveries and costs for
residents in State institutions, unreasonably low Medicaid payment rates for
long-term facilities in New Jersey, the obligation of counties to maintain
Medicaid or Medicare eligible residents of institutions and facilities for the
developmentally disabled, taxes paid into the Spill Compensation Fund (a fund
established to provide money for use by the State to remediate hazardous waste
sites and to compensate other persons for damages incurred as a result of
hazardous waste discharge) based upon Federal preemption, various provisions,
and the constitutionality of the Fair Automobile Insurance Reform Act of 1990,
the State's role in a consent order concerning the construction of a resource
facility in Passaic County, actions taken by the New Jersey Bureau of Securities
against an individual, the State's actions regarding alleged chromium
contamination of State-owned property in Hudson County, the issuance of
emergency redirection orders and a draft permit by the Department of
Environmental Protection and Energy, the adequacy of Medicaid reimbursement for
services rendered by doctors and dentists to Medicaid eligible children, the
Commissioner of Health's calculation of the hospital assessment required by the
Health Care Cost Reduction Act of 1991, refusal of the State to share with
Camden County Federal funding the State recently received for disproportionate
share hospital payments made to county psychiatric facilities, and the
constitutionality of annual A-901 hazardous and solid waste licensure renewal

                                      -34-
112677.5 

<PAGE>



fees collected by the Department of Environmental Protection and Energy. Adverse
judgments in these and other matters could have the potential for either a
significant loss of revenue or a significant unanticipated expenditure by the
State.

                  At any given time, there are various numbers of claims and
cases pending against the State, State agencies and employees seeking recovery
of monetary damages that are primarily paid out of the fund created pursuant to
the New Jersey Tort Claims Act. In addition at any given time, there are various
numbers of contract claims against the State and State agencies seeking recovery
of monetary damages. The state is unable to estimate its exposure for these
claims.


   
                                 PUBLIC OFFERING
    

                  OFFERING PRICE. The secondary market Public Offering Price per
Unit is computed by adding to the aggregate bid price of the Bonds in the Trust
divided by the number of Units outstanding, an amount based on the applicable
sales charge times the aggregate offering price of the Bonds (see "Public
Offering Price" in Part A for the applicable sales charge for the Trust). A
proportionate share of accrued interest on the Bonds to the expected date of
settlement for the Units is added to the Public Offering Price. Accrued interest
is the accumulated and unpaid interest on a Bond from the last day on which
interest was paid and is accounted for daily by the Trust at the initial daily
rate set forth under "Summary of Essential Information" in Part A of this
Prospectus. This daily rate is net of estimated fees and expenses. The Public
Offering Price can vary on a daily basis from the amount stated in Part A in
accordance with fluctuations in the prices of the Bonds and the price to be paid
by each investor will be computed as of the date the Units are purchased. The
aggregate bid price evaluation of the Bonds is determined in the manner set
forth under "Trustee Redemption."

                  The Evaluator may obtain current bid or offering prices for
the Bonds from investment dealers or brokers (including the Sponsor) that
customarily deal in tax-exempt obligations or from any other reporting service
or source of information which the Evaluator deems appropriate.

                  The sales charge computed by the Evaluator is based upon the
number of years remaining to maturity of each Bond. Bonds will be deemed to
mature on their stated maturity dates unless bonds have been called for
redemption, funds have been placed in escrow to redeem them on an earlier call
date or are subject to a "mandatory put," in which case the maturity will be
deemed to be such other date.

   
                  The table below sets forth the various sales charges based on
the length of maturity of each Bond:
    

                                     As Percent of Public
Time to Maturity                        Offering Price
- ----------------                     --------------------

less than 6 months                            0%
6 mos. to 1 year                              1%
over 1 yr. to 2 yrs.                        1 1/2%
over 2 yrs. to 4 yrs.                       2 1/2%
over 4 yrs. to 8 yrs.                       3 1/2%
over 8 yrs. to 15 yrs.                      4 1/2%
over 15 years                               5 1/2%




                                      -35-
112677.5 

<PAGE>



                  ACCRUED INTEREST. An amount of accrued interest which
represents accumulated unpaid or uncollected interest on a Bond from the last
day on which interest was paid thereon will be added to the Public Offering
Price and paid by the Certificateholder at the time Units are purchased. Since
the Trust normally receives the interest on Bonds twice a year and the interest
on the Bonds in the Trust is accrued on a daily basis (net of estimated fees and
expenses), the Trust will always have an amount of interest accrued but not
actually received and distributed to Certificateholders. A Certificateholder
will not recover his proportionate share of accrued interest until the Units are
sold or redeemed, or the Trust is terminated. At that time, the
Certificateholder will receive his proportionate share of the accrued interest
computed to the settlement date in the case of a sale or termination and to the
date of tender in the case of redemption.

   
                  EMPLOYEE DISCOUNTS. Employees (and their immediate families)
of Reich & Tang Distributors L.P. and its affiliates, Gruntal & Co. L.L.C. and
of any underwriter of a Trust, pursuant to employee benefit arrangements, may
purchase Units of a Trust at a price equal to the offering side evaluation of
the underlying securities in a Trust during the initial offering period and at
the bid side thereafter, divided by the number of Units outstanding plus a
reduced charge. Such arrangements result in less selling effort and selling
expenses than sales to employee groups of other companies. Resales or transfers
of Units purchased under the employee benefit arrangements may only be made
through the Sponsor's secondary market, so long as it is being maintained.
    

                  DISTRIBUTION OF UNITS. Certain banks and thrifts will make
Units of the Trust available to their customers on an agency basis. A portion of
the sales charge paid by their customers is retained by or remitted to the
banks. Under the Glass-Steagall Act, banks are prohibited from underwriting
Units; however, the Glass-Steagall Act does permit certain agency transactions
and the banking regulators have indicated that these particular agency
transactions are permitted under such Act. In addition, state securities laws on
this issue may differ from the interpretations of federal law expressed herein
and banks and financial institutions may be required to register as dealers
pursuant to state law.

                  The Sponsor intends to qualify the Units for sale in
substantially all States through the Underwriters and through dealers who are
members of the National Association of Securities Dealers, Inc. Units may be
sold to dealers at prices which represent a concession of up to (a) 4% of the
Public Offering Price for the Insured Municipal Securities Trust Series, (b)
$25.00 per Unit for the Insured Municipal Securities Trust Discount Series or
(c) $33.00 per Unit, for the Insured Municipal Securities Navigator Trust,
subject to the Sponsor's right to change the dealers' concession from time to
time. In addition, for transactions of 1,000,000 Units or more, the Sponsor
intends to negotiate the applicable sales charge and such charge will be
disclosed to any such purchaser. Such Units may then be distributed to the
public by the dealers at the Public Offering Price then in effect. The Sponsor
reserves the right to reject, in whole or in part, any order for the purchase of
Units. The Sponsor reserves the right to change the discounts from time to time.

                  SPONSOR'S PROFITS. The Sponsor will receive a gross commission
on all Units sold in the secondary market equal to the applicable sales charge
on each transaction. (See "Offering Price".) In addition, in maintaining a
market for the Units (see "Sponsor Repurchase") the Sponsor will realize profits
or sustain losses in the amount of any difference between the price at which
they buy Units and the price at which they resell such Units.

                  Participants in the Total Reinvestment Plan can designate a
broker as the recipient of a dealer concession (see "Total Reinvestment Plan").


                                      -36-
112677.5 

<PAGE>



                  COMPARISON OF PUBLIC OFFERING PRICE, SPONSOR'S REPURCHASE
PRICE AND REDEMPTION PRICE. The secondary market Public Offering Price of Units
will be determined on the basis of the current bid prices of the Bonds in the
Trust, plus the applicable sales charge. The value at which Units may be resold
in the Secondary Market or redeemed will be determined on the basis of the
current bid prices of the Bonds without any sales charge. On the Evaluation
Date, the Public Offering Price and the Sponsor's initial Repurchase Price per
Unit (each based on the bid side evaluation of the Bonds in the Trust) each
exceeded the Redemption Price and the Sponsor's secondary market Repurchase
Price per Unit (based upon the current bid side evaluation of the Bonds in the
Trust) by the amounts shown under "Summary of Essential Information" in Part A
of this Prospectus. For this reason, among others (including fluctuations in the
market prices of such Bonds and the fact that the Public Offering Price includes
the applicable sales charge), the amount realized by a Certificateholder upon
any redemption of Sponsor repurchase of Units may be less than the price paid
for such Units.


             ESTIMATED LONG TERM RETURN AND ESTIMATED CURRENT RETURN


   
                  The rate of return on an investment in Units of the Trust is
measured in terms of "Estimated Current Return" and "Estimated Long Term
Return".
    

                  Estimated Long Term Return is calculated by: (1) computing the
yield to maturity or to an earlier call date (whichever results in a lower
yield) for each Bond in a Trust's portfolio in accordance with accepted bond
practices, which practices take into account not only the interest payable on
the Bond but also the amortization of premiums or accretion of discounts, if
any; (2) calculating the average of the yields for the Bonds in each Trust's
portfolio by weighing each Bond's yield by the market value of the Bond and by
the amount of time remaining to the date to which the Bond is priced (thus
creating an average yield for the portfolio of each Trust); and (3) reducing the
average yield for the portfolio of each Trust in order to reflect estimated fees
and expenses of that Trust and the maximum sales charge paid by Unitholders. The
resulting Estimated Long Term Return represents a measure of the return to
Unitholders earned over the estimated life of each Trust. The Estimated Long
Term Return as of the day prior to the Evaluation Date is stated for the Trust
under "Summary of Essential Information" in Part A.

                  Estimated Current Return is computed by dividing the Estimated
Net Annual Interest Income per Unit by the Public Offering Price per Unit. In
contrast to the Estimated Long Term Return, the Estimated Current Return does
not take into account the amortization of premium or accretion of discount, if
any, on the Bonds in the portfolios of the Trust. Moreover, because interest
rates on Bonds purchased at a premium are generally higher than current interest
rates on newly issued bonds of a similar type with comparable rating, the
Estimated Current Return per Unit may be affected adversely if such Bonds are
redeemed prior to their maturity. On the day prior to the Evaluation Date, the
Estimated Net Annual Interest Income per Unit divided by the Public Offering
Price resulted in the Estimated Current Return stated for the Trust under
"Summary of Essential Information" in Part A.

                  The Estimated Net Annual Interest Income per Unit of the Trust
will vary with changes in the fees and expenses of the Trustee and the Evaluator
applicable to the Trust and with the redemption, maturity, sale or other
disposition of the Bonds in the Trust. The Public Offering Price will vary with
changes in the bid prices of the Bonds. Therefore, there is no assurance that
the present Estimated Current Return or Estimated Long Term Return will be
realized in the future.


                                      -37-
112677.5 

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                  A schedule of cash flow projections is available from the
Sponsor upon request.


                          RIGHTS OF CERTIFICATEHOLDERS

                  CERTIFICATES. Ownership of Units of the Trust is evidenced by
registered Certificates executed by the Trustee and the Sponsor. Certificates
may be issued in denominations of one or more Units and will bear appropriate
notations on their faces indicating which plan of distribution has been selected
by the Certificateholder. Certificates are transferable by presentation and
surrender to the Trustee properly endorsed and/or accompanied by a written
instrument or instruments of transfer. Although no such charge is presently made
or contemplated, the Trustee may require a Certificateholder to pay $2.00 for
each Certificate reissued or transferred and any governmental charge that may be
imposed in connection with each such transfer or interchange. Mutilated,
destroyed, stolen or lost Certificates will be replaced upon delivery of
satisfactory indemnity and payment of expenses incurred.

                  INTEREST AND PRINCIPAL DISTRIBUTIONS. Interest received by the
Trust is credited by the Trustee to an Interest Account and a deduction is made
to reimburse the Trustee without interest for any amounts previously advanced.
Proceeds representing principal received from the maturity, redemption, sale or
other disposition of the Bonds are credited to a Principal Account.

                  Distributions to each Certificateholder from the Interest
Account are computed as of the close of business on each Record Date for the
following Payment Date and consist of an amount substantially equal to
one-twelfth, one-half or all of such Certificateholder's pro rata share of the
Estimated Net Annual Interest Income in the Interest Account, depending upon the
applicable plan of distribution. Distributions from the Principal Account (other
than amounts representing failed contracts, as previously discussed) will be
computed as of each semi-annual Record Date, and will be made to the
Certificateholders on or shortly after the next semi-annual Payment Date.
Proceeds representing principal received from the disposition of any of the
Bonds between a Record Date and a Payment Date which are not used for
redemptions of Units will be held in the Principal Account and not distributed
until the second succeeding semi-annual Payment Date. No distributions will be
made to Certificateholders electing to participate in the Total Reinvestment
Plan. Persons who purchase Units between a Record Date and a Payment Date will
receive their first distribution on the second Payment Date after such purchase.

                  Because interest payments are not received by the Trust at a
constant rate throughout the year, interest distributions may be more or less
than the amount credited to the Interest Account as of a given Record Date. For
the purpose of minimizing fluctuations in the distributions from the Interest
Account, the Trustee will advance sufficient funds, without interest, as may be
necessary to provide interest distributions of approximately equal amounts. All
funds in respect of the Bonds received and held by the Trustee prior to
distribution to Certificateholders may be of benefit to the Trustee and do not
bear interest to Certificateholders.

                  As of the first day of each month, the Trustee will deduct
from the Interest Account, and, to the extent funds are not sufficient therein,
from the Principal Account, amounts necessary to pay the expenses of the Trust
(as determined on the basis set forth under "Trust Expenses and Charges"). The
Trustee also may withdraw from said accounts such amounts, if any, as it deems
necessary to establish a reserve for any applicable taxes or other governmental
charges that may be payable out of the Trust. Amounts so

                                      -38-
112677.5 

<PAGE>



withdrawn shall not be considered a part of the Trust's assets until such time
as the Trustee shall return all or any part of such amounts to the appropriate
accounts. In addition, the Trustee may withdraw from the Interest and Principal
Accounts such amounts as may be necessary to cover purchases of Replacement
Bonds and redemptions of Units by the Trustee.

                  The estimated monthly, semi-annual or annual interest
distribution per Unit will initially be in the amount shown under Summary of
Essential Information and will change and may be reduced as Bonds mature or are
redeemed, exchanged or sold, or as expenses of the Trust fluctuate. No
distribution need be made from the Principal Account until the balance therein
is an amount sufficient to distribute $1.00 per Unit.

                  DISTRIBUTION ELECTIONS. Interest is distributed monthly,
semi-annually or annually, depending upon the distribution plan applicable to
the Unit purchased. Record Dates are the first day of each month for monthly
distributions, the first day of each June and December for semi-annual
distributions and the first day of each December for annual distributions.
Payment Dates will be the fifteenth day of each month following the respective
Record Dates.

                  Certificateholders purchasing Units in the secondary market
will initially receive distributions in accordance with the election of the
prior owner. Every October each Certificateholder may change his distribution
election by notifying the Trustee in writing of such change between October 1
and November 1 of each year. (Certificateholders deciding to change their
election should contact the Trustee by calling the number listed on the back
cover hereof for information regarding the procedures that must be followed in
connection with this written notification of the change of election.) Failure to
notify the Trustee on or before November 1 of each year will result in a
continuation of the plan for the following 12 months.

                  RECORDS. The Trustee shall furnish Certificateholders in
connection with each distribution a statement of the amount of interest, if any,
and the amount of other receipts, if any, which are being distributed, expressed
in each case as a dollar amount per Unit. Within a reasonable time after the end
of each calendar year the Trustee will furnish to each person who at any time
during the calendar year was a Certificateholder of record, a statement showing
(a) as to the Interest Account: interest received (including amounts
representing interest received upon any disposition of Bonds and earned original
issue discount, if any), amounts paid for purchases of Replacement Bonds and
redemptions of Units, if any, deductions for applicable taxes and fees and
expenses of the Trust, and the balance remaining after such distributions and
deductions, expressed both as a total dollar amount and as a dollar amount
representing the pro rata share of each Unit outstanding on the last business
day of such calendar year; (b) as to the Principal Account: the dates of
disposition of any Bonds and the net proceeds received therefrom (including any
unearned original issue discount but excluding any portion representing accrued
interest), deductions for payments of applicable taxes and fees and expenses of
the Trust, amounts paid for purchases of Replacement Bonds and redemptions of
Units, if any, and the balance remaining after such distributions and
deductions, expressed both as a total dollar amount and as a dollar amount
representing the pro rata share of each Unit outstanding on the last business
day of such calendar year; (c) a list of the Bonds held and the number of Units
outstanding on the last business day of such calendar year; (d) the Redemption
Price per Unit based upon the last computation thereof made such calendar year;
and (e) amounts actually distributed to Certificateholders during such calendar
year from the Interest and Principal Accounts, separately stated, expressed both
as total dollar amounts representing the pro rata share of each Unit outstanding
on the last business day of such calendar year.


                                      -39-
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<PAGE>



                  The Trustee shall keep available for inspection by
Certificateholders at all reasonable times during usual business hours, books of
record and account of its transactions as Trustee, including records of the
names and addresses of Certificateholders, Certificates issued or held, a
current list of Bonds in the portfolio and a copy of the Trust Agreement.


                                   TAX STATUS


                  All Bonds acquired by each Trust were accompanied by copies of
opinions of bond counsel to the issuing governmental authorities given at the
time of original delivery of the Bonds to the effect that the interest thereon
is exempt from regular federal income tax. Such interest may, however, be
subject to the federal corporate alternative minimum tax and to state and local
taxes. Neither the Sponsor nor the Trustee nor their respective counsel have
made any review of the proceedings relating to the issuance of the Bonds or the
bases for such opinion and express no opinion as to these matters, and neither
the Trustee nor the Sponsor nor their respective counsel has made an independent
examination or verification that the federal income tax status of the Bonds has
not been altered since the time of the original delivery of those opinions.

                  In rendering the opinion set forth below, counsel has examined
the Agreement, the final form of Prospectus dated the date hereof (the
"Prospectus") and the documents referred to therein, among others, and has
relied on the validity of said documents and the accuracy and completeness of
the facts set forth therein.

                  In the opinion of Battle Fowler LLP, counsel for the Sponsor,
under existing law:

                   The Trusts are not associations taxable as corporations for
                   federal income tax purposes under the Internal Revenue Code
                   of 1986 (the "Code"), and income received by the Trusts that
                   consists of interest excludable from federal gross income
                   under the Code will be excludable from the federal gross
                   income of the Certificateholders of such Trusts.

                   Each Certificateholder will be considered the owner of a pro
                   rata portion of the Trust under Section 676(a) of the Code.
                   Thus, each Certificateholder will be considered to have
                   received his pro rata share of Bond interest when it is
                   received by that Trust, and the net income distributable to
                   Certificateholders that is exempt from federal income tax
                   when received by that Trust will constitute tax-exempt income
                   when received by the Certificateholders.

                   Gain (other than any earned original issue discount) realized
                   on a sale or redemption of the Bonds or on a sale of a Unit
                   is, however, includable in gross income for federal income
                   tax purposes, generally as capital gain, although gain on the
                   disposition of a Bond or a Unit purchased at a market
                   discount generally will be treated as ordinary income, rather
                   than capital gain, to the extent of accrued market discount.
                   (It should be noted in this connection that such gain does
                   not include any amounts received in respect of accrued
                   interest.) Such gain may be long or short-term depending on
                   the facts and circumstances. Capital losses are deductible to
                   the extent of capital gains; in addition, up to $3,000 of
                   capital losses of non-corporate Certificateholders may be
                   deducted against ordinary income. Capital assets must be held
                   for more than one year to qualify for long-term capital gain
                   treatment.


                                      -40-
112677.5 

<PAGE>



                   Each Certificateholder will realize taxable income or loss
                   when the Trust disposes of a Bond (whether by sale, exchange,
                   redemption or payment at maturity), as if the
                   Certificateholder had directly disposed of his pro rata share
                   of such Bond. The gain or loss is measured by the difference
                   between (i) the tax cost of such pro rata share and (ii) the
                   amount received therefor. For this purpose, a
                   Certificateholder's per Unit tax cost for each Bond is
                   determined by allocating the total tax cost of each Unit
                   among all the Bonds held in the Trust (in accordance with the
                   portion of the Trust comprised by each Bond). In order to
                   determine the amount of taxable gain or loss, the
                   Certificateholder's amount received is similarly allocated at
                   that time. The Certificateholder may exclude from the amount
                   received any amounts that represent accrued interest or the
                   earned portion of any original issue discount but may not
                   exclude amounts attributable to market discount. Thus, when a
                   Bond is disposed of by a Trust at a gain, taxable gain will
                   equal the difference between (i) the amount received and (ii)
                   the amount paid plus any original issue discount (limited, in
                   the case of Bonds issued after June 8, 1980, to the portion
                   earned from the date of acquisition to the date of
                   disposition). Gain on the disposition of a Bond purchased at
                   a market discount generally will be treated as ordinary
                   income, rather than capital gain, to the extent of accrued
                   market discount. No deduction is allowed for the amortization
                   of bond premium on tax-exempt bonds, such as the Bonds, in
                   computing regular federal income tax.

                   Discount generally accrues based on the principle of
                   compounding of accrued interest, not on a straight-line or
                   ratable method, with the result that the amount of earned
                   original issue discount is less in the earlier years and more
                   in the later years of a bond term. The tax basis of a
                   discount bond is increased by the amount of accrued,
                   tax-exempt original issue discount thus determined. This
                   method of calculation will produce higher capital gains (or
                   lower losses) to a Certificateholder, as compared to the
                   results produced by the straight-line method of accounting
                   for original issue discount, upon an early disposition of a
                   Bond by the Trust or of a Unit by a Certificateholder.

                   A Certificateholder may also realize taxable gain or loss
                   when a Unit is sold or redeemed. The amount received is
                   allocated among all the Bonds in a particular Trust in the
                   same manner as when that Trust disposes of Bonds and the
                   Certificateholder may exclude accrued interest and the earned
                   portion of any original issue discount (but not amounts
                   attributable to market discount). The return of a
                   Certificateholder's tax cost is otherwise a tax-free return
                   of capital.

                   A portion of social security benefits is includable in gross
                   income for taxpayers whose "modified adjusted gross income"
                   combined with a portion of their benefits exceeds a base
                   amount. The base amount is $25,000 for an individual, $32,000
                   for a married couple filing a joint return and zero for
                   married persons filing separate returns. Interest on
                   tax-exempt bonds is to be added to adjusted gross income for
                   purposes of computing the amount of Social Security benefits
                   that are includable in gross income and determining whether
                   an individual's income exceeds the base amount above which a
                   portion of the benefits would be subject to tax.

                   Corporate Certificateholders are required to include in
                   federal corporate alternative minimum taxable income 75
                   percent of the amount by which the adjusted current earnings
                   (which will include tax-exempt interest) of the corporation
                   exceeds alternative minimum taxable income (determined
                   without regard to this item). In addition, in certain cases,
                   Subchapter S corporations with accumulated earnings and
                   profits from Subchapter C years will be subject to a minimum
                   tax on excess "passive investment income" which includes
                   tax-exempt interest.

                                      -41-
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<PAGE>




                   Under federal law, interest on Navigator Trust-held Bonds
                   issued by authority of the Government of Puerto Rico is
                   exempt from regular federal income tax, and state and local
                   income tax in the United States and Puerto Rico. The New York
                   Navigator Insured Trust is not subject to the New York State
                   Franchise Tax on Business Corporations or the New York City
                   General Corporation Tax. Under the personal income tax laws
                   of the State and City of New York, the income of the New York
                   Navigator Insured Trust will be treated as the income of the
                   Certificateholders. Interest on the Bonds of the New York
                   Navigator Insured Trust that is exempt from tax under the
                   laws of the State and City of New York when received by the
                   Trust will retain its status as tax-exempt interest to its
                   Certificateholders. In addition, non-residents of New York
                   City will not be subject to the New York City personal income
                   tax on gains derived with respect to their Units of the New
                   York Navigator Insured Trust. Non-residents of New York State
                   will not be subject to New York State personal income tax on
                   such gains unless the Units are employed in a business, trade
                   or occupation carried on in New York State. A New York State
                   or New York City resident should determine his basis and
                   holding periods for his Units in the same manner for New York
                   State and New York City tax purposes as for federal tax
                   purposes. For corporations doing business in New York State,
                   interest earned on state and municipal obligations that are
                   exempt from federal income tax, including obligations of New
                   York State, its political subdivisions and instrumentalities,
                   must be included in calculating New York State and New York
                   City entire net income for purposes of calculating New York
                   State and New York City franchise (income) tax.

                   The Insured Municipal Securities Trust is not subject to the
                   New York State Franchise Tax on Business Corporations or the
                   New York City General Corporation Tax. For a
                   Certificateholder who is a New York resident, however, a pro
                   rata portion of all or part of the income of the Trust will
                   be treated as the income of the Certificateholder under the
                   income tax laws of the State and City of New York. Similar
                   treatment may apply in other states.

                  The exemption of interest on municipal obligations for federal
income tax purposes does not necessarily result in exemption under the income
tax laws of any state or political subdivision. In general, municipal bond
interest exempt from federal income tax is taxable income to residents of the
State or City of New York under the tax laws of those jurisdictions unless the
bonds are issued by the State of New York or one of its political subdivisions
or by the Commonwealth of Puerto Rico or one of its political subdivisions. For
corporations doing business in New York State, interest earned on state and
municipal obligations that are exempt from federal income tax, including
obligations of New York State, its political subdivisions and instrumentalities,
must be included in calculating New York State and New York City entire net
income for purposes of calculating New York State and New York City franchise
(income) tax. The laws of the several states and local taxing authorities vary
with respect to the taxation of such obligations and each Certificateholder is
advised to consult his own tax advisor as to the tax consequences of his
Certificates under state and local tax laws.

                   Any proceeds received pursuant to the terms of the insurance
                   on the Bonds that represent maturing interest on defaulted
                   obligations will be excludable from federal gross income if,
                   and to the same extent that, such interest would have been so
                   excludable if paid by the issuers of such defaulted
                   obligations.

                  In the opinion of Freeman, Zeller & Bryant, special counsel to
the Sponsor on New Jersey tax matters, which opinion is made in reliance upon
certain information and based on certain assumptions respecting the New Jersey

                                      -42-
112677.5 

<PAGE>



Navigator Trust, under existing New Jersey law applicable to individuals who are
New Jersey residents and New Jersey estates and trusts:

                           (1) The New Jersey Navigator Trust will be recognized
                  as a trust and not as an association taxable as a corporation.
                  The New Jersey Navigator Trust will not be subject to the New
                  Jersey Corporation Business Tax or the New Jersey Corporation
                  Income Tax.

                           (2) The income of the New Jersey Navigator Trust will
                  be treated as income of the Certificateholders who are
                  individuals, estates or trusts under the New Jersey Gross
                  Income Tax Act, N.J.S.A. 54A: 1-1 et seq. (the "Act").
                  Interest on the Bonds that is exempt from tax under the Act
                  when received by the New Jersey Navigator Trust will retain
                  its status as tax-exempt interest under the Act when
                  distributed to Certificateholders who are individuals, estates
                  or trusts.

                           (3) Certificateholders, who are individuals, estates,
                  or trusts will not be subject to the Act on any gain realized
                  when the New Jersey Navigator Trust disposes of a Bond
                  (whether by sale, exchange, redemption, or payment at
                  maturity). Any loss realized on such disposition may not be
                  utilized to offset gains realized by such Certificateholder on
                  the disposition of assets the gain on which is subject to the
                  New Jersey Gross Income Tax.

                           (4) The sale, exchange or redemption of a Unit by a
                  Certificateholder shall be treated as a sale or exchange of a
                  Certificateholder's pro rata interest in the assets in the New
                  Jersey Navigator Trust at the time of the transaction and any
                  gain will be exempt from tax under the Act to the extent that
                  the price received by the selling Certificateholder who is an
                  individual, estate or trust does not exceed the Redemption
                  Price. To the extent that the amount received by the
                  Certificateholder exceeds the Redemption Price, any such gain
                  will not be exempt from tax under the Act.

                           (5) All proceeds representing interest on defaulted
                  obligations derived by Certificateholders who are individuals,
                  estates or trusts from an insurance policy, either paid
                  directly to the Certificateholder or through the New Jersey
                  Navigator Trust, are exempt from tax under the Act.

                           (6)  The Units of the New Jersey Navigator Trust may
                  be taxable in the estates of New Jersey residents under the
                  New Jersey Transfer Inheritance Tax Law or the New Jersey
                  Estate Tax Laws.

                           (7) If a Certificateholder is a corporation subject
                  to the New Jersey Corporation Business Tax or New Jersey
                  Corporation Income Tax, interest from the Bonds in the New
                  Jersey Navigator Trust which is allocable to such corporation
                  will be includable in its entire net income for purposes of
                  the New Jersey Corporation Business Tax or New Jersey
                  Corporation Income Tax, less any interest expense incurred to
                  carry such investment to the extent such interest expense has
                  not been deducted in computing Federal taxable income. Net
                  gains derived by such corporation on

                                      -43-
112677.5 

<PAGE>



                  the disposition of the Bonds by the New Jersey Navigator Trust
                  or on the disposition of its Units will be included in its
                  entire net income for purposes of the New Jersey Corporation
                  Business Tax or New Jersey Corporation Income Tax. Any
                  proceeds paid under the insurance policy issued to the Trustee
                  of the New Jersey Navigator Trust with respect to the Bonds or
                  under individual policies obtained by issuers of Bonds which
                  represent maturing interest or maturing principal on defaulted
                  obligations held by the Trustee will be included in its entire
                  net income for purposes of the New Jersey Corporation Business
                  Tax or New Jersey Corporation Income Tax if, and to the same
                  extent as, such interest or proceeds would have been so
                  included if paid by the issuer of the defaulted obligations.


                  In the case of Bonds that are Industrial Revenue Bonds
("IRBs") or certain types of private activity bonds, the opinions of bond
counsel to the respective issuing authorities indicate that interest on such
Bonds is exempt from regular federal income tax. However, interest on such Bonds
will not be exempt from regular federal income tax for any period during which
such Bonds are held by a "substantial user" of the facilities financed by the
proceeds of such Bonds or by a "related person" thereof within the meaning of
the Code. Therefore, interest on any such Bonds allocable to a Certificateholder
who is such a "substantial user" or "related person" thereof will not be
tax-exempt. Furthermore, in the case of IRBs that qualify for the "small issue"
exemption, the "small issue" exemption will not be available or will be lost if,
at any time during the three-year period beginning on the later of the date the
facilities are placed in service or the date of issue, all outstanding
tax-exempt IRBs, together with a proportionate share of any present issue, of an
owner or principal user (or related person) of the facilities exceeds
$40,000,000. In the case of IRBs issued under the $10,000,000 "small issue"
exemption, interest on such IRBs will become taxable if the face amount of the
IRBs plus certain capital expenditures exceeds $10,000,000.

                  In addition, a Bond can lose its tax-exempt status as a result
of other subsequent but unforeseeable events such as prohibited "arbitrage"
activities by the issuer of the Bond or the failure of the Bond to continue to
satisfy the conditions required for the exemption of interest thereon from
regular federal income tax. No investigation has been made as to the current or
future owners or users of the facilities financed by the Bonds, the amount of
such persons' outstanding tax-exempt IRBs, or the facilities themselves, and no
assurance can be given that future events will not affect the tax-exempt status
of the Bonds. Investors should consult their tax advisors for advice with
respect to the effect of these provisions on their particular tax situation.

                  Interest on indebtedness incurred or continued to purchase or
carry the Units is not deductible for regular federal income tax purposes.
However, such interest is deductible for New York State and New York City income
tax purposes by corporations that are required to include interest on the Bonds
in New York State and New York City entire net income for purposes of
calculating New York State and City franchise (income) taxes. In addition, under
rules used by the Internal Revenue Service for determining when borrowed funds
are considered used for the purpose of purchasing or carrying particular assets,
the purchase of Units may be considered to have been made with borrowed funds
even though the borrowed funds are not directly traceable to the purchase of
Units. Also, in the case of certain financial institutions that acquire Units,
in general no deduction is allowed for interest expense allocable to the Units.


                                      -44-
112677.5 

<PAGE>



                  From time to time proposals have been introduced before
Congress to restrict or eliminate the federal income tax exemption for interest
on debt obligations similar to the Bonds in the Trust, and it can be expected
that similar proposals may be introduced in the future. In particular, Congress
may consider the adoption of some form of "flat tax," which could have an
adverse impact on the value of tax-exempt bonds.

                  In South Carolina v. Baker, the U.S. Supreme Court held that
the federal government may constitutionally require states to register bonds
they issue and subject the interest on such bonds to federal income tax if not
registered, and that there is no constitutional prohibition against the federal
government's taxing the interest earned on state or other municipal bonds. The
Supreme Court decision affirms the authority of the federal government to
regulate and control bonds such as the Bonds in the Trust and to tax interest on
such bonds in the future. The decision does not, however, affect the current
exemption from taxation of the interest earned on the Bonds in the Trust in
accordance with Section 103 of the Code.

                  The opinions of bond counsel or special tax counsel to the
issuing governmental authorities to the effect that interest on the Bonds is
exempt from regular federal income tax may be limited to law existing at the
time the Bonds were issued, and may not apply to the extent that future changes
in law, regulations or interpretations affect such Bonds. Investors are advised
to consult their own tax advisors for advice with respect to the effect of any
legislative changes.


                                    LIQUIDITY

                  SPONSOR REPURCHASE. The Sponsor, although not obligated to do
so, intends to maintain a secondary market for the Units and continuously to
offer to repurchase the Units. The Sponsor's secondary market repurchase price,
after the initial public offering is completed, will be based on the aggregate
bid price of the Bonds in the Trust portfolio, determined by the Evaluator on a
daily basis, and will be the same as the redemption price. The aggregated bid
price, determined by the Evaluator on a daily basis, is computed on the basis
set forth under "Trustee Redemption". Certificateholders who wish to dispose of
their Units should inquire of the Sponsor as to current market prices prior to
making a tender for redemption. The Sponsor may discontinue repurchase of Units
if the supply of Units exceeds demand, or for other business reasons. The date
of repurchase is deemed to be the date on which Certificates representing Units
are physically received in proper form by Reich & Tang Distributors L.P., 600
Fifth Avenue, New York, New York 10020 on behalf of the Sponsor. Units received
after 4 P.M., New York Time, will be deemed to have been repurchased on the next
business day. In the event a market is not maintained for the Units, a
Certificateholder may be able to dispose of Units only by tendering them to the
Trustee for redemption.


                  Prospectuses relating to certain other bond trusts indicate an
intention by the respective Sponsor, subject to change, to repurchase units on
the basis of a price higher than the bid prices of the bonds in the trusts.
Consequently, depending on the prices actually paid, the secondary market
repurchase price of other trusts may be computed on a somewhat more favorable
basis than the repurchase price offered by the Sponsor for units of this Trust,
although in all bond trusts, the purchase price of a unit depends primarily on
the value of the bonds in the trust portfolio.

                  Units purchased by the Sponsor in the secondary market may be
re-offered for sale by the Sponsor at a price based on the aggregate bid price
of the Bonds in the Trust plus the applicable sales charge (see "Public Offering
Price" in Part A) plus net accrued interest. Any Units that are

                                      -45-
112677.5 

<PAGE>



purchased by the Sponsor in the secondary market also may be redeemed by the
Sponsor if it determines such redemption to be in its best interest.

                  The Sponsor may, under certain circumstances, as a service to
Certificateholders, elect to purchase any Units tendered to the Trustee for
redemption (see "Trustee Redemption"). Factors which the Sponsor will consider
in making a determination will include the number of Units of all Trust which it
has in inventory, its estimate of the salability and the time required to sell
such Units and general market conditions. For example, if in order to meet
redemptions of Units the Trustee must dispose of Bonds, and if such disposition
cannot be made by the redemption date (seven calendar days after tender), the
Sponsor may elect to purchase such Units. Such purchase shall be made by payment
to the Certificateholder not later than the close of business on the redemption
date of an amount equal to the Redemption Price on the date of tender.

                  TRUSTEE REDEMPTION. Units may also be tendered to the Trustee
for redemption at its corporate trust office as set forth in Part A of this
Prospectus, upon proper delivery of Certificates representing such Units and
payment of any relevant tax. At the present time there are no specific taxes
related to the redemption of Units. No redemption fee will be charged by the
Sponsor or the Trustee. Units redeemed by the Trustee will be cancelled.

                  Certificates representing Units to be redeemed must be
delivered to the Trustee and must be properly endorsed or accompanied by proper
instruments of transfer with signature guaranteed (or by providing satisfactory
indemnity, as in the case of lost, stolen or mutilated Certificates). Thus,
redemptions of Units cannot be effected until Certificates representing such
Units have been delivered by the person seeking redemption. (See
"Certificates".) Certificateholders must sign exactly as their names appear on
the faces of their Certificates. In certain instances the Trustee may require
additional documents such as, but not limited to, trust instruments,
certificates of death, appointments as executor or administrator or certificates
of corporate authority.

   
                  Within three business days following a tender for redemption,
the Certificateholder will be entitled to receive in cash an amount for each
Unit tendered equal to the Redemption Price per Unit computed as of the
Evaluation Time set forth under "Summary of Essential Information" in Part A on
the date of tender. The "date of tender" is deemed to be the date on which Units
are received by the Trustee, except that with respect to Units received after
the close of trading on the New York Stock Exchange, the date of tender is the
next day on which such Exchange is open for trading, and such Units will be
deemed to have been tendered to the Trustee on such day for redemption at the
Redemption Price computed on that day.
    

                  Accrued interest paid on redemption shall be withdrawn from
the Interest Account, or, if the balance therein is insufficient, from the
Principal Account. All other amounts paid on redemption shall be withdrawn from
the Principal Account. The Trustee is empowered to sell Bonds in order to make
funds available for redemptions. Such sales, if required, could result in a sale
of Bonds by the Trustee at a loss. To the extent Bonds are sold, the size and
diversity of the Trust will be reduced.

                  The Redemption Price per Unit is the pro rata share of each
Unit in the Trust determined by the Trustee on the basis of (i) the cash on hand
in the Trust or moneys in the process of being collected, (ii) the value of the
Bonds in the Trust based on the bid prices of such Bonds and (iii) interest
accrued thereon, less (a) amounts representing taxes or other governmental
charges payable out of the Trust, (b) the accrued expenses of the Trust and (c)
cash allocated for the distribution to Certificateholders of record as of the
business day prior to the evaluation being made. The Evaluator may

                                      -46-
112677.5 

<PAGE>



determine the value of the Bonds in the Trust (1) on the basis of current bid
prices of the Bonds obtained from dealers or brokers who customarily deal in
bonds comparable to those held by the Trust, (2) on the basis of bid prices for
bonds comparable to any Bonds for which bid prices are not available, (3) by
determining the value of the Bonds by appraisal, or (4) by any combination of
the above. The Evaluator will determine the aggregate current bid price
evaluation of the Bonds in the Trust, taking into account the market value of
the Bonds insured under the Bond Insurance Policy, in the manner described as
set forth under "Public Offering--Offering Price". Insurance does not guarantee
the market value of the Bonds or the Units, and while Bond insurance represents
an element of market value in regard to insured Bonds, its exact effect, if any,
on market value cannot be predicted.

                  The Trustee is irrevocably authorized in its discretion, if
the Sponsor does not elect to purchase a Unit tendered for redemption or if the
Sponsor tenders a Unit for redemption, in lieu of redeeming such Unit, to sell
such Unit in the over-the-counter market for the account of the tendering
Certificateholder at prices which will return to the Certificateholder an amount
in cash, net after deducting brokerage commissions, transfer taxes and other
charges, equal to or in excess of the Redemption Price for such Unit. The
Trustee will pay the net proceeds of any such sale to the Certificateholder on
the day he would otherwise be entitled to receive payment of the Redemption
Price.

                  The Trustee reserves the right to suspend the right of
redemption and to postpone the date of payment of the Redemption Price per Unit
for any period during which the New York Stock Exchange is closed, other than
customary weekend and holiday closings, or trading on that Exchange is
restricted or during which (as determined by the Securities and Exchange
Commission) an emergency exists as a result of which disposal or evaluation of
the Bonds is not reasonably practicable, or for such other periods as the
Securities and Exchange Commission may by order permit. The Trustee and the
Sponsor is not liable to any person or in any way for any loss or damage which
may result from any such suspension or postponement.

                  A Certificateholder who wishes to dispose of his Units should
inquire of his bank or broker in order to determine if there is a current
secondary market price in excess of the Redemption Price.


                             TOTAL REINVESTMENT PLAN


   
                  Under the Total Reinvestment Plan (the "Plan"), semi-annual
and annual Certificateholders (except Texas residents*) may elect to have all
interest and principal distributions, if any, with respect to their Units
reinvested either in units of various series of "Insured Municipal Securities
Trust" or "Municipal Securities Trust" which will have been created shortly
before each semi-annual or annual Payment Date (a "Primary Series") or, if units
of a Primary Series are not available, in units of a previously formed series of
the Trust which have been repurchased by the Sponsor in the secondary market or
which constitute a portion of the Units of the Trust not sold by the Sponsor
prior to such Payment Date (a "Secondary Series") (Primary Series and Secondary
Series are hereafter collectively referred to as "Available Series"). Series of
"Municipal Securities Trust" do not have insurance. The first interest
distribution to Certificateholders cannot be reinvested unless such distribution
is scheduled for June 15 or December 15 in
- --------
*        Texas residents may elect to participate in the "Total Reinvestment
         Plan for Texas Residents" hereinafter described.
    


                                      -47-
112677.5 

<PAGE>



the case of semi-annual Certificateholders or December 15 in the case of annual
Certificateholders (each such date being referred to herein as the "Plan
Reinvestment Date").

                  Under the Plan (subject to compliance with applicable blue sky
laws), fractional units ("Plan Units") will be purchased from the Sponsor at a
price equal to the aggregate offering price per Unit of the bonds in the
Available Series portfolio during the initial offering of the Available Series
or at the aggregate bid price per Unit of the Available Series if its initial
offering has been completed, plus a sales charge equal to 3.627% of the net
amount invested in such bonds or 3.50% of the Reinvestment Price per Plan Unit,
plus accrued interest, divided by one hundred (the "Reinvestment Price per Plan
Unit"). All Plan Units will be sold at this reduced sales charge of 3.50% in
comparison to the regular sales charge on primary and secondary market sales of
Units in any series of "Municipal Securities Trust". Participants in the Plan
will have the opportunity to designate, in the Authorization Form for the Plan,
the name of a broker to whom the Sponsor will allocate a sales commission of
1.50% of the Reinvestment Price per Plan Unit, payable out of the 3.50% sales
charge. If no such designation is made, the Sponsor will retain the sales
commission.

   
                  Under the Plan, the entire amount of a participant's income
and principal distributions will be reinvested. For example, a Certificateholder
who is entitled to receive $130.50 interest income from the Trust would acquire
13.05 Plan Units assuming that the Reinvestment Price per Plan Unit, plus
accrued interest, approximated $10.
    

                  A semi-annual or annual Certificateholder may join the Plan at
the time he invests in Units of the Trust or any time thereafter by delivering
to the Trustee an Authorization Form which is available from brokers, any
Underwriter of the Units or the Sponsor. In order that distributions may be
reinvested on a particular Plan Reinvestment Date, the Authorization Form must
be received by the Trustee not later than the 15th day of the month preceding
such Date. Authorization Forms not received in time for a particular Plan
Reinvestment Date will be valid only for the second succeeding Plan Reinvestment
Date. Similarly, a participant may withdraw from the program at any time by
notifying the Trustee (see below). However, if written confirmation of
withdrawal is not given to the Trustee prior to a particular distribution, the
participant will be deemed to have elected to participate in the Plan with
respect to that particular distribution and his withdrawal would become
effective for the next succeeding distribution.

                  Once delivered to the Trustee, an Authorization Form will
constitute a valid election to participate in the Plan with respect to Units
purchased in the Trust (and with respect to Plan Units purchased with the
distributions from the Units purchased in the Trust) for each subsequent
distribution so long as the Certificateholder continues to participate in the
Plan. However, if an Available Series should materially differ from the Trust in
the opinion of the Sponsor, the authorization will be voided and participants
will be provided with both a notice of the material change and a new
Authorization Form which would have to be returned to the Trustee before the
Certificateholder would again be able to participate in the Plan. The Sponsor
anticipates that a material difference which would result in a voided
authorization would include such facts as the inclusion of bonds in the
Available Series portfolio the interest income on which was not exempt from all
federal income tax, or the inclusion of bonds which were not rated "A" or better
by Standard & Poor's Corporation or Moody's Investors Service, Inc. on the date
such bonds were initially deposited in the Available Series portfolio.

                  The Sponsor has the option at any time to use units of a
Secondary Series to fulfill the requirements of the Plan in the event units of a
Primary

                                      -48-
112677.5 

<PAGE>



Series are not available either because a Primary Series is not then in
existence or because the registration statement relating thereto is not declared
effective in sufficient time to distribute final prospectuses to Plan
participants (see below). It should be noted that there is no assurance that the
quality and diversification of the Bonds in any Available Series or the
estimated current return thereon will be similar to that of this Trust.

                  It is the Sponsor's intention that Plan Units will be offered
on or about each semi-annual and annual Record Date for determining who is
eligible to receive distributions on the related Payment Date. Such Record Dates
are June 1 and December 1 of each year for semi-annual Certificateholders, and
December 1 of each year for annual Certificateholders. On each Record Date the
Sponsor will send a current Prospectus relating to the Available Series being
offered for the next Plan Reinvestment Date along with a letter which reminds
each participant that Plan Units are being purchased for him as part of the Plan
unless he notifies the Trustee in writing by that Plan Reinvestment Date that he
no longer wishes to participate in the Plan. In the event a Primary Series has
not been declared effective in sufficient time to distribute a final Prospectus
relating thereto and there is no Secondary Series as to which a registration
statement is currently effective, it is the Sponsor's intention to suspend the
Plan and distribute to each participant his regular semi-annual or annual
distribution. If the Plan is so suspended, it will resume in effect with the
next Plan Reinvestment Date assuming units of an Available Series are then being
offered.

                  To aid a participant who might desire to withdraw either from
the Plan or from a particular distribution, the Trustee has established a toll
free number (see "Summary of Essential Information" in Part A) for participants
to use for notification of withdrawal, which must be confirmed in writing prior
to the Plan Reinvestment Date. Should the Trustee be so notified, it will make
the appropriate cash disbursement. Unless the withdrawing participant
specifically indicates in his written confirmation that (a) he wishes to
withdraw from the Plan for that particular distribution only, or (b) he wishes
to withdraw from the Plan for less than all units of each series of "Municipal
Securities Trust" or "Insured Municipal Securities Trust" which he might then
own (and specifically identifies which series are to continue in the Plan), he
will be deemed to have withdrawn completely from the Plan in all respects. Once
a participant withdraws completely, he will only be allowed to again participate
in the Plan by submitting a new Authorization Form. A sale or redemption of a
portion of a participant's Plan Units will not constitute a withdrawal from the
Plan with respect to the remaining Plan Units owned by such participant.

                  Unless a Certificateholder notifies the Trustee in writing to
the contrary, each semi-annual and annual Certificateholder who has acquired
Plan Units will be deemed to have elected the semi-annual and annual plan of
distribution, respectively, and to participate in the Plan with respect to
distributions made in connection with such Plan Units. (Should the Available
Series from which Plan Units are purchased for the account of an annual
Certificateholder fail to have an annual distribution plan, such
Certificateholder will be deemed to have elected the semi-annual plan of
distribution, and to participate in the Plan with respect to distributions made,
in connection with such Plan Units.) A participant who subsequently desires to
have distributions made with respect to Plan Units delivered to him in cash may
withdraw from the Plan with respect to such Plan Units and remain in the Plan
with respect to units acquired other than through the Plan. Assuming a
participant has his distributions made with respect to Plan Units reinvested,
all such distributions will be accumulated with distributions generated from the
Units of the Trust used to purchase such additional Plan Units. However,
distributions related to units in other series of "Municipal Securities Trust"
will not be accumulated with the foregoing distributions for Plan purchases.
Thus, if a person owns units in more than one series of "Municipal Securities

                                      -49-
112677.5 

<PAGE>



Trust" (which are not the result of purchases under the Plan), distributions
with respect thereto will not be aggregated for purchases under the Plan.

                  Although not obligated to do so, the Sponsor intends to
maintain a market for the Plan Units and continuously to offer to purchase Plan
Units at prices based upon the aggregate offering price of the Bonds in the
Available Series portfolio during the initial offering of the Available Series,
or at the aggregate bid price of the Bonds of the Available Series after its
initial offering has been completed. The Sponsor may discontinue such purchases
at any time. The aggregate bid price of the underlying bonds may be expected to
be less than the aggregate offering price. In the event that a market is not
maintained for Plan Units, a participant desiring to dispose of his Plan Units
may be able to do so only by tendering such Plan Units to the Trustee for
redemption at the Redemption Price of the full units in the Available Series
corresponding to such Plan Units, which is based upon the aggregate bid price of
the underlying bonds as described in the "Insured Municipal Securities Trust"
Prospectus for the Available Series in question. If a participant wishes to
dispose of his Plan Units, he should inquire of the Sponsor as to current market
prices prior to making a tender for redemption to the Trustee.

                  Any participant may tender his Plan Units for redemption to
the Available Series Trust. Participants may redeem Plan Units by making a
written request to the Trustee, at the address listed in the "Summary of
Essential Information" in Part A, on the Redemption Form supplied by the
Trustee. The redemption price per Plan Unit will be determined as set forth in
the "Insured Municipal Securities Trust" Prospectus of the Available Series from
which such Plan Unit was purchased following receipt of the request and adjusted
to reflect the fact that it relates to a Plan Unit. There is no charge for the
redemption of Plan Units.

                  The Trust Agreement requires that the Trustee notify the
Sponsor of any tender of Plan Units for redemption. So long as the Sponsor is
maintaining a bid in the secondary market, the Sponsor will purchase any Plan
Units tendered to the Trustee for redemption by making payment therefor to the
Certificateholder in an amount not less than the redemption price for such Plan
Units on the date of tender not later than the day on which such Plan Units
otherwise would have been redeemed by the Trustee.

                  Participants in the Plan will not receive individual
certificates for their Plan Units unless the amount of Plan Units accumulated
represents $1,000 principal amount of bonds underlying such Units and, in such
case, a written request for certificates is made to the Trustee. All Plan Units
will be accounted for by the Trustee on a book entry system. Each time Plan
Units are purchased under the Plan, a participant will receive a confirmation
stating his cost, number of Units purchased and estimated current return.
Questions regarding a participant's statements should be directed to the Trustee
by calling the Trustee at the number set forth under "Summary of Essential
Information" in Part A of this Prospectus.

                  All expenses relating to the operation of the Plan will be
borne by the Sponsor. The Sponsor and the Trustee reserve the right to suspend,
modify or terminate the Plan at any time for any reason, including the right to
suspend the Plan if the Sponsor is unable or unwilling to establish a Primary
Series or is unable to provide Secondary Series Units. All participants will
receive notice of any such suspension, modification or termination.

                  TOTAL REINVESTMENT PLAN FOR TEXAS RESIDENTS. Except as
specifically provided under this section, and unless the context otherwise
requires, all provisions and definitions contained under the heading "Total
Reinvestment Plan" shall be applicable to the Total Reinvestment Plan for Texas
Residents ("Texas Plan").

                                      -50-
112677.5 

<PAGE>




                  Semi-annual and annual Certificateholders of the Trust who are
residents of Texas have the option prior to any semi-annual or annual
distribution to affirmatively elect to reinvest that distribution, including
both interest and principal, if any, in an Available Series.

                  A resident of Texas who is a semi-annual or annual
Certificateholder may join the Texas Plan for any particular semi-annual or
annual distribution by delivering to the Trustee an Authorization Form For Texas
Residents ("Texas Authorization Form") specifically mentioning the date of the
particular semi-annual or annual distribution he wishes to reinvest. On or about
each semi-annual or annual Record Date, Texas Authorization Forms shall be sent
by the Trustee to every Certificateholder who, according to the Trustee's
records, is a resident of Texas. In the event that the Sponsor suspends the Plan
or the Texas Plan no Texas Authorization Forms shall be sent. In order that
distributions may be reinvested on a particular Plan Reinvestment Date, the
Texas Authorization Form must be received by the Trustee on or before such Date.
Texas Authorization Forms not received in time for the Plan Reinvestment Date
will be deemed void. A participant who delivers a Texas Authorization Form to
the Trustee may thereafter withdraw said authorization by notifying the Trustee
at its toll free telephone number prior to a Plan Reinvestment Date. Such
notification of withdrawal must be confirmed in writing prior to the Plan
Reinvestment Date. Under no circumstances shall a Texas Authorization Form be
provided or accepted by the Trustee which provides for the reinvestment of
distributions for more than one Plan Reinvestment Date.

                  On or about each semi-annual and annual Record Date, the
Sponsor will send a current Prospectus relating to the Available Series being
offered on the next Plan Reinvestment Date along with a letter incorporating a
Texas Authorization Form which specifies the funds available for reinvestment,
reminds each participant that no Plan Units will be purchased for him unless the
Texas Authorization Form is received by the Trustee on or before that particular
Plan Reinvestment Date, and states that the Texas Authorization Form is valid
only for that particular semi-annual or annual distribution. If the Available
Series should materially differ from the Trust, the participant will be provided
with a notice of the material change and a new Texas Authorization Form which
would have to be returned to the Trustee before the Certificateholder would
again be able to participate in the Plan.

                  Each semi-annual and annual Certificateholder who has acquired
Plan Units will be deemed to have elected the semi-annual and annual plan of
distribution, respectively, with respect to such Units, but such
Certificateholder will not be deemed to participate in the Plan for any
particular distribution unless and until he delivers to the Trustee a Texas
Authorization Form pertaining to those Plan Units. (Should the Available Series
from which Plan Units are purchased for the account of an annual
Certificateholder fail to have an annual distribution plan, such
Certificateholder will be deemed to have elected the semi-annual plan of
distribution, and to participate in the Plan with respect to distributions made
in connection with such Plan Units.)


                              TRUST ADMINISTRATION

                  PORTFOLIO SUPERVISION. Except for the purchase of Replacement
Bonds or as discussed herein, the acquisition of any Bonds for the Trust other
than Bonds initially deposited by the Sponsor is prohibited. Although it is the
Sponsor's and Trustee's intention not to dispose of Bonds insured pursuant to
the Bond Insurance in the event of default, nevertheless, the Sponsor may direct
the Trustee to dispose of Bonds upon (i) default in payment of principal or
interest on such Bonds, (ii) institution of certain legal proceedings with
respect to the issuers of such Bonds, (iii) default under other documents
adversely affecting debt service on such Bonds, (iv) default

                                      -51-
112677.5 

<PAGE>



in payment of principal or interest on other obligations of the same issuer or
guarantor, (v) with respect to revenue Bonds, decline in revenues and income of
any facility or project below the estimated levels calculated by proper
officials charged with the construction or operation of such facility or project
or (vi) decline in price or the occurrence of other market or credit factors
that in the opinion of the Sponsor would make the retention of such Bonds in the
Trust detrimental to the interests of the Certificateholders. If a default in
the payment of principal or interest on any of the Bonds occurs and if the
Sponsor fails to instruct the Trustee to sell or hold such Bonds, the Trust
Agreement provides that the Trustee may sell such Bonds. The Trustee shall not
be liable for any depreciation or loss by reason of any sale of bonds or by
reason of the failure of the Sponsor to give directions to the Trustee.

                  The Sponsor is authorized by the Trust Agreement to direct the
Trustee to accept or reject certain plans for the refunding or refinancing of
any of the Bonds. Any bonds received in exchange or substitution will be held by
the Trustee subject to the terms and conditions of the Agreement to the same
extent as the Bonds originally deposited. Within five days after such deposit,
notice of such exchange and deposit shall be given by the Trustee to each
Certificateholder registered on the books of the Trustee, including an
identification of the Bonds eliminated and the Bonds substituted therefor.

                  TRUST AGREEMENT, AMENDMENT AND TERMINATION. The Trust
Agreement may be amended by the Trustee, the Sponsor and the Evaluator without
the consent of any of the Certificateholders: (1) to cure any ambiguity or to
correct or supplement any provision which may be defective or inconsistent; (2)
to change any provision thereof as may be required by the Securities and
Exchange Commission or any successor governmental agency; or (3) to make such
other provisions in regard to matters arising thereunder as shall not adversely
affect the interests of the Certificateholders.

                  The Trust Agreement may also be amended in any respect, or
performance of any of the provisions thereof may be waived, with the consent of
the holders of Certificates evidencing 66-2/3% of the Units then outstanding for
the purpose of modifying the rights of Certificateholders; provided that no such
amendment or waiver shall reduce any Certificateholder's interest in the Trust
without his consent or reduce the percentage of Units required to consent to any
such amendment or waiver without the consent of the holders of all Certificates.
The Trust Agreement may not be amended, without the consent of the holders of
all Certificates then outstanding, to increase the number of Units issuable or
to permit the acquisition of any bonds in addition to or in substitution for
those initially deposited in the Trust, except in accordance with the provisions
of the Trust Agreement. The Trustee shall promptly notify Certificateholders, in
writing, of the substance of any such amendment.

                  The Trust Agreement provides that the Trust shall terminate
upon the maturity, redemption or other disposition, as the case may be, of the
last of the Bonds held in the Trust but in no event is it to continue beyond the
end of the calendar year preceding the fiftieth anniversary of the execution of
the Trust Agreement. If the value of the Trust shall be less than the minimum
amount set forth under "Summary of Essential Information" in Part A, the Trustee
may, in its discretion, and shall when so directed by the Sponsor, terminate the
Trust. The Trust may also be terminated at any time with the consent of the
holders of Certificates representing 100% of the Units then outstanding. In the
event of termination, written notice thereof will be sent by the Trustee to all
Certificateholders. Within a reasonable period after termination, the Trustee
must sell any Bond remaining in the Trust, and, after paying all expenses and
charges incurred by the Trust, distribute to each Certificateholder, upon
surrender for cancellation of his Certificate for Units, his pro rata share of
the Interest and Principal Accounts.

                                      -52-
112677.5 

<PAGE>




   
                  THE SPONSORS. The Sponsor, Reich & Tang Distributors L.P.
("Reich & Tang") is engaged in the brokerage business and is a member of the
National Association of Securities Dealers, Inc. Reich & Tang is also a
registered investment adviser. Reich & Tang maintains its principal business
offices at 600 Fifth Avenue, New York, New York 10020. Reich & Tang Asset
Management L.P. ("RTAM LP"), a registered investment adviser, having its
principal place of business at 399 Boylston Street, Boston, MA 02116, is the 99%
limited partner of the Sponsor. RTAM LP is 99.5% owned by New England Investment
Companies, LP ("NEIC LP") and Reich & Tang Asset Management, Inc., a wholly
owned subsidiary of NEIC LP, owns the remaining .5% interest of RTAM LP and is
its general partner. NEIC LP's general partner is New England Investment
Companies, Inc. ("NEIC"), a holding company offering a broad array of investment
styles across a wide range of asset categories through eleven subsidiaries,
divisions and affiliates offering a wide array of investment styles and products
to institutional clients. These affiliates in the aggregate are investment
advisers or managers to over 54 registered investment companies. Reich & Tang is
the successor sponsor for numerous series of unit investment trusts, including,
New York Municipal Trust, Series 1 (and Subsequent Series), Municipal Securities
Trust, Series 1 (and Subsequent Series), 1st Discount Series (and Subsequent
Series), Multi-State Series 1 (and Subsequent Series), Mortgage Securities
Trust, Series 1 (and Subsequent Series), Insured Municipal Securities Trust,
Series 1 (and Subsequent Series), 5th Discount Series (and Subsequent Series),
and Equity Securities Trust, Series 1, Signature Series, Gabelli Communications
Income Trust (and Subsequent Series).

                  On August 30, 1996, New England Mutual Life Insurance Company
("The New England") and Metropolitan Life Insurance Company ("MetLife") merged,
with MetLife being the continuing company. RTAM L.P. remains a wholly-owned
subsidiary of NEIC LP, but RTAM Inc. its sole general partner, is now an
indirect subsidiary of MetLife. Also, Metlife New England Holdings, Inc., a
wholly-owned subsidiary of MetLife, owns 55% of the outstanding limited
partnership interest of NEIC L.P., also indirectly owns a majority of the
outstanding limited partnership interest of NEIC LP.

                  MetLife is a mutual life insurance company with assets of
$142.2 billion at March 31, 1996. It is the second largest life insurance
company in the United States in terms of total assets. MetLife provides a wide
range of insurance and investment products and services to individuals and
groups and is the leader among United States life insurance companies in terms
of total life insurance in force, which exceeded $1.2 trillion at March 31, 1996
for MetLife and its insurance affiliates. MetLife and its affiliates provide
insurance or other financial services to approximately 36 million people
worldwide.
    

                  For certain other Trusts as set forth in the "Summary of
Essential Information" in Part A, the Sponsors are Reich & Tang and Gruntal &
Co., Incorporated, both of whom have entered into an Agreement Among Co-Sponsors
pursuant to which both parties have agreed to act as Co-Sponsors for the Trust.
Reich & Tang has been appointed by Gruntal & Co., Incorporated as agent for
purposes of taking any action required or permitted to be taken by the Sponsor
under the Trust Agreement. If the Sponsors are unable to agree with respect to
action to be taken jointly by them under the Trust Agreement and they cannot
agree as to which Sponsor shall act as sole Sponsor, then Reich & Tang shall act
as sole Sponsor. If one of the Sponsors fails to perform its duties under the
Trust Agreement or becomes incapable of acting or becomes bankrupt or its
affairs are taken over by public authorities, that Sponsor may be discharged
under the Trust Agreement and a new Sponsor may be appointed or the remaining
Sponsor may continue to act as Sponsor.

   
                   Gruntal & Co., L.L.C., a Delaware limited liability company,
operates a regional securities broker/dealer from its main office in New York
City and branch

                                      -53-
112677.5 

<PAGE>



offices in nine states. The firm is very active in the marketing of investment
companies and has signed dealer agreements with many mutual fund groups.
Further, through its Syndicate Department, Gruntal & Co., L.L.C. has
underwritten a large number of Closed-End Funds and has been Co-Manager on the
following offerings: Cigna High Income Shares; Dreyfus New York Municipal
Income, Inc.; Franklin Principal Maturity Trust and Van Kampen Merritt Limited
Term High Income Trust. The Sponsor is liable for the performance of its
obligations arising from its responsibilities under the Trust Agreement, but
will be under no liability to Certificateholders for taking any action, or
refraining from taking any action, in good faith pursuant to the Trust
Agreement, or for errors in judgment except in cases of its own willful
misfeasance, bad faith, gross negligence or reckless disregard of its
obligations and duties.
    

                  The Sponsor may resign at any time by delivering to the
Trustee an instrument of resignation executed by the Sponsor.

                  If at any time the Sponsor shall resign or fail to perform any
of its duties under the Trust Agreement or becomes incapable of acting or
becomes bankrupt or its affairs are taken over by public authorities, then the
Trustee may either (a) appoint a successor Sponsor; (b) terminate the Trust
Agreement and liquidate the Trust; or (c) continue to act as Trustee without
terminating the Trust Agreement. Any successor Sponsor appointed by the Trustee
shall be satisfactory to the Trustee and, at the time of appointment, shall have
a net worth of at least $1,000,000.

   
                  THE TRUSTEE. For certain of the Trusts, as set forth in the
"Summary of Essential Information" in Part A, the Trustee is The Chase Manhattan
Bank with its principal executive office located at 270 Park Avenue, New York,
New York 10017 (800) 428-8890 and its unit investment trust office at 4 New York
Plaza, New York, New York 10004. The Trustee is subject to supervision by the
Superintendent of Banks of the State of New York, the Federal Deposit Insurance
Corporation and the Board of Governors of the Federal Reserve System.

                  For certain other Trusts as set forth in the "Summary of
Essential Information" in Part A, the Trustee is The Bank of New York, a trust
company organized under the laws of New York, having its offices at 101 Barclay
Street, New York, New York 10286. The Bank of New York is subject to supervision
and examination by the Superintendent of Banks of the State of New York and the
Board of Governors of the Federal Reserve System, and its deposits are insured
by the Federal Deposit Insurance Corporation to the extent permitted by law. The
Trustee must be a banking corporation organized under the laws of the United
States or any state which is authorized under such laws to exercise corporate
trust powers and must have at all times an aggregate capital, surplus and
undivided profits of not less than $5,000,000. The duties of the Trustee are
primarily ministerial in nature. The Trustee did not participate in the
selection of Securities for the portfolio of the Trust.
    

                  The Trustee shall not be liable or responsible in any way for
taking any action, or for refraining from taking any action, in good faith
pursuant to the Trust Agreement, or for errors in judgment; or for any
disposition of any moneys, bonds or Certificates in accordance with the Trust
Agreement, except in cases of its own willful misfeasance, bad faith, gross
negligence or reckless disregard of its obligations and duties; provided,
however, that the Trustee shall not in any event be liable or responsible for
any evaluation made by the Evaluator. In addition, the Trustee shall not be
liable for any taxes or other governmental charges imposed upon or in respect of
the Bonds or the Trust which it may be required to pay under current or future
law of the United States or any other taxing authority having jurisdiction. The
Trustee shall not be liable for depreciation or loss

                                      -54-
112677.5 

<PAGE>



incurred by reason of the sale by the Trustee of any of the Bonds pursuant to
the Trust Agreement.

                  For further information relating to the responsibilities of
the Trustee under the Trust Agreement, reference is made to the material set
forth under "Rights of Certificateholders".

                  The Trustee may resign by executing an instrument in writing
and filing the same with the Sponsor, and mailing a copy of a notice of
resignation to all Certificateholders. In such an event the Sponsor is obligated
to appoint a successor Trustee as soon as possible. In addition, if the Trustee
becomes incapable of acting or becomes bankrupt or its affairs are taken over by
public authorities, the Sponsor may remove the Trustee and appoint a successor
as provided in the Trust Agreement. Notice of such removal and appointment shall
be mailed to each Certificateholder by the Sponsor. If upon resignation of the
Trustee no successor has been appointed and has accepted the appointment within
thirty days after notification, the retiring Trustee may apply to a court of
competent jurisdiction for the appointment of a successor. The resignation or
removal of the Trustee becomes effective only when the successor Trustee accepts
its appointment as such or when a court of competent jurisdiction appoints a
successor Trustee. Upon execution of a written acceptance of such appointment by
such successor Trustee, all the rights, powers, duties and obligations of the
original Trustee shall vest in the successor.

                  Any corporation into which the Trustee may be merged or with
which it may be consolidated, or any corporation resulting from any merger or
consolidation to which the Trustee shall be a party, shall be the successor
Trustee. The Trustee must always be a banking corporation organized under the
laws of the United States or any State and have at all times an aggregate
capital, surplus and undivided profits of not less than $2,500,000.

   
                  THE EVALUATOR. The Evaluator is Kenny S&P Evaluation Services,
a division of a business unit of J.J. Kenny Company, Inc., a subsidiary of The
McGraw-Hill Companies, with main offices located at 65 Broadway, New York, New
York 10006. The Evaluator is a wholly-owned subsidiary of McGraw Hill, Inc. The
Evaluator is a registered investment advisor and also provides financial
information services.
    

                  The Trustee, the Sponsor and the Certificateholders may rely
on any evaluation furnished by the Evaluator and shall have no responsibility
for the accuracy thereof. Determinations by the Evaluator under the Trust
Agreement shall be made in good faith upon the basis of the best information
available to it, provided, however, that the Evaluator shall be under no
liability to the Trustee, the Sponsor or Certificateholders for errors in
judgment, except in cases of its own willful misfeasance, bad faith, gross
negligence or reckless disregard of its obligations and duties.

                  The Evaluator may resign or may be removed by the Sponsor and
Trustee, and the Sponsor and the Trustee are to use their best efforts to
appoint a satisfactory successor. Such resignation or removal shall become
effective upon the acceptance of appointment by the successor Evaluator. If upon
resignation of the Evaluator no successor has accepted appointment within thirty
days after notice of resignation, the Evaluator may apply to a court of
competent jurisdiction for the appointment of a successor.


                           TRUST EXPENSES AND CHARGES


                  At no cost to the Trust, the Sponsor has borne the expenses of
creating and establishing the Trust, including the cost of initial preparation

                                      -55-
112677.5 

<PAGE>



and execution of the Trust Agreement, registration of the Trust and the Units
under the Investment Company Act of 1940 and the Securities Act of 1933, the
premiums on the Sponsor-Insured Bonds, initial preparation and printing of the
Certificates, legal expenses, advertising and selling expenses, expenses of the
Trustee including, but not limited to, an amount equal to interest accrued on
certain "when issued" bonds since the date of settlement for the Units, initial
fees and other out-of-pocket expenses. The fees of the Evaluator, however,
incurred during the initial public offering are paid directly by the Trust.

                   The Sponsor will not charge the Trust a fee for its services
as such. (See "Sponsor's Profits".)

                  The Sponsor will receive for portfolio supervisory services to
the Trust an Annual Fee in the amount set forth under "Summary of Essential
Information" in Part A of this Prospectus. The Sponsor's fee may exceed the
actual cost of providing portfolio supervisory services for this Trust, but at
no time will the total amount received for portfolio supervisory services
rendered to all series of the Municipal Securities Trust in any calendar year
exceed the aggregate cost to the Sponsor of supplying such services in such
year. (See "Portfolio Supervision".)

                  The Trustee will receive for its ordinary recurring services
to the Trust an annual fee in the amount set forth under "Summary of Essential
Information" in Part A of this Prospectus. For a discussion of the services
performed by the Trustee pursuant to its obligations under the Trust Agreement,
see "Trust Administration" and "Rights of Certificateholders".

                  The Evaluator will receive, for each daily evaluation of the
Bonds in the Trust after the initial public offering is completed, a fee in the
amount set forth under "Summary of Essential Information" in Part A of this
Prospectus.

                  The Trustee's and Evaluator's fees are payable monthly as of
the Record Date from the Interest Account to the extent funds are available and
then from the Principal Account. Both fees may be increased without approval of
the Certificateholders by amounts not exceeding proportionate increases in
consumer prices for services as measured by the United States Department of
Labor's Consumer Price Index entitled "All Services Less Rent".

                  The following additional charges are or may be incurred by the
Trust: all expenses (including counsel fees) of the Trustee incurred and
advances made in connection with its activities under the Trust Agreement,
including the expenses and costs of any action undertaken by the Trustee to
protect the Trust and the rights and interests of the Certificateholders; fees
of the Trustee for any extraordinary services performed under the Trust
Agreement; indemnification of the Trustee for any loss or liability accruing to
it without gross negligence, bad faith or willful misconduct on its part,
arising out of or in connection with its acceptance or administration of the
Trust; indemnification of the Sponsor for any losses, liabilities and expenses
incurred in acting as Sponsor of the Trust without gross negligence, bad faith
or willful misconduct on its part; and all taxes and other governmental charges
imposed upon the Bonds or any part of the Trust (no such taxes or charges are
being levied, made or, to the knowledge of the Sponsor, contemplated). The above
expenses, including the Trustee's fees, when paid by or owing to the Trustee are
secured by a first lien on the Trust. In addition, the Trustee is empowered to
sell Bonds in order to make funds available to pay all expenses.

                  The accounts of the Trust shall be audited not less than
annually by independent public accountants selected by the Sponsor. So long as
the Sponsor maintains a secondary market, the Sponsor will bear any audit
expense

                                      -56-
112677.5 

<PAGE>



which exceeds 50 cents per Unit. Certificateholders covered by the audit during
the year may receive a copy of the audited financials upon request.

   
                  Unless the Sponsor otherwise directs, the accounts of the
Trust shall be audited not less than annually by independent public accountants
selected by the Sponsor. The expenses of the audit shall be an expense of the
Trust. So long as the Sponsor maintains a secondary market, the Sponsor will
bear any audit expense which exceeds $.50 per 1,000 Units. Certificateholders
covered by the audit during the year may receive a copy of the audited
financials upon request.

                     EXCHANGE PRIVILEGE AND CONVERSION OFFER

                  EXCHANGE PRIVILEGE. Certificateholders will be able to elect
to exchange any or all of their Units of this Trust for Units of one or more of
any available series of Equity Securities Trust Insured Municipal Securities
Trust, Municipal Securities Trust, New York Municipal Trust or Mortgage
Securities Trust (the "Exchange Trusts") at a reduced sales charge as set forth
below. Under the Exchange Privilege, the Sponsor's repurchase price during the
initial offering period of the Units being surrendered will be based on the
market value of the Securities in the Trust portfolio or on the aggregate offer
price of the Bonds in the other Trust Portfolios; and, after the initial
offering period has been completed, will be based on the aggregate bid price of
the Bonds in the particular Trust portfolio. Units in an Exchange Trust then
will be sold to the Certificateholder at a price based on the aggregate offer
price of the Bonds in the Exchange Trust portfolio (or for Units of Equity
Securities Trust, based on the market value of the underlying securities in the
Trust portfolio) during the initial public offering period of the Exchange
Trust; and after the initial public offering period has been completed, based on
the aggregate bid price of the Bonds in the Exchange Trust portfolio if its
initial offering has been completed plus accrued interest (or for Units of
Equity Securities Trust, based on the market value of the underlying securities
in the Trust portfolio) and a reduced sales charge as set forth below.

                  Except for Certificateholders who wish to exercise the
Exchange Privilege within the first five months of their purchase of Units of
the Trust, any purchaser who purchases Units under the Exchange Privilege will
pay a lower sales charge than that which would be paid for the Units by a new
investor. For Certificateholders who wish to exercise the Exchange Privilege
within the first five months of their purchase of Units of the Trust, the sales
charge applicable to the purchase of units of an Exchange Trust shall be the
greater of (i) the reduced sales charge or (ii) an amount which when coupled
with the sales charge paid by the Certificateholder upon his original purchase
of Units of the Trust would equal the sales charge applicable in the direct
purchase of units of an Exchange Trust.
    

                  DESCRIPTION OF THE EXCHANGE TRUSTS AND THE CONVERSION TRUSTS.
Municipal Securities Trust and New York Municipal Trust may be appropriate
investment vehicles for an investor who is more interested in tax-exempt income.
The interest income from New York Municipal Trust is, in general, also exempt
from New York State and local New York income taxes, while the interest income
from Municipal Securities Trust is subject to applicable New York State and
local New York taxes, except for that portion of the income which is
attributable to New York obligations in the Trust portfolio, if any. The
interest income from each State Trust of the Municipal Securities Trust,
Multi-State Series is, in general, exempt from state and local taxes when held
by residents of the state where the issuers of bonds in such State Trusts are
located. The Insured Municipal Securities Trust combines the advantages of
providing interest income free from regular federal income tax under existing
law with the added safety of irrevocable insurance. Insured Navigator Series
further combines the advantages of providing interest income free from regular

                                      -57-
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<PAGE>



federal income tax and state and local taxes when held by residents of the state
where issuers of bonds in such State Trusts are located with the added safety of
irrevocable insurance. Mortgage Securities Trust offers an investment vehicle
for investors who are interested in obtaining safety of capital and a high level
of current distribution of interest income through investment in a fixed
portfolio of collateralized mortgage obligations. Equity Securities Trust offers
investors an opportunity to achieve capital appreciation together with a high
level of current income.

                  TAX CONSEQUENCES OF THE EXCHANGE PRIVILEGE AND THE CONVERSION
OFFER. A surrender of units pursuant to the Exchange Privilege or the Conversion
Offer will constitute a "taxable event" to the Certificateholder under the Code.
The Certificateholder will realize a tax gain or loss that will be of a long- or
short-term capital or ordinary income nature depending on the length of time the
units have been held and other factors. A Certificateholder's tax basis in the
Units acquired pursuant to the Exchange Privilege or Conversion Offer will be
equal to the purchase price of such Units. Investors should consult their own
tax advisors as to the tax consequences to them of exchanging or redeeming units
and participating in the Exchange Privilege or Conversion Offer.


                                  OTHER MATTERS

   
                  LEGAL OPINIONS. The legality of the Units offered hereby and
certain matters relating to federal tax law have been passed upon by Battle
Fowler LLP, 75 East 55th Street, New York, New York 10022, as counsel for the
Sponsor. Carter, Ledyard & Milburn, Two Wall Street, New York, New York 10005
have acted as counsel for The Chase Manhattan Bank. Booth & Baron, 122 East 42nd
Street, New York, New York 10168, have acted as counsel for the Bank of New
York. Certain matters relating to New Jersey tax law have been passed upon by
Freeman, Zeller & Bryant, as special New Jersey counsel to the Sponsor.

                  INDEPENDENT ACCOUNTANTS. The financial statements of the
Trusts for the year ended December 31, 1996 included in Part A of this
Prospectus have been examined by Price Waterhouse LLP, independent accountants.
The financial statements have been so included in reliance on their report given
upon the authority of said firm as experts in accounting and auditing. KPMG Peat
Marwick LLP has consented to the incorporation by reference of their report on
the statements of operations and changes in net assets for the Trusts included
in Part A of this Prospectus for the periods ended December 31, 1994 and
December 31, 1995, respectively.
    



                          DESCRIPTION OF BOND RATINGS*

                  STANDARD & POOR'S RATINGS SERVICES. A brief description of the
applicable Standard & Poor's rating symbols and their meanings is as follows:

                  A Standard & Poor's corporate or municipal bond rating is a
current assessment of the creditworthiness of an obligor with respect to a
specific debt obligation. This assessment of creditworthiness may take into
consideration obligors such as guarantors, insurers, or lessees.

                  The bond rating is not a recommendation to purchase or sell a
security, inasmuch as it does not comment as to market price.
- --------
*        As described by Standard & Poor's.


                                      -58-
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<PAGE>




                  The ratings are based on current information furnished to
Standard & Poor's by the issuer and obtained by Standard & Poor's from other
sources it considers reliable. The ratings may be changed, suspended or
withdrawn as a result of changes in, or unavailability of, such information.

                  The ratings are based, in varying degrees, on the following
considerations:

          I.   Likelihood of default-capacity and willingness of the obligor
as to the timely payment of interest and repayment of principal in
accordance with the terms of the obligation.

         II.   Nature of and provisions of the obligation.

        III. Protection afforded by, and relative position of, the obligation in
the event of bankruptcy, reorganization or other arrangement under the laws of
bankruptcy and other laws affecting creditors' rights.

                  AAA -- This is the highest rating assigned by Standard &
Poor's to a debt obligation and indicates an extremely strong capacity to pay
principal and interest.

                  AA -- Bonds rated AA also qualify as high-quality debt
obligations. Capacity to pay principal and interest is very strong, and they
differ from AAA issues only in small degrees.

                  A -- Bonds rated A have a strong capacity to pay principal and
interest, although they are somewhat more susceptible to the adverse effects of
changes in circumstances and economic conditions.

                  BBB -- Bonds rated BBB are regarded as having an adequate
capacity to pay principal and interest. Whereas they normally exhibit adequate
protection parameters, adverse economic conditions or changing circumstances are
more likely to lead to a weakened capacity to pay principal and interest for
bonds in this category than for bonds in the A category.

                  Plus (+) or Minus (-): To provide more detailed indications of
credit quality, the ratings from "AA" to "BB" may be modified by the addition of
a plus or minus sign to show relative standing within the major rating
categories.

                  Provisional Ratings (Prov.) following a rating indicates the
rating is provisional, which assumes the successful completion of the project
being financed by the issuance of the bonds being rated and indicates that
payment of debt service requirements is largely or entirely dependent upon the
successful and timely completion of the project. This rating, however, while
addressing credit quality subsequent to completion, makes no comment on the
likelihood of, or the risk of default upon failure of, such completion.
Accordingly, the investor should exercise his own judgment with respect to such
likelihood and risk.

                       DESCRIPTION OF RATING ON THE UNITS*

                  A Standard & Poor's rating on the units of an investment trust
(hereinafter referred to collectively as "units" and "fund") is a current
assessment of creditworthiness with respect to the investments held by such
fund. This assessment takes into consideration the financial capacity of the
issuers and of any guarantors, insurers, lessees, or mortgagors with respect


- --------
*        As described by Standard & Poor's Corporation.

                                      -59-
112677.5 

<PAGE>



to such investments. The assessment, however, does not take into account the
extent to which fund expenses or portfolio asset sales for less than the fund's
purchase price will reduce payment to the unit holder of the interest and
principal required to be paid on the portfolio assets. In addition, the rating
is not a recommendation to purchase, sell, or hold units, inasmuch as the rating
does not comment as to market price of the units or suitability for a particular
investor.

                  Funds rated "AAA" are composed exclusively of assets that are
rated "AAA" by Standard & Poor's or have, in the opinion of Standard & Poor's,
credit characteristics comparable to assets that are rated "AAA", or certain
short-term investments. Standard & Poor's defines its AAA rating for such assets
as the highest rating assigned by Standard & Poor's to a debt obligation.
Capacity to pay interest and repay principal is very strong.

                                      -60-
112677.5 

<PAGE>




                 FOR USE WITH INSURED MUNICIPAL SECURITIES TRUST
                           9TH - 50TH DISCOUNT SERIES
                                  SERIES 3 - 32
                    NEW YORK NAVIGATOR INSURED SERIES 1 - 17
                   NEW JERSEY NAVIGATOR INSURED SERIES 1 - 13

=============================================================================

       AUTHORIZATION FOR INVESTMENT IN INSURED MUNICIPAL SECURITIES TRUST
                          -- DISCOUNT SERIES/SERIES --
                       TRP PLAN - TOTAL REINVESTMENT PLAN


I hereby elect to participate in the TRP Plan and am the owner of _____ units
___ Discount Series/Series _______.

I hereby authorize The Chase Manhattan Bank, Trustee, to pay all semi-annual or
annual distributions of interest and principal (if any) with respect to such
units to The Chase Manhattan Bank, as TRP Plan Agent, who shall immediately
invest the distributions in units of the available series of Insured Municipal
Securities Trust above or, if unavailable, of other available series of
Municipal Securities Trust.


The foregoing authorization is subject in              Date ______________, 19__
all respects to the terms and conditions of
participation set forth in the prospectus
relating to such available series.


- -------------------------------------------  --------------------------------
Registered Holder (Print)                    Registered Holder (Print)


- -------------------------------------------  --------------------------------
Registered Holder Signature                  Registered Holder Signature
                                             (Two signatures if joint tenancy)


My Brokerage Firm's Name ____________________________________________________

Street Address ______________________________________________________________

City, State and Zip Code ____________________________________________________

Salesman's Name ___________________________  Salesman's No. _________________


                 UNIT HOLDERS NEED ONLY SIGN AND DATE THIS FORM.

==============================================================================

   
                               MAIL TO YOUR BROKER
                                       OR
                            THE CHASE MANHATTAN BANK
                  ATTN: THE UNIT INVESTMENT DEPARTMENT, UNIT A
                                4 NEW YORK PLAZA
                            NEW YORK, NEW YORK 10004
    

112677.5 

<PAGE>



                 FOR USE WITH INSURED MUNICIPAL SECURITIES TRUST
                       SERIES 1 - 4 (MULTIPLIER PORTFOLIO)
                   SERIES 1 - 2 AND 1ST - 8TH DISCOUNT SERIES


==============================================================================


           AUTHORIZATION FOR INVESTMENT IN MUNICIPAL SECURITIES TRUST
                          -- DISCOUNT SERIES/SERIES --
                       TRP PLAN - TOTAL REINVESTMENT PLAN


I hereby elect to participate in the TRP Plan and am the owner of _____ units
___ Discount Series/Series __________.

I hereby authorize The Bank of New York, Trustee to pay all semi-annual or
annual distributions of interest and principal (if any) with respect to such
units to The Bank of New York, as TRP Plan Agent, who shall immediately invest
the distributions in units of the available series of Insured Municipal
Securities Trust above or, if unavailable, of other available series of
Municipal Securities Trust.


The foregoing authorization is subject in             Date ______________, 19__
all respects to the terms and conditions of
participation set forth in the prospectus
relating to such available series.


- -------------------------------------------  --------------------------------
Registered Holder (Print)                    Registered Holder (Print)


- -------------------------------------------  --------------------------------
Registered Holder Signature                  Registered Holder Signature
                                             (Two signatures if joint tenancy)


My Brokerage Firm's Name ____________________________________________________

Street Address ______________________________________________________________

City, State and Zip Code ____________________________________________________

Salesman's Name ___________________________  Salesman's No. _________________


                 UNIT HOLDERS NEED ONLY SIGN AND DATE THIS FORM.


==============================================================================


                               MAIL TO YOUR BROKER
                                       OR
                              THE BANK OF NEW YORK
                      ATTN: UNIT INVESTMENT TRUST DIVISION
                               101 BARCLAY STREET
                            NEW YORK, NEW YORK 10286


112677.5 

<PAGE>



<TABLE>

                                INDEX                                                        INSURED
                                -----
<CAPTION>
<S>                                                              <C>
   
                                                                                   MUNICIPAL SECURITIES TRUST
Title                                                            Page                (Unit Investment Trust)
- -----                                                            ----
                                                                                           Prospectus
Summary of Essential Information..................................A-5
Financial and Statistical Information.............................A-6                Dated:  April 30, 1997
Information Regarding the Trust...................................A-7
Audit and Financial Information...................................F-1                       Sponsor:
The Trust...........................................................1              Reich & Tang Distributors L.P.
Risk Considerations................................................15                    600 Fifth Avenue
Public Offering....................................................35                New York, New York  10020
Estimated Long Term Return and                                                          (212) 830-5200
  Estimated Current Return........................................ 37             
Rights of Certificateholders...................................... 38             
Tax Status........................................................ 40                (and for certain Trusts:)
Liquidity......................................................... 45                 Gruntal & Co., L.L.C.
Total Reinvestment Plan........................................... 47                    14 Wall Street
Trust Administration.............................................. 51               New York, New York  10005
Trust Expenses and Charges........................................ 55                     212-267-8800
Exchange Privilege and Conversion                                     
  Offer............................................................57                       Trustee:
Other Matters..................................................... 58 
Description of Bond Ratings....................................... 58               The Chase Manhattan Bank
Description of Rating on the Units................................ 59                   4 New York Plaza
                                                                                      New York, New York  10004
                                                                                          800-882-9898

                                                                                                or

                                                                                        The Bank of New York
                                                                                       101 Barclay Street
Parts A and B of this Prospectus do not                                             New York, New York 10286
contain all of the information set forth in                                               800-431-8002
the registration statement and exhibits
relating thereto, filed with the Securities                                                Evaluator:
and Exchange Commission, Washington, D.C.,
under the Securities Act of 1933, and to                                                    Kenny S&P
which reference is made.                                                               Evaluation Services
                                                                                           65 Broadway
                              *   *   *                                             New York, New York  10006
    
</TABLE>


                  This Prospectus does not constitute an offer to sell, or a
solicitation of an offer to buy, securities in any state to any person to whom
it is not lawful to make such offer in such state.

                                                     *   *   *

                  No person is authorized to give any information or to make any
representations not contained in Parts A and B of this Prospectus; and any
information or representation not contained herein must not be relied upon as
having been authorized by the Trust, the Trustee, the Evaluator, or the Sponsor.
The Trust is registered as a unit investment trust under the Investment Company
Act of 1940. Such registration does not imply that the Trust or any of its Units
have been guaranteed, sponsored, recommended or approved by the United States or
any state or any agency or officer thereof.

112677.5 





                                     PART II

                       ADDITIONAL INFORMATION NOT REQUIRED
                                  IN PROSPECTUS

                       CONTENTS OF REGISTRATION STATEMENT


This Post-Effective Amendment to the Registration Statement on Form S-6
comprises the following papers and documents:

   
The facing sheet on Form S-6.
The Cross-Reference Sheet (incorporated by reference to the Post-Effective
  Amendments to Form S-6 Registration Statement Nos. 33-28384 and 33-37849,
  filed on April 25, 1996, respectively).
The Prospectus consisting of     pages.
Signatures.
Consent of Independent Accountants.
Consent of Counsel (included in Exhibit 99.3.1).
Consent of the Evaluator (included in Exhibit 99.5.1).
    

The following exhibits:

   
99.1.1        --   Form of Reference Trust Agreement (filed as Exhibit 99.1.1 to
                   Post-Effective Amendment No. 8 to Form S-6 Registration
                   Statement No. 33-26426 on April 25, 1997 and incorporated
                   herein by reference).

**99.1.1(a)   --   Amended Reference Trust Agreement, dated May 1, 1991, of
                   Insured Municipal Securities Trust, New York Navigator
                   Insured Series 2, including certain Amendments to Trust
                   Indenture and Agreement referred to under Exhibit 1.1.1 below
                   (filed as Exhibit 99.1.1(a) to Post-Effective Amendment No. 7
                   to Form S-6 Registration Statement No. 33-31426 of Insured
                   Municipal Securities Trust, New York Navigator Insured Series
                   2 on April 25, 1997 and incorporated herein by reference).

**99.1.1 (c)  --   Amended Reference Trust Agreement, dated May 1, 1991, of
                   Insured Municipal Securities Trust, New York Navigator
                   Insured Series 3, including certain Amendments to Trust
                   Indenture and Agreement referred to under Exhibit 1.1.1 below
                   (filed as Exhibit 99.1.1(c) to Post-Effective Amendment No. 7
                   to Form S-6 Registration Statement No. 33-34944 of Insured
                   Municipal Securities Trust, New York Navigator Series 3 on
                   April 25, 1997 and incorporated herein by reference).

99.1.1.1      --   Trust Indenture and Agreement for Insured Municipal
                   Securities Trust, 47th Discount Series and Series 20 (and
                   Subsequent Series) (filed as Exhibit 99.1.1.1 to the
                   Post-Effective Amendment to Form S-6 Registration Statement
                   No. 33-28384, filed on April 25, 1996 and incorporated herein
                   by reference).
    

99.1.3.4      --   Certificate of Formation and Agreement among Limited
                   Partners, as amended, of Reich & Tang Distributors L.P.
                   (filed as Exhibit 99.1.3.4 to Post-Effective Amendment No. 10
                   to Form S-6 Registration Statements Nos. 2-98914, 33-00376,
                   33-00856 and 33-01869 of Municipal Securities Trust, Series
                   28, 39th Discount Series, Series 29 & 40th Discount Series
                   and Series

   
- --------
*    Filed herewith for the EDGAR filing only.
    

                                      II-1
786.1

<PAGE>



                   30 & 41st Discount Series, respectively, on October 31, 1995
                   and incorporated herein by reference).

   
*99.1.3.6     --   Certificate of Formation of Gruntal & Co., L.L.C. (filed as
                   Exhibit 99.1.3.6 to the Post-Effective Amendment to Form S-6
                   Registration Statement No. 33-31426 on April 25, 1997 and
                   incorporated herein by reference).
    

99.1.5        --   Form of Insurance Policy of Financial Guaranty Insurance
                   Company for Sponsor-Insured Bonds (filed as Exhibit 99.1.5 to
                   Post-Effective Amendment No. 7 to Form S-6 Registration
                   Statement No. 33-26426 of Insured Municipal Securities Trust,
                   Series 15 on April 25, 1996 and incorporated herein by
                   reference).

99.1.5.1      --   Form of Insurance Policy of Bond Investors Guaranty for
                   Sponsor-Insured Bonds (filed as Exhibit 99.1.5.1 to Post-
                   Effective Amendment No. 7 to Form S-6 Registration Statement
                   No. 33-26426 of Insured Municipal Securities Trust, Series 15
                   on April 25, 1996 and incorporated herein by reference).

99.1.5.2      --   Form of Insurance Policy of Municipal Bond Investors
                   Assurance Corporation (filed as Exhibit 99.1.5.2 to
                   Post-Effective Amendment No. 7 to Form S-6 Registration
                   Statement No. 33-26426 of Insured Municipal Securities Trust,
                   Series 15 on April 25, 1996 and incorporated herein by
                   reference).

   
99.2.1        --   Form of Certificate dated June 16, 1989 (filed as Exhibit
                   99.2.1 to Post-Effective Amendment No. 7 to Registration
                   Statement Nos. 33-29313 and 33-30144 of Municipal Securities
                   Trust, Series 45 and Series 46 on October 25, 1996 and
                   incorporated herein by reference).

99.3.1        --   Form of Opinion of Battle Fowler LLP as to the legality of
                   the securities being registered, including their consent to
                   the delivery thereof and to the use of their name under the
                   headings "Tax Status" and "Legal Opinions" in the Prospectus
                   (filed as Exhibit 99.3.1 to Post-Effective Amendment No. 8 to
                   Form S-6 Registration Statement No. 33-26426 on April 25,
                   1997 and incorporated herein by reference).

**99.3.2      --   Form of Opinion of Freeman, Zeller & Bryant, Special New
                   Jersey Counsel (filed as Exhibit 99.3.2 to Post-Effective
                   Amendment No. 7 to Form S-6 Registration Statement No.
                   33-31426 on April 25, 1997 and incorporated herein by
                   reference).

**99.4.1      --   Form of Custody Agreement, dated January 18, 1990 (filed as
                   Exhibit 99.4.1 to Post-Effective Amendment No. 7 to Form S-6
                   Registration Statement No. 33-31426 on April 25, 1997 and
                   incorporated herein by reference).

**99.4.2      --   Form of First Amendment to Custody Agreement, dated July 20,
                   1990 (filed as Exhibit 99.4.2 to Post-Effective Amendment No.
                   7 to Form S-6 Registration Statement No. 33-31426 on April
                   25, 1997 and incorporated herein by reference).
    

- --------
*    Being filed by this Amendment.

**   Filed herewith for EDGAR filing only.

                                      II-2
786.1

<PAGE>




   
*99.5.1       --   Consent of the Evaluator.
    

99.6.0        --   Power of Attorney of Reich & Tang Distributors L.P., the
                   Depositor, by its officers and a majority of its Directors
                   (filed as Exhibit 99.6.0 to Amendment No. 1 to Form S-6
                   Registration Statement No. 33-62627 of Equity Securities
                   Trust, Series 6, Signature Series, Gabelli Entertainment and
                   Media Trust on November 16, 1995 and incorporated herein by
                   reference).

   
*99.6.1       --   Power of Attorney of Gruntal & Co., L.L.C., by its officers
                   and a majority of its Directors of the Executive Committee.

99.7.0        --   Form of Agreement Among Co-Sponsors (filed as Exhibit 99.7.0
                   to the Post-Effective Amendment to Form S-6 Registration
                   Statement No. 33-28384, filed on April 25, 1996 and
                   incorporated herein by reference).
    

*27           --   Financial Data Schedule(s) (for EDGAR filing only).

- --------
*    Being filed by this Amendment.

                                      II-3
786.1

<PAGE>


                                   SIGNATURES

   
          Pursuant to the requirements of the Securities Act of 1933, the
registrants, Insured Municipal Securities Trust, Series 23 & New York Navigator
Insured Series 2, New York Navigator Insured Series 3, and New York Navigator
Insured Series 6 & New Jersey Navigator Insured Series 3 certify that they have
met all of the requirements for effectiveness of this Post-Effective Amendment
to the Registration Statements pursuant to Rule 485(b) under the Securities Act
of 1933. The registrants have duly caused this Post-Effective Amendment to the
Registration Statements to be signed on their behalf by the undersigned,
thereunto duly authorized, in the City of New York and State of New York on the
17th day of April, 1997.

          INSURED MUNICIPAL SECURITIES TRUST, SERIES 23 & NEW YORK NAVIGATOR
          INSURED SERIES 2, NEW YORK NAVIGATOR INSURED SERIES 3, AND NEW YORK
          NAVIGATOR INSURED SERIES 6 & NEW JERSEY NAVIGATOR INSURED SERIES 3
          (Registrants)
    

          REICH & TANG DISTRIBUTORS L.P. 
               (Depositor)

          By:  Reich & Tang Asset Management, Inc., 
               as general partner


          By:      /s/PETER J. DEMARCO
                   -----------------------
                   Peter J. DeMarco
                   (Authorized Signatory)

          Pursuant to the requirements of the Securities Act of 1933, this
Post-Effective Amendment to the Registration Statement has been signed below by
the following persons who constitute the principal officers and a majority of
the directors of Reich & Tang Asset Management, Inc., the general partner of
Reich & Tang Distributors L.P., the Depositor, in the capacities and on the
dates indicated.
<TABLE>
<CAPTION>

Name                 Title                                Date

<S>                  <C>                                  <C>
   
PETER S. VOSS        President, Chief Executive Officer   )
                     and Director                         )
G. NEAL RYLAND       Executive Vice President, Treasurer  )  April 17, 1997
                     and Chief Financial Officer          )
EDWARD N. WADSWORTH  Clerk                                )
RICHARD E. SMITH III Director                             )By: /s/PETER J. DEMARCO
                                                          )    -------------------
STEVEN W. DUFF       Director                             )    Peter J. DeMarco
BERNADETTE N. FINN   Vice President                       )    Attorney-in-Fact*
LORRAINE C. HYSLER   Secretary                            )
RICHARD DE SANCTIS   Vice President and Treasurer         )
</TABLE>
    

- ---------------

*    Executed copies of Powers of Attorney were filed as Exhibit 6.0 to
     Amendment No. 1 to Registration Statement No. 33-62627 on November 16,
     1995.

                                      II-4
786.1

<PAGE>



                                   SIGNATURES

   
          Pursuant to the requirements of the Securities Act of 1933, the
registrants, Insured Municipal Securities Trust, Series 23 & New York Navigator
Insured Series 2, New York Navigator Insured Series 3, and New York Navigator
Insured Series 6 & New Jersey Navigator Insured Series 3 certify that they have
met all of the requirements for effectiveness of this Post-Effective Amendment
to the Registration Statements pursuant to Rule 485(b) under the Securities Act
of 1933. The registrants have duly caused this Post-Effective Amendment to the
Registration Statements to be signed on their behalf by the undersigned,
thereunto duly authorized, in the City of New York and State of New York on the
24th day of April, 1997.

          INSURED MUNICIPAL SECURITIES TRUST, SERIES 23 & NEW YORK NAVIGATOR
          INSURED SERIES 2, NEW YORK NAVIGATOR INSURED SERIES 3, AND NEW YORK
          NAVIGATOR INSURED SERIES 6 & NEW JERSEY NAVIGATOR INSURED SERIES 3
          (Registrants)

          GRUNTAL & CO., L.L.C. 
               (Depositor)


          By:      /s/LEE FENSTERSTOCK
                   ----------------------
                   Lee Fensterstock
                   (Authorized Signatory)

          Pursuant to the requirements of the Securities Act of 1933, this
Post-Effective Amendment to the Registration Statement has been signed below by
the following persons, who constitute the principal officers and a majority of
the directors of the Executive Committee of Gruntal & Co., L.L.C., the
Depositor, in the capacities and on the dates indicated.
    


Name                   Title                         Date

   
ROBERT P. RITTEREISER  Chief Executive Officer       )
                       and Chairman of the Board of  ) April 24, 1997
                       Directors                     )
LEE FENSTERSTOCK       President and Director        )

JOANNE T. MARREN       Executive Vice President,     ) By: /s/LEE FENSTERSTOCK
                                                     )     -------------------
                       General Counsel, Secretary    )     Lee Fensterstock
                       and Director                  )     Attorney-in-Fact*
BARRY RICHTER          Vice Chairman and Director    )
STEPHEN DITURSI        Executive Vice President and  )
                       Director                      )
HENRY D. GOTTMANN      Executive Vice President and  )
                       Director                      )
LEOPOLD KORINS         Director                      )
JOSEPH V. BATTIPAGLIA  Executive Vice President and  )
                       Director                      )
JOHN FEENEY            Director and President of GMS )
JOHN CIRRITO           Director and Executive        )
                          Vice President             )
RALPH H. BRADLEY, JR.  Executive Vice President and  )
                       Director                      )
    

- ---------------

*    Being filed by this Amendment.

                                      II-5
786.1

<PAGE>



                       CONSENT OF INDEPENDENT ACCOUNTANTS


We hereby consent to the use in the Prospectus constituting part of this
Post-Effective Amendment to the registration statement on Form S-6 of our report
dated March 28, 1997, relating to the financial statements and financial
highlights for the year ended December 31, 1996 of the Insured Municipal
Securities Trust, Series 23; Insured Municipal Securities Trust, New York
Navigator Insured Series 2; Insured Municipal Securities Trust, New York
Navigator Insured Series 3; Insured Municipal Securities Trust, New York
Navigator Insured Series 6; and Insured Municipal Securities Trust, New Jersey
Navigator Insured Series 3, which appear in such Prospectus. We also consent to
the reference to us under the heading "Independent Accountants" in the
Prospectus.



PRICE WATERHOUSE LLP

Boston, MA 02110
April 25, 1997

<PAGE>



                          Independent Auditors' Consent






Re:    Insured Municipal Securities Trust, Series 23
       Insured Municipal Securities Trust, New York Navigator Insured Series 2
       Insured Municipal Securities Trust, New York Navigator Insured Series 3
       Insured Municipal Securities Trust, New York Navigator Insured Series 6
       Insured Municipal Securities Trust, New Jersey Navigator Insured Series 3



         We consent to the incorporation by reference of our report dated March
31, 1996, on the statements of operations and changes in net assets for the
subject trusts for each of the years in the two year period ended December 31,
1995, and to the reference to our firm under the heading "Independent
Accountants" in the prospectus.




                                        KPMG Peat Marwick LLP


New York, New York
April 24, 1997

<TABLE> <S> <C>

<ARTICLE>                    6
<LEGEND>                     The schedule contains summary financial information
                             extracted from the financial statements and
                             supporting schedules as of the end of the most
                             current period and is qualified in its entirety by
                             reference to such financial statements.
</LEGEND>
<CIK>                        0000856292
<NAME>                       IMST-Series 23
<SERIES>
<NUMBER>                     1
<NAME>                       IMST-Series 23
       
<S>                          <C>
<FISCAL-YEAR-END>            Dec-31-1996
<PERIOD-START>               Jan-01-1996
<PERIOD-END>                 Dec-31-1996
<PERIOD-TYPE>                Year
<INVESTMENTS-AT-COST>        2,616,480
<INVESTMENTS-AT-VALUE>       2,917,869
<RECEIVABLES>                71,027
<ASSETS-OTHER>               0
<OTHER-ITEMS-ASSETS>         0
<TOTAL-ASSETS>               2,988,896
<PAYABLE-FOR-SECURITIES>     0
<SENIOR-LONG-TERM-DEBT>      0
<OTHER-ITEMS-LIABILITIES>    16,781
<TOTAL-LIABILITIES>          16,781
<SENIOR-EQUITY>              2,972,115
<PAID-IN-CAPITAL-COMMON>     0
<SHARES-COMMON-STOCK>        0
<SHARES-COMMON-PRIOR>        0
<ACCUMULATED-NII-CURRENT>    59,588
<OVERDISTRIBUTION-NII>       0
<ACCUMULATED-NET-GAINS>      3,312
<OVERDISTRIBUTION-GAINS>     0
<ACCUM-APPREC-OR-DEPREC>     301,389
<NET-ASSETS>                 2,972,115
<DIVIDEND-INCOME>            0
<INTEREST-INCOME>            235,416
<OTHER-INCOME>               0
<EXPENSES-NET>               9,132
<NET-INVESTMENT-INCOME>      226,284
<REALIZED-GAINS-CURRENT>     (13,476)
<APPREC-INCREASE-CURRENT>    (115,877)
<NET-CHANGE-FROM-OPS>        96,931
<EQUALIZATION>               0
<DISTRIBUTIONS-OF-INCOME>    252,811
<DISTRIBUTIONS-OF-GAINS>     1,330,965
<DISTRIBUTIONS-OTHER>        0
<NUMBER-OF-SHARES-SOLD>      0
<NUMBER-OF-SHARES-REDEEMED>  329
<SHARES-REINVESTED>          0
<NET-CHANGE-IN-ASSETS>       (1,486,845)
<ACCUMULATED-NII-PRIOR>      86,115
<ACCUMULATED-GAINS-PRIOR>    (12,549)
<OVERDISTRIB-NII-PRIOR>      0
<OVERDIST-NET-GAINS-PRIOR>   0
<GROSS-ADVISORY-FEES>        0
<INTEREST-EXPENSE>           0
<GROSS-EXPENSE>              0
<AVERAGE-NET-ASSETS>         0
<PER-SHARE-NAV-BEGIN>        979.99
<PER-SHARE-NII>              51.59
<PER-SHARE-GAIN-APPREC>      (22.72)
<PER-SHARE-DIVIDEND>         57.64
<PER-SHARE-DISTRIBUTIONS>    247.09
<RETURNS-OF-CAPITAL>         0
<PER-SHARE-NAV-END>          704.13
<EXPENSE-RATIO>              0
<AVG-DEBT-OUTSTANDING>       0
<AVG-DEBT-PER-SHARE>         0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                    6
<LEGEND>                     The schedule contains summary financial information
                             extracted from the financial statements and
                             supporting schedules as of the end of the most
                             current period and is qualified in its entirety by
                             reference to such financial statements.
</LEGEND>
<CIK>                        0000856292
<NAME>                       IMST-NYNAV2
<SERIES>
<NUMBER>                     2
<NAME>                       IMST-NYNAV2
       
<S>                          <C>
<FISCAL-YEAR-END>            Dec-31-1996
<PERIOD-START>               Jan-01-1996
<PERIOD-END>                 Dec-31-1996
<PERIOD-TYPE>                Year
<INVESTMENTS-AT-COST>        4,631,276
<INVESTMENTS-AT-VALUE>       5,161,503
<RECEIVABLES>                124,325
<ASSETS-OTHER>               0
<OTHER-ITEMS-ASSETS>         0
<TOTAL-ASSETS>               5,285,828
<PAYABLE-FOR-SECURITIES>     0
<SENIOR-LONG-TERM-DEBT>      0
<OTHER-ITEMS-LIABILITIES>    35,628
<TOTAL-LIABILITIES>          35,628
<SENIOR-EQUITY>              5,250,200
<PAID-IN-CAPITAL-COMMON>     0
<SHARES-COMMON-STOCK>        0
<SHARES-COMMON-PRIOR>        0
<ACCUMULATED-NII-CURRENT>    80,489
<OVERDISTRIBUTION-NII>       0
<ACCUMULATED-NET-GAINS>      8,208
<OVERDISTRIBUTION-GAINS>     0
<ACCUM-APPREC-OR-DEPREC>     530,227
<NET-ASSETS>                 5,250,200
<DIVIDEND-INCOME>            0
<INTEREST-INCOME>            381,111
<OTHER-INCOME>               0
<EXPENSES-NET>               10,198
<NET-INVESTMENT-INCOME>      370,913
<REALIZED-GAINS-CURRENT>     (3,652)
<APPREC-INCREASE-CURRENT>    (146,463)
<NET-CHANGE-FROM-OPS>        220,798
<EQUALIZATION>               0
<DISTRIBUTIONS-OF-INCOME>    383,681
<DISTRIBUTIONS-OF-GAINS>     762,938
<DISTRIBUTIONS-OTHER>        0
<NUMBER-OF-SHARES-SOLD>      0
<NUMBER-OF-SHARES-REDEEMED>  534
<SHARES-REINVESTED>          0
<NET-CHANGE-IN-ASSETS>       (925,821)
<ACCUMULATED-NII-PRIOR>      93,257
<ACCUMULATED-GAINS-PRIOR>    (56,260)
<OVERDISTRIB-NII-PRIOR>      0
<OVERDIST-NET-GAINS-PRIOR>   0
<GROSS-ADVISORY-FEES>        0
<INTEREST-EXPENSE>           0
<GROSS-EXPENSE>              0
<AVERAGE-NET-ASSETS>         0
<PER-SHARE-NAV-BEGIN>        1,095.23
<PER-SHARE-NII>              69.04
<PER-SHARE-GAIN-APPREC>      (26.80)
<PER-SHARE-DIVIDEND>         71.42
<PER-SHARE-DISTRIBUTIONS>    37.61
<RETURNS-OF-CAPITAL>         0
<PER-SHARE-NAV-END>          1,028.44
<EXPENSE-RATIO>              0
<AVG-DEBT-OUTSTANDING>       0
<AVG-DEBT-PER-SHARE>         0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                    6
<LEGEND>                     The schedule contains summary financial information
                             extracted from the financial statements and
                             supporting schedules as of the end of the most
                             current period and is qualified in its entirety by
                             reference to such financial statements.
</LEGEND>
<CIK>                        0000863533
<NAME>                       IMST-NYNAV3
<SERIES>
<NUMBER>                     1
<NAME>                       IMST-NYNAV3
       
<S>                          <C>
<FISCAL-YEAR-END>            Dec-31-1996
<PERIOD-START>               Jan-01-1996
<PERIOD-END>                 Dec-31-1996
<PERIOD-TYPE>                Year
<INVESTMENTS-AT-COST>        4,572,342
<INVESTMENTS-AT-VALUE>       5,066,847
<RECEIVABLES>                115,149
<ASSETS-OTHER>               0
<OTHER-ITEMS-ASSETS>         0
<TOTAL-ASSETS>               5,181,996
<PAYABLE-FOR-SECURITIES>     0
<SENIOR-LONG-TERM-DEBT>      0
<OTHER-ITEMS-LIABILITIES>    47,720
<TOTAL-LIABILITIES>          47,720
<SENIOR-EQUITY>              5,134,276
<PAID-IN-CAPITAL-COMMON>     0
<SHARES-COMMON-STOCK>        0
<SHARES-COMMON-PRIOR>        0
<ACCUMULATED-NII-CURRENT>    67,418
<OVERDISTRIBUTION-NII>       0
<ACCUMULATED-NET-GAINS>      11
<OVERDISTRIBUTION-GAINS>     0
<ACCUM-APPREC-OR-DEPREC>     494,505
<NET-ASSETS>                 5,134,276
<DIVIDEND-INCOME>            0
<INTEREST-INCOME>            372,906
<OTHER-INCOME>               0
<EXPENSES-NET>               9,910
<NET-INVESTMENT-INCOME>      362,996
<REALIZED-GAINS-CURRENT>     21,676
<APPREC-INCREASE-CURRENT>    (175,559)
<NET-CHANGE-FROM-OPS>        209,113
<EQUALIZATION>               0
<DISTRIBUTIONS-OF-INCOME>    374,218
<DISTRIBUTIONS-OF-GAINS>     782,602
<DISTRIBUTIONS-OTHER>        0
<NUMBER-OF-SHARES-SOLD>      0
<NUMBER-OF-SHARES-REDEEMED>  718
<SHARES-REINVESTED>          0
<NET-CHANGE-IN-ASSETS>       (947,707)
<ACCUMULATED-NII-PRIOR>      78,640
<ACCUMULATED-GAINS-PRIOR>    48,083
<OVERDISTRIB-NII-PRIOR>      0
<OVERDIST-NET-GAINS-PRIOR>   0
<GROSS-ADVISORY-FEES>        0
<INTEREST-EXPENSE>           0
<GROSS-EXPENSE>              0
<AVERAGE-NET-ASSETS>         0
<PER-SHARE-NAV-BEGIN>        1,116.78
<PER-SHARE-NII>              71.36
<PER-SHARE-GAIN-APPREC>      (26.91)
<PER-SHARE-DIVIDEND>         73.56
<PER-SHARE-DISTRIBUTIONS>    1.74
<RETURNS-OF-CAPITAL>         0
<PER-SHARE-NAV-END>          1,085.93
<EXPENSE-RATIO>              0
<AVG-DEBT-OUTSTANDING>       0
<AVG-DEBT-PER-SHARE>         0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                    6
<LEGEND>                     The schedule contains summary financial information
                             extracted from the financial statements and
                             supporting schedules as of the end of the most
                             current period and is qualified in its entirety by
                             reference to such financial statements.
</LEGEND>
<CIK>                        0000869774
<NAME>                       IMST-NYNAV6
<SERIES>
<NUMBER>                     1
<NAME>                       IMST-NYNAV6
       
<S>                          <C>
<FISCAL-YEAR-END>            Dec-31-1996
<PERIOD-START>               Jan-01-1996
<PERIOD-END>                 Dec-31-1996
<PERIOD-TYPE>                Year
<INVESTMENTS-AT-COST>        3,206,959
<INVESTMENTS-AT-VALUE>       3,485,925
<RECEIVABLES>                68,514
<ASSETS-OTHER>               0
<OTHER-ITEMS-ASSETS>         0
<TOTAL-ASSETS>               3,554,439
<PAYABLE-FOR-SECURITIES>     0
<SENIOR-LONG-TERM-DEBT>      0
<OTHER-ITEMS-LIABILITIES>    26,022
<TOTAL-LIABILITIES>          26,022
<SENIOR-EQUITY>              3,528,417
<PAID-IN-CAPITAL-COMMON>     0
<SHARES-COMMON-STOCK>        0
<SHARES-COMMON-PRIOR>        0
<ACCUMULATED-NII-CURRENT>    59,764
<OVERDISTRIBUTION-NII>       0
<ACCUMULATED-NET-GAINS>      (6,710)
<OVERDISTRIBUTION-GAINS>     0
<ACCUM-APPREC-OR-DEPREC>     278,966
<NET-ASSETS>                 3,528,417
<DIVIDEND-INCOME>            0
<INTEREST-INCOME>            239,466
<OTHER-INCOME>               0
<EXPENSES-NET>               8,224
<NET-INVESTMENT-INCOME>      231,242
<REALIZED-GAINS-CURRENT>     (468)
<APPREC-INCREASE-CURRENT>    (99,506)
<NET-CHANGE-FROM-OPS>        131,268
<EQUALIZATION>               0
<DISTRIBUTIONS-OF-INCOME>    232,607
<DISTRIBUTIONS-OF-GAINS>     121,992
<DISTRIBUTIONS-OTHER>        0
<NUMBER-OF-SHARES-SOLD>      0
<NUMBER-OF-SHARES-REDEEMED>  116
<SHARES-REINVESTED>          0
<NET-CHANGE-IN-ASSETS>       (223,331)
<ACCUMULATED-NII-PRIOR>      61,129
<ACCUMULATED-GAINS-PRIOR>    1,473
<OVERDISTRIB-NII-PRIOR>      0
<OVERDIST-NET-GAINS-PRIOR>   0
<GROSS-ADVISORY-FEES>        0
<INTEREST-EXPENSE>           0
<GROSS-EXPENSE>              0
<AVERAGE-NET-ASSETS>         0
<PER-SHARE-NAV-BEGIN>        1,089.67
<PER-SHARE-NII>              68.31
<PER-SHARE-GAIN-APPREC>      (28.72)
<PER-SHARE-DIVIDEND>         68.72
<PER-SHARE-DISTRIBUTIONS>    0
<RETURNS-OF-CAPITAL>         0
<PER-SHARE-NAV-END>          1,060.54
<EXPENSE-RATIO>              0
<AVG-DEBT-OUTSTANDING>       0
<AVG-DEBT-PER-SHARE>         0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                    6
<LEGEND>                     The schedule contains summary financial information
                             extracted from the financial statements and
                             supporting schedules as of the end of the most
                             current period and is qualified in its entirety by
                             reference to such financial statements.
</LEGEND>
<CIK>                        0000869774
<NAME>                       IMST-NJNAV3
<SERIES>
<NUMBER>                     2
<NAME>                       IMST-NJNAV3
       
<S>                          <C>
<FISCAL-YEAR-END>            Dec-31-1996
<PERIOD-START>               Jan-01-1996
<PERIOD-END>                 Dec-31-1996
<PERIOD-TYPE>                Year
<INVESTMENTS-AT-COST>        2,828,850
<INVESTMENTS-AT-VALUE>       3,075,224
<RECEIVABLES>                74,852
<ASSETS-OTHER>               0
<OTHER-ITEMS-ASSETS>         0
<TOTAL-ASSETS>               3,150,076
<PAYABLE-FOR-SECURITIES>     0
<SENIOR-LONG-TERM-DEBT>      0
<OTHER-ITEMS-LIABILITIES>    66,422
<TOTAL-LIABILITIES>          66,422
<SENIOR-EQUITY>              3,083,654
<PAID-IN-CAPITAL-COMMON>     0
<SHARES-COMMON-STOCK>        0
<SHARES-COMMON-PRIOR>        0
<ACCUMULATED-NII-CURRENT>    50,707
<OVERDISTRIBUTION-NII>       0
<ACCUMULATED-NET-GAINS>      (27,918)
<OVERDISTRIBUTION-GAINS>     0
<ACCUM-APPREC-OR-DEPREC>     246,374
<NET-ASSETS>                 3,083,654
<DIVIDEND-INCOME>            0
<INTEREST-INCOME>            205,420
<OTHER-INCOME>               0
<EXPENSES-NET>               8,252
<NET-INVESTMENT-INCOME>      197,168
<REALIZED-GAINS-CURRENT>     6,761
<APPREC-INCREASE-CURRENT>    (84,029)
<NET-CHANGE-FROM-OPS>        119,900
<EQUALIZATION>               0
<DISTRIBUTIONS-OF-INCOME>    198,698
<DISTRIBUTIONS-OF-GAINS>     255,789
<DISTRIBUTIONS-OTHER>        0
<NUMBER-OF-SHARES-SOLD>      0
<NUMBER-OF-SHARES-REDEEMED>  269
<SHARES-REINVESTED>          0
<NET-CHANGE-IN-ASSETS>       (334,587)
<ACCUMULATED-NII-PRIOR>      52,237
<ACCUMULATED-GAINS-PRIOR>    585
<OVERDISTRIB-NII-PRIOR>      0
<OVERDIST-NET-GAINS-PRIOR>   0
<GROSS-ADVISORY-FEES>        0
<INTEREST-EXPENSE>           0
<GROSS-EXPENSE>              0
<AVERAGE-NET-ASSETS>         0
<PER-SHARE-NAV-BEGIN>        944.79
<PER-SHARE-NII>              56.59
<PER-SHARE-GAIN-APPREC>      (20.31)
<PER-SHARE-DIVIDEND>         57.04
<PER-SHARE-DISTRIBUTIONS>    3.26
<RETURNS-OF-CAPITAL>         0
<PER-SHARE-NAV-END>          920.77
<EXPENSE-RATIO>              0
<AVG-DEBT-OUTSTANDING>       0
<AVG-DEBT-PER-SHARE>         0
        

</TABLE>

                       INSURED MUNICIPAL SECURITIES TRUST
                       NEW YORK NAVIGATOR INSURED SERIES 2
                        AMENDED REFERENCE TRUST AGREEMENT

                  This Amended Reference Trust Agreement dated May 1, 1991 among
Bear, Stearns & Co. Inc. and Gruntal & Co., Incorporated, as Depositors, United
States Trust Company of New York, as Trustee and Kenny S&P Evaluation Services,
a division of Kenny Information Systems, Inc., as Evaluator, amends that certain
"Insured Municipal Securities Trust, 47th Discount Series and Series 20, and
Subsequent Series, Trust Indenture and Agreement" dated June 16, 1989 (the
"Indenture"), as amended by that certain "Insured Municipal Securities Trust,
New York Navigator Insured Series 2, Reference Trust Agreement" dated May 10,
1990 among Bear, Stearns & Co. Inc. and Gruntal & Co., Incorporated, as
Depositors, United States Trust Company, as Trustee and Standard & Poor's
Corporation, as Evaluator (the "Reference Trust Agreement").


                                WITNESSETH THAT:


                  Pursuant to the provisions of Section 9.01 of the Indenture,
the Depositors, Trustee and Evaluator hereby agree to amend the Reference Trust
Agreement in order to correct certain typographical errors contained in that
Agreement and to restate certain portions of that Agreement so as to reflect
properly he intent of the parties hereto. The parties hereto, therefore, agree
as follows:

                  That paragraph (k) of Part II of the Reference Trust Agreement
be amended in their entirety to read as follows:

                   "(k) For the purposes of Section 6.04, the Trustee shall be
paid per annum $1.00 per $1,000 principal amount of Bonds for that portion of
the Trust under the monthly distribution plan, $.54 per $1,000 principal amount
of Bonds for that portion of the Trust under the semi-annual distribution plan
and $.36 per $1,000 principal amount of bonds for that portion of the Trust
under the annual distribution plan. During the first year after the date hereof,
such payments to the Trustee will be reduced by a portion [a maximum of $.83 per
Unit times the number of Units on the monthly distribution plan, $.54 per unit
plus $.29 of Trust expenses (to be assumed and paid by the Trustee) times the
number of Units on the semi-annual distribution plan and $.36 per Unit plus $.47
of trust expenses (to be assumed and paid by the Trustee) times the number of
Units of the annual distribution plan] of the amount of interest which accrues
on any

480240.1

<PAGE>



"when, as and if issued" Bonds between the first settlement date
of the Trust and the respective dates of delivery of such Bonds."


                  IN WITNESS WHEREOF, the parties hereto have caused this
Amended Reference Trust Agreement to be duly executed on the date first above
written.


                         [Signatures on separate pages]

480240.1
                                       -2-

<PAGE>



                                                     BEAR, STEARNS & CO. INC.
                                                       Depositor


                                                     By:
                                                         ----------------------
                                                         Authorized Signator

STATE OF NEW YORK                           )
                                            :  ss.:
COUNTY OF NEW YORK                          )


                  On this 1st day of May, 1991, before me personally appeared
Peter J. DeMarco, to me known, who being by me duly sworn, said that he is an
Authorized Signator of Bear, Stearns & Co. Inc., one of the corporations
described in and which executed the foregoing instrument, and that he signed his
name thereto by authority of the Board of Directors of said corporation.




                                                     -------------------------
                                                     Notary Public


480240.1
                                       -3-

<PAGE>



                                                     GRUNTAL & CO. INCORPORATED
                                                       Depositor


                                                     By:
                                                         ----------------------
                                                         Authorized Signator



STATE OF NEW YORK                           )
                                            :  ss.:
COUNTY OF NEW YORK                          )


                  On this 1st day of May, 1991, before me personally appeared
George Bernard, to me known, who being by me duly sworn, said that he is an
Authorized Signator of Gruntal & Co. Incorporated, one of the corporations
described in and which executed the foregoing instrument, and that he signed his
name thereto by authority of the Board of Directors of said corporation.



                                                     Notary Public


480240.1
                                       -4-

<PAGE>



                                                UNITED STATES TRUST COMPANY OF
                                                  NEW YORK, Trustee


                                                 By:
                                                    --------------------------- 
                                                    Assistant Vice President



STATE OF NEW YORK                           )
                                            :  ss.:
COUNTY OF NEW YORK                          )


                  On this ____ day of __________________, 199_, before me
personally appeared ________________________________, to me known, who being by
me duly sworn, said that he is an Authorized Signator of United States Trust
Company of New York, one of the corporations described in and which executed the
foregoing instrument; that he knows the seal of said corporation; that the seal
affixed to said instrument is such corporate seal; that it was so affixed by
authority of the Board of Directors of said corporation and that he signed
________________ name thereto by like authority.


                                              ---------------------------------
                                              Notary Public


480240.1
                                       -5-

<PAGE>


                                              KENNY INFORMATION SYSTEMS, INC.,
                                                Evaluator


                                              By:
                                                  -----------------------------
                                                  President


SEAL

ATTEST:


- -------------------------------
Executive Vice President
  and Secretary


480240.1
                                       -6-

                       INSURED MUNICIPAL SECURITIES TRUST
                       NEW YORK NAVIGATOR INSURED SERIES 3
                        AMENDED REFERENCE TRUST AGREEMENT

                  This Amended Reference Trust Agreement dated May 1, 1991 among
Bear, Stearns & Co. Inc. and Gruntal & Co., Incorporated, as Depositors, United
States Trust Company of New York, as Trustee and Kenny S&P Evaluation Services,
a division of Kenny Information Systems, Inc., as Evaluator, amends that certain
"Insured Municipal Securities Trust, 47th Discount Series and Series 20, and
Subsequent Series, Trust Indenture and Agreement" dated June 16, 1989 (the
"Indenture"), as amended by that certain "Insured Municipal Securities Trust,
New York Navigator Insured Series 3, Reference Trust Agreement" dated June 28,
1990 among Bear, Stearns & Co. Inc. and Gruntal & Co., Incorporated, as
Depositors, United States Trust Company, as Trustee and Standard & Poor's
Corporation, as Evaluator (the "Reference Trust Agreement").


                                WITNESSETH THAT:


                  Pursuant to the provisions of Section 9.01 of the Indenture,
the Depositors, Trustee and Evaluator hereby agree to amend the Reference Trust
Agreement in order to correct certain typographical errors contained in that
Agreement and to restate certain portions of that Agreement so as to reflect
properly the intent of the parties hereto. The parties hereto, therefore, agree
as follows:

                  That paragraphs (g) and (i) of Part II of the Reference Trust
Agreement be amended in their entirety to read as follows:

                  "(g)     The First Settlement Date shall mean July 6, 1990.

                   (i) For the purposes of Section 4.02, the Evaluator shall
receive for each evaluation of the Bonds in the Trust a minimum fee of $8, plus
a fee of $0.25 for determining the aggregate value of each issue of Bonds in
excess of 50 issues (treating separate maturities of Bonds as separate issues)."


                  IN WITNESS WHEREOF, the parties hereto have caused this
Amended Reference Trust Agreement to be duly executed on the date first above
written.


                         [Signatures on separate pages]

480138.1

<PAGE>



                                                     BEAR, STEARNS & CO. INC.
                                                       Depositor


                                                     By:
                                                        -----------------------
                                                         Authorized Signator



STATE OF NEW YORK                           )
                                            :  ss.:
COUNTY OF NEW YORK                          )


                  On this 1st day of May, 1991, before me personally appeared
Peter J. DeMarco, to me known, who being by me duly sworn, said that he is an
Authorized Signator of Bear, Stearns & Co. Inc., one of the corporations
described in and which executed the foregoing instrument, and that he signed his
name thereto by authority of the Board of Directors of said corporation.




                                                     --------------------------
                                                     Notary Public


480138.1
                                       -2-

<PAGE>



                                                     GRUNTAL & CO. INCORPORATED
                                                       Depositor


                                                     By:
                                                        -----------------------
                                                        Authorized Signator



STATE OF NEW YORK                           )
                                            :  ss.:
COUNTY OF NEW YORK                          )


                  On this 1st day of May, 1991, before me personally appeared
George Bernard, to me known, who being by me duly sworn, said that he is an
Authorized Signator of Gruntal & Co. Incorporated, one of the corporations
described in and which executed the foregoing instrument, and that be signed his
name thereto by authority of the Board of Directors of said corporation.



                                                     --------------------------
                                                     Notary Public


480138.1
                                       -3-

<PAGE>



                                                 UNITED STATES TRUST COMPANY OF
                                                   NEW YORK, Trustee


                                                 By:
                                                    ---------------------------
                                                     Assistant Vice President



STATE OF NEW YORK                           )
                                            :  ss.:
COUNTY OF NEW YORK                          )


                  On this ____ day of _______________________, 199_, before me
personally appeared , to me known, who being by me duly sworn, said that he is
an Authorized Signator of United States Trust Company of New York, one of the
corporations described in and which executed the foregoing instrument; that he
knows the seal of said corporation; that the seal affixed to said instrument is
such corporate seal; that it was so affixed by authority of the Board of
Directors of said corporation and that he signed ____________ name thereto by
like authority.



                                                     -------------------------
                                                     Notary Public


480138.1
                                       -4-

<PAGE>


                                               KENNY INFORMATION SYSTEMS, INC.,
                                                 Evaluator


                                                By:
                                                   ----------------------------
                                                   President


SEAL

ATTEST:


- -------------------------------
Executive Vice President
  and Secretary


480138.1
                                       -5-

                            CERTIFICATE OF FORMATION

                                       OF

                              GRUNTAL & CO., L.L.C.


               This Certificate of Formation of Gruntal & Co., L.L.C. (the
"Company"), dated as of March 4, 1997, is being duly executed and filed by
Harriet J. Whiting, as an authorized person, to form a limited liability company
under the Delaware Limited Liability Company Act (6 Del. C. ss. 18-101, et
seq.).

               FIRST. The name of the limited liability company formed is
Gruntal & Co., L.L.C.

               SECOND. The address of the registered office of the Company in
the State of Delaware is the Corporation Trust Center, 1209 Orange Street, New
Castle County, Wilmington, Delaware 19801.

               THIRD. The name and address of the registered agent for
service of process on the Company in the State of Delaware is The Corporation
Trust Company, 1209 Orange Street, Wilmington, Delaware 19801.

               IN WITNESS WHEREOF, the undersigned has executed this
Certificate of Formation as of the date first above written.



                                             --------------------------------
                                             Harriet J. Whiting
                                             Authorized Person


483344.1

                    [Letterhead of Freeman, Zeller & Bryant]



                                  [Insert Date]


[Name of Sponsor(s)]




          Re: [Name of Trust]

Gentlemen:

          You have requested our opinion as to certain New Jersey income tax
issues relating to the New Jersey Navigator Insured Series _ Trust of The
Insured Municipal Securities Trust (the "Trust"). Our opinion relates solely to
the New Jersey tax matters described herein. It is our understanding that [Name
of Trust Counsel], counsel for the Sponsor(s) (defined below) has rendered an
opinion as to federal tax matters pertaining to the Trust.

          In rendering this opinion, we have examined and, with your permission
relied upon, among other things, (1) only those portions of the prospectus dated
____ __, 199_ (the "Prospectus") (consisting, in part, of Part A providing
specific information as to the separate unit investment trusts including the
Trust and Part B containing generic information applicable to The Insured
Municipal Securities Trust) relating to the Trust, and we have relied on the
accuracy and the completeness of the facts set forth therein; and (2) a copy of
the Trust Indenture and Agreement dated _________ __, 199_ (the "Trust
Agreement"), among [Name of Sponsor(s), Trustee and Evaluator, if any], pursuant
to which the Trust was created.

          In addition, with your permission, we have (1) relied upon the opinion
of [Name of Trust Counsel] that the Trust is not an association taxable as a
corporation for federal income tax purposes, that each Certificateholder will be
considered the owner of a pro rata portion of the Trust under Section 676(a) of
the Internal Revenue Code of 1986 (the "Code") and as to certain other federal
tax matters pertaining to the Trust; and (2) assume that the Trust is a "grantor
trust" for federal income tax purposes.

          The Trust consists of a separate unit investment trust created under
the laws of the State of New York pursuant to the Trust Agreement and a
Reference Trust Agreement pertaining to the Trust. The Trust will be
administered in accordance with the

C/M:  11939.0001 480301.1

<PAGE>


                                                                          Page 2


Trust Agreement as a distinct entity with separate certificates, expenses, books
and records.

          The Bonds deposited in the Trust are certain interest-bearing
obligations issued by or on behalf of the State of New Jersey and political
subdivisions thereof and may also include bonds issued by the Commonwealth of
Puerto Rico. The Bonds are held by the Trustee upon the terms and conditions set
forth in the Trust Agreement. You have informed us that all Bonds to be acquired
by the Trust, pursuant to the contracts of purchase described in the Prospectus,
are accompanied by copies of the opinions of bond counsel to the issuing
governmental authorities given at the time of original delivery of the Bonds to
the effect that the interest on the Bonds contained in the Trust is exclud-able
from gross income for federal income tax purposes and the interest and gain
thereon are exempt from the New Jersey Gross Income Tax. For purposes of this
opinion we have relied upon such conclusions, however, we have not made any
independent review of the proceedings relating to the issuance of the Bonds or
the basis for such opinions, and we express no opinion on such matters.
Additionally, we assume that no event has occurred since the time of original
issuance of the Bonds that would cause interest on the Bonds to be includable in
gross income for federal income tax or New Jersey Gross Income Tax purposes.

          Under the terms and conditions of the Trust Agreement, once the
original corpus of the Trust is acquired, the Trust has a fixed portfolio of
Bonds. The Trustee does not have the power to vary the investment of the Trust
or the power to take advantage of market variations to improve a
Certificateholder's investment. Additionally, the Trustee has no discretion to
retain and reinvest the income or principal of the Trust.

          Based on the foregoing, under existing New Jersey law applicable to
individuals who are New Jersey residents and New Jersey estates and trusts, we
are of the opinion that:

          1) The New Jersey Navigator Trust will be recognized as a trust and
not as an association taxable as a corporation.

          2) The income of the New Jersey Navigator Trust will be treated as
income of the Certificateholders who are individuals, estates or trusts under
the New Jersey Gross Income Tax Act, N.J.S.A. 54A:l-l et seq. (the "Act").
Interest on the Bonds that is exempt from tax under the Act when received by the
New Jersey Navigator Trust will retain its status as tax-exempt interest under
the Act when distributed to Certificateholders who are individuals, estates or
trusts.


C/M:  11939.0001 480301.1

<PAGE>


                                                                          Page 3


          3) Certificateholders, who are individuals, estates, or trusts will
not be subject to the Act on any gain realized when the New Jersey Navigator
Trust disposes of a Bond (whether by sale, exchange, redemption, or payment at
maturity).

          4) The sale, exchange or redemption of a Unit by a Certificateholder
shall be treated as a sale or exchange of a Certificateholder's pro rata
interest in the assets in the New Jersey Navigator Trust at the time of the
transaction and any gain will be exempt from tax under the Act to the extent
that the price received by the selling Certificateholder who is an individual,
estate or trust does not exceed the Redemption Price. To the extent that the
amount received by the Certificateholder exceeds the Redemption Price, any such
gain will not be exempt from tax under the Act.

          5) All proceeds representing interest on defaulted obligations derived
by Certificateholders who are individuals, estates or trusts from an insurance
policy, either paid directly to the Certificateholder or through the New Jersey
Navigator Trust, are exempt from tax under the Act.

          6) The Units of the New Jersey Navigator Trust may be taxable, in the
estates of New Jersey residents under the New Jersey Transfer Inheritance Tax
Law or the New Jersey Estate Tax Laws.

          We express no opinion as to the effect of any other state or local
statute or ordinance on income received by a Certificateholder other than as
expressly set forth herein.

          Our opinion is based on current provisions of the laws cited herein.
Any change in such laws, the regulations or interpretations relating to such
laws may affect the continuing validity of the opinion set forth herein.

          We hereby consent to the filing of this opinion as an exhibit to a
Registration Statement under the Securities Act of 1933, as amended, covering
the Units in the Trust, and to the reference to our firm in such Registration
Statement and in the prospectus included therein under the heading "Tax Status".



C/M:  11939.0001 480301.1

<PAGE>


                                                                          Page 4

          We hereby authorize you to deliver copies of this opinion to the
Trustee and to the underwriters named in Schedule A to the Master Agreement
Among Underwriters relating to the Trust and the Trustee may rely upon this
opinion as fully and to the same extent as if it had been addressed to it.

                                  Very truly yours,



                                  FREEMAN, ZELLER & BRYANT


C/M:  11939.0001 480301.1

                                CUSTODY AGREEMENT

         CUSTODY AGREEMENT dated as of January 18, 1990 among United States
Trust Company of New York, a New York corporation, as custodian (the
"Custodian"), Municipal Bond Investors Assurance Corporation (the
"Corporation"), Bear Stearns & Co., Inc. and Bear Stearns & Co., Inc. as
attorney in fact for Gruntal & Co., Incorporated (collectively the "Sponsor"),
and United States Trust Company of New York or any successor trustee, as trustee
(the "Trustee") for various series of the Insured Municipal Securities Trust,
New York Navigator Insured Series, sponsored by the Sponsor (the "Funds") each
such series consisting of one or more underlying separate unit investment
trusts.

                                    RECITALS

         A. The Sponsor has deposited and will deposit into each of the Funds
those obligations (the "Obligations") described in the appropriate schedule to
the related Reference Trust Agreement ("Trust Indenture") among the Sponsor and
the Trustee dated the date of deposit of each of the related Funds. Each of the
Funds will be specifically named and numbered and will be referred to herein
individually as a "Fund."

         B.       In accordance with the provisions hereof, the Trustee
will deliver to the Custodian for immobilization by the Custodian
all the Obligations deposited in any Fund as promptly as possible
after the deposit of such Obligations.  The Sponsor and the
Trustee intend to permit the sale of any Obligation from the

479906.1

<PAGE>



related Funds only as such Obligation has been immobilized as set
forth herein.

         C. Upon the deposit of the Obligations in the related Funds, the
Corporation issues to the Trustee its Financial Guaranty Master Insurance Policy
(the "Master Policy") which insures the scheduled payments of principal and
interest to maturity on the Obligations.

         D. Following the deposit with the Trustee of all the Obligations in a
Fund, the Trustee is to deposit with the Custodian, with respect to a particular
Fund, the Obligations and the related Master Policy to be held by the Custodian
in accordance with the provisions of this Custody Agreement. Such deposit and
holding shall be referred to herein as "Immobilization."

         E. Upon completion of the Immobilization of all Obligations in a
particular Fund, the Custodian will deliver to the Corporation a confirmation in
the form attached hereto as Exhibit 1 (the "Confirmation"). The Corporation will
replace the related Master Policy with a Financial Guaranty Master Custodian
Policy relating to such immobilized Obligations issued to the Custodian (the
"Custodian Policy") substantially in the form attached hereto as Exhibit 2. The
Custodian Policy will guarantee the payments to the Custodian of regularly
scheduled principal of and interest on the immobilized Obligations. The coverage
provided by the Custodian Policy will be substantially similar to the coverage
provided by the Master Policy.

                                      - 2 -
479906.1

<PAGE>



         F.       It is understood by the parties hereto that the
function of the Custodian hereunder is purely ministerial in
nature.

         Accordingly, the Sponsor, the Corporation, the Trustee and the
Custodian agree to the following terms to govern the custodial relationship
created hereby:

         1. Immobilization of the Obligations and the Custodian Policies.

                  a.       As soon as possible after the deposit of all
         Obligations in a Fund, the Trustee will cause all
         Obligations in such Fund to be delivered to the Custodian.

                  b. The parties agree that upon Immobilization of the
         Obligations, a Custodian Policy will be issued to replace a related
         Master Policy. Prior to the issuance of a Custodian Policy, the Trustee
         will deliver to the Corporation and to the Custodian, via telecopy or
         hand delivery, a completed Schedule pertaining to the Obligations which
         the Trustee shall deliver to the Custodian for immobilization. The
         Custodian will deliver to the Corporation and the Trustee a
         Confirmation. If such Schedule and Confirmation are so delivered, the
         Corporation will deliver the applicable Custodian Policy to the
         Custodian in exchange for the applicable Master Policy, on the date
         that the Obligations become subject to the Custody Agreement, which
         date will be specified in the Schedule (the "Settlement Date");
         provided that the Settlement Date will not occur earlier than the

                                      - 3 -
479906.1

<PAGE>



         fourth Business Day next succeeding the date the Corporation receives
         the appropriate Schedule. For purposes of this paragraph 1, the term
         "Business Day" means any day of the year other than: (i) a Saturday or
         a Sunday, (ii) a day on which the Corporation, the Custodian or the
         Trustee are not open for business, or (iii) a day on which the New York
         Stock Exchange is closed.

                  c. The Sponsor and the Trustee agree that all Obligations will
         be deposited with the Custodian pursuant to this Custody Agreement on
         the Settlement Date. The Trustee will deliver to the Custodian, on the
         Settlement Date, if not already on deposit with the Custodian, (x) in
         the case of Obligations which are not eligible for deposit with The
         Depository Trust Company ("DTC"), the physical Obligations listed on
         the Schedule in bearer form or duly endorsed in blank or accompanied by
         all necessary instruments of assignment and transfer in blank, or (y)
         in the case of Obligations which are DTC eligible, the Obligations by
         credit to the account of the Custodian at DTC; and, where required by
         the rules of the Municipal Securities Rulemaking Board, a Bond Interest
         Advance check pursuant to such rules; and the Corporation will deliver
         the applicable Custodian Policies in proper form to be held and the
         proceeds thereof to be applied by the Custodian as herein provided. The
         Custodian agrees to hold the Obligations and the applicable

                                      - 4 -
479906.1

<PAGE>



         Custodian Policies in its custody subject to the terms of this Custody
         Agreement.

                  d. On the Settlement Date, the Custodian will receive the
         applicable Custodian Policy. The Custodian will issue to the
         Corporation an acknowledgment substantially in the form annexed hereto
         as Exhibit 3 (the "Acknowledgment") evidencing that the Obligations of
         a particular issue and the Custodian Policy applicable thereto are in
         its custody and are subject to this Custody Agreement. No
         Acknowledgment will relate to more than one Custodian Policy.

                  e. (i) Upon delivery to the Custodian of the Obligations in
         bearer form which by their terms are exchangeable for Obligations in
         registered form, the Custodian shall, as soon as practicable, present
         such Obligations to the registrar or transfer agent of the issuer of
         such Obligations for registration or registration of transfer, as the
         case may be, in the name of the Custodian or its nominee or endorsed by
         the registered owner for transfer to the Custodian or its nominee; or

                  (ii)  Upon delivery to the Custodian of Obligations in
         bearer form which are not exchangeable for Obligations in
         registered form, the Custodian shall hold such Obligations
         in the form in which such Obligations were received.

         2. Creation of Insured Position.  The Custodian will, upon
receipt of the Obligations and the applicable Master Policy

                                      - 5 -
479906.1

<PAGE>



confirm that DTC has credited the account of the Custodian by the creation of a
book entry position at DTC (the "Book Entry Position") pursuant to the shipment
control list sent to the Custodian by DTC in substantially the form annexed
hereto as Exhibit 4. The account of DTC's nominee, CEDE & CO., will be credited
with payments due from time to time pursuant to a Standard Representation Letter
from the Custodian to DTC in the form annexed hereto as Exhibit 5. Each Book
Entry Position will evidence that Obligations of a single issue are in the
custody of the Custodian, and no Book Entry Position will relate to more than a
single issue of Obligations.

         3. Rights of Related Beneficial Owners. The sole obligor with respect
to Obligations described in a Book Entry Position will be the issuer of such
Obligations (the "Issuer"). If the Issuer defaults on the payment of principal
of and/or interest on the Obligations each owner of a beneficial interest
created pursuant to that particular Book Entry Position (the "Related Beneficial
Owner") will have the right to proceed directly and individually against the
Issuer in whatever manner is deemed to be appropriate by the Related Beneficial
Owner, and will not be required to act in concert with the Custodian, DTC, CEDE
& CO., other Related Beneficial Owners or any other beneficial owner of an
interest created in any other Book Entry Position. The creation of a Book Entry
Position will not in any manner: (i) alter, modify or increase the rights of the
Related Beneficial Owner with respect to the Obligations to which such Book
Entry


                                      - 6 -
479906.1

<PAGE>



Position is applicable (provided that payments of principal of and interest on
the Obligations and proceeds of the applicable Custodian Policies will be paid
to the Related Beneficial Owner as provided herein), (ii) grant to any
beneficial owner of any other Book Entry Position rights with respect to the
Book Entry Position or the Obligations described in clause (i), or (iii) grant
to such Related Beneficial Owner rights with respect to any other Book Entry
Position or the Obligations to which such other Book Entry Position is
applicable. The parties hereto understand and agree that each Related Beneficial
Owner will hold title to its respective Obligations (but will have no interest
in Obligations or beneficial interests purchased by any other Related Beneficial
Owner), and that the Custodian will hold Obligations as bailee for the
applicable Related Beneficial Owners.

         4. Obligations of the Custodian.  During the term of this
Custody Agreement, the Custodian will have the following
obligations:

                  a. Custody of the Obligations and the Custodian Policies. The
         Custodian will maintain custody of each Obligation and Custodian Policy
         until the earlier to occur of: (i) payment of the Obligation in full,
         including all accrued interest, on its respective stated maturity date,
         (ii) payment under the Custodian Policy in full, including all accrued
         interest, on the stated maturity date of the Obligation or (iii)
         payment of the Obligation in full, together with

                                      - 7 -
479906.1

<PAGE>



         all accrued interest, by the Issuer or, if applicable, under the
         Custodian Policy on an earlier date on which the Obligation will have
         been fully redeemed. All Obligations deposited with the Custodian
         hereunder and all moneys relating thereto will be segregated by
         separate recordation on the records of the Custodian so long as such
         practice preserves a valid preference under applicable law, or if such
         preference is not so preserved the Custodian will handle such
         Obligations and moneys in such other manner as will constitute the
         segregation and holding thereof in trust within the meaning of the
         Investment Company Act of 1940. The Custodian may deposit Obligations
         which are DTC eligible with DTC for the account of the Custodian. No
         Obligation will be available to the Custodian for its own use or
         profit, nor will any Obligation be deemed to be part of the general
         assets of the Custodian. The Obligations will not be subject to any
         right, charge, security interest, lien or claim of any kind in favor of
         the Custodian.

                  b. Payments of Interest and Principal. The Custodian will be
         responsible for the collection of the interest on and principal of the
         Obligations or any proceeds of the Custodian Policies in lieu thereof
         and the remittance thereof to CEDE & CO. as the registered owner of a
         Book Entry Position for payment of such proceeds by such registered
         owner to the owners of beneficial interests in such Book Entry Position
         or Book Entry Positions. The Custodian will remit payments of interest
         or principal with respect to the Obligations to CEDE & CO., in next-day
         funds or the equivalent, on each interest payment date in the case of
         payments of interest and on the stated maturity date or

                                      - 8 -
479906.1

<PAGE>



         such earlier date or dates on which the Obligations will have been
         redeemed in the case of payments of principal.

                  c. Payments Under the Custodian Policies. The Custodian will
         remit all proceeds received under the Custodian Policies representing
         interest or principal with respect to the Obligations to CEDE & CO., in
         next-day funds or the equivalent, on the day after the date the
         Custodian actually receives such insurance proceeds.

                  d. Maintenance of Fidelity Bond.  During the term hereof,
         the Custodian will maintain a Banker's Blanket Bond in accordance
         with its policies and any requirements of law.

         5. Limitation on the Rights and Duties of the Custodian. The Custodian
will exercise only the duties expressly required or permitted by this Custody
Agreement, which duties are intended to be ministerial in nature only. The
Custodian will not: (i) assert the rights and privileges of any Related
Beneficial Owner unless the Custodian has been specifically requested to do so
by such Related Beneficial Owner, and the Custodian, at its sole option, agrees
to take such action, (ii) guarantee or increase the security for the Obligations
(as insured by the applicable Custodian Policies), or (iii) in any manner act in
a management capacity with respect to the Obligations.

         6. Payments to the Corporation and the Funds.  Neither the
Corporation nor any Fund will derive any compensation solely as a
result of the deposit of Obligations with the Custodian. The Corporation will
not be obligated to make any payments to any party (except as otherwise
expressly agreed to in writing by the Corporation and the Custodian) in
connection with such deposit of Obligations or the custodial relationship
established pursuant to this Custody

                                      - 9 -
479906.1

<PAGE>



Agreement except in accordance with the terms of the applicable Custodian
Policies.

         7. Termination of the Custodian's Obligations; Appointment of Successor
Custodian. The obligations of a particular custodian hereunder may be terminated
by either the Custodian or the Sponsor (except as otherwise provided in this
paragraph 7) sixty (60) days after the receipt of written notice of termination
from the Custodian or the Sponsor, as the case may be, specifying in detail the
reason for such termination, which notice will be addressed to the Sponsor or
the Custodian, as the case may be, upon the failure of the other party fully to
perform any of its material obligations hereunder; provided that if such failure
to perform is cured to the reasonable satisfaction of the non-defaulting party
within such sixty (60) day period, such obligations will not be so terminated.
Copies of such notice will be given to the Corporation and the Trustee on the
same date that the notice is given to the defaulting party. To the extent
permitted by applicable law, the Corporation will have the right, but not the
obligation, to cure any such failure to perform by the defaulting party. In the
event a written notice of termination has been received by the applicable party,
the Custodian will not have any obligation to accept the deposit of any
additional Obligations unless and until such time as the failure to perform
specified in the notice is cured as provided above. The Custodian will, in any
case, retain all Obligations and the Custodian Policies which were subject to
this Custody Agreement as of the date of receipt of such notice by the
applicable party and will continue to perform its obligations hereunder with
respect to such Obligations and Custodian Policies until such time as: (i) a
successor custodian is appointed by the

                                     - 10 -

479906.1

<PAGE>



Sponsor, with the prior written consent of the Corporation and the Trustee, and
(ii) such successor custodian accepts such appointment. If the Sponsor, the
Corporation and the Trustee cannot reach an agreement on the selection of a
successor custodian by the ninetieth (90th) day following receipt of the notice,
the Corporation, the Trustee and the Sponsor will petition a New York court of
competent jurisdiction for the appointment of a successor custodian and such
court may thereupon appoint such successor custodian. Termination of the
obligations of a particular custodian pursuant to this paragraph 7 will not be
deemed to terminate any Custodian Policy.

         8. Resignation of the Custodian. The Custodian may resign with respect
to all of its duties hereunder at any time by written notice thereof delivered
to the Corporation, such resignation to take effect upon the appointment of a
successor custodian pursuant to the provisions of Section 10 hereof; provided,
however, that in the event of such resignation, the Custodian shall (a) assist
the Corporation in its efforts to identify a successor custodian and (b) assist
the Corporation in its negotiations with such proposed successor custodian
regarding the fees and expenses to be charged by the successor custodian.

         9. Termination of the Custody Agreement and all
Oblig-ations of all Parties Hereto.  This Custody Agreement

                                     - 11 -
479906.1

<PAGE>



and the obligations of the parties hereto will terminate, as regards any one or
more Obligations and the related Book Entry Position or Book Entry Positions,
upon the maturity or final redemption of all of the Obligations, or the payment
of all of the proceeds under the Custodian Policies in lieu of payment in full
of all such Obligations, including all accrued interest, by the respective
Issuers. This Custody Agreement and the custodial relationship created hereby,
including all obligations of the parties hereto, will be terminated upon the
mutual written consent of the parties hereto, in accordance with and subject to
the terms of such written consent.

         10. Appointment of Successor Custodian.  If this Custody Agreement
is terminated by written agreement pursuant to Section 7 hereof, or if the
Custodian resigns pursuant to Section 8 hereof, a successor custodian will be
appointed as follows: a. The Sponsor will, within 60 days after delivery of the
notice of resignation or notice of termination, appoint a successor custodian.
If no successor custodian has been appointed within 60 days, the Custodian may
petition any court of competent jurisdiction for the appointment of a successor
custodian. In such case, the Custodian's resignation

                                     - 12 -
479906.1

<PAGE>



shall not become effective until the appointment of such successor custodian.

                  b. Any successor custodian (i) will be a corporation organized
         and doing business under the laws of the United States or the State of
         New York, which is authorized under such laws to exercise corporate
         trust powers, and which is a participant in DTC, (ii) will have an
         aggregate capital, surplus, and undivided profits of not less than
         $50,000,000, and (iii) will have its principal office and place of
         business in the Borough of Manhattan, the City and State of New York.
                  c. The Custodian will deliver to its successor the
         Obligations, the related Custodian Policies and any documentation
         related to them or to the Book Entry Positions and will remit to the
         successor custodian any payments received by the Custodian with respect
         to such Obligations, Custodian Policies or Book Entry Positions and any
         unamortized fees. The retiring Custodian shall, upon payment of its
         fees and charges, duly assign, transfer and deliver to such successor
         custodian, the Custodian Policy and all records, Obligations and moneys
         held by such retiring Custodian pursuant to the terms of this Custody
         Agreement. Any successor custodian appointed hereunder will execute,


                                     - 13 -
479906.1

<PAGE>



         acknowledge and deliver to its predecessor and to the Corporation an
         instrument in writing accepting such appointment, and thereupon such
         successor, without any further act, will become fully vested with all
         the rights, duties and obligations of its predecessor.

                  d.       The successor Custodian shall send notice of
         its appointment to each Beneficial Owner within 10 days
         of such appointment.

         11. Governing Law. This Custody Agreement will be governed by and
construed in accordance with the laws of the State of New York.

         12. Amendment of Agreement. The Corporation and the Custodian may
enter into any amendments, modifications or supplements to this Custody
Agreement, without the consent of the Beneficial Owners of Book Entry
Positions, which will not adversely affect the interest of any such Beneficial
Owner. This Custody Agreement may not be amended, changed, modified, altered or
terminated without the written consent of all of the parties hereto.

         13. Limitations on Assignment; Delegation. The rights and obligations
of the parties hereunder may not be assigned or delegated without the prior
written consent of the other parties hereto.

                                     - 14 -
479906.1

<PAGE>



         14. Limitations on Transfer of Obligations.  Title to Obligations
will not be transferred except in accordance with this Custody Agreement
and the Standard Representation Letter and the shipment control list.

         15. Severability. In the event any provision of this Custody Agreement
is held invalid or unenforceable by any court of competent jurisdiction, such
holding will not invalidate or render unenforceable any other provision hereof.

         16. Further Assurances and Corrective Instruments. To the extent
permitted by law, the parties hereto agree that they will, from time to time,
execute, acknowledge and deliver, or cause to be executed, acknowledged and
delivered, such supplements hereto and such further instruments to which they
mutually agree in writing, as may reasonably be required for carrying out the
intention of or facilitating the performance of this Custody Agreement.

         17. Liability of Custodian. The Custodian will not be liable to any
person for the performance of its duties hereunder except liability which is
adjudicated by a court of competent jurisdiction to have arisen from its gross
negligence, bad faith or willful misconduct in connection with the performance
of its duties hereunder.

                                     - 15 -
479906.1

<PAGE>



         18. Notices. Any notice hereunder will be in writing and will be duly
given if delivered to the Sponsor at 245 Park Avenue, New York, New York 10167,
or at such other address as may be specified by the Sponsor to the Custodian,
the Corporation and the Trustee in writing, or to the Trustee at its unit trust
office, 770 Broadway, New York, New York 10003, Attention: UIT Administration,
or at such other address as may be specified by the Trustee to the Sponsor, the
Corporation and the Custodian in writing, or to the Custodian at its unit trust
office, 770 Broadway, New York, New York 10003, Attention: Unit Trust Division,
or at such other address as may be specified by the Custodian to the
Corporation, the Trustee and the Sponsor in writing or to the Corporation at 113
King Street, Armonk, New York 10504, Attention: Manager, Documentation and
Closing, or at such other address as may be specified by the Corporation to the
Sponsor, the Custodian and the Trustee in writing.

         19. Counterparts.  This Custody Agreement may be
executed in several counterparts, each of which will be an
original and all of which together will constitute but one
and the same instrument.

         IN WITNESS WHEREOF, Bear Stearns & Co., Inc., as Sponsor, and as
attorney in fact for Gruntal & Co., Incorporated has caused this Custody
Agreement to be executed on its

                                     - 16 -
479906.1

<PAGE>



behalf by one of its Vice Presidents, and its corporate seal to be hereto
affixed by one of its Assistant Secretaries; United States Trust Company of New
York, as Custodian, has caused this Custody Agreement to be executed on its
behalf by one of its Assistant Vice Presidents and its corporate seal to be
hereto affixed by one of its Assistant Secretaries; Municipal Bond Investors
Assurance Corporation, as insurer, has caused this Custody Agreement to be
executed on its behalf by one of its duly authorized officers and attested to by
one of its duly authorized officers; and United States Trust Company of New
York, as Trustee, or any successor trustee, has caused this Custody Agreement to
be executed on its behalf by one of its duly authorized officer Senior Vice
Presidents or Vice Presidents and its corporate

                                     - 17 -
479906.1

<PAGE>


seal to be hereto affixed by one of its Assistant Secretaries, all as of
the date first written above. 

                                   BEAR STEARNS & CO., INC., a Sponsor (Seal)

                                   By
                                     -----------------------------------------
Attest:                                 Managing Director


By
  --------------------------
    Vice President

                                   UNITED STATES TRUST COMPANY OF
                                   NEW YORK, Custodian
(Seal)

                                   By
                                      ----------------------------------------
Attest:                                 Assistant Vice President


By
  --------------------------
    Assistant Secretary


                                   UNITED STATES TRUST COMPANY OF
                                   NEW YORK, Custodian
(Seal)

                                   By
                                      ----------------------------------------
Attest:                                 Assistant Vice President
By
  --------------------------
    Assistant Secretary


                                     - 18 -
479906.1

<PAGE>



                                   MUNICIPAL BOND INVESTORS
                                   ASSURANCE CORPORATION


                                   By
                                     -----------------------------------------
Attest:                                 President



By
  --------------------------
    Assistant Secretary


                                     - 19 -
479906.1

<PAGE>


                                   BEAR STEARNS & CO., INC.,
                                   Attorney in Fact for Gruntal & Co.,
                                   Incorporated

(Seal)
                                   By
                                     -----------------------------------------
Attest:                                 Managing Director

By
  --------------------------
    Vice President


                                                     - 20 -
479906.1

                      FIRST AMENDMENT TO CUSTODY AGREEMENT


                  This First Amendment to the Custody Agreement (the "First
Amendment") dated as of July 20, 1990 among United States Trust Company of New
York, a New York Corporation, as custodian (the "Custodian"), Municipal Bond
Investors Assurance Corporation (the "Corporation"), Bear Stearns & Co., Inc.
and Bear Stearns & Co., Inc., as attorney in fact for Gruntal & Co.,
Incorporated (collectively, the "Sponsor"), and United States Trust Company of
New York or any successor trustee, as trustee (the "Trustee") for various series
of the Insured Municipal Securities Trust, Navigator Insured Series, sponsored
by the Sponsor (the "Funds"), each such series consisting of one or more
underlying separate unit investment trusts.

                                    RECITALS
                  A.  The Sponsor wishes to deposit obligations into Funds in
addition to the New York Navigator Insured Series.

                  B.  Section 12 of the Custody Agreement dated as of
January 18, 1990 (the "Original Custody Agreement") among the Custodian,
the Corporation, the Sponsor and the Trustee provides that it may be amended
with the written consent of the parties thereto. Accordingly, the Custodian, the
Corporation, the Sponsor and the Trustee agree as follows:

480255.1

<PAGE>



                  1.  The definition of "Fund" in the Original Custody
         Agreement is amended to add "and other Navigator Insured
         Series".

                  2. Upon execution of this First Amendment, all the terms and
         conditions of the Original Custody Agreement shall remain in full force
         and effect and be binding upon and enforceable by and against the
         Custodian, the Corporation, the Sponsor and the Trustee except as such
         terms and conditions are amended by this First Amendment.

                  3. This First Amendment may be executed in several
         counterparts, each of which will be an original and all of which
         together will constitute but one instrument.

                  IN WITNESS WHEREOF, each of the parties hereto has caused this
First Amendment to be duly executed, in counterparts in its respective name, all
as of the date first written above.

                                                     BEAR STEARNS & CO., INC.,
                                                       Sponsor


                                                     By:
                                                        -----------------------
                                                        Managing Director

Attest:


By:_______________________
    Vice President


480255.1
                                       -2-

<PAGE>



                                                 UNITED STATES TRUST COMPANY OF
                                                 NEW YORK, Custodian


                                                 By:
                                                    ---------------------------
                                                      Assistant Vice President

Attest:


By:_______________________
    Vice President


                                                 UNITED STATES TRUST COMPANY OF
                                                 NEW YORK, Trustee


                                                 By:
                                                    ---------------------------


Attest:


By:      _________________________
         Assistant Secretary


480255.1
                                       -3-

<PAGE>



                                             MUNICIPAL BOND INVESTORS ASSURANCE
                                                CORPORATION


                                             By:
                                                -------------------------------


Attest:


By:      _________________________




480255.1
                                       -4-

<PAGE>


                                            BEAR STEARNS & CO., INC.,
                                            Attorney in Fact for Gruntal & Co.,
                                              Incorporated


                                            By:
                                               --------------------------------
                                                 Managing Director



Attest:


By:__________________________
   Vice President



480255.1
                                       -5-

J.J. Kenny               Frank A. Ciccotto, Jr.
65 Broadway              Vice President
New York, NY 10006-2551  Tax-Exempt Evaluations
Tel 212 770 4422
Fax 212 797 8681

                                 Standard & Poor's
                                        A Division of The McGraw-Hill Companies




April 30, 1997



Reich & Tang Distributors L.P.
600 Fifth Avenue
New York, NY 10020


                                    Re:     Insured Municipal Securities Trust,
                                            Series 23 and New York Navigator
                                            Insured Series 2

Gentlemen:

          We have examined the post-effective Amendment to the Registration
Statement File No. 33-31426 for the above-captioned trust. We hereby acknowledge
that Kenny S&P Evaluation Services, a division of J.J. Kenny Co., Inc. is
currently acting as the evaluator for the trust. We hereby consent to the use in
the Amendment of the reference to Kenny S&P Evaluation Services, a division of
J.J. Kenny Co., Inc. as evaluator.

         In addition, we hereby confirm that the ratings indicated in the
above-referenced Amendment to the Registratin Statement for the respective bonds
comprising the trust portfolio are the ratings indicated in our KENNYBASE
database.

         You are hereby authorized to file a copy of this letter with the
Securities and Exchange Commision.

                                   Sincerely,




                                   Frank A. Ciccotto


FAC/trh


<PAGE>
J.J. Kenny               Frank A. Ciccotto, Jr.
65 Broadway              Vice President
New York, NY 10006-2551  Tax-Exempt Evaluations
Tel 212 770 4422
Fax 212 797 8681

                                 Standard & Poor's
                                        A Division of The McGraw-Hill Companies




April 30, 1997


Reich & Tang Distributors L.P.
600 Fifth Avenue
New York, NY 10020


                                    Re:     Insured Municipal Securities Trust,
                                            New York Navigator
                                            Insured Series 3

Gentlemen:

          We have examined the post-effective Amendment to the Registration
Statement File No. 33-34944 for the above-captioned trust. We hereby acknowledge
that Kenny S&P Evaluation Services, a division of J.J. Kenny Co., Inc. is
currently acting as the evaluator for the trust. We hereby consent to the use in
the Amendment of the reference to Kenny S&P Evaluation Services, a division of
J.J. Kenny Co., Inc. as evaluator.

         In addition, we hereby confirm that the ratings indicated in the
above-referenced Amendment to the Registratin Statement for the respective bonds
comprising the trust portfolio are the ratings indicated in our KENNYBASE
database.

         You are hereby authorized to file a copy of this letter with the
Securities and Exchange Commision.

                                   Sincerely,




                                   Frank A. Ciccotto



FAC/trh


<PAGE>
J.J. Kenny               Frank A. Ciccotto, Jr.
65 Broadway              Vice President
New York, NY 10006-2551  Tax-Exempt Evaluations
Tel 212 770 4422
Fax 212 797 8681

                                 Standard & Poor's
                                        A Division of The McGraw-Hill Companies




April 30, 1997


Reich & Tang Distributors L.P.
600 Fifth Avenue
New York, NY 10020

                      Re:     Insured Municipal Securities Trust,
                              New York Navigator Insured Series 6 and 
                              New Jersey Navigator Insured Series 3


Gentlemen:

          We have examined the post-effective Amendment to the Registration
Statement File No. 33-37849 for the above-captioned trust. We hereby acknowledge
that Kenny S&P Evaluation Services, a division of J.J. Kenny Co., Inc. is
currently acting as the evaluator for the trust. We hereby consent to the use in
the Amendment of the reference to Kenny S&P Evaluation Services, a division of
J.J. Kenny Co., Inc. as evaluator.

         In addition, we hereby confirm that the ratings indicated in the
above-referenced Amendment to the Registratin Statement for the respective bonds
comprising the trust portfolio are the ratings indicated in our KENNYBASE
database.

         You are hereby authorized to file a copy of this letter with the
Securities and Exchange Commision.

                                   Sincerely,




                                   Frank A. Ciccotto


FAC/trh

                              GRUNTAL & CO., L.L.C.


                             SECRETARY'S CERTIFICATE


                                       OF


                        EXECUTIVE COMMITTEE'S RESOLUTIONS



                  I, Joanne T. Marren, DO HEREBY CERTIFY, that I am the
Secretary of Gruntal & Co., L.L.C., a Delaware limited liability company (the
"Company"), and that I am the keeper of the records and seal thereof; that the
attached is a true, correct and compared copy of the resolutions duly adopted by
a unanimous consent of the Executive Committee of the Company on April 24, 1997,
and that the resolutions remain in full force and effect.

                  IN WITNESS WHEREOF, I have hereunto set my hand and affixed
the seal of the Company this 24th day of April, 1997.


                                            /s/ Joanne T. Marren
                                            Joanne T. Marren
                                            Secretary




(Seal)



C/M:  11939.0001 473040.1

<PAGE>


                                 WRITTEN CONSENT

                                     OF THE

                               EXECUTIVE COMMITTEE

                                       OF

                              GRUNTAL & CO., L.L.C.


                            ------------------------
                           Pursuant to Section 4.7(b)
                                     of the
                                Limited Liability
                                Company Agreement
                            of Gruntal & Co., L.L.C.
                            ------------------------


                  THE UNDERSIGNED, being all the directors of GRUNTAL & CO.,
L.L.C., a Delaware limited liability company (the "Company"), who would be
entitled to notice of a meeting for the purpose of taking the action and
adopting the resolutions set forth below, do hereby waive such notice, take the
following action, and adopt the following resolutions by written consent of the
Executive Committee in lieu of a meeting, pursuant to Section 4.7(b) of the
Limited Liability Company Agreement:

                  WHEREAS, the Company had previously entered into a Trust
Indenture and Agreement, dated June 12, 1989 (the "Indenture") by and among
Bear, Stearns & Co., Inc., United States Trust Company of New York, and Standard
and Poor's Corporation, pursuant to which certain series of Insured Municipal
Securities Trusts as set forth on Schedule A were created (the "Trusts"); and

C/M 11939.0001 473041.1

<PAGE>



                  WHEREAS, subsequently Reich & Tang Distributors L.P.
and Chase Manhattan Bank became the successors to the Unit
Investment Trust division of Bear Stearns & Co., Inc. and U.S.
Trust Company of New York, respectively.

                  NOW, THEREFORE, be it:

                  RESOLVED, that it is desirable and in the best interests of
                  the Company that a Power of Attorney be executed on behalf of
                  the Company appointing Reich & Tang Distributors L.P. as the
                  true and lawful agent and attorney-in-fact of the Company to
                  execute and deliver any and all documents required or
                  permitted to be executed or delivered under the terms of the
                  Indenture relating to such Trusts; and be it further

                  RESOLVED, that any officer of this Company and any person
                  authorized by the Executive Committee or by the President or
                  any Senior Executive Vice President or Executive Vice
                  President of this Company, or member of the Management
                  Committee,
                  including:

                                            Robert P. Rittereiser
                                            Lee Fensterstock
                                            Barry Richter
                                            Joanne T. Marren
                                            Stephen DiTursi
                                            Henry D. Gottmann
                                            Leopold Korins
                                            Joseph V. Battipaglia
                                            John Feeney
                                            John Cirrito
                                            Ralph H. Bradley, Jr.

                  (each of which being hereinafter referred to in these
                  resolutions as an "Authorized Person"), be, and each of them
                  hereby is, severally authorized on behalf of the Company to
                  prepare, execute, deliver and cause to be filed with the
                  Securities and Exchange Commission Registration Statements on
                  Form S-6, the Securities Act of 1933, as amended, or any
                  successor form or forms, amendments and post-effective
                  amendments to said Registration Statements and to take such
                  further action as may be necessary to cause said Registration
                  Statements to become and to remain effective under the
                  Securities Act of 1933, as amended, and to make

C/M 11939.0001 473041.1

<PAGE>



                  such changes therein and additions thereto as said Authorized
                  Person shall approve in connection with the issuance and sale
                  of units of undivided interests in connection with the unit
                  investment trusts of the Trusts, and that upon the proper
                  registration and qualification of a unit investment trust for
                  the Trusts, to effect a public offering of the units in the
                  manner and upon the terms and conditions set forth in the
                  Registration Statement and Prospectus relating to the units of
                  such Series; and be it further

                  RESOLVED, that any Authorized person be, and each of them is,
                  hereby severally authorized to take such further action and to
                  do any and all things necessary or proper under any applicable
                  law, including the Investment Company Act of 1940, the
                  Securities Act of 1933 and the Securities Exchange Act of
                  1934, including the submission and filing of any and all
                  applications, necessary or proper; and be it further

                  RESOLVED, that any Authorized Person of the Company be, and
                  each of them is, hereby severally authorized to effect a name
                  change in any Trust authorized by the foregoing resolutions
                  and to do all things necessary or proper to effect any such
                  name change; and be it further

                  RESOLVED, that any Authorized Person of the Company is hereby
                  authorized and directed to take such further action and to do
                  any and all things necessary or proper under said Trust
                  Indentures and Agreements in order to perform in all respects
                  the obligations and undertakings of the Company thereunder;
                  and be it further

                  RESOLVED, that it is desirable and in the best interests of
                  the Company that the securities of the Trusts be qualified or
                  registered for sale in various states and that such
                  registration or qualification be kept current and effective to
                  the extent necessary to accomplish the intent of the foregoing
                  resolutions; that any Authorized Person of the Company be, and
                  hereby is, authorized to determine the states in which
                  appropriate action shall be taken to qualify or register for
                  sale all or such part of the securities of the Trusts as said
                  Authorized Person may deem advisable; that said Authorized
                  Person is hereby authorized to perform on behalf of the
                  Company any and all such acts as he may deem necessary or
                  advisable in

C/M 11939.0001 473041.1

<PAGE>



                  order to comply with the applicable laws of any such states;
                  and in connection therewith to execute and file all requisite
                  papers and documents, including, but not limited to,
                  applications, reports, surety bonds, commitments,
                  undertakings, irrevocable consents and appointments of
                  attorneys for service of process; and the execution by such
                  Authorized Person of any such paper or document or the doing
                  by him of any act in connection with the foregoing matters
                  shall conclusively establish his authority therefor from the
                  Company and the approval and ratification by the Company of
                  the papers and documents so executed and the action so taken;
                  and be it further

                  RESOLVED, that the Company expressly assumes all duties and
                  obligations and accedes to all rights of the Sponsor under the
                  respective Trust Agreements and related Reference Trust
                  Agreements with respect to all Secondary Series; and be it
                  further

                  RESOLVED, that any Authorized Person of the Company hereby is
                  authorized to do and perform all such further acts and things
                  and execute and deliver for and on behalf of the Company all
                  such other documents, instruments and certificates as such
                  Authorized Person may deem necessary or proper to execute and
                  carry out the purpose and intent of the foregoing resolutions;
                  and be it further

                  RESOLVED, that each of such Authorized Persons is hereby
                  appointed agent and attorney-in-fact for the Company with full
                  power to sign on the Company's behalf Registration Statements
                  under the Securities Act of 1933, as amended, and the
                  Investment Company Act of 1940, as amended, and any and all
                  amendments thereto, and to execute and deliver such other
                  documents as may be necessary and proper to execute and carry
                  out the purpose and intent of the foregoing resolutions, and
                  the appropriate officers of the Company are authorized to
                  execute a Power of Attorney authorizing such appointment and
                  to certify and file with the Securities and Exchange
                  Commission a copy of these resolutions; and be it further

                  RESOLVED, that any action heretofore taken or omitted to be
                  taken by any Authorized Person of the Company in connection
                  with the Series or

C/M 11939.0001 473041.1

<PAGE>



                  Secondary Series be, and the same hereby is, approved and
                  ratified by the Company; and the execution by such Authorized
                  Person or other officer of the Company of any paper or
                  document or the doing by them of any act in connection with
                  the foregoing matters shall conclusively establish his
                  approval therefor from the Company and the approval and
                  ratification by the Company of the papers and documents so
                  executed and the action so taken; and be it further

                  RESOLVED, that the form, terms and provisions of the Powers of
                  Attorney in substantially the form attached hereto as Exhibits
                  A and B are hereby in all respects approved; and be it further

                  RESOLVED, that the officers of the Company are hereby
                  authorized to take such actions as they deem necessary or
                  proper to effectuate the foregoing resolutions.

                  IN WITNESS WHEREOF, each of the undersigned Directors has
executed this Written Consent of the Executive Committee on the 24th day of
April, 1997.

                                            /s/ Robert P. Rittereiser
                                            Robert P. Rittereiser


                                            /s/ Lee Fensterstock
                                            Lee Fensterstock


                                            /s/ Barry Richter
                                            Barry Richter


                                            /s/ Joanne T. Marren
                                            Joanne T. Marren


                                            /s/ Stephen DiTursi
                                            Stephen DiTursi


                                            /s/ Henry D. Gottmann
                                            Henry D. Gottmann


C/M 11939.0001 473041.1

<PAGE>



                                            /s/ Leopold Korins
                                            Leopold Korins


                                            /s/ Joseph V. Battipaglia
                                            Joseph V. Battipaglia


                                            /s/ John Feeney
                                            John Feeney


                                            /s/ John Cirrito
                                            John Cirrito


                                            /s/ Ralph H. Bradley, Jr.
                                            Ralph H. Bradley, Jr.


C/M 11939.0001 473041.1

<PAGE>


                                   Schedule A

- - Municipal Securities Trust, Series 45 and 73rd Discount Series 
- - Municipal Securities Trust, Series 46 and 74th Discount Series 
- - Municipal Securities Trust, Multi-State Series 39, Series 47 and 75th
         Discount Series
- -   Municipal Securities Trust, Series 48 and 76th Discount Series
- -   Municipal Securities Trust, Multi-State Series 40, Series 49 and 77th
         Discount Series
- - Municipal Securities Trust, Series 50 and 78th Discount Series 
- - Municipal Securities Trust, Series 51 and 79th Discount Series 
- - Municipal Securities Trust, Series 52, Multi-State Series 41 
- - Municipal Securities Trust, Series 53, Multi-State Series 42 
- - Municipal Securities Trust, Series 54, Multi-State Series 43 
- - Municipal Securities Trust, Series 55

- -   Municipal Securities Trust, Multi-State Series 37
- -   Municipal Securities Trust, Multi-State Series 38
- -   Municipal Securities Trust, Multi-State Series 44

- - Insured Municipal Securities Trust, 47th Discount Series and Series 20 
- - Insured Municipal Securities Trust, 48th Discount Series and Series 21 
- - Insured Municipal Securities Trust, Series 22 and New York Navigator
         Insured Series 1
- - Insured Municipal Securities Trust, 49th Discount Series, Series 23 and
         New York Navigator Insured Series 2
- - Insured Municipal Securities Trust, Series 24 and New York Navigator
         Insured Series 3
- - Insured Municipal Securities Trust, 50th Discount Series, New Jersey
         Navigator Insured Series 1 and Pennsylvania Navigator Insured Series 1
- - Insured Municipal Securities Trust, Series 25 and New York Navigator
         Insured Series 4
- - Insured Municipal Securities Trust, New York Navigator Insured Series 5
         and New Jersey Navigator Insured Series 2
- - Insured Municipal Securities Trust, Series 26, New York Navigator Insured
         Series 6 and New Jersey Navigator Insured Series 3
- - Insured Municipal Securities Trust, New York Navigator Insured Series 7
         and New Jersey Navigator Insured Series 4
- - Insured Municipal Securities Trust, New York Navigator Insured Series 8
         and New Jersey Navigator Insured Series 5
- - Insured Municipal Securities Trust, Series 27, New York Navigator Insured
         Series 9, and New Jersey Navigator Insured Series 6
- - Insured Municipal Securities Trust, Series 28, New York Navigator Insured
         Series 10, and New Jersey Navigator Insured Series 7
- - Insured Municipal Securities Trust, Series 29, New York Navigator Insured
         Series 11, and New Jersey Navigator Insured Series 8
- - Insured Municipal Securities Trust, Series 30, and New York Navigator
         Insured Series 12
- - Insured Municipal Securities Trust, New York Navigator Insured Series 13
         and New Jersey Navigator Insured Series 9
- - Insured Municipal Securities Trust, Series 31, New York Navigator Insured
         Series 14, and New Jersey Navigator Insured Series 10
- - Insured Municipal Securities Trust, New York Navigator Insured Series 15
         and New Jersey Navigator Insured Series 11
- - Insured Municipal Securities Trust, New York Navigator Insured Series 16
         and New Jersey Navigator Insured Series 12

C/M:  11939.0001 473674.1

<PAGE>


- - Insured Municipal Securities Trust, New York Navigator Insured Series 17
         and New Jersey Navigator Insured Series 13

- - Municipal Securities Trust, Short-Intermediate Series 2

- - Mortgage Securities Trust, CMO Series 1
- - Mortgage Securities Trust, CMO Series 2
- - Mortgage Securities Trust, CMO Series 3
- - Mortgage Securities Trust, CMO Series 4
- - Mortgage Securities Trust, CMO Series 5
- - Mortgage Securities Trust, CMO Series 6
- - Mortgage Securities Trust, CMO Series 7
- - Mortgage Securities Trust, CMO Series 8
- - Mortgage Securities Trust, CMO Series 9
- - Mortgage Securities Trust, CMO Series 10

- - Equity Securities Trust, Series 1, Gabelli Communications Income Trust

C/M:  11939.0001 473674.1
                                       -2-

<PAGE>


                                POWER OF ATTORNEY


                  KNOW ALL MEN BY THESE PRESENTS that Gruntal & Co., L.L.C., a
Delaware limited liability company (the "Sponsor"), and each of the undersigned
officers and directors of the Sponsor, hereby constitutes and appoints Robert P.
Rittereiser, Lee Fensterstock, Barry Richter, Joanne T. Marren, Stephen DiTursi,
Henry D. Gottmann, Leopold Korins, Joseph V. Battipaglia, John Feeney, John
Cirrito and Ralph H. Bradley, Jr. jointly and severally, his or its
attorneys-in-fact, each with the power of substitution for him or it in any and
all capacities, to sign on his or its behalf and in his or its name and to file
with the Securities and Exchange Commission a registration statement on Form S-6
under the Securities Act of 1933, as amended, or any successor form or forms,
and the rules and regulations promulgated thereunder, and any and all amendments
thereto, exhibits and other appropriate documents in connection therewith,
relating to the registration and issuance of units of certain series of unit
investment trusts as listed on Schedule A, and hereby grants unto each of said
attorneys-in-fact full power and authority to do and perform each and every
lawful act and deed necessary to effectuate such registration statements, and to
maintain the effectiveness of registration statements for such unit investment
trusts, that each or any of them may lawfully do or cause to be done.

                  IN WITNESS WHEREOF, the Sponsor has caused this power of
attorney to be executed in its name by its Chief Executive Officer, and the
undersigned directors and officers have hereunto set their hands and seals this
24th day of April, 1997.


                                            (Sponsor)
                                            GRUNTAL & CO., L.L.C.


                                            By:/s/ Robert P. Rittereiser
                                               Robert P. Rittereiser
                                               (Chief Executive Officer)

                                            (At least a majority of Board
                                            Members must also sign)


                                            /s/ Robert P. Rittereiser
                                            Robert P. Rittereiser
                                            (Director)

                                            /s/ Barry Richter
                                            Barry Richter
                                            (Director and Vice Chairman)



C/M 11939.0001 473035.1

<PAGE>


                                            /s/ Lee Fensterstock
                                            Lee Fensterstock
                                            (Director and President)


                                            /s/ Joanne T. Marren
                                            Joanne T. Marren
                                            (Director, Executive Vice
                                            President and General Counsel)


                                            /s/ Stephen DiTursi
                                            Stephen DiTursi
                                            (Director and Executive Vice
                                            President)


                                            /s/ Henry D. Gottmann
                                            Henry D. Gottmann
                                            (Director and Executive Vice
                                            President)


                                            /s/ Leopold Korins
                                            Leopold Korins
                                            (Director)


                                            /s/ Joseph V. Battipaglia
                                            Joseph V. Battipaglia
                                            (Director and Executive Vice
                                            President)


                                            /s/ John Feeney
                                            John Feeney
                                            (Director and President of
                                            GMS)


                                            /s/ John Cirrito
                                            John Cirrito
                                            (Director and Executive Vice
                                            President)


                                            /s/ Ralph H. Bradley, Jr.
                                            Ralph H. Bradley, Jr.
                                            (Director and Executive Vice
                                            President)

C/M 11939.0001 473035.1

<PAGE>


                                   Schedule A

- - Municipal Securities Trust, Series 45 and 73rd Discount Series 
- - Municipal Securities Trust, Series 46 and 74th Discount Series 
- - Municipal Securities Trust, Multi-State Series 39, Series 47 and 75th
         Discount Series
- -   Municipal Securities Trust, Series 48 and 76th Discount Series
- -   Municipal Securities Trust, Multi-State Series 40, Series 49 and 77th
         Discount Series
- - Municipal Securities Trust, Series 50 and 78th Discount Series 
- - Municipal Securities Trust, Series 51 and 79th Discount Series 
- - Municipal Securities Trust, Series 52, Multi-State Series 41 
- - Municipal Securities Trust, Series 53, Multi-State Series 42 
- - Municipal Securities Trust, Series 54, Multi-State Series 43 
- - Municipal Securities Trust, Series 55

- -   Municipal Securities Trust, Multi-State Series 37
- -   Municipal Securities Trust, Multi-State Series 38
- -   Municipal Securities Trust, Multi-State Series 44

- - Insured Municipal Securities Trust, 47th Discount Series and Series 20 
- - Insured Municipal Securities Trust, 48th Discount Series and Series 21 
- - Insured Municipal Securities Trust, Series 22 and New York Navigator
         Insured Series 1
- - Insured Municipal Securities Trust, 49th Discount Series, Series 23 and
         New York Navigator Insured Series 2
- - Insured Municipal Securities Trust, Series 24 and New York Navigator
         Insured Series 3
- - Insured Municipal Securities Trust, 50th Discount Series, New Jersey
         Navigator Insured Series 1 and Pennsylvania Navigator Insured Series 1
- - Insured Municipal Securities Trust, Series 25 and New York Navigator
         Insured Series 4
- - Insured Municipal Securities Trust, New York Navigator Insured Series 5
         and New Jersey Navigator Insured Series 2
- - Insured Municipal Securities Trust, Series 26, New York Navigator Insured
         Series 6 and New Jersey Navigator Insured Series 3
- - Insured Municipal Securities Trust, New York Navigator Insured Series 7
         and New Jersey Navigator Insured Series 4
- - Insured Municipal Securities Trust, New York Navigator Insured Series 8
         and New Jersey Navigator Insured Series 5
- - Insured Municipal Securities Trust, Series 27, New York Navigator Insured
         Series 9, and New Jersey Navigator Insured Series 6
- - Insured Municipal Securities Trust, Series 28, New York Navigator Insured
         Series 10, and New Jersey Navigator Insured Series 7
- - Insured Municipal Securities Trust, Series 29, New York Navigator Insured
         Series 11, and New Jersey Navigator Insured Series 8
- - Insured Municipal Securities Trust, Series 30, and New York Navigator
         Insured Series 12
- - Insured Municipal Securities Trust, New York Navigator Insured Series 13
         and New Jersey Navigator Insured Series 9
- - Insured Municipal Securities Trust, Series 31, New York Navigator Insured
         Series 14, and New Jersey Navigator Insured Series 10
- - Insured Municipal Securities Trust, New York Navigator Insured Series 15
         and New Jersey Navigator Insured Series 11
- - Insured Municipal Securities Trust, New York Navigator Insured Series 16
         and New Jersey Navigator Insured Series 12

C/M:  11939.0001 473674.1

<PAGE>


- - Insured Municipal Securities Trust, New York Navigator Insured Series 17
         and New Jersey Navigator Insured Series 13

- - Municipal Securities Trust, Short-Intermediate Series 2

- - Mortgage Securities Trust, CMO Series 1
- - Mortgage Securities Trust, CMO Series 2
- - Mortgage Securities Trust, CMO Series 3
- - Mortgage Securities Trust, CMO Series 4
- - Mortgage Securities Trust, CMO Series 5
- - Mortgage Securities Trust, CMO Series 6
- - Mortgage Securities Trust, CMO Series 7
- - Mortgage Securities Trust, CMO Series 8
- - Mortgage Securities Trust, CMO Series 9
- - Mortgage Securities Trust, CMO Series 10

- - Equity Securities Trust, Series 1, Gabelli Communications Income Trust

C/M:  11939.0001 473674.1
                                       -2-
<PAGE>


                                POWER OF ATTORNEY


                  KNOW ALL MEN BY THESE PRESENTS, That the undersigned hereby
constitutes and appoints Reich & Tang Distributors L.P. ("Reich & Tang")
(successor to the Unit Investment Trust division of Bear, Stearns & Co., Inc.)
as the true and lawful agent and attorney-in-fact of the undersigned, with power
and authority to execute and deliver, in such form as Reich & Tang may
determine, any and all notices, opinions, certificates, lists, demands,
directions, instruments or other documents required or permitted to be executed
or delivered by the Depositors under the terms of that certain Trust Indenture
and Agreement dated June 16, 1989 (the "Indenture"), creating certain trusts of
Insured Municipal Securities Trust as listed on Schedule A, by and among Bear
Stearns & Co., Inc., Gruntal & Co., L.L.C. (as Depositors), the United States
Trust Company of New York (as Trustee) and Standard & Poor's Corporation (as
Evaluator), and all other related agreements or documents and any documents or
filings necessary to register and to maintain the registration of such Trusts
with the various state or "Blue Sky" authorities, and all other agreements or
documents necessary or reasonably deemed by Reich & Tang to be advisable to be
executed or delivered on behalf of the Depositors.

                  The undersigned hereby further constitutes and appoints Reich
& Tang as the true and lawful agent and attorney-in-fact of the undersigned to
receive, on behalf of the undersigned as a Depositor of any Trust created
pursuant to the Indenture, all notices, opinions, certificates, lists, demands,
directions, instruments or other documents to be provided to the Depositor under
the Indenture.

                  This Power of Attorney shall remain valid and in full force
and effect until revoked by a writing delivered to the Trustee.

                  WITNESS the due execution hereof at New York, New York this
24th day of April, 1997.



                                            GRUNTAL & CO., L.L.C.



                                            By:  /s/ Joanne T. Marren
                                                 Name:  Joanne T. Marren
                                                 Title: Secretary



C/M 11939.0001 473037.1

<PAGE>


                                   Schedule A

- - Municipal Securities Trust, Series 45 and 73rd Discount Series 
- - Municipal Securities Trust, Series 46 and 74th Discount Series 
- - Municipal Securities Trust, Multi-State Series 39, Series 47 and 75th
         Discount Series
- -   Municipal Securities Trust, Series 48 and 76th Discount Series
- -   Municipal Securities Trust, Multi-State Series 40, Series 49 and 77th
         Discount Series
- - Municipal Securities Trust, Series 50 and 78th Discount Series 
- - Municipal Securities Trust, Series 51 and 79th Discount Series 
- - Municipal Securities Trust, Series 52, Multi-State Series 41 
- - Municipal Securities Trust, Series 53, Multi-State Series 42 
- - Municipal Securities Trust, Series 54, Multi-State Series 43 
- - Municipal Securities Trust, Series 55

- -   Municipal Securities Trust, Multi-State Series 37
- -   Municipal Securities Trust, Multi-State Series 38
- -   Municipal Securities Trust, Multi-State Series 44

- - Insured Municipal Securities Trust, 47th Discount Series and Series 20 
- - Insured Municipal Securities Trust, 48th Discount Series and Series 21 
- - Insured Municipal Securities Trust, Series 22 and New York Navigator
         Insured Series 1
- - Insured Municipal Securities Trust, 49th Discount Series, Series 23 and
         New York Navigator Insured Series 2
- - Insured Municipal Securities Trust, Series 24 and New York Navigator
         Insured Series 3
- - Insured Municipal Securities Trust, 50th Discount Series, New Jersey
         Navigator Insured Series 1 and Pennsylvania Navigator Insured Series 1
- - Insured Municipal Securities Trust, Series 25 and New York Navigator
         Insured Series 4
- - Insured Municipal Securities Trust, New York Navigator Insured Series 5
         and New Jersey Navigator Insured Series 2
- - Insured Municipal Securities Trust, Series 26, New York Navigator Insured
         Series 6 and New Jersey Navigator Insured Series 3
- - Insured Municipal Securities Trust, New York Navigator Insured Series 7
         and New Jersey Navigator Insured Series 4
- - Insured Municipal Securities Trust, New York Navigator Insured Series 8
         and New Jersey Navigator Insured Series 5
- - Insured Municipal Securities Trust, Series 27, New York Navigator Insured
         Series 9, and New Jersey Navigator Insured Series 6
- - Insured Municipal Securities Trust, Series 28, New York Navigator Insured
         Series 10, and New Jersey Navigator Insured Series 7
- - Insured Municipal Securities Trust, Series 29, New York Navigator Insured
         Series 11, and New Jersey Navigator Insured Series 8
- - Insured Municipal Securities Trust, Series 30, and New York Navigator
         Insured Series 12
- - Insured Municipal Securities Trust, New York Navigator Insured Series 13
         and New Jersey Navigator Insured Series 9
- - Insured Municipal Securities Trust, Series 31, New York Navigator Insured
         Series 14, and New Jersey Navigator Insured Series 10
- - Insured Municipal Securities Trust, New York Navigator Insured Series 15
         and New Jersey Navigator Insured Series 11
- - Insured Municipal Securities Trust, New York Navigator Insured Series 16
         and New Jersey Navigator Insured Series 12

C/M:  11939.0001 473674.1

<PAGE>


- - Insured Municipal Securities Trust, New York Navigator Insured Series 17
         and New Jersey Navigator Insured Series 13

- - Municipal Securities Trust, Short-Intermediate Series 2

- - Mortgage Securities Trust, CMO Series 1
- - Mortgage Securities Trust, CMO Series 2
- - Mortgage Securities Trust, CMO Series 3
- - Mortgage Securities Trust, CMO Series 4
- - Mortgage Securities Trust, CMO Series 5
- - Mortgage Securities Trust, CMO Series 6
- - Mortgage Securities Trust, CMO Series 7
- - Mortgage Securities Trust, CMO Series 8
- - Mortgage Securities Trust, CMO Series 9
- - Mortgage Securities Trust, CMO Series 10

- - Equity Securities Trust, Series 1, Gabelli Communications Income Trust

C/M:  11939.0001 473674.1
                                       -2-


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