NUVEEN TAX EXEMPT UNIT TRUST SERIES 786
487, 1995-02-23
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<PAGE>


                                                      File No. 33-57383
                                                      40 Act File No. 811-2271


                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549

                                AMENDMENT NO. 1
                                       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:     NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 786

B.  Name of Depositor:       JOHN NUVEEN & CO. INCORPORATED

C.  Complete address of Depositor's principal executive offices:

                             333 West Wacker Drive
                             Chicago, Illinois  60606

D.  Name and complete address of agents for service:

                             JOHN NUVEEN & CO. INCORPORATED
                             Attn:  James J. Wesolowski
                             333 West Wacker Drive
                             Chicago, Illinois 60606

                             CHAPMAN AND CUTLER
                             Attn:  Daniel C. Bird, Jr.
                             111 West Monroe Street
                             Chicago, Illinois  60603

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

- -----
- -----    immediately upon filing pursuant to paragraph (b)

- -----
- -----    on (date) pursuant to paragraph (b)

- -----
- -----    60 days after filing pursuant to paragraph (a)

- -----
- -----    on (date) pursuant to paragraph (a) of rule 485 or 486

E.  Title and amount of securities being registered:  An indefinite number of
    Units as permitted by Rule 24f-2.

F.  Proposed maximum offering price to the public of the securities being
    registered:  Not presently determinable.

G.  Amount of filing fee:  $500 in accordance with Rule 24f-2.

H.  Approximate date of proposed sale to the public:

    As soon as practicable after the effective date of the Registration
    Statement.
______
          Check box if it is proposed that this filing will become effective
  X       on 2/23/95 at 1:30 p.m. pursuant to Rule 487.
______



<PAGE>
   
                               FEBRUARY 23, 1995
                             SUBJECT TO COMPLETION
 
NUVEEN  Tax-Exempt Unit Trusts
             PROSPECTUS
            Series 786
             February 23, 1995
    
INTEREST  INCOME TO THE  TRUSTS AND TO  UNITHOLDERS, IN THE  OPINION OF COUNSEL,
UNDER EXISTING LAW IS EXEMPT FROM FEDERAL INCOME TAX. CAPITAL GAINS, IF ANY, ARE
SUBJECT TO TAX. IN ADDITION, INTEREST INCOME OF STATE TRUSTS IS, IN THE  OPINION
OF  COUNSEL,  EXEMPT,  TO THE  EXTENT  INDICATED,  FROM STATE  AND  LOCAL TAXES.
INTEREST INCOME OF ANY TRUST  OTHER THAN A STATE TRUST  MAY BE SUBJECT TO  STATE
AND LOCAL TAXES.
 
CURRENTLY  OFFERED AT PUBLIC OFFERING PRICE PLUS INTEREST ACCRUED TO THE DATE OF
SETTLEMENT. MINIMUM PURCHASE--EITHER $5,000 OR 50 UNITS, WHICHEVER IS LESS.
 
   
THE NUVEEN  TAX-EXEMPT  UNIT TRUST,  SERIES  786 consists  of  three  underlying
separate  unit investment trusts  designated as Maryland  Traditional Trust 304,
National Insured  Trust  291  and  California  Insured  Trust  243.  Each  Trust
initially  consists  of delivery  statements relating  to contracts  to purchase
Bonds and, thereafter, will  consist of a  diversified portfolio of  obligations
issued  by  or on  behalf of  states and  territories of  the United  States and
authorities and political subdivisions  thereof (see SCHEDULES OF  INVESTMENTS),
the  interest on which is, in the opinion of bond counsel to the issuers, exempt
from Federal income tax under existing  law. In addition, the interest on  Bonds
in  each State Trust  is, in the opinion  of bond counsel to  the issuers of the
obligations, exempt from such State's income  taxes, if any. All obligations  in
each  Traditional Trust are  rated in the  category "A" or  better by Standard &
Poor's Corporation or Moody's  Investors Service, Inc. on  the Date of  Deposit.
All  obligations  in each  Insured Trust  are covered  by policies  of insurance
obtained from the  Municipal Bond Investors  Assurance Corporation  guaranteeing
payment  of  principal and  interest when  due. All  such policies  of insurance
remain effective so long as the obligations are outstanding. As a result of such
insurance, the Bonds  in each portfolio  of the Insured  Trusts have received  a
rating  of "Aaa" by Moody's Investors Service, Inc. and the Bonds in the Insured
Trusts and the  Units of  each such  Trust have received  a rating  of "AAA"  by
Standard  &  Poor's Corporation.  INSURANCE  RELATES ONLY  TO  THE BONDS  IN THE
INSURED TRUSTS AND NOT  TO THE UNITS  OFFERED HEREBY OR  TO THEIR MARKET  VALUE.
(See Section 5.)
    
 
THE  OBJECTIVES of the Trusts are  tax-exempt income and conservation of capital
through a diversified  investment in tax-exempt  Bonds. (SEE SECTIONS  2, 3  AND
11.)  The payment of interest and the  preservation of principal are, of course,
dependent upon the continuing ability of the issuers of Bonds and of any insurer
thereof to meet  their obligations thereunder.  There is no  guarantee that  the
Trusts' objectives will be achieved. (SEE PAGE A-1.)
 
DISTRIBUTIONS  of interest  received by  each Trust  will be  made semi-annually
unless the Unitholder elects to receive them monthly or quarterly. (SEE  SECTION
13.)  Distribution of funds in the Principal Account, if any, will ordinarily be
made semi-annually.
 
FOR ESTIMATED LONG TERM RETURNS AND ESTIMATED CURRENT RETURNS to Unitholders  in
each  Trust on the  business day prior to  the Date of Deposit.  (SEE PAGE 3 AND
SECTION 9.)
THE PUBLIC OFFERING  PRICE per Unit  of each Trust  during the initial  offering
period  is equal to a pro rata share of the OFFERING prices of the Bonds in such
Trust's portfolio plus  a sales charge  of up  to 4.90% of  the Public  Offering
Price  (equivalent to 5.152%  of the net  amount invested); the  sales charge is
somewhat lower on Trusts  with lesser average maturities.  (SEE SECTION 6.)  The
Secondary  Market Public Offering Price per Unit for each Trust will be equal to
a pro rata share of the  sum of BID prices of the  Bonds in such Trust plus  the
sales  charges determined based on the number of years remaining to the maturity
of each  Bond. Accrued  interest from  the  preceding Record  Date to,  but  not
including,  the settlement date (normally five  business days after purchase) is
added to the Public Offering Price. The  sales charge is reduced on a  graduated
scale  for sales involving at least $50,000 or  500 Units and will be applied on
whichever basis is more favorable to the purchaser. (SEE SECTION 6.)
 
A UNITHOLDER MAY REDEEM UNITS at the office of the Trustee, United States  Trust
Company of New York, at prices based upon the BID prices of the Bonds. The price
received  upon  redemption  may  be  more  or  less  than  the  amount  paid  by
Unitholders, depending upon the  value of the  Bonds on the  date of tender  for
redemption.  (SEE  SECTION 19.)  The Sponsor,  although not  required to  do so,
intends to make a secondary market for  the Units of the Trusts at prices  based
upon  the BID  prices of the  Bonds in  the respective Trusts.  (SEE SECTION 7.)
RETAIN THIS PROSPECTUS FOR FUTURE REFERENCE.
 
UNITS OF THE TRUST ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK AND ARE NOT FEDERALLY INSURED OR OTHERWISE PROTECTED BY THE FEDERAL
DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY AND
INVOLVE INVESTMENT RISK, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.
 
THESE SECURITIES HAVE  NOT BEEN APPROVED  OR DISAPPROVED BY  THE SECURITIES  AND
EXCHANGE  COMMISSION OR ANY  STATE SECURITIES COMMISSION  NOR HAS THE SECURITIES
AND EXCHANGE  COMMISSION OR  ANY  STATE SECURITIES  COMMISSION PASSED  UPON  THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
<PAGE>
  NUVEEN  Tax-Exempt Unit Trusts
 
<TABLE>
<CAPTION>
      INDEX                                             SECTION         PAGE
<C>   <S>                                              <C>        <C>
      SPECIFIC TRUST MATTERS
      Maryland Traditional Trust 304                          3         8-14
      National Insured Trust 291                              3        15-18
      California Insured Trust 243                            3        19-32
      GENERAL MATTERS
      Accrued Interest                                        8         A-17
      Accumulation Plan                                      14         A-25
      Bonds, How Selected                                     3            7
      Bonds, Initial Determination of Offering Price         10         A-19
      Bonds, Limited Right of Substitution                    4          A-7
      Bond Ratings                                            3         8-32
      Bonds, Removal from Trust                              21         A-34
      Call Provisions of Portfolio Bonds                   3, 4     8-32,A-8
      Capital Gains Taxability                               11         A-19
      Dealer Discount                                        17         A-29
      Description of Units of Trust                           1            5
      Distributions to Unitholders                           13         A-23
      Distribution Payment Dates                          3, 13   8-32, A-23
      Distribution of Units to the Public                    17         A-29
      Essential Information Regarding the Trusts             --            4
      Estimated Long Term Return and Estimated Current
      Return                                                  9      3, A-18
      Evaluation                                             16         A-28
      Expenses to Fund                                       12         A-22
      Insurance on Bonds in the Insured Trusts                5         A-10
      Insurance on Certain Bonds in the Traditional
      Trusts                                                  5         A-12
      Interest Income to Trust                                3         8-32
      Investments, Schedules of                               3         8-32
      Legality of Units                                      24         A-37
      Limitations on Liabilities of Sponsor and Trustee       22        A-34
      Market for Units                                        7         A-16
      Minimum Transaction                                    17         A-29
      Objectives of the Trusts                                2            6
      Optional Distribution Plan                             13         A-23
      Other Information                                      24         A-37
      Ownership and Transfer of Units                        18         A-30
      Public Offering Price of Units                          6         A-13
      Quantity Purchases                                      6         A-13
      Record Dates                                           13         A-23
      Ratings, Description of                                24         A-39
      Redemption of Units by Trustee                         19         A-31
      Reports to Unitholders                                 15         A-28
      Repurchase of Units by Sponsor                         20         A-33
      Risk Factors                                            3          A-1
      Sales Charge                                            6         A-13
      Sponsor, Information About                             23         A-35
      State Tax Status                                        3         8-32
      Successor Trustees and Sponsors                        22         A-34
      Tax Status of Unitholders                              11         A-19
      Trustee, Information About                             22         A-34
      Trust Indenture, Amendment and Termination             24         A-37
      Unit Value                                             16         A-28
</TABLE>
 
                  2
<PAGE>
                          ESTIMATED LONG TERM RETURNS
                                      AND
                    ESTIMATED CURRENT RETURNS FOR THE TRUSTS
 
Following  are the  Estimated Long Term  and Estimated Current  Returns for each
Trust on the  business day  prior to  the Date  of Deposit,  under the  monthly,
quarterly and semi-annual plans of distribution (SEE SECTION 3):
 
                          ESTIMATED LONG TERM RETURNS
 
<TABLE>
<CAPTION>
                                                          PLAN OF DISTRIBUTION
                                                ----------------------------------------
                    TRUST                       MONTHLY      QUARTERLY      SEMI-ANNUAL
  <S>                                           <C>          <C>            <C>
  --------------------------------------------------------------------------------------
  Maryland Traditional Trust 304...........      5.63%         5.66%           5.68%
  National Insured Trust 291...............      5.75%         5.78%           5.80%
  California Insured Trust 243.............      5.65%         5.68%           5.70%
</TABLE>
 
                           ESTIMATED CURRENT RETURNS
 
<TABLE>
<CAPTION>
                                                          PLAN OF DISTRIBUTION
                                                ----------------------------------------
                    TRUST                       MONTHLY      QUARTERLY      SEMI-ANNUAL
  <S>                                           <C>          <C>            <C>
  --------------------------------------------------------------------------------------
  Maryland Traditional Trust 304...........      5.52%         5.55%           5.57%
  National Insured Trust 291...............      5.68%         5.71%           5.73%
  California Insured Trust 243.............      5.59%         5.62%           5.64%
</TABLE>
 
    The  Estimated Long Term Return for each Trust is a measure of the return to
the investor earned  over the estimated  life of the  Trust. The Estimated  Long
Term  Return represents an  average of the  yields to maturity  (or call) of the
Bonds in  the Trust's  portfolio  calculated in  accordance with  accepted  bond
practice and adjusted to reflect expenses and sales charges. Under accepted bond
practice,  tax-exempt bonds  are customarily  offered to  investors on  a "yield
price" basis, which involves computation of  yield to maturity or to an  earlier
call date (whichever produces the lower yield), and which takes into account not
only the interest payable on the bonds but also the amortization or accretion to
a  specified date of any premium over  or discount from the par (maturity) value
in the bond's  purchase price. In  calculating Estimated Long  Term Return,  the
average  yield for  the Trust's  portfolio is  derived by  weighting 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. Once the average portfolio yield is  computed,
this  figure is then reduced to reflect estimated expenses and the effect of the
maximum sales  charge paid  by investors.  The Estimated  Long Term  Return  and
Estimated  Current Return calculations do not take  into account the effect of a
first distribution which may be less than a regular distribution or may be  paid
at  some point after 30 days (or a  second distribution which may be less than a
normal distribution for Unitholders who choose quarterly or semi-annual plans of
distribution), and it also does not  take into account the difference in  timing
of  payments  to  Unitholders  who  choose  quarterly  or  semi-annual  plans of
distribution, each of which will reduce the return.
 
    Estimated Current Return  is computed  by dividing the  Net Annual  Interest
Income per Unit by the Public Offering Price. In contrast to Estimated Long Term
Return, Estimated Current Return does not reflect the amortization of premium or
accretion of discount, if any, on the Bonds in the Trust's portfolio. Net Annual
Interest Income per Unit is calculated by dividing the annual interest income to
the Trust, less estimated expenses, by the number of Units outstanding.
 
    Net  Annual Interest  Income per Unit,  used to  calculate Estimated Current
Return, will vary  with changes  in fees  and expenses  of the  Trustee and  the
Evaluator  and with the redemption, maturity, exchange or sale of Bonds. A Trust
may experience expenses and  portfolio changes different  from those assumed  in
the  calculation of Estimated Long  Term Return. There thus  can be no assurance
that the Estimated  Current Returns or  the Estimated Long  Term Returns  quoted
herein will be realized in the future. Both the Estimated Current Return and the
Estimated  Long Term Return quoted  herein are based on  the market value of the
underlying Bonds on the  business day prior to  the Date of Deposit;  subsequent
calculations  of these performance measures will reflect the then current market
value of the underlying Bonds and may be higher or lower. For more  information,
see Section 9. The Sponsor will provide estimated cash flow information relating
to  a Trust without  charge to each  potential investor in  a Trust who receives
this prospectus and makes  an oral or  written request to  the Sponsor for  such
information.
 
                                       3
<PAGE>
   
                 ESSENTIAL INFORMATION REGARDING THE TRUSTS ON
                               FEBRUARY 22, 1995+
    
           Sponsor and Evaluator...... John Nuveen & Co. Incorporated
           Trustee........... United States Trust Company of New York
                  -------------------------------------------
 
The  income, expense and distribution data  set forth below have been calculated
for  Unitholders   receiving   MONTHLY   distributions.   Unitholders   choosing
distributions  quarterly or  semi-annually will receive  slightly higher returns
because of the lower Trustee's fees and expenses under such plans. (SEE  SECTION
3 FOR DATA RELATING TO THESE PLANS.)
 
<TABLE>
<CAPTION>
                                                       MARYLAND            NATIONAL           CALIFORNIA
                                                      TRADITIONAL           INSURED             INSURED
                                                       TRUST 304           TRUST 291           TRUST 243
<S>                                                 <C>                 <C>                 <C>
                                                    ---------------     ---------------     ---------------
Principal Amount of Bonds in Trust................  $    3,500,000      $   10,000,000      $    4,000,000
Number of Units...................................          35,000             100,000              40,000
Fractional Undivided Interest in Trust Per Unit...        1/35,000           1/100,000            1/40,000
Public Offering Price--Less than 500 Units
    Aggregate Offering Price of Bonds in Trust....  $    3,304,615      $    9,680,204      $    3,823,825
    Divided by Number of Units....................  $        94.42      $        96.80      $        95.60
    Plus Sales Charge*............................  $         4.86      $         4.99      $         4.93
    Public Offering Price Per Unit(1).............  $        99.28      $       101.79      $       100.53
Redemption Price Per Unit (exclusive of accrued
  interest).......................................  $        93.94      $        96.32      $        95.12
Sponsor's Initial Repurchase Price Per Unit
  (exclusive of accrued interest).................  $        94.42      $        96.80      $        95.60
Excess of Public Offering Price Per Unit over
  Redemption Price Per Unit.......................  $         5.34      $         5.47      $         5.41
Excess of Public Offering Price Per Unit over
  Sponsor's Repurchase Price Per Unit.............  $         4.86      $         4.99      $         4.93
Calculation of Estimated Net Annual Interest
  Income Per Unit
    Annual Interest Income(2).....................  $       5.6929      $       5.9851      $       5.8463
    Less Estimated Annual Expense.................  $        .2127      $        .2074      $        .2258
                                                    ---------------     ---------------     ---------------
    Estimated Net Annual Interest Income(3).......  $       5.4802      $       5.7777      $       5.6205
Daily Rate of Accrual Per Unit....................  $       .01522      $       .01604      $       .01561
Estimated Current Return(4).......................           5.52%               5.68%               5.59%
Estimated Long Term Return(4).....................           5.63%               5.75%               5.65%
 
<FN>
- ----------
Evaluations  for purpose of sale,  purchase or redemption of  Units are made as of  4 p.m. Eastern time  on the business day next
following receipt of an order by the Sponsor or Trustee. (See Section 6.)
 + The business day prior to the Date of Deposit.
 * National and State, 5.152%;  Long Intermediate, 4.439%; Intermediate, 4.058%;  Short Intermediate, 3.093%; Short Term,  2.564%
   (4.9%, 4.25%, 3.9%, 3.0% and 2.5% of the Public Offering Prices, respectively.)
(1)  Units are offered at the Public  Offering Price plus accrued interest from the  preceding Record Date to, but not including,
    the date of settlement (normally five business days after purchase).  The Date of Deposit of the Fund has been designated  as
    the  First Record  Date for all  plans of distribution  of the Trusts  and, accordingly, for  Units purchased on  the Date of
    Deposit, the following  amounts of accrued  interest to  the Settlement Date  will be  added to the  Public Offering  Prices:
    Maryland Traditional Trust--$.14, National Insured Trust--$.14 and California Insured Trust--$.14. (See Section 8.)
(2)  Assumes delivery of  all Bonds. (See Section  4.) Interest income does  not include accretion of  original issue discount on
    "zero coupon" Bonds, Stripped Obligations or other original issue discount Bonds. (See "General Trust Information" in Section
    3.)
(3) The amount and timing of interest distributions from each Trust under the various plans of distribution are shown in  Section
    3.
(4)  Estimated Long Term Return  for each Trust represents  the average of the yields  to maturity (or call)  of the Bonds in the
    Trust's portfolio calculated in accordance with accepted bond  practices and adjusted to reflect expenses and sales  charges.
    Estimated Current Return is computed by dividing the Net Annual Interest Income per Unit by the Public Offering Price, and in
    contrast  to Estimated Long Term  Return does not reflect the  amortization of premium or accretion  of discount, if any. For
    more information see page 3 and Section 9.
</TABLE>
 
                                       4
<PAGE>
                   ESSENTIAL INFORMATION REGARDING THE TRUSTS
                                  (CONTINUED)
 
<TABLE>
<S>                                         <C>
Record Dates............................................................See Section 13
Distribution Dates......................................................See Section 13
Minimum Principal Distribution..........................................$0.10 Per Unit
Date Trusts Established..............................................February 23, 1995
Settlement Date..........................................................March 2, 1995
Mandatory Termination Date..............................................See Section 24
Minimum Value of Each Trust.............................................See Section 24
Sponsor's Annual Evaluation Fee.............$0.17 per $1,000 principal amount of Bonds
Trustee's Annual Fees:
</TABLE>
 
<TABLE>
<CAPTION>
                                                             PLAN OF DISTRIBUTION
                                                ----------------------------------------------
                    TRUST                         MONTHLY         QUARTERLY       SEMI-ANNUAL
  -----------------------------------------     ------------     ------------     ------------
  <S>                                           <C>              <C>              <C>
  Maryland Traditional Trust 304...........          $1.5523          $1.2323         $1.0423
  National Insured Trust 291...............           1.6487           1.3287          1.1387
  California Insured Trust 243.............           1.7127           1.3927          1.2027
  ------------
  * Each Trustee annual fee is per $1,000 principal amount of the underlying Bonds in a  Trust
    for that portion of the Trust that represents a particular plan of distribution.
</TABLE>
 
CUSIP Numbers:
 
<TABLE>
<CAPTION>
                    TRUST                         MONTHLY         QUARTERLY       SEMI-ANNUAL
  -----------------------------------------     ------------     ------------     ------------
  <S>                                           <C>              <C>              <C>
  Maryland Traditional Trust 304...........       67101L 829       67101L 837      67101L 845
  National Insured Trust 291...............       6710A3 613       6710A3 621      6710A3 639
  California Insured Trust 243.............       67064U 766       67064U 774      67064U 782
</TABLE>
 
                            ------------------------
 
THE NUVEEN TAX-EXEMPT UNIT TRUST
   
SERIES 786
    
 
   
1.  WHAT IS THE NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 786?
    
 
   
Series  786 of the Nuveen  Tax-Exempt Unit Trust is one  of a series of separate
but similar  investment companies  created  by the  Sponsor,  each of  which  is
designated  by  a  different  Series  number.  This  Series  consists  of  three
underlying separate unit investment trusts,  combined under one trust  indenture
and agreement, designated Maryland Traditional Trust 304, National Insured Trust
291  and  California  Insured Trust  243.  The various  trusts  are collectively
referred to herein as the "Trusts"; the trusts in which few or none of the Bonds
are insured are sometimes referred to as the "Traditional Trusts", the trusts in
which all of the Bonds are insured as described herein are sometimes referred to
as the "Insured Trusts", and the state trusts (both Traditional and Insured) are
sometimes referred to as the "State  Trusts." This Series was created under  the
laws  of the State of New York pursuant to a Trust Indenture and Agreement dated
February 23, 1995 (the "Indenture") between John Nuveen & Co. Incorporated  (the
"Sponsor") and United States Trust Company of New York (the "Trustee").
    
 
                                       5
<PAGE>
   
    The  Sponsor has deposited with the  Trustee delivery statements relating to
contracts for the  purchase of  municipal debt obligations  together with  funds
represented by an irrevocable letter of credit issued by a major commercial bank
in  the amount, including accrued interest,  required for their purchase (or the
obligations themselves) in  the principal amount  of $17,500,000 (the  "Bonds"),
which  initially constitute the  underlying securities of  the Trusts. Bonds may
include fixed rate obligations with regularly scheduled interest payments,  zero
coupon  bonds and stripped  obligations, which represent  evidences of ownership
interests with respect to either a principal payment or a payment of interest on
a tax-exempt obligation  ("Stripped Obligations"). See  "SUMMARY OF  PORTFOLIOS"
and  "GENERAL  TRUST INFORMATION"  for  a discussion  of  zero coupon  bonds and
Stripped Obligations. The  following principal  amounts were  deposited in  each
Trust: $3,500,000 in the Maryland Traditional Trust, $10,000,000 in the National
Insured  Trust  and $4,000,000  in  the California  Insured  Trust. Some  of the
delivery statements may relate to contracts for the purchase of "when issued" or
other Bonds with delivery dates after the date of settlement for a purchase made
on the Date of Deposit. See the "Schedules of Investments" and Section 4. For  a
discussion  of  the Sponsor's  obligations  in the  event  of a  failure  of any
contract for  the  purchase  of any  of  the  Bonds and  its  limited  right  to
substitute other bonds to replace any failed contract, see Section 4.
    
 
    Payment  of interest on the Bonds in each Insured Trust, and of principal at
maturity, is guaranteed under policies of  insurance obtained by the Sponsor  or
by  the issuers of the Bonds. (See Section  5.) AS A GENERAL MATTER, NEITHER THE
ISSUER NOR THE SPONSOR HAS OBTAINED INSURANCE  WITH RESPECT TO THE BONDS IN  ANY
TRADITIONAL TRUST.
 
   
    The  Trustee has delivered to the  Sponsor registered Units for 35,000 Units
of the Maryland Traditional Trust, 100,000  Units of the National Insured  Trust
and  40,000  Units of  the California  Insured  Trust, which  together represent
ownership of  the  entire  Series,  and  which are  offered  for  sale  by  this
Prospectus.  Each Unit of a Trust  represents a fractional undivided interest in
the principal and net  income of such Trust  in the ratio of  10 Units for  each
$1,000 principal value of Bonds initially deposited in such Trust. Only Units of
the  National  Insured Trust  are offered  for sale  to Virginia  and Washington
residents by this Prospectus.
    
 
2.  WHAT ARE THE OBJECTIVES OF THE TRUSTS?
 
The objectives of the Trusts are income  exempt from Federal income tax and,  in
the  case of State Trusts, where applicable, state income and intangibles taxes,
and conservation of capital, through an  investment in obligations issued by  or
on  behalf of states  and territories of  the United States  and authorities and
political subdivisions thereof,  the interest  on which  is, in  the opinion  of
recognized  bond counsel  to the  issuing governmental  authorities, exempt from
Federal income tax under existing law. Bonds in any State Trust have been issued
primarily by  or on  behalf of  the  State for  which such  Trust is  named  and
counties,  municipalities, authorities  and political  subdivisions thereof, the
interest on which Bonds is, in the opinion of bond counsel, exempt from  Federal
and  certain state income tax and intangibles  taxes, if any, for purchasers who
qualify as residents of that  State. Insurance guaranteeing the timely  payment,
when  due, of all principal and interest on  the Bonds in each Insured Trust has
been obtained by the Sponsor or by the issuers of such Bonds from Municipal Bond
Investors  Assurance  Corporation,  and  as  a  result  of  such  insurance  the
obligations  in the Insured Trusts are rated "Aaa" by Moody's Investors Service,
Inc. and "AAA" by Standard & Poor's Corporation. (SEE SECTION 5) All obligations
in each Traditional Trust are rated in the
 
                                       6
<PAGE>
category "A" or  better (SP-1  or MIG  2 or  better in  the case  of short  term
obligations  included in  a Short Term  Traditional Trust) by  Standard & Poor's
Corporation  or  Moody's  Investors  Service,  Inc.  (including  provisional  or
conditional  ratings). In addition, certain  Bonds in certain Traditional Trusts
may be covered by  insurance guaranteeing the timely  payment, when due, of  all
principal  and interest. (SEE  SECTION 3.) The portfolios  of National and State
Trusts  consist  of   long-term  (approximately  15   to  40  year   maturities)
obligations;  those of Long Intermediate Trusts  consist of intermediate to long
term (approximately 11 to 19 year maturities) obligations; those of Intermediate
Trusts consist  of intermediate  term (approximately  5 to  15 year  maturities)
obligations; those of Short Intermediate Trusts consist of short to intermediate
term (approximately 3 to 7 year maturities) obligations; and those of Short Term
Trusts consist of short term (approximately 1 to 5 year maturities) obligations.
There  is, of course, no guarantee that the Trusts' objectives will be achieved.
For a  comparison of  net after-tax  return  for various  tax brackets  see  the
"Taxable   Equivalent  Estimated   Current  Return  Tables"   included  in  this
Prospectus.
 
    Each Trust consists  of fixed-rate  municipal debt  obligations. Because  of
this  an investment in a Trust should be made with an understanding of the risks
which an investment in such debt obligations may entail, including the risk that
the value of the debt obligations and  therefore of the Units will decline  with
increases  in  interest  rates. In  general,  the  longer the  period  until the
maturity of a  Bond, the more  sensitive its  value will be  to fluctuations  in
interest rates. During the past decade, there have been substantial fluctuations
in  interest  rates, and,  accordingly, in  the value  of debt  obligations. The
Sponsor cannot predict whether such fluctuations will recur.
 
3.  SUMMARY OF PORTFOLIOS
 
In selecting  Bonds for  the  respective Trusts,  the following  factors,  among
others,  were considered:  (i) the Standard  & Poor's Corporation  rating of the
Bonds or the Moody's Investors Service, Inc. rating of the Bonds (see Section  2
for  a description of  minimum rating standards),  (ii) the prices  of the Bonds
relative  to  other  bonds  of  comparable  quality  and  maturity,  (iii)   the
diversification of Bonds as to purpose of issue and location of issuer, (iv) the
maturity dates of the Bonds, and (v) in the case of the Insured Trusts only, the
availability of Municipal Bond Investors Assurance Corporation insurance on such
Bonds.
 
    In  order for Bonds in the Insured  Trusts to be eligible for Municipal Bond
Investors Assurance Corporation insurance, they must have credit characteristics
which, in the opinion of the  insurer, would qualify them as "investment  grade"
obligations.  Insurance is not a  substitute for the basic  credit of an issuer,
but supplements the existing credit  and provides additional security  therefor.
(SEE SECTION 5.)
 
    Certain  bonds may carry a "mandatory put" (also referred to as a "mandatory
tender" or "mandatory repurchase") feature pursuant to which the holder of  such
bonds will receive payment of the full principal amount thereof on a stated date
prior  to the maturity date unless such  holder affirmatively acts to retain the
bond. Under the Indenture,  the Trustee does  not have the  authority to act  to
retain  Bonds with  such features; accordingly,  it will receive  payment of the
full principal amount of any such Bonds on the stated put date and such date  is
therefore  treated as the maturity date of such Bonds in selecting Bonds for the
respective Trusts and for  purposes of calculating the  average maturity of  the
Bonds in any Trust.
 
                                       7
<PAGE>
   
MARYLAND TRADITIONAL TRUST 304
    
 
   
    The  Portfolio of Maryland  Traditional Trust 304  consists of 7 obligations
issued by  entities located  in Maryland.  Two Bonds  in the  Trust are  general
obligations  of the  governmental entities  issuing them  and are  backed by the
taxing powers thereof. Five Bonds in the  Trust are payable as to principal  and
interest  from  the  income of  a  specific  project or  authority  and  are not
supported by the issuer's power to levy taxes. The sources of payment for  these
Bonds are divided as follows: Electrical System Revenue, 2; Health Care Facility
Revenue,  2; Water and/or Sewer Revenue, 1. Seven issues in the Trust were rated
by Standard & Poor's Corporation as follows: 2--AAA, 1--AA+, 1--AA, 1--A+, 2--A.
Seven issues were rated by Moody's  Investors Service, Inc. as follows:  2--Aaa,
2--Aa, 2-- A1, 1--A2.
    
 
   
    At  the Date of Deposit,  the average maturity of  the Bonds in the Maryland
Traditional Trust is 25.1 years. The average maturity of the Bonds in a Trust is
calculated based upon the stated maturities of the Bonds in such Trust (or, with
respect to Bonds for  which funds or  securities have been  placed in escrow  to
redeem such Bonds on a stated call date, based upon such call date). The average
maturity  of the Bonds in a Trust may  increase or decrease from time to time as
Bonds mature or are called or sold.
    
 
   
    Approximately 28.6% of the  aggregate principal amount of  the Bonds in  the
Trust (accounting for approximately 27.9% of the aggregate offering price of the
Bonds)    are   original    issue   discount    bonds.   See    "GENERAL   TRUST
INFORMATION--ORIGINAL ISSUE  DISCOUNT  BONDS  AND STRIPPED  OBLIGATIONS"  for  a
discussion  of the  characteristics of  such bonds  and of  the risks associated
therewith.
    
 
    Approximately 29% of  the aggregate  principal amount  of the  Bonds in  the
Trust  consists of obligations  of issuers whose  revenues are primarily derived
from the sale of electric energy.
 
    Approximately 29% of  the aggregate  principal amount  of the  Bonds in  the
Trust  are  obligations of  issuers whose  revenues  are primarily  derived from
hospitals or other health  care services. The source  of payment for certain  of
these Bonds, accounting for 14% of the Trust (included in the above percentage),
is  insured by  a commercial insurer.  Consequently, the credit  ratings of such
Bonds essentially  reflect  the strength  of  the insurance  or  guarantee  and,
depending upon the actual structure of the bond issue, are typically rated "Aaa"
or "Aa" by Moody's or "AAA" or "AA" by Standard & Poor's.
 
    For  a discussion of the  risks associated with investments  in the bonds of
various issuers, see "General Trust Information" in this section.
 
   
    The Sponsor entered into contracts to acquire the Bonds between February 21,
1995 and February 22, 1995.  The following summarizes certain information  about
the Bonds as of the business day prior to the Date of Deposit:
    
 
<TABLE>
<CAPTION>
                                                                  DIFFERENCE BETWEEN TRUSTEE'S
                                                               DETERMINATION OF OFFERING PRICE AND
   COST TO    PROFIT (OR LOSS)   ANNUAL INTEREST   BID PRICE              THE BID PRICE
   SPONSOR       TO SPONSOR      INCOME TO TRUST    OF BONDS       (AS % OF PRINCIPAL AMOUNT)
  ----------  -----------------  ----------------  ----------  -----------------------------------
  <S>         <C>                <C>               <C>         <C>
  $3,288,145       $16,470           $199,250      $3,287,740                 .48%
</TABLE>
 
    Neither   cost  to  Sponsor  nor  profit   (or  loss)  to  Sponsor  reflects
underwriting profits or losses received or  incurred by the Sponsor through  its
participation   in  underwriting  syndicates.  An  underwriter  or  underwriting
syndicate purchases bonds  from the issuer  on a negotiated  or competitive  bid
basis    as   principal    with   the    motive   of    marketing   such   bonds
 
                                       8
<PAGE>
to investors at a  profit. The Sponsor  did not participate  as either the  sole
underwriter  or as a manager or member of a syndicate that acted as the original
underwriter of any of the Bonds.
 
   
    Unitholders may  elect to  have interest  distributions made  on a  monthly,
quarterly or semi-annual basis. The interest on the Bonds initially deposited in
the  Maryland Traditional Trust, less estimated expenses, is estimated to accrue
at the  rate  of  $.01536  per  Unit per  day  under  the  semi-annual  plan  of
distribution,  $.01531 per Unit per day under the quarterly plan of distribution
and $.01522 per  Unit per  day under  the monthly  plan of  distribution. It  is
anticipated  that the amount of interest to be distributed per Unit in each year
under each plan  of distribution will  initially be substantially  equal to  the
Estimated Net Annual Interest Income per Unit for that plan.
    
 
    Details of interest distributions per Unit of the Maryland Traditional Trust
under  the various plans appear in the  following table based upon estimated Net
Annual Interest Income at the Date of Deposit:
 
<TABLE>
<CAPTION>
                                                                                                      NORMAL
                                                                                                  DISTRIBUTIONS
MARYLAND TRADITIONAL TRUST                                        1995                               PER YEAR
<S>                                     <C>            <C>            <C>            <C>        <C>
- ------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        4/1            5/1            8/1           11/1
Distribution Date.....................       4/15           5/15           8/15          11/15
- ----------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .5783(1)                                              $  5.4802
                                                        --------  $.4566 every month  --------
Quarterly Distribution Plan...........  $   .5783(1)   $   .4593(2)   $  1.3779      $  1.3779    $  5.5122
Semi-Annual Distribution Plan.........  $   .5783(1)   $   .4608(3)                  $  2.7648    $  5.5312
- ----------------------------------------------------------------------------------------------------------------
<FN>
 * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May  1,
   August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1)  The first distribution will be paid to all Unitholders,  regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The  second distribution  under the  quarterly  distribution plan  represents a  1-month distribution;  subsequent  quarterly
    distributions will be regular 3-month distributions.
(3)  The second distribution  under the semi-annual distribution  plan represents a  1-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
    The accrual amounts set forth above, and  in turn the amount of interest  to
be  distributed annually per Unit, will  generally change as Bonds are redeemed,
mature or are sold or as fees and expenses increase or decrease.
 
TAX STATUS--MARYLAND TRADITIONAL TRUST
 
    For a discussion  of the  Federal tax status  of income  earned on  Maryland
Traditional Trust Units, see Section 11.
 
    The   assets   of   the   Maryland  Traditional   Trust   will   consist  of
interest-bearing obligations issued by  or on behalf of  the State of  Maryland,
its political subdivisions and authorities and, provided the interest thereon is
exempt  from State income  taxes by the  laws or treaties  of the United States,
obligations issued  by  or  on  behalf of  the  United  States'  territories  or
possessions, including Puerto Rico, Guam and the Virgin Islands, their political
subdivisions and authorities (the "Maryland Bonds").
 
                                       9
<PAGE>
    In  the  opinion of  Venable, Baetjer  and Howard,  special counsel  for the
Series for Maryland tax matters, under existing law:
 
        For  Maryland  state  and  local  income  tax  purposes,  the   Maryland
    Traditional  Trust will not be taxable as  an association, and the income of
    the Maryland  Traditional  Trust  will  be treated  as  the  income  of  the
    Unitholders.
 
        For  Maryland state  and local  tax purposes,  interest on  the Maryland
    Bonds which is exempt from Maryland state and local income tax when received
    by the Maryland Traditional Trust, and  which would be exempt from  Maryland
    state and local income tax if received directly by a Unitholder, will retain
    its  status as tax-exempt interest when received by the Maryland Traditional
    Trust and distributed to the Unitholders.
 
        Interest derived from  the Maryland  Traditional Trust  by a  Unitholder
    with  respect to the Maryland Bonds will not be subject to Maryland state or
    local income  taxes;  provided that  interest  or profit  derived  from  the
    Maryland Traditional Trust by a financial institution, as defined in Section
    8-101(c)  of the Tax-General Article of the Annotated Code of Maryland, will
    be subject to the  Maryland state franchise  tax on financial  institutions,
    except  to the  extent such interest  is expressly exempt  from the Maryland
    state franchise tax  by the statutes  which authorize the  issuance of  such
    Maryland  Bonds  (See  Section  8-204  of the  Tax  General  Article  of the
    Annotated Code of Maryland).
 
        A Unitholder will not be subject  to Maryland state or local income  tax
    with  respect  to gain  realized when  Maryland Bonds  held in  the Maryland
    Traditional Trust  are sold,  redeemed,  or paid  at maturity,  except  with
    respect  to gain realized upon a sale,  redemption or payment at maturity of
    such Maryland  Bonds  as  are  issued  by or  on  behalf  of  United  States
    territories  or possessions,  their political  subdivisions and authorities;
    such gain will equal the proceeds  of sale, redemption or payment, less  the
    tax basis of the Maryland Bonds (adjusted to reflect (a) the amortization of
    Bond  premium or discount,  and (b) the deposit  in the Maryland Traditional
    Trust after the Unitholder's settlement date of Maryland Bonds with  accrued
    interest).
 
        Although  the  matter  is  not  free  from  doubt,  gain  realized  by a
    Unitholder from  the redemption,  sale or  other disposition  of a  Maryland
    Traditional  Trust Unit  (i) will  be subject  to Maryland  state income tax
    except in the case of individual Unitholders who are not Maryland residents,
    and (ii)  will be  subject  to Maryland  local income  tax  in the  case  of
    individual Unitholders who are Maryland residents.
 
        If  interest on  indebtedness incurred or  continued by  a Unitholder to
    purchase Units  in the  Maryland  Traditional Trust  is not  deductible  for
    Federal  income tax  purposes, it  will also  be nondeductible  for Maryland
    state income tax purposes and, if applicable, local income tax purposes.
 
        Maryland Traditional Trust Units will be subject to Maryland inheritance
    and estate tax  only if  held by  Maryland residents.  Neither the  Maryland
    Bonds  nor the Maryland Traditional Trust  Units will be subject to Maryland
    personal property tax, sales tax or use tax.
 
ECONOMIC FACTORS--MARYLAND
 
    Some of the significant financial considerations relating to the investments
of the  Maryland Traditional  Trust are  summarized below.  This information  is
derived principally from official statements and preliminary official statements
released on or before May 13,
 
                                       10
<PAGE>
1992,  relating to issues of  Maryland obligations and does  not purport to be a
complete description.
 
    The State's total expenditures  for the fiscal years  ending June 30,  1990,
June  30, 1991  and June  30, 1992  were $11.019,  $11.304 and  $11.657 billion,
respectively. As of January 13, 1993,  it was estimated that total  expenditures
for fiscal 1993 would be $11.897 billion. The State's General Fund, representing
approximately  55%-60% of each year's total budget, had a surplus on a budgetary
basis of $57 million in fiscal year 1990, $55 thousand in fiscal year 1991,  and
a deficit of $56 million in fiscal 1992. The Governor of Maryland reduced fiscal
1993  appropriations by $56 million to offset the fiscal 1992 deficit. The State
Constitution mandates a balanced budget.
 
    The 1993 fiscal year budget was  enacted in April 1992 which, together  with
legislation  enacted in 1992,  involved the transfer of  certain funds, new fees
and taxes, and alteration of certain statutory State expenditure programs.  When
the  1993 budget was enacted, it was  estimated that the General Fund surplus at
June 30, 1993 would  be approximately $10 million  on a budgetary basis.  During
the final months of fiscal year 1992 and the initial months of fiscal year 1993,
collections of State revenues were below the levels estimated at the time of the
adoption  of the 1993 budget.  The Governor proposed a  cost containment plan to
address this  revenue shortfall  and to  provide reserves  to finance  potential
deficiency  appropriations. On  September 30,  1992, the  Board of  Public Works
approved the Governor's proposal to  reduce General Fund appropriations by  $168
million.  The Board  of Public  Works also  approved the  Governor's proposal to
reduce the special fund appropriations  for the Department of Transportation  by
$30  million.  Legislation was  introduced at  the 1993  session of  the General
Assembly to  transfer this  $30 million  to the  General Fund,  as well  as  $10
million from various other special funds. In a special session held in November,
1992,  the  General Assembly  enacted legislation  reducing  State aid  to local
governments by  $147 million.  In  addition, other  elements of  the  governor's
original  cost  containment plan  are  in the  process  of being  implemented or
revised.
 
    The public indebtedness  of Maryland  and its  instrumentalities is  divided
into  three  basic types.  The  State issues  general  obligation bonds,  to the
payment of which the State ad  valorem property tax is exclusively pledged,  for
capital improvements and for various State-sponsored projects. The Department of
Transportation   of  Maryland  issues  limited,  special  obligation  bonds  for
transportation purposes payable primarily from specific, fixed-rate excise taxes
and other  revenues related  mainly to  highway use.  Certain authorities  issue
obligations  payable solely from  specific non-tax enterprise  fund revenues and
for which  the  State  has  no  liability and  has  given  no  moral  obligation
assurance.
 
    According  to the most recent available ratings, general obligation bonds of
the State of Maryland are rated "Aaa" by Moody's and "AAA" by Standard &  Poor's
Corporation,  as  are those  of Baltimore  County,  a separate  political entity
surrounding Baltimore  City.  General  obligation bonds  of  Montgomery  County,
located in the suburbs of Washington, D.C., are rated "Aaa" by Moody's and "AAA"
by  Standard & Poor's  Corporation. General obligation  bonds of Prince George's
County, the second largest metropolitan county, which is also in the suburbs  of
Washington,  D.C., are  rated "A1"  by Moody's  and "AA-"  by Standard  & Poor's
Corporation. The general obligation bonds of  those other counties of the  State
that  are rated  by Moody's carry  an "A" rating  or better except  for those of
Allegany County,  which  are rated  "Baa".  The most  populous  municipality  in
Maryland is Baltimore City, the general
 
                                       11
<PAGE>
obligaton  bonds of which are rated "A1" by Moody's and "A" by Standard & Poor's
Corporation. The majority of Maryland Health and Higher Education Authority  and
State  Department of  Transportation revenue  bond issues  have received  an "A"
rating or better from Moody's.
 
    While the ratings and other  factors mentioned above indicate that  Maryland
and  its principal subdivisions  and agencies are addressing  the effects of the
economic recession and, overall, are in satisfactory economic health, there can,
of course,  be no  assurance that  this will  continue or  that particular  bond
issues  may not be adversely  affected by changes in  state or local economic or
political conditions.
 
MARYLAND TAXABLE ESTIMATED CURRENT RETURN TABLE
 
    The following tables show the approximate taxable estimated current  returns
for  individuals  that are  equivalent to  tax-exempt estimated  current returns
under combined Federal,  state and  local taxes, using  published 1995  marginal
Federal tax rates and marginal state and local tax rates currently available and
scheduled  to  be in  effect*. The  tables incorporate  increased tax  rates for
higher-income taxpayers that were included in the Revenue Reconciliation Act  of
1993.  Except as indicated below, for cases in which more than one state bracket
falls within a Federal bracket, the  highest state bracket is combined with  the
Federal  bracket.  The  combined state,  local  and Federal  tax  brackets shown
reflect the fact that  state tax payments are  currently deductible for  Federal
tax  purposes. The  tables illustrate  what you  would have  to earn  on taxable
investments to equal the tax-exempt estimated current return for your income tax
bracket. A taxpayer's marginal tax rate  is affected by both his taxable  income
and  his  adjusted gross  income. Locate  your adjusted  gross and  your taxable
income (which  is your  adjusted  gross income  reduced  by any  deductions  and
exemptions),  then locate your tax bracket based  on joint or single tax filing.
Read across to the equivalent taxable estimated current return you would need to
match the tax-free income.
 
                                       12
<PAGE>
 COMBINED MARGINAL TAX RATES FOR JOINT TAXPAYERS WITH FOUR PERSONAL EXEMPTIONS
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                  FEDERAL      COMBINED
    FEDERAL      ADJUSTED       STATE*,
    TAXABLE        GROSS       LOCAL AND                   TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME        FEDERAL       --------------------------------------------------------------
   (1,000'S)     (1,000'S)     TAX RATE1      5.00%   5.25%   5.50%   5.75%   6.00%   6.25%   6.50%   6.75%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 39.0 $     0-114.7      21.5   %     6.37    6.69    7.01    7.32    7.64    7.96    8.28    8.60
    39.0- 94.3       0-114.7      33.5         7.52    7.89    8.27    8.65    9.02    9.40    9.77   10.15
                 114.7-172.1      34.0         7.58    7.95    8.33    8.71    9.09    9.47    9.85   10.23
    94.3-143.6       0-114.7      36.0         7.81    8.20    8.59    8.98    9.38    9.77   10.16   10.55
                 114.7-172.1      37.0         7.94    8.33    8.73    9.13    9.52    9.92   10.32   10.71
                 172.1-294.6      39.5         8.26    8.68    9.09    9.50    9.92   10.33   10.74   11.16
   143.6-150.0   114.7-172.1      42.0         8.62    9.05    9.48    9.91   10.34   10.78   11.21   11.64
                 172.1-294.6      44.5         9.01    9.46    9.91   10.36   10.81   11.26   11.71   12.16
   150.0-256.5   114.7-172.1      42.5         8.70    9.13    9.57   10.00   10.43   10.87   11.30   11.74
                 172.1-294.6      45.5         9.17    9.63   10.09   10.55   11.01   11.47   11.93   12.39
                  Over 294.6      42.5   2     8.70    9.13    9.57   10.00   10.43   10.87   11.30   11.74
    Over 256.5   172.1-294.6      49.0         9.80   10.29   10.78   11.27   11.76   12.25   12.75   13.24
                  Over 294.6      46.0   3     9.26    9.72   10.19   10.65   11.11   11.57   12.04   12.50
                COMBINED MARGINAL TAX RATES FOR SINGLE TAXPAYERS WITH ONE PERSONAL EXEMPTION
 -----------------------------------------------------------------------------------------------------------
 
<CAPTION>
                  FEDERAL      COMBINED
    FEDERAL      ADJUSTED       STATE*,
    TAXABLE        GROSS       LOCAL AND                   TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME        FEDERAL       --------------------------------------------------------------
   (1,000'S)     (1,000'S)     TAX RATE1      5.00%   5.25%   5.50%   5.75%   6.00%   6.25%   6.50%   6.75%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 23.4 $     0-114.7      21.5         6.37    6.69    7.01    7.32    7.64    7.96    8.28    8.60
    23.4- 56.6       0-114.7      33.5         7.52    7.89    8.27    8.65    9.02    9.40    9.77   10.15
    56.6-100.0       0-114.7      36.0         7.81    8.20    8.59    8.98    9.38    9.77   10.16   10.55
                 114.7-237.2      37.5         8.00    8.40    8.80    9.20    9.60   10.00   10.40   10.80
   100.0-118.0   114.7-237.2      38.5         8.13    8.54    8.94    9.35    9.76   10.16   10.57   10.98
   118.0-256.5   114.7-237.2      43.5         8.85    9.29    9.73   10.18   10.62   11.06   11.50   11.95
                  Over 237.2      42.5   2     8.70    9.13    9.57   10.00   10.43   10.87   11.30   11.74
    Over 256.5    Over 237.2      46.0   3     9.26    9.72   10.19   10.65   11.11   11.57   12.04   12.50
</TABLE>
 
- ------------------
 
     * These tables approximate the effect of the exemption of distributions  of
tax-exempt  income from  the Maryland Trust  from county taxes,  assuming a rate
equal to  50% of  the applicable  Maryland state  income tax  rate. In  general,
Maryland   local  income  taxes  imposed  by   various  counties  are  equal  to
approximately 50% of the state  income tax liability, although Worcester  County
currently imposes an income tax equal to 30% of the state income tax liability.
 
       1 The table reflects the effect of the limitations on itemized deductions
and  the  deduction for  personal exemptions.  They were  designed to  phase out
certain  benefits  of  these  deductions  for  higher  income  taxpayers.  These
limitations,  in effect, raise the current  maximum marginal Federal tax rate to
approximately 44.0 percent for taxpayers filing  a joint return and entitled  to
four  personal exemptions and to approximately 41.0 percent for taxpayers filing
a single return entitled to only  one personal exemption. These limitations  are
subject  to certain maximums,  which depend on the  number of exemptions claimed
and the total  amount of the  taxpayer's itemized deductions.  For example,  the
limitation  on itemized deductions will  not cause a taxpayer  to lose more than
80% of his allowable itemized deductions, with certain exceptions.
 
       2 Federal tax rate reverts to 36.0%  after the 80% cap on the  limitation
on itemized deductions has been met.
 
       3  Federal tax rate reverts to 39.6%  after the 80% cap on the limitation
on itemized deductions has been met.
 
    A comparison of  tax-free and equivalent  taxable estimated current  returns
with  the returns on various  taxable investments is one  element to consider in
making an  investment  decision.  The Sponsor  may  from  time to  time  in  its
advertising  and sales materials  compare the then  current estimated returns on
the Trust and returns over specified periods on other similar Nuveen Trusts with
returns on taxable investments such as corporate or U.S. Government bonds,  bank
CD's  and  money  market accounts  or  money  market funds,  each  of  which has
investment characteristics  that  may  differ  from those  of  the  Trust.  U.S.
Government  bonds, for example, are  backed by the full  faith and credit of the
U.S. Government and bank CD's and money market accounts are insured by an agency
of the federal government. Money market accounts and money market funds  provide
stability  of principal, but pay interest at  rates that vary with the condition
of the short-term debt market. The  investment characteristics of the Trust  are
described more fully elsewhere in this Prospectus.
 
                                       13
<PAGE>
   
NUVEEN TAX-EXEMPT UNIT TRUST
SCHEDULE OF INVESTMENTS AT DATE OF DEPOSIT
FEBRUARY 23, 1995
MARYLAND TRADITIONAL TRUST 304
(SERIES 786)
    
 
<TABLE>
<CAPTION>
                                                                                          Ratings(3)           Trustee's
                                                                      Optional       ---------------------   Determination
 Aggregate        Name of Issuer and Title of Issue Represented      Redemption       Standard                of Offering
  Principal        by Sponsor's Contracts to Purchase Bonds(1)      Provisions(2)     & Poor's    Moody's      Price(4)
<C>          <C> <S>                                              <C>                <C>         <C>        <C>
- ---------------------------------------------------------------------------------------------------------------------------
$   500,000      Maryland Health and Higher Educational              2004 at 102        AAA         Aaa     $       504,005
                   Facilities Authority, Revenue Bonds, Maryland
                   General Hospital Issue, Series 1994, 6.20%
                   Due 7/1/24. (MBIA Insured.)
    500,000      Maryland Health and Higher Educational              2003 at 102         A          A1              424,885
                   Facilities Authority, Refunding Revenue
                   Bonds, Suburban Hospital Issue, Series 1993,
                   5.125% Due 7/1/21. (Original issue discount
                   bonds delivered on or about October 14, 1993
                   at a price of 94.689% of principal amount.)
    500,000      Maryland Water Quality Financing                    2004 at 100         AA         Aa              497,500
                   Administration, Revolving Loan Fund Revenue
                   Bonds, Series 1994 A, 6.00% Due 9/1/15.
                   (Original issue discount bonds delivered on
                   or about January 11, 1995 at a price of
                   93.279% of principal amount.)
    500,000      Anne Arundel County, Maryland, General              2003 at 102        AA+         Aa              455,550
                   Obligation Bonds, Consolidated Water and
                   Sewer Series, 1993 Refunding Series, 5.30%
                   Due 4/15/16.
    500,000      Anne Arundel County, Maryland, Pollution            2004 at 102         A          A2              486,560
                   Control Revenue Refunding Bonds (Baltimore
                   Gas and Electric Company Project), Series
                   1994, 6.00% Due 4/1/24.
    500,000      Montgomery County, Maryland, Pollution Control      2004 at 102         A+         A1              444,795
                   Revenue Refunding Bonds (Potomac Electric
                   Project), 1994 Series, 5.375% Due 2/15/24.
    500,000      Wicomico County, Maryland, General Obligation       2005 at 101        AAA         Aaa             491,320
                   Consolidated Public Improvement Bonds of
                   1995, 5.85% Due 2/1/15. (When issued.) (FGIC
                   Insured.)
- -----------                                                                                                 ---------------
$ 3,500,000                                                                                                 $     3,304,615
- -----------                                                                                                 ---------------
- -----------                                                                                                 ---------------
</TABLE>
 
See Notes to Schedules of Investments, page 33.
 
                                       14
<PAGE>
   
NATIONAL INSURED TRUST 291
    
   
    The  Portfolio  of  National Insured  Trust  291  consists of  13  long term
(approximately 15 to 40 year maturities) obligations issued by entities  located
in  9 states. Two Bonds in the Trust are general obligations of the governmental
entities issuing them and are backed by the taxing powers thereof. Eleven  Bonds
in  the Trust  are payable  as to principal  and interest  from the  income of a
specific project or  authority and are  not supported by  the issuer's power  to
levy  taxes. The  sources of  payment for  these Bonds  are divided  as follows:
College and University  Revenue, 2;  Electrical System Revenue,  3; Health  Care
Facility  Revenue,  4; Transportation  Facility Revenue,  1; Water  and/or Sewer
Revenue, 1. All of the Bonds in the Trust, as insured, are rated AAA by Standard
& Poor's  Corporation and  Aaa by  Moody's Investors  Service, Inc.  Twenty-four
percent  of the  principal amount of  Bonds in  the Trust consists  of issues of
entities located in the State of  Illinois; such concentration may involve  more
risk than if such Bonds were issued by issuers located in several states.
    
 
   
    At  the Date of Deposit,  the average maturity of  the Bonds in the National
Insured Trust is 27.3  years. The average  maturity of the Bonds  in a Trust  is
calculated based upon the stated maturities of the Bonds in such Trust (or, with
respect  to Bonds for  which funds or  securities have been  placed in escrow to
redeem such Bonds on a stated call date, based upon such call date). The average
maturity of the Bonds in a Trust may  increase or decrease from time to time  as
Bonds mature or are called or sold.
    
 
   
    Approximately  7.6% of  the aggregate principal  amount of the  Bonds in the
Trust (accounting for approximately 7.6% of the aggregate offering price of  the
Bonds)    are   original    issue   discount    bonds.   See    "GENERAL   TRUST
INFORMATION--ORIGINAL ISSUE  DISCOUNT  BONDS  AND STRIPPED  OBLIGATIONS"  for  a
discussion  of the  characteristics of  such bonds  and of  the risks associated
therewith.
    
 
    Approximately 20% of  the aggregate  principal amount  of the  Bonds in  the
Trust  consists of obligations  of issuers whose  revenues are primarily derived
from  payments  to  colleges  and  universities,  including  tuition,  dormitory
revenues, grants and endorsements.
 
    Approximately  30% of  the aggregate  principal amount  of the  Bonds in the
Trust consists of obligations  of issuers whose  revenues are primarily  derived
from the sale of electric energy.
 
    Approximately  29% of  the aggregate  principal amount  of the  Bonds in the
Trust consists of obligations  of issuers whose  revenues are primarily  derived
from services provided by hospitals or other health care facilities.
 
    For  a discussion of the  risks associated with investments  in the bonds of
various issuers, see "General Trust Information" in this section.
 
   
    The Sponsor entered into contracts to acquire the Bonds between February 14,
1995 and February 22, 1995.  The following summarizes certain information  about
the Bonds as of the business day prior to the Date of Deposit:
    
 
<TABLE>
<CAPTION>
                                                                  DIFFERENCE BETWEEN TRUSTEE'S
                                                               DETERMINATION OF OFFERING PRICE AND
   COST TO    PROFIT (OR LOSS)   ANNUAL INTEREST   BID PRICE              THE BID PRICE
   SPONSOR       TO SPONSOR      INCOME TO TRUST    OF BONDS       (AS % OF PRINCIPAL AMOUNT)
  ----------  -----------------  ----------------  ----------  -----------------------------------
  <S>         <C>                <C>               <C>         <C>
  $9,619,766       $60,438           $598,513      $9,632,704                 .48%
</TABLE>
 
    Neither   cost  to  Sponsor  nor  profit   (or  loss)  to  Sponsor  reflects
underwriting profits or losses received or  incurred by the Sponsor through  its
participation   in  underwriting  syndicates.  An  underwriter  or  underwriting
syndicate purchases bonds  from the issuer  on a negotiated  or competitive  bid
basis  as principal with  the motive of  marketing such bonds  to investors at a
profit. The  Sponsor participated  as  either the  sole underwriter  or  manager
 
                                       15
<PAGE>
   
or  as a member of the syndicates  which were the original underwriters of 10.0%
of the aggregate principal amount of the Bonds.
    
 
   
    Unitholders may  elect to  have interest  distributions made  on a  monthly,
quarterly or semi-annual basis. The interest on the Bonds initially deposited in
the  National Insured Trust, less estimated  expenses, is estimated to accrue at
the rate of $.01619 per Unit per day under the semi-annual plan of distribution,
$.01613 per Unit per  day under the quarterly  plan of distribution and  $.01604
per  Unit per day under the monthly plan of distribution. It is anticipated that
the amount of interest to be distributed  per Unit in each year under each  plan
of  distribution  will initially  be substantially  equal  to the  Estimated Net
Annual Interest Income per Unit for that plan.
    
 
    Details of interest  distributions per  Unit of the  National Insured  Trust
under  the various plans appear in the  following table based upon estimated Net
Annual Interest Income at the Date of Deposit:
 
<TABLE>
<CAPTION>
                                                                                                      NORMAL
                                                                                                  DISTRIBUTIONS
NATIONAL INSURED TRUST                                            1995                               PER YEAR
<S>                                     <C>            <C>            <C>            <C>        <C>
- ------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        4/1            5/1            8/1           11/1
Distribution Date.....................       4/15           5/15           8/15          11/15
- ----------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .6095(1)                                              $  5.7777
                                                        --------  $.4812 every month  --------
Quarterly Distribution Plan...........  $   .6095(1)   $   .4839(2)   $  1.4517      $  1.4517    $  5.8097
Semi-Annual Distribution Plan.........  $   .6095(1)   $   .4857(3)                  $  2.9142    $  5.8287
- ----------------------------------------------------------------------------------------------------------------
<FN>
 * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May  1,
   August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1)  The first distribution will be paid to all Unitholders,  regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The  second distribution  under the  quarterly  distribution plan  represents a  1-month distribution;  subsequent  quarterly
    distributions will be regular 3-month distributions.
(3)  The second distribution  under the semi-annual distribution  plan represents a  1-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
    The accrual amounts set forth above, and  in turn the amount of interest  to
be  distributed annually per Unit, will  generally change as Bonds are redeemed,
mature or are sold or as fees and expenses increase or decrease.
 
TAX STATUS--NATIONAL INSURED TRUST
 
    For a discussion  of the  tax status of  income earned  on National  Insured
Trust Units, see Section 11.
 
NATIONALLY DIVERSIFIED TRUST TAXABLE ESTIMATED CURRENT RETURN TABLE
(NATIONAL TRADITIONAL TRUST)
 
    The  following tables show the approximate taxable estimated current returns
for individuals  that are  equivalent to  tax-exempt estimated  current  returns
under  published  1995  marginal  Federal  tax  rates.  The  tables  incorporate
increased tax  rates for  higher-income tax  payers that  were included  in  the
Revenue Reconciliation Act of 1993. The tables illustrate what you would have to
earn on taxable investments to equal the tax-exempt estimated current return for
your  income tax bracket. A taxpayer's marginal tax rate is affected by both his
taxable income and his adjusted gross income. Locate your adjusted gross  income
and  your taxable  income (which  is your adjusted  gross income  reduced by any
deductions and  exemptions), then  locate your  tax bracket  based on  joint  or
single  tax  filing. Read  across to  the  equivalent taxable  estimated current
return you would need to match the tax-free income.
 
                                       16
<PAGE>
  MARGINAL FEDERAL TAX RATES FOR JOINT TAXPAYERS WITH FOUR PERSONAL EXEMPTIONS
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL
    FEDERAL      ADJUSTED
    TAXABLE        GROSS                                   TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME        FEDERAL       --------------------------------------------------------------
   (1,000'S)     (1,000'S)     TAX RATE1      5.25%   5.50%   5.75%   6.00%   6.25%   6.50%   6.75%   7.00%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 39.0 $     0-114.7      15.0   %     6.18    6.47    6.76    7.06    7.35    7.65    7.94    8.24
    39.0- 94.3       0-114.7      28.0         7.29    7.64    7.99    8.33    8.68    9.03    9.38    9.72
                 114.7-172.1      29.0         7.39    7.75    8.10    8.45    8.80    9.15    9.51    9.86
    94.3-143.6       0-114.7      31.0         7.61    7.97    8.33    8.70    9.06    9.42    9.78   10.14
                 114.7-172.1      32.0         7.72    8.09    8.46    8.82    9.19    9.56    9.93   10.29
                 172.1-294.6      34.5         8.02    8.40    8.78    9.16    9.54    9.92   10.31   10.69
   143.6-256.5   114.7-172.1      37.0         8.33    8.73    9.13    9.52    9.92   10.32   10.71   11.11
                 172.1-294.6      40.0         8.75    9.17    9.58   10.00   10.42   10.83   11.25   11.67
                  Over 294.6      37.0   2     8.33    8.73    9.13    9.52    9.92   10.32   10.71   11.11
    Over 256.5   172.1-294.6      44.0         9.38    9.82   10.27   10.71   11.16   11.61   12.05   12.50
                  Over 294.6      41.0   3     8.90    9.32    9.75   10.17   10.59   11.02   11.44   11.86
</TABLE>
 
  MARGINAL FEDERAL TAX RATES FOR SINGLE TAXPAYERS WITH ONE PERSONAL EXEMPTION
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL
    FEDERAL      ADJUSTED
    TAXABLE        GROSS                                   TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME        FEDERAL       --------------------------------------------------------------
   (1,000'S)     (1,000'S)     TAX RATE1      5.25%   5.50%   5.75%   6.00%   6.25%   6.50%   6.75%   7.00%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 23.4 $     0-114.7      15.0   %     6.18    6.47    6.76    7.06    7.35    7.65    7.94    8.24
    23.4- 56.6       0-114.7      28.0         7.29    7.64    7.99    8.33    8.68    9.03    9.38    9.72
    56.6-118.0       0-114.7      31.0         7.61    7.97    8.33    8.70    9.06    9.42    9.78   10.14
                 114.7-237.2      32.5         7.78    8.15    8.52    8.89    9.26    9.63   10.00   10.37
   118.0-256.5   114.7-237.2      38.0         8.47    8.87    9.27    9.68   10.08   10.48   10.89   11.29
                  Over 237.2      37.0   2     8.33    8.73    9.13    9.52    9.92   10.32   10.71   11.11
    Over 256.5    Over 237.2      41.0   3     8.90    9.32    9.75   10.17   10.59   11.02   11.44   11.86
<FN>
- ------------------
      1 The table reflects the effect of the limitations  on itemized deductions and the deduction for personal exemptions.  They
were  designed to phase out certain benefits of these deductions for higher income taxpayers. These limitations, in effect, raise
the current maximum marginal Federal tax rate to approximately 44.0  percent for taxpayers filing a joint return and entitled  to
four  personal exemptions and to  approximately 41.0 percent for taxpayers  filing a single return  entitled to only one personal
exemption. These limitations are  subject to certain maximums,  which depend on  the number of exemptions  claimed and the  total
amount  of the taxpayer's itemized  deductions. For example, the limitation  on itemized deductions will  not cause a taxpayer to
lose more than 80% of his allowable itemized deductions, with certain exceptions.
      2 Federal tax rate reverts to 36.0% after the 80% cap on the limitation on itemized deductions has been met.
      3 Federal tax rate reverts to 39.6% after the 80% cap on the limitation on itemized deductions has been met.
</TABLE>
 
    A comparison of  tax-free and equivalent  taxable estimated current  returns
with  the returns on various  taxable investments is one  element to consider in
making an  investment  decision.  The Sponsor  may  from  time to  time  in  its
advertising  and sales materials  compare the then  current estimated returns on
the Trust and returns over specified periods on other similar Nuveen Trusts with
returns on taxable investments such as corporate or U.S. Government bonds,  bank
CD's  and  money  market accounts  or  money  market funds,  each  of  which has
investment characteristics  that  may  differ  from those  of  the  Trust.  U.S.
Government  bonds, for example, are  backed by the full  faith and credit of the
U.S. Government and bank CD's and money market accounts are insured by an agency
of the federal government. Money market accounts and money market funds  provide
stability  of principal, but pay interest at  rates that vary with the condition
of the short-term debt market. The  investment characteristics of the Trust  are
described more fully elsewhere in this Prospectus.
 
                                       17
<PAGE>
   
NUVEEN TAX-EXEMPT UNIT TRUST
SCHEDULE OF INVESTMENTS AT DATE OF DEPOSIT
FEBRUARY 23, 1995
NATIONAL INSURED TRUST 291
(SERIES 786)
    
 
<TABLE>
<CAPTION>
                                                                                          Ratings(3)           Trustee's
                                                                      Optional       ---------------------   Determination
 Aggregate        Name of Issuer and Title of Issue Represented      Redemption       Standard                of Offering
  Principal        by Sponsor's Contracts to Purchase Bonds(1)      Provisions(2)     & Poor's    Moody's      Price(4)
<C>          <C> <S>                                              <C>                <C>         <C>        <C>
- ---------------------------------------------------------------------------------------------------------------------------
$ 1,000,000      The Regents of the University of California,        2003 at 102        AAA         Aaa     $       993,750
                   Refunding Revenue Bonds (Multiple Purpose
                   Projects), Series B, 6.00% Due 9/1/13.
     75,000      Colorado Health Facilities Authority, Hospital      2003 at 102        AAA         Aaa              74,250
                   Revenue Bonds (North Colorado Medical
                   Center), Series 1993, 6.00% Due 5/15/20.
  1,000,000      Hillsborough County Industrial Development          2004 at 102        AAA         Aaa           1,000,000
                   Authority (Florida), Pollution Control
                   Revenue Refunding Bonds (Tampa Electric
                   Company Project), Series 1994, 6.25% Due
                   12/1/34.
  1,500,000      Illinois Health Facilities Authority, Revenue       2004 at 102        AAA         Aaa           1,455,225
                   Bonds, Series 1994A (The University of
                   Chicago Hospitals Project), 6.125% Due
                   8/15/24.
    500,000      City of Chicago (Illinois), Wastewater              2005 at 102        AAA         Aaa             503,045
                   Transmission Revenue Bonds, Series 1994,
                   6.375% Due 1/1/24.
    395,000      Public Building Commission of Chicago               2003 at 102        AAA         Aaa             368,361
                   (Illinois), Building Revenue Bonds, Series A
                   of 1993 (Board of Education of the City of
                   Chicago), 5.75% Due 12/1/18. (General
                   Obligation Bonds.)
  1,000,000      City of Council Bluffs, Iowa, Pollution Control     2003 at 102        AAA         Aaa             954,000
                   Refunding Revenue Bonds (Midwest Power
                   Systems Inc. Project), Series 1993, 5.95% Due
                   5/1/23.
    275,000      New Hampshire Higher Educational and Health         2004 at 102        AAA         Aaa             263,997
                   Facilities Authority Revenue Bonds, The
                   Hitchcock Clinic Issue, Series 1994, 6.00%
                   Due 7/1/24.
  1,000,000      Dormitory Authority of the State of New York,       2003 at 102        AAA         Aaa             936,220
                   City University System Consolidated Revenue
                   Bonds, Series 1993F, 5.50% Due 7/1/12.
    755,000      Metropolitan Transportation Authority (New        2004 at 101 1/2      AAA         Aaa             739,621
                   York), Transit Facilities Revenue Bonds,
                   Series O, 6.00% Due 7/1/24. (Original issue
                   discount bonds delivered on or about July 12,
                   1994 at a price of 94.872% of principal
                   amount.)
  1,000,000      Harris County Health Facilities (Texas),            2004 at 101        AAA         Aaa           1,006,020
                   Development Corporation Hospital Revenue
                   Bonds (Hermann Hospital), Series 1994, 6.375%
                   Due 10/1/24.
    500,000      King County, Washington, Department of              2004 at 102        AAA         Aaa             496,335
                   Metropolitan Services, General Obligation
                   Sewer Revenue Bonds, 1994 Series A, 6.25% Due
                   1/1/34.
  1,000,000      Washington Public Power Supply System               2003 at 102        AAA         Aaa             889,380
                   (Bonneville), Nuclear Project No. 1 Refunding
                   Revenue Bonds, Series 1993C, 5.375% Due
                   7/1/15.
- -----------                                                                                                 ---------------
$10,000,000                                                                                                 $     9,680,204
- -----------                                                                                                 ---------------
- -----------                                                                                                 ---------------
</TABLE>
 
See Notes to Schedules of Investments, page 33.
 
                                       18
<PAGE>
   
CALIFORNIA INSURED TRUST 243
    
 
   
    The  Portfolio of  California Insured  Trust 243  consists of  6 obligations
issued by entities located in California and one obligation issued by an  entity
located  in the  Territory of Puerto  Rico. One Bond  in the Trust  is a general
obligation of the  governmental entity issuing  it and is  backed by the  taxing
power  thereof. Six Bonds in the Trust  are payable as to principal and interest
from the income of a specific project or authority and are not supported by  the
issuer's power to levy taxes. The sources of payment for these Bonds are divided
as  follows: College  and University Revenue,  2; Electrical  System Revenue, 1;
Health Care Facility Revenue, 1; Municipal Lease Revenue, 2. All of the Bonds in
the Trust, as insured, are rated AAA by Standard & Poor's Corporation and Aaa by
Moody's Investors Service, Inc.
    
 
   
    At the Date of Deposit, the average maturity of the Bonds in the  California
Insured  Trust is 27.3  years. The average maturity  of the Bonds  in a Trust is
calculated based upon the stated maturities of the Bonds in such Trust (or, with
respect to Bonds for  which funds or  securities have been  placed in escrow  to
redeem such Bonds on a stated call date, based upon such call date). The average
maturity  of the Bonds in a Trust may  increase or decrease from time to time as
Bonds mature or are called or sold.
    
 
    Approximately 28% of  the aggregate  principal amount  of the  Bonds in  the
Trust  consists of obligations  of issuers whose  revenues are primarily derived
from  payments  to  colleges  and  universities,  including  tuition,  dormitory
revenues, grants and endorsements.
 
    Approximately  30% of  the aggregate  principal amount  of the  Bonds in the
Trust consists of municipal lease obligations.
 
    For a discussion of  the risks associated with  investments in the bonds  of
various issuers, see "General Trust Information" in this section.
 
   
    The  Sponsor entered  into contracts  to acquire  the Bonds  on February 22,
1995. The following  summarizes certain information  about the Bonds  as of  the
business day prior to the Date of Deposit:
    
 
<TABLE>
<CAPTION>
                                                                  DIFFERENCE BETWEEN TRUSTEE'S
                                                               DETERMINATION OF OFFERING PRICE AND
   COST TO    PROFIT (OR LOSS)   ANNUAL INTEREST   BID PRICE              THE BID PRICE
   SPONSOR       TO SPONSOR      INCOME TO TRUST    OF BONDS       (AS % OF PRINCIPAL AMOUNT)
  ----------  -----------------  ----------------  ----------  -----------------------------------
  <S>         <C>                <C>               <C>         <C>
  $3,795,810       $28,015           $233,850      $3,804,575                 .48%
</TABLE>
 
    Neither   cost  to  Sponsor  nor  profit   (or  loss)  to  Sponsor  reflects
underwriting profits or losses received or  incurred by the Sponsor through  its
participation   in  underwriting  syndicates.  An  underwriter  or  underwriting
syndicate purchases bonds  from the issuer  on a negotiated  or competitive  bid
basis  as principal with  the motive of  marketing such bonds  to investors at a
profit. The Sponsor did not participate as  either the sole underwriter or as  a
manager  or member of a syndicate that  acted as the original underwriter of any
of the Bonds.
 
   
    Unitholders may  elect to  have interest  distributions made  on a  monthly,
quarterly or semi-annual basis. The interest on the Bonds initially deposited in
the California Insured Trust, less estimated expenses, is estimated to accrue at
the rate of $.01575 per Unit per day under the semi-annual plan of distribution,
$.01570  per Unit per day  under the quarterly plan  of distribution and $.01561
per Unit per day under the monthly plan of distribution. It is anticipated  that
the  amount of interest to be distributed per  Unit in each year under each plan
of distribution  will initially  be  substantially equal  to the  Estimated  Net
Annual Interest Income per Unit for that plan.
    
 
                                       19
<PAGE>
    Details  of interest distributions per Unit  of the California Insured Trust
under the various plans appear in  the following table based upon estimated  Net
Annual Interest Income at the Date of Deposit:
 
<TABLE>
<CAPTION>
                                                                                                      NORMAL
                                                                                                  DISTRIBUTIONS
CALIFORNIA INSURED TRUST                                          1995                               PER YEAR
<S>                                     <C>            <C>            <C>            <C>        <C>
- ------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        4/1            5/1            8/1           11/1
Distribution Date.....................       4/15           5/15           8/15          11/15
- ----------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .5931(1)                                              $  5.6205
                                                        --------  $.4683 every month  --------
Quarterly Distribution Plan...........  $   .5931(1)   $   .4710(2)   $  1.4130      $  1.4130    $  5.6525
Semi-Annual Distribution Plan.........  $   .5931(1)   $   .4725(3)                  $  2.8350    $  5.6715
- ----------------------------------------------------------------------------------------------------------------
<FN>
 *  Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
   August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all  Unitholders, regardless of the distribution plan selected. Such distribution  may
    be more or less than a regular monthly distribution.
(2)  The  second distribution  under the  quarterly distribution  plan  represents a  1-month distribution;  subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution  under the semi-annual  distribution plan represents a  1-month distribution; subsequent  semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
    The  accrual amounts set forth above, and  in turn the amount of interest to
be distributed annually per Unit, will  generally change as Bonds are  redeemed,
mature or are sold or as fees and expenses increase or decrease.
 
TAX STATUS--CALIFORNIA INSURED TRUST
 
    For  a discussion of the  Federal tax status of  income earned on California
Insured Trust Units, see Section 11.
 
    In the opinion of Orrick, Herrington & Sutcliffe, special California counsel
to the Series, under existing California income and property tax law  applicable
to individuals who are California residents:
 
        The  California  Insured  Trust  is  not  an  association  taxable  as a
    corporation and the income of the  California Insured Trust will be  treated
    as the income of the Unitholders under the income tax laws of California.
 
        Interest  on the underlying securities (which may include bonds or other
    obligations issued by the  governments of Puerto  Rico, the Virgin  Islands,
    Guam  or  the  Northern Mariana  Islands)  which  is exempt  from  tax under
    California personal income tax  and property tax laws  when received by  the
    California  Insured  Trust  will,  under such  laws,  retain  its  status as
    tax-exempt interest when  distributed to Unitholders.  However, interest  on
    the  underlying securities attributed to a Unitholder which is a corporation
    subject to the California franchise tax laws may be includable in its  gross
    income for purposes of determining its California franchise tax.
 
        Under  California  income tax  law,  each Unitholder  in  the California
    Insured Trust will have  a taxable event when  the California Insured  Trust
    disposes  of a security (whether by sale, exchange, redemption or payment at
    maturity) or when  the Unitholder  redeems or  sells Units.  Because of  the
    requirement  that tax cost basis be  reduced to reflect amortization of bond
    premium, under some circumstances a Unitholder may realize taxable gain when
    Units are sold  or redeemed  for an  amount equal  to, or  less than,  their
    original  cost. The total tax cost of each Unit to a Unitholder is allocated
    among each  of the  bond issues  held in  the California  Insured Trust  (in
    accordance  with the proportion of the California Insured Trust comprised by
    each bond
 
                                       20
<PAGE>
    issue) in order to determine his per unit tax cost for each bond issue;  and
    the tax cost reduction requirements relating to amortization of bond premium
    will  apply separately to the per unit cost of each bond issue. Unitholders'
    bases in their Units,  and the bases for  their fractional interest in  each
    California  Insured Trust asset, may have to  be adjusted for their pro rata
    share of accrued interest  received, if any,  on securities delivered  after
    the Unitholders' respective settlement dates.
 
        Under  the California personal  property tax laws,  bonds (including the
    bonds  in  the  California  Insured  Trust  as  well  as  "regular-way"  and
    "when-issued"  contracts for the purchase of  bonds) or any interest therein
    is exempt from such tax.
 
        Any proceeds paid under  the insurance policy issued  to the Trustee  of
    the  fund with respect to the bonds  in the California Insured Trust as well
    as "regular-way" and "when-issued" contracts for the purchase of bonds which
    represent maturing interest  on defaulted  obligations held  by the  Trustee
    will  be exempt  from California  personal income  tax if,  and to  the same
    extent as, such interest would have been so exempt if paid by the issuer  of
    the defaulted obligations.
 
        Under  Section 17280(b)(2) of the  California Revenue and Taxation Code,
    interest on indebtedness incurred or continued to purchase or carry Units of
    the California  Insured Trust  is not  deductible for  the purposes  of  the
    California  personal  income tax.  While  there presently  is  no California
    authority interpreting  this  provision,  Section  17280(b)(2)  directs  the
    California  Franchise  Tax Board  to  prescribe regulations  determining the
    proper allocation and apportionment of interest costs for this purpose.  The
    Franchise  Tax Board has not yet proposed or prescribed such regulations. In
    interpreting the generally similar  Federal provision, the Internal  Revenue
    Service  has taken the position that  such indebtedness need not be directly
    traceable to the purchase or carrying of Units (although the Service has not
    contended that a deduction for interest on indebtedness incurred to purchase
    or improve  a  personal residence  or  to  purchase goods  or  services  for
    personal  consumption  will be  disallowed). In  the absence  of conflicting
    regulations or  other California  authority,  the California  Franchise  Tax
    Board  generally  has  interpreted California  statutory  tax  provisions in
    accord with  Internal Revenue  Service  interpretations of  similar  Federal
    provisions.
 
ECONOMIC FACTORS--CALIFORNIA
 
    As  described  above, except  to the  extent the  Fund invests  in temporary
investments, the Fund will invest substantially all of its assets in  California
Municipal  Obligations. The Fund is therefore susceptible to political, economic
or regulatory  factors affecting  issuers of  California Municipal  Obligations.
These  include the possible adverse effects of certain California constitutional
amendments, legislative measures, voter initiatives  and other matters that  are
described  below. The following information provides only a brief summary of the
complex factors affecting  the financial situation  in California (the  "State")
and  is derived from sources  that are generally available  to investors and are
believed to  be accurate.  No  independent verification  has  been made  of  the
accuracy  or completeness of  any of the  following information. It  is based in
part on information obtained from various State and local agencies in California
or  contained   in  Official   Statements  for   various  California   Municipal
Obligations.
 
    There  can  be  no  assurance that  future  statewide  or  regional economic
difficulties, and the resulting impact  on State or local governmental  finances
generally,  will not adversely  affect the market  value of California Municipal
Obligations held in the portfolio of the Fund
 
                                       21
<PAGE>
or the ability of particular obligors to make timely payments of debt service on
(or relating to) those obligations.
 
ECONOMIC OVERVIEW
 
    California's economy  is the  largest among  the 50  states and  one of  the
largest  in the  world. The State's  population of almost  32 million represents
12.3% of the total United States population and grew by 27% in the 1980s.  While
the  State's  substantial population  growth during  the 1980s  stimulated local
economic growth and  diversification and  sustained a real  estate boom  between
1984  and 1990, it has increased strains  on the State's limited water resources
and its infrastructure.  Resultant traffic congestion,  school overcrowding  and
high housing costs have increased demands for government services and may impede
future  economic growth. Population growth has slowed between 1991 and 1993 even
while substantial immigration has  continued, due to  a significant increase  in
outmigration  by California residents.  Generally, the household  incomes of new
residents have been substantially lower (and their education and social  service
utilization  higher) than those of departing  households, which may have a major
long-term socioeconomic and fiscal impact. However, with the California  economy
improving,  the recent net outmigration within  the Continental U.S. is expected
to decrease or be reversed.
 
    From mid-1990 to late 1993, the State's economy suffered its worst recession
since the 1930s, with recovery  starting later than for  the nation as a  whole.
The  State  has experienced  the  worst job  losses  of any  post-war recession.
Prerecession job levels may not  be realized until near  the end of the  decade.
The  largest job losses have been in Southern California, led by declines in the
aerospace  and   construction  industries.   Weakness  statewide   occurred   in
manufacturing,  construction,  services  and  trade.  Additional  military  base
closures will have further adverse effects  on the State's economy later in  the
decade.
 
    Since  the start of 1994,  the California economy has  shown signs of steady
recovery and growth.  The State Department  of Finance reports  net job  growth,
particularly  in construction  and related  manufacturing, wholesale  and retail
trade, transportation,  recreation  and services.  This  growth has  offset  the
continuing but slowing job losses in the aerospace industry and restructuring of
the   finance  and  utility   sectors.  Unemployment  in   the  State  was  down
substantially in 1994  from its  10% peak in  January, 1994,  but still  remains
higher  than the national  average rate. Retail  sales were up  strongly in 1994
from year-earlier figures. Delay or  slowdown in recovery will adversely  affect
State revenues.
 
CONSTITUTIONAL LIMITATIONS ON TAXES AND APPROPRIATIONS
 
    LIMITATION  ON  TAXES.  Certain  California  municipal  obligations  may  be
obligations of issuers which rely in  whole or in part, directly or  indirectly,
on  AD  VALOREM property  taxes as  a source  of revenue.  The taxing  powers of
California local governments and districts are  limited by Article XIIIA of  the
California  Constitution, enacted  by the voters  in 1978 and  commonly known as
"Proposition 13." Briefly,  Article XIIIA limits  to 1% of  full cash value  the
rate  of AD VALOREM property taxes on  real property and generally restricts the
reassessment of property to the rate of inflation, not to exceed 2% per year, or
decline in value,  or in the  case of  new construction or  change of  ownership
(subject  to a  number of  exemptions). Taxing  entities may,  however, raise AD
VALOREM taxes above the  1% limit to pay  debt service on voter-approved  bonded
indebtedness.
 
    Under Article XIIIA, the basic 1% AD VALOREM tax levy is applied against the
assessed value of property as of the owner's date of acquisition (or as of March
1,  1975, if acquired earlier), subject  to certain adjustments. This system has
resulted in  widely varying  amounts of  tax on  similarly situated  properties.
Several lawsuits have been filed challenging the
 
                                       22
<PAGE>
acquisition-based  assessment system of Proposition 13  and on June 18, 1992 the
U.S. Supreme Court announced a decision upholding Proposition 13.
 
    Article XIIIA prohibits local governments  from raising revenues through  AD
VALOREM  property  taxes above  the 1%  limit;  it also  requires voters  of any
governmental unit to give two-thirds approval  to levy any "special tax."  Court
decisions,  however, allowed  non-voter approved  levy of  "general taxes" which
were not dedicated to a specific use. In response to these decisions, the voters
of the State in 1986 adopted an initiative statute which imposed significant new
limits on the ability of local entities  to raise or levy general taxes,  except
by  receiving  majority  local  voter  approval.  Significant  elements  of this
initiative, "Proposition 62,"  have been  overturned in recent  court cases.  An
initiative   proposed  to  re-enact  the  provisions  of  Proposition  62  as  a
constitutional amendment was defeated by the voters in November 1990, but such a
proposal may be renewed in the future.
 
    APPROPRIATIONS LIMITS. California and its  local governments are subject  to
an  annual "appropriations  limit" imposed  by Article  XIIIB of  the California
Constitution, enacted  by  the  voters  in 1979  and  significantly  amended  by
Propositions  98 and 111 in 1988 and 1990, respectively. Article XIIIB prohibits
the State or any covered local government from spending "appropriations  subject
to  limitation" in excess  of the appropriations  limit imposed. "Appropriations
subject to limitation" are  authorizations to spend  "proceeds of taxes,"  which
consists  of  tax  revenues and  certain  other funds,  including  proceeds from
regulatory licenses,  user  charges or  other  fees,  to the  extent  that  such
proceeds  exceed the cost of providing the  product or service, but "proceeds of
taxes" excludes most State subventions to local governments. No limit is imposed
on appropriations of funds which are not "proceeds of taxes," such as reasonable
user charges or fees, and certain other non-tax funds, including bond proceeds.
 
    Among the  expenditures not  included in  the Article  XIIIB  appropriations
limit  are (1)  the debt  service cost  of bonds  issued or  authorized prior to
January 1, 1979, or  subsequently authorized by  the voters, (2)  appropriations
arising  from certain emergencies  declared by the  Governor, (3) appropriations
for qualified  capital  outlay projects,  (4)  appropriations by  the  State  of
post-1989  increases  in  gasoline  taxes  and  vehicle  weight  fees,  and  (5)
appropriations made in certain cases of emergency.
 
    The appropriations  limit for  each  year is  adjusted annually  to  reflect
changes  in  cost  of  living  and  population,  and  any  transfers  of service
responsibilities between government units. The definitions for such  adjustments
were liberalized in 1990 to follow more closely growth in California's economy.
 
    "Excess"  revenues are now  measured over a two-year  cycle. With respect to
local governments, excess revenues must be  returned by a revision of tax  rates
or  fee schedules  within the  two subsequent  fiscal years.  The appropriations
limit for  a local  government may  be overridden  by referendum  under  certain
conditions for up to four years at a time. With respect to the State, 50% of any
excess  revenues is  to be  distributed to  K-12 school  districts and community
college districts (collectively, "K-14  districts") and the other  50% is to  be
refunded  to taxpayers. With more liberal  annual adjustment factors since 1988,
and depressed revenues  since 1990  because of the  recession, few  governments,
including  the State,  are currently operating  near their  spending limits, but
this condition may  change over time.  Local governments may  by voter  approval
exceed their spending limits for up to four years.
 
    Because  of the complex nature of Articles XIIIA and XIIIB of the California
Constitution, the ambiguities and possible  inconsistencies in their terms,  and
the  impossibility of predicting future  appropriations or changes in population
and cost of living, and the probability of
 
                                       23
<PAGE>
continuing legal challenges, it is not currently possible to determine fully the
impact of Article XIIIA or Article XIIIB on California Municipal Obligations  or
on  the ability of California  or local governments to  pay debt service on such
California Municipal Obligations. It  is not presently  possible to predict  the
outcome  of any pending litigation with respect to the ultimate scope, impact or
constitutionality of either Article XIIIA or Article XIIIB, or the impact of any
such determinations  upon State  agencies or  local governments,  or upon  their
ability  to  pay  debt  service  on  their  obligations.  Future  initiatives or
legislative changes in laws or the  California Constitution may also affect  the
ability of the State or local issuers to repay their obligations.
 
    OBLIGATIONS  OF THE STATE OF  CALIFORNIA. Under the California Constitution,
debt service on outstanding general obligation bonds is the second charge to the
General Fund after support of the  public school system and public  institutions
of  higher  education.  Total  outstanding  general  obligation  bond  and lease
purchase debt of the State increased from $9.4 billion at June 30, 1987 to $23.5
billion at June 30, 1994. In FY1993-94, debt service on general obligation bonds
and lease purchase debt was approximately 5.2% of General Fund revenues.
 
    RECENT FINANCIAL RESULTS. The principal sources of General Fund revenues  in
1992-93  were the  California personal income  tax (44% of  total revenues), the
sales tax (38%), bank and corporation taxes (12%), and the gross premium tax  on
insurance  (3%). California maintains a  Special Fund for Economic Uncertainties
(the "Economic Uncertainties Fund"),  derived from General  Fund revenues, as  a
reserve to meet cash needs of the General Fund.
 
    GENERAL.  Throughout  the 1980's,  State spending  increased rapidly  as the
State population and economy also grew rapidly, including increased spending for
many assistance  programs  to  local  governments,  which  were  constrained  by
Proposition  13 and other laws. The largest State program is assistance to local
public school districts.  In 1988,  an initiative (Proposition  98) was  enacted
which  (subject to suspension  by a two-thirds  vote of the  Legislature and the
Governor) guarantees local  school districts and  community college districts  a
minimum share of State General Fund revenues (currently about 33%).
 
    Since  the  start  of  1990-91  Fiscal Year,  the  State  has  faced adverse
economic, fiscal,  and  budget  conditions.  The  economic  recession  seriously
affected  State tax revenues.  It also caused  increased expenditures for health
and welfare programs.  The State is  also facing a  structural imbalance in  its
budget  with  the largest  programs supported  by  the General  Fund (education,
health, welfare and corrections) growing at  rates higher than the growth  rates
for the principal revenue sources of the General Fund. These structured concerns
will  be  exacerbated in  coming  years by  the  expected need  to substantially
increase capital and  operating funds for  corrections as a  result of a  "Three
Strikes"  law enacted in 1994. As a result, the State entered a period of budget
imbalance, with  expenditures exceeding  revenues for  four of  the five  fiscal
years  ending in 1991-92; revenues and expenditures were about equal in 1992-93.
By June 30,  1993, the State's  General Fund  had an accumulated  deficit, on  a
budget basis, of approximately $2.8 billion.
 
    RECENT  BUDGETS. The  state failed  to enact its  1992-93 budget  by July 1,
1992. Although the  State had no  legal authority  to pay many  of its  vendors,
certain  obligations  (such  as  debt  service,  school  apportionments, welfare
payments, and employee salaries) were  payable because of continuing or  special
appropriations,  or court  orders. However,  the State  Controller did  not have
enough cash to pay as they came due all of these ongoing obligations, as well as
valid obligations incurred in the prior fiscal year.
 
                                       24
<PAGE>
    Starting on July 1, 1992, the  Controller was required to issue  "registered
warrants"  in  lieu  of  normal  warrants  backed  by  cash  to  pay  many State
obligations. Available  cash  was  used to  pay  constitutionally  mandated  and
priority  obligations.  Between July  1 and  September  3, 1992,  the Controller
issued an aggregate of approximately $3.8 billion of registered warrants all  of
which were called for redemption by September 4, 1992 following enactment of the
1992-93 Budget Act and issuance by the State of short-term notes.
 
    The 1992-93 Budget Act, when finally adopted, was projected to eliminate the
State's accumulated deficit, with additional expenditure cuts and a $1.3 billion
transfer of State education funding costs to local governments by shifting local
property  taxes to school districts. However,  as the recession continued longer
and deeper than expected,  revenues once again were  far below projections,  and
only  reached a level just equal to  the amount of expenditures. Thus, the State
continued to carry its $2.8 billion budget deficit at June 30, 1993.
 
    The 1993-94 Budget  Act represented  a third consecutive  year of  difficult
budget  choices. As in the prior year, the budget contained no general state tax
increases, and relied principally on  expenditure cuts, particularly for  health
and  welfare and  higher education,  a two-year  suspension of  the renters' tax
credit, some one-time and accounting  adjustments, and -- the largest  component
- --  an additional $2.6 billion transfer of property taxes from local government,
particularly counties, to  school districts  to reduce  State education  funding
requirements.  A temporary state sales tax scheduled  to expire on June 30, 1993
was extended for six  months, and dedicated to  support local government  public
safety costs.
 
    A  major  feature  of  the  budget was  a  two-year  plan  to  eliminate the
accumulated deficit  by  borrowing  into  the  1994-95  fiscal  year.  With  the
recession  still  continuing longer  than expected,  the  General Fund  had $800
million less revenue and  $800 million higher expenditures  than budgeted. As  a
result  revenues only exceed  expenditures by about  $500 million. However, this
was the  first operating  surplus  in four  years  and reduced  the  accumulated
deficit  to $2.0 billion at June 30, 1994 (after taking account of certain other
accounting reserves).
 
    CURRENT BUDGET.  The 1994-95  Budget Act  was passed  on July  8, 1994,  and
provides  for an  estimated $41.9  billion of  General Fund  revenues, and $40.9
billion of expenditures. The budget assumed receipt of about $750 million of new
federal assistance for the costs of incarceration, education, health and welfare
related to undocumented immigrants. Other major components of the budget include
further reductions  in health  and welfare  costs and  miscellaneous  government
costs,  some additional transfers of funds from  local government, and a plan to
defer retirement of $1 billion of the accumulated budget deficit to the  1995-96
fiscal  year. The federal government has apparently budgeted only $33 million of
the expected immigration aid. However, this  shortfall is expected to be  almost
fully  offset  by  higher  than projected  revenues,  and  lower  than projected
caseload growth, as the economy improves.
 
    The State issued $7.0 billion of short-term  debt in July, 1994 to meet  its
cash  flow needs and to  finance the deferral of  part of the accumulated budget
deficit to the  1995-96 fiscal  year. In  order to  assure repayment  of the  $4
billion,  22-month part  of this borrowing,  the State  enacted legislation (the
"Trigger Law") which  can lead  to automatic, across-the-board  cuts in  General
Fund  expenditures in either  the 1994-95 or  1995-96 fiscal years  if cash flow
projections made at certain times during those years show deterioration from the
projections made in  July 1994 when  the borrowings were  made. On November  15,
1994,  the State Controller  as part of  the Trigger Law  reported that the cash
position of the General Fund on
 
                                       25
<PAGE>
June 30, 1995 would be about $580  million better than earlier projected, so  no
automatic  budget adjustments were required  in 1994-95. The Controller's report
showed that  loss  of  federal  funds  was  offset  by  higher  revenues,  lower
expenditures, and certain other increases in cash resources.
 
    PROPOSED  1995-96 BUDGET.   On January 10, 1995,  the Governor presented his
proposed FY 1995-96 Budget. This budget projects total General Fund revenues and
transfers of $42.5 billion, and expenditures  of $41.7 billion, to complete  the
elimination  of  the  accumulated  deficits from  earlier  years.  However, this
proposal leaves no  cushion, as the  projected budget reserve  at June 30,  1996
would  be  only about  $92  million. While  proposing  increases in  funding for
schools, universities and  corrections, the  Governor proposes  further cuts  in
welfare  programs, and  a continuation  of the  "realignment" of  functions with
counties which  would save  the  State about  $240  million. The  Governor  also
expects  about  $800  million  in  new federal  aid  for  the  State's  costs of
incarcerating and educating  illegal immigrants. The  Budget proposal also  does
not  account for  possible additional  costs if the  State loses  its appeals on
lawsuits which are currently pending  concerning such matters as school  funding
and  pension payments,  but these appeals  could take several  years to resolve.
Part of  the Governor's  proposal  also is  a 15%  cut  in personal  income  and
corporate  taxes, to be phased in over  three years, starting with calendar year
1996 (which would have only a small impact on 1995-96 income).
 
    The State's  difficult  financial condition  for  the current  and  upcoming
budget   years  will  result  in  continued   pressure  upon  almost  all  local
governments, particularly school  districts and counties  which depend on  State
aid.  Despite efforts in recent years  to increase taxes and reduce governmental
expenditures, there can be no assurance that the State will not face budget gaps
in the future.
 
    BOND RATING.   State general obligation bonds ratings were reduced in  July,
1994  to "A1" by Moody's and "A" by S&P. Both of these ratings were reduced from
"AAA" levels which the  State held until  late 1991. There  can be no  assurance
that  such ratings will be maintained in the future. It should be noted that the
creditworthiness of  obligations  issued  by local  California  issuers  may  be
unrelated  to  the  creditworthiness  of  obligations  issued  by  the  State of
California, and that there  is no obligation  on the part of  the State to  make
payment on such local obligations in the event of default.
 
    LEGAL  PROCEEDINGS.   The  State is  involved  in certain  legal proceedings
(described in the State's recent financial statements) that, if decided  against
the  State, may require the State to make significant future expenditures or may
substantially impair  revenues. Trial  courts  have recently  entered  tentative
decisions  or  injunctions which  would overturn  several  parts of  the state's
recent budget  compromises. The  matters  covered by  these lawsuits  include  a
deferral  of payments  by the State  to the Public  Employees Retirement System,
reductions in welfare payments, and the  use of certain cigarette tax funds  for
health costs. All of these cases are subject to further proceedings and appeals,
and  if  the State  eventually  loses, the  final remedies  may  not have  to be
implemented in one year.
 
OBLIGATIONS OF OTHER ISSUERS
 
    OTHER ISSUERS OF  CALIFORNIA MUNICIPAL  OBLIGATIONS. There are  a number  of
state  agencies, instrumentalities and political  subdivisions of the State that
issue Municipal Obligations, some  of which may  be conduit revenue  obligations
payable  from payments  from private  borrowers. These  entities are  subject to
various economic  risks  and  uncertainties,  and  the  credit  quality  of  the
securities  issued by them may vary considerably  from the credit quality of the
obligations backed by the full faith and credit of the State.
 
                                       26
<PAGE>
    STATE ASSISTANCE.  Property  tax  revenues  received  by  local  governments
declined  more than 50%  following passage of  Proposition 13. Subsequently, the
California Legislature enacted measures to provide for the redistribution of the
State's General  Fund surplus  to local  agencies, the  reallocation of  certain
State  revenues to  local agencies  and the  assumption of  certain governmental
functions by the State  to assist municipal issuers  to raise revenues.  Through
1990-91, local assistance (including public schools) accounted for approximately
75%  of General Fund spending.  To reduce State General  Fund support for school
districts, the  1992-93 and  1993-94  Budget Acts  caused local  governments  to
transfer $3.9 billion of property tax revenues to school districts, representing
loss of all of the post-Proposition 13 "bailout" aid. The largest share of these
transfers came from counties, and the balance from cities, special districts and
redevelopment  agencies. In  order to  make up  this shortfall,  the Legislature
proposed and  voters  approved in  1993  dedicating 0.5%  of  the sales  tax  to
counties and cities for public safety purposes. In addition, the Legislature has
changed  laws to relieve local governments of certain mandates, allowing them to
reduce costs.
 
    To the  extent  the  State  should  be  constrained  by  its  Article  XIIIB
appropriations  limit, or its obligation to  conform to Proposition 98, or other
fiscal considerations,  the absolute  level, or  the rate  of growth,  of  State
assistance to local governments may be reduced. Any such reductions in State aid
could  compound the serious fiscal constraints already experienced by many local
governments, particularly counties. At least  one rural county (Butte)  publicly
announced  that it might  enter bankruptcy proceedings  in August 1990, although
such plans  were put  off after  the Governor  approved legislation  to  provide
additional  funds for the county. Other  counties have also indicated that their
budgetary condition is  extremely grave.  The Richmond  Unified School  District
(Contra  Costa  County)  entered  bankruptcy proceedings  in  May  1991  but the
proceedings have been dismissed.
 
    ASSESSMENT BONDS.  California  Municipal Obligations  which  are  assessment
bonds  may be adversely affected by a general decline in real estate values or a
slowdown in real estate sales activity. In many cases, such bonds are secured by
land which  is  undeveloped  at the  time  of  issuance but  anticipated  to  be
developed  within a few years after issuance.  In the event of such reduction or
slowdown, such development may not occur  or may be delayed, thereby  increasing
the  risk of a  default on the  bonds. Because the  special assessments or taxes
securing these  bonds  are not  the  personal liability  of  the owners  of  the
property  assessed, the lien on the property is the only security for the bonds.
Moreover, in  most cases  the issuer  of these  bonds is  not required  to  make
payments  on the bonds in the event of delinquency in the payment of assessments
or taxes, except from  amounts, if any,  in a reserve  fund established for  the
bonds.
 
    CALIFORNIA  LONG-TERM LEASE OBLIGATIONS.  Certain California long-term lease
obligations, though typically payable from the general fund of the municipality,
are subject to "abatement" in the event the facility being leased is unavailable
for beneficial use  and occupancy  by the municipality  during the  term of  the
lease. Abatement is not a default, and there may be no remedies available to the
holders  of  the  certificates  evidencing the  lease  obligation  in  the event
abatement occurs. The  most common cases  of abatement are  failure to  complete
construction  of the facility  before the end  of the period  during which lease
payments have been  capitalized and  uninsured casualty losses  to the  facility
(E.G., due to earthquake). In the event abatement occurs with respect to a lease
obligation,  lease  payments  may  be interrupted  (if  all  available insurance
proceeds and reserves are exhausted) and  the certificates may not be paid  when
due.
 
                                       27
<PAGE>
    Several  years  ago the  Richmond Unified  School District  (the "District")
entered into a  lease transaction in  which certain existing  properties of  the
District  were sold and leased back in  order to obtain funds to cover operating
deficits. Following a fiscal crisis in which the District's finances were  taken
over  by  a State  receiver  (including a  brief  period under  bankruptcy court
protection), the  District  failed  to  make  rental  payments  on  this  lease,
resulting  in  a lawsuit  by the  Trustee for  the Certificate  of Participation
holders, in  which the  State was  a named  defendant (on  the grounds  that  it
controlled  the District's  finances). One of  the defenses raised  in answer to
this lawsuit was  the invalidity of  the District's lease.  The trial court  has
upheld  the validity of  the lease and  the case has  been settled. Any ultimate
judgment in any future case against the position asserted by the Trustee in  the
Richmond  case may have adverse implications for lease transactions of a similar
nature by other California entities.
 
    OTHER CONSIDERATIONS.  The repayment  of industrial  development  securities
secured by real property may be affected by California laws limiting foreclosure
rights  of creditors. Securities backed by health care and hospital revenues may
be affected by  changes in  State regulations governing  cost reimbursements  to
health  care providers under Medi-Cal  (the State's Medicaid program), including
risks  related  to  the  policy  of  awarding  exclusive  contracts  to  certain
hospitals.
 
    Limitations  on  AD  VALOREM  property taxes  may  particularly  affect "tax
allocation" bonds issued  by California redevelopment  agencies. Such bonds  are
secured  solely by the increase in assessed valuation of a redevelopment project
area after  the start  of redevelopment  activity. In  the event  that  assessed
values  in the redevelopment  project decline (E.G., because  of a major natural
disaster such as an earthquake), the  tax increment revenue may be  insufficient
to  make principal and  interest payments on  these bonds. Both  Moody's and S&P
suspended ratings  on California  tax allocation  bonds after  the enactment  of
Articles XIIIA and XIIIB, and only resumed such ratings on a selective basis.
 
    Proposition  87, approved  by California voters  in 1988,  requires that all
revenues produced by a tax rate increase go directly to the taxing entity  which
increased  such tax rate to repay that entity's general obligation indebtedness.
As a result, redevelopment  agencies (which, typically, are  the issuers of  tax
allocation securities) no longer receive an increase in tax increment when taxes
on  property in  the project area  are increased to  repay voter-approved bonded
indebtedness.
 
    The effect of these  various constitutional and  statutory changes upon  the
ability of California municipal securities issuers to pay interest and principal
on  their obligations remains unclear. Furthermore, other measures affecting the
taxing or spending authority of California or its political subdivisions may  be
approved  or enacted in  the future. Legislation  has been or  may be introduced
which would modify  existing taxes  or other revenue-raising  measures or  which
either  would further limit  or, alternatively, would  increase the abilities of
state and local governments to impose  new taxes or increase existing taxes.  It
is  not presently possible to  predict the extent to  which any such legislation
will be enacted. Nor  is it presently  possible to determine  the impact of  any
such  legislation  on California  Municipal Obligations  in  which the  Fund may
invest, future  allocations  of  state  revenues to  local  governments  or  the
abilities  of state or  local governments to  pay the interest  on, or repay the
principal of, such California Municipal Obligations.
 
    Substantially all of California is within an active geologic region  subject
to  major seismic activity. Northern California  in 1989 and Southern California
in 1994 experienced major  earthquakes causing billions  of dollars in  damages.
The federal government provided more
 
                                       28
<PAGE>
than  $13 billion in aid for both  earthquakes, and neither event is expected to
have any long-term negative economic impact. Any California Municipal Obligation
in the California Insured Trust could be affected by an interruption of revenues
because of  damaged  facilities, or,  consequently,  income tax  deductions  for
casualty  losses or  property tax assessment  reductions. Compensatory financial
assistance could  be constrained  by the  inability  of (i)  an issuer  to  have
obtained  earthquake insurance coverage at reasonable  rates; (ii) an insurer to
perform on its  contracts of  insurance in the  event of  widespread losses;  or
(iii)  the Federal  or State government  to appropriate  sufficient funds within
their respective budget limitations.
 
    On January 17, 1994, a major  earthquake with an estimated magnitude of  6.8
on  the Richter scale struck the  Los Angeles area, causing significant property
damage to public and private facilities, presently estimated at $15-20  billion.
While  over $9.5 billion of  federal aid, and a  projected $1.9 billion of State
aid, plus insurance proceeds,  will reimburse much of  that loss, there will  be
some  ultimate loss of wealth and income in  the region, in addition to costs of
the  disruption  caused  by  the  event.  Short-term  economic  projections  are
generally  neutral, as the infusion  of aid will restore  billions of dollars to
the local economy within a few  months; already the local construction  industry
has  picked up. Although the earthquake  will hinder recovery from the recession
in Southern California, already hard-hit,  its long-term impact is not  expected
to  be material in the context of the  overall wealth of the region. Almost five
years after the event, there are few  remaining effects of the 1989 Loma  Prieta
earthquake  in northern  California (which,  however, caused  less severe damage
than Northridge).
 
    On December 7, 1994, Orange County, California (the "County"), together with
its pooled  investment  fund (the  "Pooled  Fund") filed  for  protection  under
Chapter 9 of the federal Bankruptcy Code, after reports that the Pooled Fund had
suffered  significant market losses in its investments caused a liquidity crisis
for the Pooled Fund and  the County. More than  180 other public entities,  most
but  not all located in the County, were  also depositors in the Pooled Fund. As
of mid-January, 1995, the County estimated the Pooled Fund's loss at about $1.64
billion of its initial deposits of around $7.5 billion. The Pooled Fund has been
almost completely restructured  to reduce  its exposure to  changes in  interest
rates.  Many of the entities which kept moneys in the Pooled Fund, including the
County, are facing cash flow difficulties  because of the bankruptcy filing  and
may  be required to reduce programs or  capital projects. The County and some of
these entities have, and others may in  the future, default in payment of  their
obligations.  Moody's and  Standard &  Poor's have  suspended, reduced  to below
investment grade levels, or placed on  "Credit Watch" various securities of  the
County and the entities participating in the Pooled Fund.
 
    The State of California has no obligation with respect to any obligations or
securities  of the County  or any of the  other participating entities, although
under existing  legal precedents,  the State  may be  obligated to  ensure  that
school districts have sufficient funds to operate.
 
                                       29
<PAGE>
CALIFORNIA TAXABLE ESTIMATED CURRENT RETURN TABLE
 
    The  following tables show the approximate taxable estimated current returns
for individuals  that are  equivalent to  tax-exempt estimated  current  returns
under  combined Federal and  state taxes, using  published 1995 marginal Federal
tax rates and marginal state tax  rates currently available and scheduled to  be
in  effect.  The  tables  incorporate  increased  tax  rates  for  higher-income
taxpayers that were  included in  the Revenue  Reconciliation Act  of 1993.  For
cases  in which more than one state  bracket falls within a Federal bracket, the
highest state bracket is combined with  the Federal bracket. The combined  state
and  Federal tax  brackets shown  reflect the fact  that state  tax payments are
currently deductible for Federal  tax purposes. The  tables illustrate what  you
would  have to  earn on  taxable investments  to equal  the tax-exempt estimated
current return for your  income tax bracket. A  taxpayer's marginal tax rate  is
affected  by both his taxable income and  his adjusted gross income. Locate your
adjusted gross and  your taxable  income (which  is your  adjusted gross  income
reduced by any deductions and exemptions), then locate your tax bracket based on
joint  or single  tax filing.  Read across  to the  equivalent taxable estimated
current return you would need to match the tax-free income.
 
 COMBINED MARGINAL TAX RATES FOR JOINT TAXPAYERS WITH FOUR PERSONAL EXEMPTIONS
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL
    FEDERAL      ADJUSTED      COMBINED
    TAXABLE        GROSS      STATE* AND                   TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME        FEDERAL       --------------------------------------------------------------
   (1,000'S)     (1,000'S)     TAX RATE1      5.00%   5.25%   5.50%   5.75%   6.00%   6.25%   6.50%   6.75%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 39.0 $     0-114.7      20.0   %     6.25    6.56    6.88    7.19    7.50    7.81    8.13    8.44
    39.0- 94.3       0-114.7      34.5         7.63    8.02    8.40    8.78    9.16    9.54    9.92   10.31
                 114.7-172.1      35.5         7.75    8.14    8.53    8.91    9.30    9.69   10.08   10.47
    94.3-143.6       0-114.7      37.5         8.00    8.40    8.80    9.20    9.60   10.00   10.40   10.80
                 114.7-172.1      38.5         8.13    8.54    8.94    9.35    9.76   10.16   10.57   10.98
                 172.1-214.9      40.5         8.40    8.82    9.24    9.66   10.08   10.50   10.92   11.34
   143.6-214.9   114.7-172.1      43.0         8.77    9.21    8.77    9.21    9.65   10.09   10.53   10.96
                 172.1-214.9      45.5         9.17    9.63   10.09   10.55   11.01   11.47   11.93   12.39
                 214.9-239.9      46.5         9.35    9.81   10.28   10.75   11.21   11.68   12.15   12.62
                 239.9-294.6      46.0         9.26    9.72   10.19   10.65   11.11   11.57   12.04   12.50
                  Over 294.6      43.5   2     8.85    9.29    9.73   10.18   10.62   11.06   11.50   11.95
   214.9-256.5   172.1-214.9      46.0         9.26    9.72   10.19   10.65   11.11   11.57   12.04   12.50
                 214.9-239.9      47.0         9.43    9.91   10.38   10.85   11.32   11.79   12.26   12.74
                 239.9-294.6      46.5         9.35    9.81   10.28   10.75   11.21   11.68   12.15   12.62
                  Over 294.6      44.0   2     8.93    9.38    9.82   10.27   10.71   11.16   11.61   12.05
   256.5-429.9   239.9-294.6      50.0        10.00   10.50   11.00   11.50   12.00   12.50   13.00   13.50
                  Over 294.6      47.0   3     9.43    9.91   10.38   10.85   11.32   11.79   12.26   12.74
    Over 429.9    Over 294.6      47.5   3     9.52   10.00   10.48   10.95   11.43   11.90   12.38   12.86
</TABLE>
 
                                       30
<PAGE>
  COMBINED MARGINAL TAX RATES FOR SINGLE TAXPAYERS WITH ONE PERSONAL EXEMPTION
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL
    FEDERAL      ADJUSTED      COMBINED
    TAXABLE        GROSS      STATE* AND                   TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME        FEDERAL       --------------------------------------------------------------
   (1,000'S)     (1,000'S)     TAX RATE1      5.00%   5.25%   5.50%   5.75%   6.00%   6.25%   6.50%   6.75%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 23.4 $     0-107.5      20.0   %     6.25    6.56    6.88    7.19    7.50    7.81    8.13    8.44
    23.4- 56.6       0-107.5      34.5         7.63    8.02    8.40    8.78    9.16    9.54    9.92   10.31
    56.6-107.5       0-107.5      37.5         8.00    8.40    8.80    9.20    9.60   10.00   10.40   10.80
                 107.5-114.7      38.0         8.06    8.47    8.87    9.27    9.68   10.08   10.48   10.89
                 114.7-132.5      39.5         8.26    8.68    9.09    9.50    9.92   10.33   10.74   11.16
                 132.5-237.2      39.0         8.20    8.61    9.02    9.43    9.84   10.25   10.66   11.07
   107.5-118.0       0-107.5      38.0         8.06    8.47    8.87    9.27    9.68   10.08   10.48   10.89
                 107.5-114.7      38.5         8.13    8.54    8.94    9.35    9.76   10.16   10.57   10.98
                 114.7-132.5      40.0         8.33    8.75    9.17    9.58   10.00   10.42   10.83   11.25
                 132.5-237.2      39.5         8.26    8.68    9.09    9.50    9.92   10.33   10.74   11.16
   118.0-214.9   114.7-132.5      44.5         9.01    9.46    9.91   10.36   10.81   11.26   11.71   12.16
                 132.5-237.2      44.5         9.01    9.46    9.91   10.36   10.81   11.26   11.71   12.16
                  Over 237.2      44.0   2     8.93    9.38    9.82   10.27   10.71   11.16   11.61   12.05
   214.9-256.5   132.5-237.2      45.0         9.09    9.55   10.00   10.45   10.91   11.36   11.82   12.27
                  Over 237.2      44.5   2     9.01    9.46    9.91   10.36   10.81   11.26   11.71   12.16
    Over 256.5    Over 237.2      47.5   3     9.52   10.00   10.48   10.95   11.43   11.90   12.38   12.86
<FN>
- ------------------
    * The State tax rates assumed take into account the adjustment  of tax brackets based on changes in the Consumer Price  Index
for 1994.
      1  The table reflects the effect of the limitations on  itemized deductions and the deduction for personal exemptions. They
were designed to phase out certain benefits of these deductions for higher income taxpayers. These limitations, in effect,  raise
the  current maximum marginal Federal tax rate to approximately 44.0  percent for taxpayers filing a joint return and entitled to
four personal exemptions and to  approximately 41.0 percent for  taxpayers filing a single return  entitled to only one  personal
exemption.  These limitations are  subject to certain maximums,  which depend on  the number of exemptions  claimed and the total
amount of the taxpayer's itemized  deductions. For example, the  limitation on itemized deductions will  not cause a taxpayer  to
lose  more than 80% of his allowable itemized deductions, with  certain exceptions. The table also reflects California income tax
laws that increase state income tax rates for high income  taxpayers, limit itemized deductions and phase out the benefit of  the
personal exemption credit and the dependent exemption credit in a manner similar to Federal tax law.
      2  Federal tax rate reverts to 36.0% and the state tax rate reverts to the applicable stated maximum rate after the 80% cap
on the limitation on itemized deductions, under federal or state law, as appropriate has been met.
      3 Federal tax rate reverts to 39.6% after the 80% cap on the limitation on itemized deductions has been met.
</TABLE>
 
    A comparison of  tax-free and equivalent  taxable estimated current  returns
with  the returns on various  taxable investments is one  element to consider in
making an  investment  decision.  The Sponsor  may  from  time to  time  in  its
advertising  and sales materials  compare the then  current estimated returns on
the Trust and returns over specified periods on other similar Nuveen Trusts with
returns on taxable investments such as corporate or U.S. Government bonds,  bank
CD's  and  money  market accounts  or  money  market funds,  each  of  which has
investment characteristics  that  may  differ  from those  of  the  Trust.  U.S.
Government  bonds, for example, are  backed by the full  faith and credit of the
U.S. Government and bank CD's and money market accounts are insured by an agency
of the federal government. Money market accounts and money market funds  provide
stability  of principal, but pay interest at  rates that vary with the condition
of the short-term debt market. The  investment characteristics of the Trust  are
described more fully elsewhere in this Prospectus.
 
                                       31
<PAGE>
   
NUVEEN TAX-EXEMPT UNIT TRUST
SCHEDULE OF INVESTMENTS AT DATE OF DEPOSIT
FEBRUARY 23, 1995
CALIFORNIA INSURED TRUST 243
(SERIES 786)
    
 
<TABLE>
<CAPTION>
                                                                                          Ratings(3)           Trustee's
                                                                      Optional       ---------------------   Determination
 Aggregate        Name of Issuer and Title of Issue Represented      Redemption       Standard                of Offering
  Principal        by Sponsor's Contracts to Purchase Bonds(1)      Provisions(2)     & Poor's    Moody's      Price(4)
<C>          <C> <S>                                              <C>                <C>         <C>        <C>
- ---------------------------------------------------------------------------------------------------------------------------
$   600,000      California Health Facilities Financing              2003 at 102        AAA         Aaa     $       547,512
                   Authority, Kaiser Permanente, Revenue Bonds,
                   1993 Series C, 5.60% Due 5/1/33.
    600,000      State Public Works Board of the State of            2004 at 102        AAA         Aaa             547,584
                   California, Lease Revenue Bonds (Department
                   of Corrections), 1993 Series E (California
                   State Prison-Madera County (II)), 5.50% Due
                   6/1/19.
    500,000      California State University, Fresno                 2005 at 101        AAA         Aaa             505,000
                   Association, Inc., Auxiliary Organization
                   Revenue Bonds (Student Residence Project),
                   Series 1995, 6.25% Due 2/1/17.
    600,000      The Regents of the University of California,        2003 at 102        AAA         Aaa             596,250
                   Refunding Revenue Bonds (Multiple Purpose
                   Projects), Series B, 6.00% Due 9/1/13.
    600,000      Los Angeles Convention and Exhibition Center        2003 at 102        AAA         Aaa             539,184
                   Authority (California), Lease Revenue Bonds,
                   1993 Refunding Series A, 5.375% Due 8/15/18.
    600,000      Department of Water and Power of The City of        2003 at 102        AAA         Aaa             572,130
                   Los Angeles (California), Electric Plant
                   Refunding Revenue Bonds, Issue of 1993,
                   5.875% Due 9/1/30.
    500,000      Commonwealth of Puerto Rico, Public Improvement   2004 at 101 1/2      AAA         Aaa             516,165
                   Bonds of 1994 (General Obligation Bonds),
                   6.50% Due 7/1/23.
- -----------                                                                                                 ---------------
$ 4,000,000                                                                                                 $     3,823,825
- -----------                                                                                                 ---------------
- -----------                                                                                                 ---------------
</TABLE>
 
See Notes to Schedules of Investments, page 33.
 
                                       32
<PAGE>
NOTES TO SCHEDULES OF INVESTMENTS
 
    (1) Contracts,  which  are  "when-issued"  or  "regular  way"  contracts  or
        contracts having delivery dates beyond the normal settlement date,  have
        been  deposited with the Trustee on the Date of Deposit. The performance
        of such contracts is secured by an irrevocable letter of credit,  issued
        by  a major commercial bank, which  has been deposited with the Trustee.
        At the Date  of Deposit, Bonds  may have been  delivered to the  Sponsor
        pursuant  to certain of these contracts; the Sponsor has assigned to the
        Trustee all of its right, title and interest in and to such Bonds.
 
    (2) The Bonds are first subject to optional redemption in the years, and  at
        the  prices, shown.  Unless otherwise  indicated, the  Bonds, except for
        Bonds issued at a substantial original issue discount, are redeemable at
        declining prices (but not below par value) in subsequent years. Original
        issue  discount  bonds,  including  zero  coupon  bonds,  are  generally
        redeemable  at  prices  based on  the  issue  price plus  the  amount of
        original issue discount accreted to redemption plus, if applicable, some
        premium, the amount of which will decline in subsequent years. The Bonds
        may also be subject to sinking fund redemption without premium prior  to
        the dates shown.
 
        Certain  Bonds may be subject to redemption without premium prior to the
        date shown  pursuant  to  special  or  mandatory  call  provisions;  for
        example,  if bond proceeds are not able  to be used as contemplated, the
        project is condemned or sold, or the project is destroyed and  insurance
        proceeds  are used to  redeem the bonds.  Single family mortgage revenue
        bonds and housing authority bonds are  most likely to be called  subject
        to  such provisions, but other bonds may have similar call features. See
        Section 4 and "General Trust Information" in this Section.
 
        The Trustee's determination of the offering prices of Bonds in the  Fund
        may  be  greater or  less than  the  amounts that  may be  received upon
        redemption or  maturity  of  such Bonds.  Subject  to  rules  concerning
        amortization  of bond  premium and of  original issue  discount, gain or
        loss realized  by  the Trustee  on  disposition  of any  Bonds  will  be
        recognized  as taxable capital gain or loss by Unitholders. (See Section
        4.)
 
    (3) See "Description  of  Ratings" herein.  All  the Bonds  in  the  Insured
        Trusts,  as insured by the  Insurer, are rated AAA  by Standard & Poor's
        Corporation and Aaa by Moody's Investors Service, Inc. (See Section 5.)
 
    (4) As determined by  Kenny S&P  Evaluation Services,  a division  of J.  J.
        Kenny Co., Inc., on behalf of the Trustee as of the close of business on
        the business day preceding the Date of Deposit. The prices as determined
        by  Kenny S&P Evaluation Services, a division  of J. J. Kenny Co., Inc.,
        have been rounded to the nearest dollar.
 
                                       33
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
   
     TO THE  BOARD OF  DIRECTORS  OF JOHN  NUVEEN  & CO.  INCORPORATED  AND
     UNITHOLDERS OF NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 786:
    
 
   
       We  have audited  the accompanying  statements of  condition and the
     related schedules of investments at  date of deposit (included in  the
     prospectus  herein)  of  Nuveen  Tax-Exempt  Unit  Trust,  Series  786
     (comprising Maryland Traditional Trust 304, National Insured Trust 291
     and California  Insured Trust  243), as  of February  23, 1995.  These
     financial  statements  are  the  responsibility  of  the  Sponsor. Our
     responsibility is to express an opinion on these financial  statements
     based on our audits.
    
 
       We  conducted  our  audits  in  accordance  with  generally accepted
     auditing standards. Those standards 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.  Our  procedures  included
     confirmation  of the irrevocable letter  of credit arrangement for the
     purchase of securities,  described in  Note (1) to  the statements  of
     condition,  by correspondence with the Trustee. An audit also includes
     assessing the  accounting principles  used and  significant  estimates
     made  by  the Sponsor,  as well  as  evaluating the  overall financial
     statement  presentation.  We  believe   that  our  audits  provide   a
     reasonable basis for our opinion.
 
   
       In  our  opinion,  the  statements  of  condition  and  the  related
     schedules of investments at date of deposit referred to above  present
     fairly,  in all material  respects, the financial  position of each of
     the trusts constituting the Nuveen  Tax-Exempt Unit Trust, Series  786
     as  of  February  23,  1995,  in  conformity  with  generally accepted
     accounting principles.
    
 
                                                        ARTHUR ANDERSEN LLP
 
   
     Chicago, Illinois,
     February 23, 1995.
    
 
                                       34
<PAGE>
                            Statements of Condition
 
   
                    NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 786
    
 
   
   (Maryland Traditional Trust 304, National Insured Trust 291 and California
                               Insured Trust 243)
    
   
                            AS OF FEBRUARY 23, 1995
    
 
<TABLE>
<CAPTION>
                                             MARYLAND            NATIONAL           CALIFORNIA
                                            TRADITIONAL           INSURED             INSURED
    TRUST PROPERTY                           TRUST 304           TRUST 291           TRUST 243
<S>                                       <C>                 <C>                 <C>
                                          ---------------     ---------------     ---------------
Sponsor's contracts to purchase
 Tax-Exempt Bonds, backed by an
 irrevocable letter of credit(1)(2).....  $     3,304,615     $     9,680,204     $     3,823,825
Accrued interest to February 23, 1995 on
  underlying Bonds(1)...................           37,486             131,586              59,333
                                          ---------------     ---------------     ---------------
            Total.......................  $     3,342,101     $     9,811,790     $     3,883,158
                                          ---------------     ---------------     ---------------
                                          ---------------     ---------------     ---------------
   LIABILITY AND INTEREST OF UNITHOLDERS
LIABILITY:
    Accrued interest to February 23,
      1995 on underlying Bonds(3).......  $        37,486     $       131,586     $        59,333
                                          ---------------     ---------------     ---------------
INTEREST OF UNITHOLDERS:
    Units of fractional undivided
      interest outstanding (Maryland
      Traditional Trust 304 --35,000;
      National Insured Trust 291--
      100,000; California Insured Trust
      243-- 40,000)
      Cost to investors(4)..............  $     3,474,869     $    10,178,928     $     4,020,828
        Less: Gross underwriting
          commission(5).................         (170,254)           (498,724)           (197,003)
                                          ---------------     ---------------     ---------------
    Net amount applicable to
      investors.........................  $     3,304,615     $     9,680,204     $     3,823,825
                                          ---------------     ---------------     ---------------
            Total.......................  $     3,342,101     $     9,811,790     $     3,883,158
                                          ---------------     ---------------     ---------------
                                          ---------------     ---------------     ---------------
<FN>
(1) Represented by contracts  to purchase Tax-Exempt  Bonds which include "when  issued" or "regular  way" or "delayed  delivery"
    contracts  for which an irrevocable letter of  credit issued by a major commercial  bank has been deposited with the Trustee.
    The amount of such letter of credit  and any cash deposited exceeds the amount  necessary for the purchase of the Bonds  plus
    accrued  interest to the Date of  Deposit. At the Date of  Deposit, Bonds may have been  delivered to the Sponsor pursuant to
    certain of these contracts; the  Sponsor has assigned to  the Trustee all of  its rights, title and  interest in and to  such
    Bonds.
(2)  Aggregate value (at offering prices) as of the Date of  Deposit of the Bonds listed under "Schedules of Investments" herein,
    and their aggregate cost to the Trusts are the same. Such offering prices were determined by Kenny S&P Evaluation Services as
    of the close of business on the business day prior to the Date of Deposit. (See Section 10.) Insurance coverage providing for
    the timely payment, when due, of all principal  of and interest on the Bonds in  the Insured Trusts has been obtained by  the
    Sponsor  or by the issuers of such Bonds. Such insurance does not guarantee the market value of the Bonds or the value of the
    Units. Both the bid and the offering prices of the underlying  Bonds and of the Units may include value attributable to  such
    policies of insurance.
(3) Representing, as set forth in Section 8, advancement by the Trustee of an amount equal to the accrued Bond interest as of the
    Date of Deposit from the later of the last payment date on the Bonds or the date of issuance thereof.
(4) Aggregate Public Offering Price (exclusive of accrued interest) computed as set forth under Section 6.
(5) The gross underwriting commission has been calculated on the assumption that the Units offered by this prospectus are sold in
    single transactions involving less than $50,000 or 500 Units. At this level, the sales charge is 4.90% of the Public Offering
    Price  in the case of National and State Trusts, 4.25% thereof in  the case of Long Intermediate Trusts, 3.90% in the case of
    Intermediate Trusts, 3.00% in the  case of Short Intermediate Trusts  and 2.50% in the case  of Short Term Trusts. In  single
    transactions involving 500 Units or more, the sales charge is reduced. (See Section 6.)
</TABLE>
 
                                       35
<PAGE>
GENERAL TRUST INFORMATION
 
    RISK FACTORS.
 
    An  investment in Units of any Trust should be made with an understanding of
the risks that such an investment may  entail. These include the ability of  the
issuer,  or,  if  applicable,  an  insurer, to  make  payments  of  interest and
principal when due, the  effects of changes in  interest rates generally,  early
call provisions and the potential for changes in the tax status of the Bonds. As
set  forth  in the  portfolio  summaries above,  the  Trusts may  contain  or be
concentrated in one or more of the types of bonds discussed below. The following
paragraphs discuss certain circumstances which may adversely affect the  ability
of  issuers  of Bonds  held  in the  portfolio  of a  Trust  to make  payment of
principal and interest thereon or which may adversely affect the ratings of such
Bonds; with  respect  to  Insured  Trusts, however,  because  of  the  insurance
obtained  by the Sponsor or by the issuers of the Bonds, such changes should not
adversely affect  an Insured  Trust's  receipt of  principal and  interest,  the
Standard  & Poor's AAA or Moody's Aaa ratings  of the Bonds in the Insured Trust
portfolio, or the Standard & Poor's AAA rating of the Units of each such Insured
Trust. For  economic risks  specific  to the  individual Trusts,  see  "Economic
Factors" for each Trust.
 
    HEALTH  FACILITY  OBLIGATIONS.    Some  of  the  Bonds  in  a  Trust  may be
obligations of  issuers whose  revenues are  derived from  services provided  by
hospitals  or other health care facilities,  including nursing homes. Ratings of
bonds issued  for health  care  facilities are  sometimes based  on  feasibility
studies  that contain projections of occupancy  levels, revenues and expenses. A
facility's gross  receipts and  net income  available for  debt service  may  be
affected  by future events and conditions  including, among other things, demand
for services, the ability of the  facility to provide the services required,  an
increasing  shortage of qualified nurses or a dramatic rise in nursing salaries,
physicians'  confidence  in  the  facility,  management  capabilities,  economic
developments  in  the service  area, competition  from other  similar providers,
efforts by  insurers  and  governmental agencies  to  limit  rates,  legislation
establishing  state rate-setting agencies,  expenses, government regulation, the
cost and possible unavailability of  malpractice insurance, and the  termination
or  restriction of governmental financial  assistance, including that associated
with Medicare, Medicaid and other  similar third party payor programs.  Medicare
reimbursements are currently calculated on a prospective basis and are not based
on  a provider's actual costs. Such method of reimbursement may adversely affect
reimbursements to hospitals and other facilities for services provided under the
Medicare program and thereby may have an  adverse effect on the ability of  such
institutions  to satisfy  debt service requirements.  In the event  of a default
upon a bond  secured by hospital  facilities, the limited  alternative uses  for
such  facilities may result  in the recovery upon  such collateral not providing
sufficient funds to fully repay the bonds.
 
    Certain hospital  bonds  provide for  redemption  at par  upon  the  damage,
destruction  or  condemnation of  the hospital  facilities  or in  other special
circumstances.
 
    HOUSING OBLIGATIONS.  Some  of the Bonds  in a Trust  may be obligations  of
issuers  whose revenues  are primarily  derived from  mortgage loans  to housing
projects for  low  to  moderate  income  families.  Such  issues  are  generally
characterized  by mandatory redemption at par or,  in the case of original issue
discount bonds, accreted  value in  the event of  economic defaults  and in  the
event of a failure of the operator of a project to comply with certain covenants
as  to the  operation of  the project.  The failure  of such  operator to comply
 
                                      A-1
<PAGE>
with certain  covenants related  to the  tax-exempt status  of interest  on  the
Bonds,  such as  provisions requiring  that a  specified percentage  of units be
rented or available for rental to  low or moderate income families,  potentially
could cause interest on such Bonds to be subject to Federal income taxation from
the  date of  issuance of the  Bonds. The ability  of such issuers  to make debt
service payments will be  affected by events  and conditions affecting  financed
projects,  including,  among other  things, the  achievement and  maintenance of
sufficient occupancy levels  and adequate rental  income, employment and  income
conditions  prevailing in local labor markets, increases in taxes, utility costs
and other  operating  expenses,  the managerial  ability  of  project  managers,
changes  in laws and  governmental regulations, the  appropriation of subsidies,
and social and economic  trends affecting the localities  in which the  projects
are  located. Occupancy  of such housing  projects may be  adversely affected by
high rent  levels  and  income  limitations  imposed  under  Federal  and  state
programs.
 
    SINGLE  FAMILY MORTGAGE REVENUE BONDS.  Some of  the Bonds in a Trust may be
single family  mortgage revenue  bonds,  which are  issued  for the  purpose  of
acquiring  from originating financial institutions notes secured by mortgages on
residences located within the issuer's boundaries and owned by persons of low or
moderate income. Mortgage  loans are generally  partially or completely  prepaid
prior  to their  final maturities  as a  result of  events such  as sale  of the
mortgaged premises, default, condemnation or casualty loss. Because these  bonds
are  subject to extraordinary mandatory redemption in whole or in part from such
prepayments of mortgage loans, a substantial portion of such bonds will probably
be redeemed prior to their scheduled maturities or even prior to their  ordinary
call dates. Extraordinary mandatory redemption without premium could also result
from  the failure  of the  originating financial  institutions to  make mortgage
loans in sufficient amounts within a specified time period. The redemption price
of such  issues may  be more  or less  than the  offering price  of such  bonds.
Additionally,  unusually high rates of default  on the underlying mortgage loans
may reduce revenues  available for the  payment of principal  of or interest  on
such  mortgage revenue bonds. Single family  mortgage revenue bonds issued after
December 31, 1980 were issued under Section 103A of the Internal Revenue Code of
1954, as amended, or  Section 143 of  the Internal Revenue  Code of 1986,  which
Sections  contain certain  requirements relating to  the use of  the proceeds of
such bonds in  order for the  interest on  such bonds to  retain its  tax-exempt
status.  In each  case, the issuer  of the  bonds has covenanted  to comply with
applicable requirements and bond  counsel to such issuer  has issued an  opinion
that  the interest on the bonds is exempt from Federal income tax under existing
laws  and  regulations.  There  can   be  no  assurance  that  such   continuing
requirements  will be  satisfied; the  failure to  meet such  requirements could
cause interest on the Bonds to  be subject to Federal income taxation,  possibly
from the date of issuance of the Bonds.
 
    FEDERALLY  ENHANCED OBLIGATIONS.   Some  of the  mortgages which  secure the
various health care or housing projects which underlie the previously  discussed
Health  Facility, Housing, and  Single Family Mortgage  Revenue Obligations (the
"Obligations") in a Trust may be  insured by the Federal Housing  Administration
("FHA").  Under FHA  regulations, the  maximum insurable  mortgage amount cannot
exceed 90%  of  the FHA's  estimated  value of  the  project. The  FHA  mortgage
insurance  does not constitute a guarantee of timely payment of the principal of
and interest on the Obligations. Payment  of mortgage insurance benefits may  be
(1)  less than the principal amount of Obligations outstanding or (2) delayed if
disputes arise as to  the amount of  the payment or if  certain notices are  not
given
 
                                      A-2
<PAGE>
to  the  FHA  within the  prescribed  time  periods. In  addition,  some  of the
previously discussed Obligations may be secured by mortgage-backed  certificates
guaranteed  by the Government  National Mortgage Association  ("GNMA"), a wholly
owned corporate  instrumentality  of  the  United  States,  and/or  the  Federal
National   Mortgage  Association  ("Fannie  Mae")   a  federally  chartered  and
stockholder-owed corporation. GNMA  and Fannie Mae  guarantee timely payment  of
principal  and  interest on  the  mortgage-backed certificates,  even  where the
underlying  mortgage  payments   are  not  made.   While  such   mortgage-backed
certificates  are often pledged  to secure payment of  principal and interest on
the Obligations, timely payment of interest and principal on the Obligations  is
not  insured or guaranteed by  the United States, GNMA,  Fannie Mae or any other
governmental agency or  instrumentality. The  GNMA mortgage-backed  certificates
constitute  a general obligation of  the United States backed  by its full faith
and credit. The obligations of Fannie  Mae, including its obligations under  the
Fannie  Mae mortgage-backed securities, are obligations solely of Fannie Mae and
are not backed  by, or  entitled to,  the full faith  and credit  of the  United
States.
 
    INDUSTRIAL  REVENUE OBLIGATIONS.   Certain  of the Bonds  in a  Trust may be
industrial revenue bonds  ("IRBs"), including pollution  control revenue  bonds,
which  are  tax-exempt  securities  issued  by  states,  municipalities,  public
authorities or similar entities to  finance the cost of acquiring,  constructing
or improving various industrial projects. These projects are usually operated by
corporate entities. Issuers are obligated only to pay amounts due on the IRBs to
the  extent that funds are available from the unexpended proceeds of the IRBs or
receipts or revenues of the issuer  under an arrangement between the issuer  and
the  corporate operator of  a project. The arrangement  may be in  the form of a
lease, installment sale agreement, conditional sale agreement or loan agreement,
but in each case  the payments to  the issuer are designed  to be sufficient  to
meet  the payments  of amounts  due on  the IRBs.  Regardless of  the structure,
payment of IRBs is solely dependent  upon the creditworthiness of the  corporate
operator  of  the project  and,  if applicable,  corporate  guarantor. Corporate
operators or  guarantors may  be affected  by  many factors  which may  have  an
adverse  impact on  the credit  quality of  the particular  company or industry.
These include cyclicality of revenues and earnings, regulatory and environmental
restrictions, litigation  resulting  from  accidents  or  environmentally-caused
illnesses,  extensive competition  and financial deterioration  resulting from a
corporate restructuring pursuant to a leveraged buy-out, takeover or  otherwise.
Such  a restructuring may  result in the  operator of a  project becoming highly
leveraged which may have an impact on such operator's creditworthiness which  in
turn  would have  an adverse impact  on the  rating and/or market  value of such
Bonds. Further, the  possibility of  such a  restructuring may  have an  adverse
impact  on the market for and consequently  the value of such Bonds, even though
no actual takeover or other action is ever contemplated or effected. The IRBs in
a Trust may be subject to  special or extraordinary redemption provisions  which
may  provide for redemption  at par or,  in the case  of original issue discount
bonds, accreted value. The  Sponsor cannot predict the  causes or likelihood  of
the redemption of IRBs in a Trust prior to the stated maturity of such Bonds.
 
    ELECTRIC  UTILITY  OBLIGATIONS.    Some  of the  Bonds  in  a  Trust  may be
obligations of issuers  whose revenues are  primarily derived from  the sale  of
electric  energy. The problems  faced by such issuers  include the difficulty in
obtaining approval for timely  and adequate rate  increases from the  applicable
public  utility  commissions,  the difficulty  of  financing  large construction
programs, increased competition, reductions in estimates of
 
                                      A-3
<PAGE>
future demand for electricity in certain  areas of the country, the  limitations
on  operations  and increased  costs  and delays  attributable  to environmental
considerations, the difficulty of the capital market in absorbing utility  debt,
the  difficulty in obtaining fuel at reasonable  prices and the effect of energy
conservation. All  of  such issuers  have  been experiencing  certain  of  these
problems   in  varying  degrees.  In  addition,  Federal,  state  and  municipal
governmental authorities  may from  time  to time  review existing,  and  impose
additional,  regulations governing the licensing,  construction and operation of
nuclear power plants, which may adversely  affect the ability of the issuers  of
certain of the Bonds in a Trust to make payments of principal and/or interest on
such Bonds.
 
    TRANSPORTATION  FACILITY REVENUE BONDS.  Some of the Bonds in a Trust may be
obligations of issuers which  are payable from and  secured by revenues  derived
from  the ownership and operation of airports, public transit systems and ports.
The major portion of  an airport's gross operating  income is generally  derived
from  fees received  from airlines pursuant  to use agreements  which consist of
annual payments for airport  use, occupancy of  certain terminal space,  service
fees  and  leases. Airport  operating income  may therefore  be affected  by the
ability of the airlines to meet their obligations under the use agreements.  The
air  transport industry is  experiencing significant variations  in earnings and
traffic,  due  to  increased  competition,  excess  capacity,  increased  costs,
deregulation,  traffic constraints and  other factors, and  several airlines are
experiencing severe financial difficulties.  In particular, facilities with  use
agreements involving airlines experiencing financial difficulty may experience a
reduction  in revenue due  to the possible  inability of these  airlines to meet
their use  agreement  obligations because  of  such financial  difficulties  and
possible  bankruptcy.  The Sponsor  cannot  predict what  effect  these industry
conditions may have on airport revenues  which are dependent for payment on  the
financial  condition of the  airlines and their usage  of the particular airport
facility. Bonds that are secured primarily by the revenue collected by a  public
transit  system  typically are  additionally secured  by a  pledge of  sales tax
receipts collected  at  the state  or  local  level, or  of  other  governmental
financial assistance. Transit system net revenues will be affected by variations
in  utilization,  which  in  turn  may  be  affected  by  the  degree  of  local
governmental subsidization, demographic and  population shifts, and  competition
from  other forms  of transportation;  and by  increased costs,  including costs
resulting from previous deferrals of maintenance. Port authorities derive  their
revenues  primarily from fees imposed on ships using the facilities. The rate of
utilization of such facilities may fluctuate depending on the local economy  and
on  competition from  competing forms  of transportation  such as  air, rail and
trucks.
 
    WATER AND/OR SEWERAGE  OBLIGATIONS.  Some  of the  Bonds in a  Trust may  be
obligations  of issuers whose revenues are derived from the sale of water and/or
sewerage services. Such Bonds are generally payable from user fees. The problems
of such  issuers  include  the  ability  to  obtain  timely  and  adequate  rate
increases,  population decline resulting in  decreased user fees, the difficulty
of financing  large construction  programs, the  limitations on  operations  and
increased  costs and  delays attributable  to environmental  considerations, the
increasing difficulty of obtaining or  discovering new supplies of fresh  water,
the  effect  of  conservation  programs and  the  impact  of  "no-growth" zoning
ordinances. All of such issuers have been experiencing certain of these problems
in varying degrees.
 
    UNIVERSITY AND COLLEGE REVENUE  OBLIGATIONS.  Some of  the Bonds in a  Trust
may  be obligations  of issuers  which are,  or which  govern the  operation of,
colleges and universities and  whose revenues are  derived mainly from  tuition,
dormitory revenues, grants and
 
                                      A-4
<PAGE>
endowments. General problems of such issuers include the prospect of a declining
percentage  of the population consisting  of "college" age individuals, possible
inability to raise tuitions and  fees sufficiently to cover increased  operating
costs, the uncertainty of continued receipt of Federal grants and state funding,
and  government  legislation  or  regulations  which  may  adversely  affect the
revenues or costs of  such issuers. All of  such issuers have been  experiencing
certain of these problems in varying degrees.
 
    BRIDGE AUTHORITY AND TOLLROAD OBLIGATIONS.  Some of the Bonds in a Trust may
be  obligations  of issuers  which derive  their payments  from bridge,  road or
tunnel toll revenues. The revenues of such an issuer could be adversely affected
by competition from toll-free vehicular bridges and roads and alternative  modes
of transportation. Such revenues could also be adversely affected by a reduction
in  the availability of fuel to motorists  or significant increases in the costs
thereof. Specifically, governmental regulations restricting the use of  vehicles
in  the New  York City  metropolitan area may  adversely affect  revenues of the
Triborough Bridge and Tunnel Authority.
 
    DEDICATED-TAX SUPPORTED  BONDS.    Some of  the  Bonds  in a  Trust  may  be
obligations of issuers which are payable from and secured by tax revenues from a
designated  source, which revenues are pledged  to secure the bonds. The various
types of  Bonds described  below differ  in structure  and with  respect to  the
rights of the bondholders to the underlying property. Each type of dedicated-tax
supported  Bond has distinct risks, only some  of which are set forth below. One
type of dedicated-tax supported Bond is secured by the incremental tax  received
on  either real property or on  sales within a specifically defined geographical
area; such  tax  generally will  not  provide bondholders  with  a lien  on  the
underlying property or revenues. Another type of dedicated-tax supported Bond is
secured  by a special tax levied on  real property within a defined geographical
area in such  a manner  that the tax  is levied  on those who  benefit from  the
project;  such bonds  typically provide for  a statutory lien  on the underlying
property for unpaid taxes. A third  type of dedicated-tax supported Bond may  be
secured by a tax levied upon the manufacture, sale or consumption of commodities
or  upon the license to pursue  certain occupations or upon corporate privileges
within a taxing jurisdiction. As to any of these types of Bonds, the ability  of
the  designated revenues to satisfy the  interest and principal payments on such
bonds may be affected by changes in the local economy, the financial success  of
the  enterprise  responsible for  the payment  of  the taxes,  the value  of any
property on which taxes may be assessed and the ability to collect such taxes in
a timely fashion. Each  of these factors  will have a  different affect on  each
distinct type of dedicated-tax supported bonds.
 
    MUNICIPAL LEASE BONDS.  Some of the Bonds in a Trust may be obligations that
are  secured  by lease  payments  of a  governmental  entity. Such  payments are
normally subject to  annual budget  appropriations of  the leasing  governmental
entity.  A governmental  entity that enters  into such a  lease agreement cannot
obligate future  governments to  appropriate  for and  make lease  payments  but
covenants  to take such action as is necessary to include any lease payments due
in its budgets and to make the appropriations therefor. A governmental  entity's
failure to appropriate for and to make payments under its lease obligation could
result  in insufficient funds  available for payment  of the obligations secured
thereby.
 
    ORIGINAL ISSUE  DISCOUNT BONDS  AND STRIPPED  OBLIGATIONS.   Certain of  the
Bonds  in a Trust may be original  issue discount bonds. These Bonds were issued
with nominal  interest rates  less than  the rates  then offered  by  comparable
securities and as a consequence were
 
                                      A-5
<PAGE>
originally  sold at a  discount from their  face, or par,  values. This original
issue discount,  the difference  between  the initial  purchase price  and  face
value,  is deemed under current  law to accrue on a  daily basis and the accrued
portion is  treated  as  tax-exempt  interest  income  for  federal  income  tax
purposes.  On sale or redemption, gain, if any, realized in excess of the earned
portion of original issue discount will be taxable as capital gain. See "What is
the Tax Status of Unitholders". The current value of an original issue  discount
bond  reflects the  present value of  its face  amount at maturity.  In a stable
interest rate environment, the market value  of an original issue discount  bond
would  tend to increase more slowly in  early years and in greater increments as
the bond approached maturity.
 
    Certain of the original issue discount bonds  in a Trust may be zero  coupon
bonds. Zero coupon bonds do not provide for the payment of any current interest;
the  buyer receives only the right to receive a final payment of the face amount
of the bond at its maturity. The effect  of owning a zero coupon bond is that  a
fixed  yield is earned not only on  the original investment but also, in effect,
on all  discount  earned  during  the life  of  the  obligation.  This  implicit
reinvestment of earnings at the same rate eliminates the risk of being unable to
reinvest  the income on such obligation at a rate as high as the implicit yield,
but at the same time also eliminates the holder's ability to reinvest at  higher
rates  in  the  future.  For  this reason,  zero  coupon  bonds  are  subject to
substantially greater  price  fluctuations  during periods  of  changing  market
interest  rates  than are  securities of  comparable  quality that  pay interest
currently.
 
    Original issue discount bonds, including  zero coupon bonds, may be  subject
to  redemption at prices  based on the  issue price plus  the amount of original
issue  discount  accreted  to  redemption   (the  "accreted  value")  plus,   if
applicable,  some premium.  Pursuant to such  call provisions  an original issue
discount bond may be called prior to its maturity date at a price less than  its
face  value. See the  "Schedules of Investments" for  more information about the
call provisions of portfolio Bonds.
 
    Certain of the Bonds in a Trust may be Stripped Obligations, which represent
evidences of  ownership with  respect to  either the  principal amount  of or  a
payment  of interest on a tax-exempt  obligation. An obligation is "stripped" by
depositing it with  a custodian, which  then effects a  separation in  ownership
between  the bond and any interest payment which has not yet become payable, and
issues evidences of ownership with respect to such constituent parts. A Stripped
Obligation therefore has economic characteristics similar to zero coupon  bonds,
as described above.
 
    Each  Stripped Obligation has  been purchased at a  discount from the amount
payable at maturity. With respect to each Unitholder, the Internal Revenue  Code
treats  as "original issue discount" that portion of the discount which produces
a yield to maturity (as of the date of purchase of the Unitholder's Units) equal
to the lower of the coupon rate of interest on the underlying obligation or  the
yield  to maturity on the basis of  the purchase price of the Unitholder's Units
which is allocable to  each Stripped Obligation.  Original issue discount  which
accrues with respect to a Stripped Obligation will be exempt from Federal income
taxation  to the  same extent  as interest  on the  underlying obligations. (See
Section 11, " What Is The Tax Status of Unitholders".)
 
    Unitholders should consult their own tax advisers with respect to the  state
and  local tax consequences of owning  original issue discount bonds or Stripped
Obligations. Under applicable  provisions governing determination  of state  and
local taxes, interest on original
 
                                      A-6
<PAGE>
issue discount bonds or Stripped Obligations may be deemed to be received in the
year of accrual even though there is no corresponding cash payment.
 
4.  COMPOSITION OF TRUSTS
 
Each  Trust initially consists  of delivery statements  relating to contracts to
purchase Bonds (or of such Bonds) as are listed under "Schedules of Investments"
and, thereafter, of  such Bonds as  may continue to  be held from  time to  time
(including  certain securities deposited in the  Trust in substitution for Bonds
not delivered to the Trust or in exchange or substitution for Bonds upon certain
refundings), together  with  accrued  and  undistributed  interest  thereon  and
undistributed cash realized from the disposition of Bonds.
 
    "WHEN-ISSUED"  AND  "DELAYED  DELIVERY"  TRANSACTIONS.    The  contracts  to
purchase Bonds delivered to  the Trustee represent an  obligation by issuers  or
dealers  to deliver Bonds  to the Sponsor  for deposit in  the Trusts. Normally,
"regular way"  contracts are  settled and  the Bonds  delivered to  the  Trustee
within  a relatively  short period  of time.  However, certain  of the contracts
relate to Bonds which have not been issued  as of the Date of Deposit and  which
are  commonly referred to  as "when issued"  or "when, as  and if issued" Bonds.
Although the Sponsor does not believe it  is likely, one or more of the  issuers
of such Bonds might decide not to proceed with such offerings. If such Bonds, or
replacement  bonds described  below, are  not acquired  by a  Trust or  if their
delivery is  delayed, the  Estimated  Current Returns  and Estimated  Long  Term
Returns  shown herein may be reduced. Certain  of the contracts for the purchase
of Bonds provide for delivery dates  after the date of settlement for  purchases
made  on  the Date  of  Deposit. Interest  on  such "when  issued"  and "delayed
delivery" Bonds accrues to the benefit of Unitholders commencing with the  first
settlement  date for the Units. However,  in the opinion of counsel, Unitholders
who purchase their Units prior to the date such Bonds are actually delivered  to
the  Trustee must reduce the  tax basis of their  Units for interest accruing on
such Bonds during the interval between their purchase of Units and the  delivery
of  the Bonds because such amounts constitute a return of principal. As a result
of such adjustment, the  Estimated Current Returns set  forth herein (which  are
based  on the Public Offering Price as of  the business day prior to the Date of
Deposit) may be  slightly lower than  Unitholders will receive  after the  first
year,  assuming the Portfolio does not  change and estimated annual expense does
not vary from that set forth under "Essential Information Regarding the Trusts."
Those Bonds  in each  Trust purchased  with  delivery dates  after the  date  of
settlement  for  purchases made  on  the Date  of Deposit  are  so noted  in the
Schedules of Investments.
 
    LIMITED REPLACEMENT OF CERTAIN BONDS.   Neither the Sponsor nor the  Trustee
shall  be liable in any way  for any default, failure or  defect in any Bond. In
the event of a failure to deliver any  Bond that has been purchased for a  Trust
under  a contract, including those  Bonds purchased on a  when, as and if issued
basis ("Failed Bonds"), the Sponsor is authorized under the Indenture to  direct
the  Trustee to acquire  other specified Bonds ("Replacement  Bonds") to make up
the original corpus of the Trust. The Replacement Bonds must be purchased within
20 days after  delivery of notice  of the failed  contract and the  cost to  the
Trust  (exclusive  of  accrued interest)  may  not  exceed the  amount  of funds
reserved for the purchase  of the Failed Bonds.  The Replacement Bonds (i)  must
satisfy  the criteria previously described for  Bonds originally included in the
Trust and, with respect  to Bonds purchased  for a State  Trust, shall have  the
benefit of an exemption from state taxation of interest to an extent equal to or
greater  than that of  the Bonds they  replace, (ii) must  have a fixed maturity
date after the date of purchase of  not less than approximately 15 years in  the
case  of National or State Trusts, approximately 11  years in the case of a Long
Intermediate Trust, approximately 5 years in  the case of Intermediate or  State
Intermediate  Trusts, approximately 3 years in  the case of a Short Intermediate
Trust and
 
                                      A-7
<PAGE>
approximately 1 year in the case of a  Short Term Trust, but not later than  the
maturity date of the Failed Bonds, (iii) must be acquired at a cost to the Trust
equal  to the cost of the same principal  amount of Bonds provided in the failed
contract and have  a current  return and  yield to  maturity not  less than  the
current  return and yield to maturity of the  Failed Bonds and (iv) shall not be
"when, as and if  issued" Bonds. Whenever a  Replacement Bond has been  acquired
for  a Trust, the  Trustee shall, within  five days after  the delivery thereof,
mail or deliver a  notice of such  acquisition to all  Unitholders of the  Trust
involved.  Once the original corpus  of the Trust is  acquired, the Trustee will
have no power to vary the investment of the Trust; i.e., the Trust will have  no
managerial power to take advantage of market variation to improve a Unitholder's
investment.
 
    To  the extent the right of  limited substitution described in the preceding
paragraph shall not  be utilized  to acquire  Replacement Bonds  for the  entire
principal amount of Failed Bonds, the Sponsor shall refund to all Unitholders of
the  Trust  involved the  sales  charge attributable  to  such Failed  Bonds not
replaced, and  the principal  and accrued  interest attributable  to such  Bonds
shall  be distributed  not more  than 30  days after  the determination  of such
failure or at such earlier time as  the Trustee in its sole discretion deems  to
be  in  the interest  of  the Unitholders.  Any  such accrued  interest  paid to
Unitholders will be paid by the Sponsor and, accordingly, will not be treated as
tax-exempt income. In the event Failed Bonds  in a Trust could not be  replaced,
the  Net Annual Interest Income per Unit for such Trust would be reduced and the
Estimated Current Return thereon might be lowered.
 
    SALE, MATURITY AND REDEMPTION OF BONDS.  Certain of the Bonds may from  time
to  time  under certain  circumstances be  sold  or redeemed  or will  mature in
accordance with their terms. The proceeds from  such events will be used to  pay
for   Units  redeemed  or   distributed  to  Unitholders   and  not  reinvested;
accordingly, no assurance can be given that  a Trust will retain for any  length
of time its present size and composition.
 
    All  of the Bonds in  each Trust are subject to  being called or redeemed in
whole or  in part  prior to  their stated  maturities pursuant  to the  optional
redemption  provisions described in  the "Schedules of  Investments" and in most
cases pursuant to sinking fund, special or extraordinary redemption  provisions.
A  bond  subject to  optional  call 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 issue is redeemed, at  or before maturity, by the proceeds of  a
new  bond  issue. A  bond subject  to sinking  fund redemption  is one  which is
subject to  partial call  from time  to time  from a  fund accumulated  for  the
scheduled  retirement of  a portion  of an issue  prior to  maturity. Special or
extraordinary redemption  provisions may  provide  for redemption  of all  or  a
portion  of an  issue upon  the occurrence  of certain  circumstances related to
defaults or unanticipated changes  in circumstances. Events  that may permit  or
require  the special or extraordinary redemption of bonds include, among others:
substantial damage to or  destruction of the project  for which the proceeds  of
the  bonds were used; exercise by a local, state or federal governmental unit of
its power of eminent domain to take all or substantially all of the project  for
which  the  proceeds of  the bonds  were  used; a  final determination  that the
interest on the bonds  is taxable; changes in  the economic availability of  raw
materials,  operating supplies or  facilities or technological  or other changes
which render the operation of  the project for which  the proceeds of the  bonds
were  used uneconomical; changes in law  or an administrative or judicial decree
which render the performance  of the agreement under  which the proceeds of  the
bonds  were made  available to  finance the  project impossible  or which create
unreasonable burdens or which impose  excessive liabilities, such as taxes,  not
imposed  on the date the bonds are issued on the issuer of the bonds or the user
of the  proceeds  of the  bonds;  an  administrative or  judicial  decree  which
requires  the cessation of a  substantial part of the  operations of the project
financed with the proceeds of the bonds;
 
                                      A-8
<PAGE>
an overestimate of the costs of the project to be financed with the proceeds  of
the  bonds resulting in excess proceeds which may be applied to redeem bonds; or
an underestimate of  a source of  funds securing the  bonds resulting in  excess
funds which may be applied to redeem bonds. The Sponsor is unable to predict all
of  the circumstances which may result in  such redemption of an issue of Bonds.
See the discussion of the various  types of bond issues, above, for  information
on  the  call  provisions of  such  bonds, particularly  single  family mortgage
revenue bonds.
 
    The exercise of redemption or call provisions will (except to the extent the
proceeds of the called Bonds are used to pay for Unit redemptions) result in the
distribution of  principal  and may  result  in a  reduction  in the  amount  of
subsequent  interest distributions;  it may  also affect  the current  return on
Units of the Trust involved. Redemption pursuant to optional call provisions  is
more  likely to  occur, and  redemption pursuant to  sinking fund  or special or
extraordinary redemption provisions may occur,  when the Bonds have an  offering
side  evaluation which  represents a  premium over  par. Redemption  pursuant to
optional call provisions  may be,  and redemption  pursuant to  sinking fund  or
special or extraordinary redemption provisions is likely to be, at a price equal
to the par value of the bonds without any premium (in the case of original issue
discount  bonds, such redemption is generally to be made at the issue price plus
the amount of original issue discount  accreted to the date of redemption;  such
price  is referred to herein  as "accreted value"). Because  Bonds may have been
valued at prices above or below par value or the then current accreted value  at
the  time Units were  purchased, Unitholders may  realize gain or  loss upon the
redemption of portfolio  Bonds. (See Sections  11 and 13  and the "Schedules  of
Investments.")
 
    CERTAIN  TAX  MATTERS;  LITIGATION.   Certain  of  the Bonds  in  each Trust
portfolio may be subject  to continuing requirements such  as the actual use  of
bond proceeds, manner of operation of the project financed from bond proceeds or
rebate  of excess  earnings on  bond proceeds that  may affect  the exemption of
interest on such  Bonds from Federal  income taxation. Although  at the time  of
issuance  of each  of the  Bonds in each  Trust an  opinion of  bond counsel was
rendered as to the exemption of interest on such obligations from Federal income
taxation, and the issuers covenanted  to comply with all requirements  necessary
to retain the tax-exempt status of the Bonds, there can be no assurance that the
respective  issuers  or  other obligors  on  such obligations  will  fulfill the
various continuing  requirements  established  upon issuance  of  the  Bonds.  A
failure to comply with such requirements may cause a determination that interest
on  such  obligations  is  subject  to  Federal  income  taxation,  perhaps even
retroactively from the  date of  issuance of  such Bonds,  thereby reducing  the
value of the Bonds and subjecting Unitholders to unanticipated tax liabilities.
 
    To  the best knowledge of the Sponsor,  there is no litigation pending as of
the Date of Deposit in respect of  any Bonds which might reasonably be  expected
to  have a  material adverse effect  on any of  the Trusts. It  is possible that
after the Date of Deposit, litigation may be initiated with respect to Bonds  in
any  Trust. Any  such litigation may  affect the  validity of such  Bonds or the
tax-exempt nature of the interest thereon,  but while the outcome of  litigation
of  such nature can never be entirely predicted, the opinions of bond counsel to
the issuer of  each Bond  on the  date of issuance  state that  such Bonds  were
validly issued and that the interest thereon is, to the extent indicated, exempt
from Federal income tax.
 
                                      A-9
<PAGE>
5.  WHY AND HOW ARE THE BONDS INSURED?
 
INSURANCE ON BONDS IN INSURED TRUSTS
 
Insurance  guaranteeing  the  timely payment,  when  due, of  all  principal and
interest on the Bonds in each Insured Trust has been obtained by the Sponsor  or
by  the  issuers or  underwriters  of Bonds  from  the Municipal  Bond Investors
Assurance Corporation (the "Insurer"). Some of  the Bonds in each Insured  Trust
may  be covered by a policy or policies  of insurance obtained by the issuers or
underwriters of  the  Bonds  from  Municipal  Bond  Insurance  Association  (the
"Association") or Bond Investors Guaranty Insurance Company ("BIG"). The Insurer
has  issued a policy or policies of insurance  covering each of the Bonds in the
Insured Trusts, each policy to remain in force until the payment in full of such
Bonds and whether or not the Bonds continue  to be held by an Insured Trust.  By
the  terms  of each  policy the  Insurer will  unconditionally guarantee  to the
holders or owners of the Bonds the payment, when due, required of the issuer  of
the  Bonds of an amount equal  to the principal of and  interest on the Bonds as
such payments shall become due but not be paid (except that in the event of  any
acceleration  of the due  date of principal  by reason of  mandatory or optional
redemption, default or otherwise, the payments  guaranteed will be made in  such
amounts  and  at  such times  as  would have  been  due  had there  not  been an
acceleration). The  Insurer will  be  responsible for  such payments,  less  any
amounts  received by the holders or owners of the Bonds from any trustee for the
bond issuers or  from any other  sources other than  the Insurer. The  Insurer's
policies  relating to small  industrial development bonds  and pollution control
revenue bonds also guarantee the full and complete 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 thereby required. The Insurer has indicated that its  insurance
policies  do not insure the payment of  principal or interest on bonds which are
not required to be paid by the issuer thereof because the bonds were not validly
issued; as  indicated  under  "What  is the  Tax  Status  of  Unitholders?"  the
respective  issuing authorities have received  opinions of bond counsel relating
to the valid issuance of each of the Bonds in the Insured Trusts. The  Insurer's
policy  also does not insure against non-payment  of principal of or interest on
the Bonds resulting from the insolvency, negligence or any other act or omission
of the trustee or other paying agent for the Bonds. The policy is not covered by
the Property/ Casualty Insurance  Security Fund specified in  Article 76 of  the
New  York  Insurance Law.  The policies  are  non-cancellable and  the insurance
premiums have been fully paid on or prior to the Date of Deposit, either by  the
Sponsor or, if a policy has been obtained by a Bond issuer, by such issuer.
 
    Upon  notification from  the trustee  for any bond  issuer or  any holder or
owner of the Bonds or coupons that such trustee or paying agent has insufficient
funds to pay any  principal or interest  in full when due,  the Insurer will  be
obligated  to deposit funds  promptly with State Street  Bank and Trust Company,
N.A., New York, New York, as fiscal  agent for the Insurer, sufficient to  fully
cover the deficit. If notice of nonpayment is received on or after the due date,
the  Insurer will provide for payment  within one business day following receipt
of the notice. Upon payment  by the Insurer of  any Bonds, coupons, or  interest
payments,  the Insurer shall succeed  to the rights of  the owner of such Bonds,
coupons or interest payments with respect thereto.
 
    The Insurer is the principal operating subsidiary of MBIA, Inc., a New  York
Stock  Exchange listed company. MBIA, Inc. is  not obligated to pay the debts of
or claims against the  Insurer. The Insurer is  a limited liability  corporation
rather  than a  several liability association.  The Insurer is  domiciled in the
State of New York and licensed to do business in all 50 states, the District  of
Columbia and the Commonwealth of Puerto Rico.
 
                                      A-10
<PAGE>
    As  of December  31, 1993  the Insurer had  admitted assets  of $3.1 billion
(audited), total liabilities of  $2.1 billion (audited),  and total capital  and
surplus  of  $978  million  (audited) determined  in  accordance  with statutory
accounting  practices   prescribed   or  permitted   by   insurance   regulatory
authorities.  As of September 30, 1994, the  Insurer had admitted assets of $3.3
billion (unaudited), total  liabilities of $2.2  billion (unaudited), and  total
capital  and surplus of  $1.1 billion (unaudited)  determined in accordance with
statutory accounting practices prescribed  or permitted by insurance  regulatory
authorities.  Copies of the Insurer's year  end financial statements prepared in
accordance with statutory accounting practices  are available from the  Insurer.
The address of the Insurer is 113 King Street, Armonk, New York 10504.
 
    Each  insurance company comprising the Association will be severally and not
jointly obligated  under  the Association  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  (now  known  as CIGNA  Property  and  Casualty 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 the  Association  policy and  will  not be  obligated  to pay  any  unpaid
obligation  of any  other member  of the  Association. 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.
 
    The following table sets forth certain unaudited financial information  with
respect  to  the  five  insurance  companies  comprising  the  Association.  The
statistics, which have been furnished by the Association, are as reported by the
insurance  companies  to  the  New  York  State  Insurance  Department  and  are
determined in accordance with statutory accounting principles. 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
      FIVE MEMBER COMPANIES ASSETS AND POLICYHOLDERS' SURPLUS (UNAUDITED)
                           AS OF SEPTEMBER 30, 1994.
                                (000'S OMITTED)
 
<TABLE>
<CAPTION>
                                                              NEW YORK         NEW YORK         NEW YORK
                                                              STATUTORY        STATUTORY     POLICYHOLDERS
                                                               ASSETS         LIABILITIES       SURPLUS
                                                           ---------------  ---------------  --------------
<S>                                                        <C>              <C>              <C>
The AEtna Casualty & Surety Company......................  $    10,030,200  $     8,275,300   $  1,754,900
Fireman's Fund Insurance Company.........................        6,815,775        4,904,534      1,911,241
The Travelers Indemnity Company..........................       10,295,359        8,515,392      1,779,967
CIGNA Property and Casualty Company (formerly AEtna
  Insurance Company).....................................        5,112,251        4,842,235        270,016
The Continental Insurance Company........................        2,794,536        2,449,805        344,731
                                                           ---------------  ---------------  --------------
        Total............................................  $    35,048,121  $    28,987,266   $  6,060,855
                                                           ---------------  ---------------  --------------
                                                           ---------------  ---------------  --------------
</TABLE>
 
    Standard   &  Poor's  Corporation  rates  all  new  issues  insured  by  the
Association "AAA" Prime Grade.
 
    Moody's Investors Service rates all  bond issues insured by the  Association
"Aaa"  and  short term  loans  "MIG 1",  both designated  to  be of  the highest
quality.
 
                                      A-11
<PAGE>
    Each such rating should be evaluated  independently of any other rating.  No
application  has  been  made to  any  other  rating agency  in  order  to obtain
additional ratings  on the  Bonds.  The ratings  reflect the  respective  rating
agency's  current assessment of the creditworthiness  of the Association and its
ability to pay claims on its  policies of insurance. Any further explanation  as
to  the  significance  of  the  above ratings  may  be  obtained  only  from the
applicable rating agency.
 
    Moody's Investors Service rates all bond issues insured by the Insurer "Aaa"
and short-term loans "MIG 1," both designated to be of the highest quality.
 
    Standard & Poor's  Ratings Group,  a division  of McGraw  Hill ("Standard  &
Poor's") rates all new issues insured by the Insurer "AAA" Prime Grade."
 
    The  Moody's Investors  Service rating  of the  Insurer should  be evaluated
independently of the  Standard & Poor's  Corporation rating of  the Insurer.  No
application  has  been  made to  any  other  rating agency  in  order  to obtain
additional ratings  on the  Bonds.  The ratings  reflect the  respective  rating
agency's  current  assessment of  the creditworthiness  of  the Insurer  and its
ability to  pay  claims  on  its policies  of  insurance  (See  "Description  of
Ratings.")  Any further explanation as to  the significance of the above ratings
may be obtained only from the applicable rating agency.
 
    The above ratings are  not recommendations to buy,  sell or hold the  Bonds,
and  such ratings may  be subject to revision  or withdrawal at  any time by the
rating agencies. Any downward revision or  withdrawal of either or both  ratings
may have an adverse effect on the market price of the Bonds.
 
    Because  the insurance on the  Bonds will be effective  so long as the Bonds
are outstanding, such insurance  will be taken into  account in determining  the
market  value  of  the  Bonds  and therefore  some  value  attributable  to such
insurance will be included in the value of the Units of the Insured Trusts.  The
insurance  does not, however, guarantee the market  value of the Bonds or of the
Units.
 
INSURANCE ON CERTAIN BONDS IN TRADITIONAL TRUSTS
 
    Insurance guaranteeing the timely  payment, when due,  of all principal  and
interest  on certain Bonds in a Traditional  Trust may have been obtained by the
Sponsor, issuer or underwriter  of the particular Bonds  involved or by  another
party.  Such insurance, which  provides coverage substantially  the same as that
obtained with  respect  to  Bonds  in Insured  Trusts  as  described  above,  is
effective  so long as the insured Bond is outstanding and the insurer remains in
business. Insurance relates  only to the  particular Bond and  not to the  Units
offered hereby or to their market value. Insured Bonds have received a rating of
"Aaa"  by  Moody's Investors  Service, Inc.  and/or "AAA"  by Standard  & Poor's
Corporation in recognition of such insurance.
 
    If a Bond  in a Traditional  Trust is insured,  the Schedule of  Investments
will identify the insurer. Such insurance will be provided by Financial Guaranty
Insurance   Company  ("FGIC"),  AMBAC   Indemnity  Corporation  ("AMBAC"),  Bond
Investors Guaranty  Insurance  Company, now  known  as MBIA  Corp.  of  Illinois
("BIG"),   Capital  Guaranty  Insurance  Company  ("CGIC"),  Financial  Security
Assurance,   Inc.   ("FSA"),   Municipal   Bond   Insurance   Association   (the
"Association"),  Municipal  Bond  Investors  Assurance  Corporation  ("MBIA") or
Connie Lee Insurance Company  ("ConnieLee"). The Sponsor  to date has  purchased
and  presently intends  to purchase  insurance for  Bonds in  Traditional Trusts
exclusively from MBIA (see the  preceding disclosure regarding MBIA). There  can
be  no assurance  that any insurer  listed therein  will be able  to satisfy its
commitments in the
 
                                      A-12
<PAGE>
event claims are made in the future. However, Standard & Poor's Corporation  has
rated  the claims-paying  ability of each  insurer "AAA,"  and Moody's Investors
Service has rated  all bonds  insured by  each such  insurer, except  ConnieLee,
"Aaa."  Moody's  Investor's  Service  gives  no  ratings  for  bonds  insured by
ConnieLee.
 
    Because any such insurance  will be effective so  long as the insured  Bonds
are  outstanding, such insurance  will be taken into  account in determining the
market value  of  such Bonds  and  therefore  some value  attributable  to  such
insurance  will be included in the value of the Units of the Trust that includes
such Bonds. The insurance does not,  however, guarantee the market value of  the
Bonds or of the Units.
 
6.  HOW IS THE PUBLIC OFFERING PRICE DETERMINED?
 
The  Public Offering Price of the Units of  each Trust is equal to the Trustee's
determination of the aggregate  OFFERING prices of  the Bonds deposited  therein
(minus  any  advancement to  the  principal account  of  the Trust  made  by the
Trustee) plus a sales charge of 5.152%  of the aggregate offering prices in  the
case  of National and State  Trusts, 4.439% of the  aggregate offering prices in
the case of Long Intermediate Trusts, 4.058% of the aggregate offering prices in
the case of Intermediate Trusts, 3.093% of the aggregate offering prices in  the
case of Short Intermediate Trusts and 2.564% of the aggregate offering prices in
the  case of Short  Term Trusts, in each  case adding to  the total thereof cash
held by the Trust,  if any, and dividing  the sum so obtained  by the number  of
Units  outstanding in the Trust. This  computation produces a gross underwriting
profit equal to 4.90% of the Public  Offering Price in the case of National  and
State  Trusts,  4.25%  of  the  Public  Offering  Price  in  the  case  of  Long
Intermediate Trusts,  3.90%  of  the  Public  Offering  Price  in  the  case  of
Intermediate  Trusts, 3.00% of  the Public Offering  Price in the  case of Short
Intermediate Trusts and 2.50% of the Public Offering Price in the case of  Short
Term Trusts.
 
    The  sales charge applicable to quantity purchases is reduced on a graduated
scale for sales to any  purchaser of at least $50,000  or 500 Units and will  be
applied  on whichever basis is more favorable  to the purchaser. For purposes of
calculating the applicable  sales charge,  purchasers who  have indicated  their
intent  to purchase a specified amount of Units of any Trust described herein in
the primary or secondary offering period or units of any other series of  Nuveen
Tax-Exempt  Unit Trusts in the primary or secondary offering period by executing
and delivering a letter of intent to the Sponsor, which letter of intent must be
in a  form acceptable  to  the Sponsor  and shall  have  a maximum  duration  of
thirteen months, will be eligible to receive a reduced sales charge according to
the  following tables  based on  the amount  of intended  aggregate purchases as
expressed in the  letter of  intent. Due  to administrative  limitations and  in
order to permit adequate tracking, the only secondary market purchases that will
be  permitted to be applied  toward the intended specified  amount and that will
receive the corresponding reduced sales charge are those Units that are acquired
through or from the  Sponsor. By establishing a  letter of intent, a  Unitholder
agrees  that the first purchase of Units  following the execution of such letter
of intent will  be at least  5% of the  total amount of  the intended  aggregate
purchases  expressed in such Unitholder's letter of intent. Further, through the
establishment of  the  letter  of  intent, such  Unitholder  agrees  that  units
representing  5% of the total  amount of the intended  purchases will be held in
escrow by United States  Trust Company of New  York pending completion of  these
purchases.  All distributions on units  held in escrow will  be credited to such
Unitholder's account. If total purchases prior  to the expiration of the  letter
of  intent period equal or exceed the  amount specified in a Unitholder's letter
of intent, the  units held in  escrow will be  transferred to such  Unitholder's
account.  If  the  total  purchases  are less  than  the  amount  specified, the
Unitholder involved  must pay  the Sponsor  an amount  equal to  the  difference
between  the amounts paid for  these purchases and the  amounts which would have
been  paid   if  the   higher   sales  charge   had   been  applied.   If   such
 
                                      A-13
<PAGE>
Unitholder  does  not pay  the additional  amount within  20 days  after written
request by  the  Sponsor  or the  Unitholder's  securities  representative,  the
Sponsor  will  instruct  the Trustee  to  redeem  an appropriate  number  of the
escrowed units to meet the required payment. By establishing a letter of intent,
a Unitholder irrevocably appoints the  Sponsor as attorney to give  instructions
to  redeem any or  all of such  Unitholder's escrowed units,  with full power of
substitution in the premises. A Unitholder or his securities representative must
notify the Sponsor whenever  such Unitholder makes a  purchase of Units that  he
wishes  to  be counted  towards the  intended amount.  Sales charges  during the
primary offering period are as follows:
 
<TABLE>
<CAPTION>
                                                         NATIONAL AND STATE      LONG INTERMEDIATE
                                                               TRUSTS                  TRUSTS           INTERMEDIATE TRUSTS
                                                       ----------------------  ----------------------  ----------------------
<S>                                                    <C>          <C>        <C>          <C>        <C>          <C>
                                                         PERCENT     PERCENT     PERCENT     PERCENT     PERCENT     PERCENT
                                                           OF        OF NET        OF        OF NET        OF        OF NET
                                                        OFFERING     AMOUNT     OFFERING     AMOUNT     OFFERING     AMOUNT
                  NUMBER OF UNITS*                        PRICE     INVESTED      PRICE     INVESTED      PRICE     INVESTED
- -----------------------------------------------------  -----------  ---------  -----------  ---------  -----------  ---------
Less than 500........................................        4.90%      5.152%       4.25%      4.439%       3.90%      4.058%
500 but less than 1,000..............................        4.75       4.987        4.15       4.330        3.70       3.842
1,000 but less than 2,500............................        4.50       4.712        3.85       4.004        3.50       3.627
2,500 but less than 5,000............................        4.25       4.439        3.60       3.734        3.25       3.359
5,000 but less than 10,000...........................        3.50       3.627        3.35       3.466        3.00       3.093
10,000 but less than 25,000..........................        3.00       3.093        3.00       3.093        2.75       2.828
25,000 but less than 50,000..........................        2.50       2.564        2.50       2.564        2.50       2.564
50,000 or more.......................................        2.00       2.041        2.00       2.041        2.00       2.041
</TABLE>
 
<TABLE>
<CAPTION>
                                                         SHORT INTERMEDIATE
                                                               TRUSTS            SHORT TERM TRUSTS
                                                       ----------------------  ----------------------
<S>                                                    <C>          <C>        <C>          <C>        <C>          <C>
                                                         PERCENT     PERCENT     PERCENT     PERCENT
                                                           OF        OF NET        OF        OF NET
                                                        OFFERING     AMOUNT     OFFERING     AMOUNT
                  NUMBER OF UNITS*                        PRICE     INVESTED      PRICE     INVESTED
- -----------------------------------------------------  -----------  ---------  -----------  ---------
Less than 500........................................        3.00%      3.093%       2.50%      2.564%
500 but less than 1,000..............................        2.80       2.881        2.30       2.354
1,000 but less than 2,500............................        2.60       2.670        2.10       2.145
2,500 but less than 5,000............................        2.35       2.407        1.85       1.885
5,000 but less than 10,000...........................        2.10       2.145        1.60       1.626
10,000 but less than 25,000..........................        1.85       1.885        1.35       1.368
25,000 but less than 50,000..........................        1.80       1.833        1.25       1.266
50,000 or more.......................................        1.50       1.523        1.15       1.163
</TABLE>
 
*Breakpoint sales charges are computed both on  a dollar basis and on the  basis
 of the number of Units purchased, using the equivalent of 500 Units to $50,000,
 2,500  Units to $250,000 etc., and will be  applied on that basis which is more
 favorable to the purchaser.
 
    For "secondary market"  sales the  Public Offering  Price per  Unit of  each
Trust is determined by adding to the Trustee's determination of the BID price of
each  Bond in the Trust  a sales charge determined  in accordance with the table
set forth below based upon the number of years remaining to the maturity of each
such Bond, adjusting  the total to  reflect the amount  of any cash  held in  or
advanced  to the principal account  of the Trust and  dividing the result by the
number of Units then outstanding. For  purposes of this calculation, Bonds  will
be  deemed to mature on  their stated maturity dates  unless: (a) the Bonds have
been called for redemption or funds or securities have been placed in escrow  to
redeem  them on  an earlier  call date, in  which case  such call  date shall be
deemed to be the date upon which they mature; or (b) such Bonds are subject to a
"mandatory put," in which case such mandatory put date shall be deemed to be the
date upon  which  they  mature.  Any assumptions  regarding  maturity  made  for
purposes  of  determining the  appropriate  sales charge  in  no way  predict or
guarantee the actual remaining life of a given Trust.
 
    Pursuant to the terms of the Indenture, the Trustee may terminate a Trust if
the net asset value of such Trust, as shown by any evaluation, is less than  20%
of  the  original principal  amount of  the  Trust. In  the course  of regularly
appraising the value of Bonds in
 
                                      A-14
<PAGE>
each Trust, the Sponsor  will attempt to  estimate the date  on which a  Trust's
value will fall below the 20% level based on anticipated bond events over a five
year period, including maturities, escrow calls and current calls or refundings,
assuming  certain  market  rates.  The  Sponsor intends  from  time  to  time to
recommend that certain  Trusts whose values  have fallen or  are anticipated  to
fall  below the 20%  level be terminated  based on certain  criteria which could
adversely affect the  Trust's diversification. Once  the Sponsor has  determined
that  a Trust's  value has or  may fall below  the 20% level  within a five-year
period, for purposes  of computing the  sales charge using  the table set  forth
below,  the maturity of each bond in such Trust will be deemed to be the earlier
of the estimated termination  date of the  Trust, or the  actual date used  when
pricing   the  bond  under  Municipal  Securities  Rulemaking  Board  rules  and
interpretations issued thereunder.
 
    The effect of this method of sales charge calculation will be that different
sales charge rates will  be applied to  the various Bonds  in a Trust  portfolio
based  upon  the maturities  of  such Bonds,  in  accordance with  the following
schedule. As  shown, the  sales charge  on  Bonds in  each maturity  range  (and
therefore the aggregate sales charge on the purchase) is reduced with respect to
purchases of at least $50,000 or 500 Units:
<TABLE>
<CAPTION>
                                                                  AMOUNT OF PURCHASE*
                             ---------------------------------------------------------------------------------------------
<S>                          <C>          <C>          <C>          <C>          <C>          <C>            <C>
                                            $50,000     $100,000     $250,000     $500,000     $1,000,000     $2,500,000
                                UNDER         TO           TO           TO           TO            TO             TO
YEARS TO MATURITY              $50,000      $99,999     $249,999     $499,999     $999,999     $2,499,999     $4,999,999
- ---------------------------  -----------  -----------  -----------  -----------  -----------  -------------  -------------
Less than 1................           0            0            0            0            0             0              0
1 but less than 2..........       1.523%       1.446%       1.369%       1.317%       1.215%        1.061%          .900%
2 but less than 3..........       2.041        1.937        1.833        1.729        1.626         1.420          1.225
3 but less than 4..........       2.564        2.433        2.302        2.175        2.041         1.781          1.546
4 but less than 5..........       3.093        2.961        2.828        2.617        2.459         2.175          1.883
5 but less than 7..........       3.627        3.433        3.239        3.093        2.881         2.460          2.165
7 but less than 10.........       4.167        3.951        3.734        3.520        3.239         2.828          2.489
10 but less than 13........       4.712        4.467        4.221        4.004        3.788         3.253          2.842
13 but less than 16........       5.263        4.988        4.712        4.439        4.167         3.627          3.169
16 or more.................       5.820        5.542        5.263        4.987        4.603         4.004          3.500
 
<CAPTION>
 
<S>                          <C>
 
                              $5,000,000
YEARS TO MATURITY               OR MORE
- ---------------------------  -------------
Less than 1................            0
1 but less than 2..........         .750%
2 but less than 3..........        1.030
3 but less than 4..........        1.310
4 but less than 5..........        1.590
5 but less than 7..........        1.870
7 but less than 10.........        2.150
10 but less than 13........        2.430
13 but less than 16........        2.710
16 or more.................        3.000
</TABLE>
 
 *Breakpoint  sales charges are computed both on a dollar basis and on the basis
  of the  number  of Units  purchased,  using the  equivalent  of 500  Units  to
  $50,000,  2,500 Units  to $250,000,  etc., and will  be applied  on that basis
  which is more favorable to the purchaser.
 
    The secondary market sales charges above  are expressed as a percent of  the
net  amount invested; expressed as  a percent of the  Public Offering Price, the
maximum sales charge on  any Trust, including one  consisting entirely of  Bonds
with  16 years  or more to  maturity, would be  5.50% (5.820% of  the net amount
invested). For purposes of illustration, the sales charge on a Trust  consisting
entirely  of Bonds maturing  in 13 to  16 years would  be 5% (5.263%  of the net
amount invested); that on a Trust consisting entirely of Bonds maturing in  five
to  seven years would be 3.5% (3.627% of the net amount invested); and that on a
Trust consisting entirely of Bonds maturing in three to four years would be 2.5%
(2.564% of the net  amount invested). The actual  secondary market sales  charge
included in the Public Offering Price of any particular Trust will depend on the
maturities of the Bonds in the portfolio of such Trust.
 
    At  all  times while  Units are  being  offered for  sale, the  Sponsor will
appraise or cause to  be appraised daily  the value of  the underlying Bonds  in
each  Trust as of 4:00 p.m. eastern time on each day on which the New York Stock
Exchange (the "Exchange") is normally open  and will adjust the Public  Offering
Price  of the Units commensurate with such appraisal. Such Public Offering Price
will be effective for all orders received by a dealer or the Sponsor at or prior
to 4:00 p.m. eastern time on each such day. Orders received after that time,  or
on a day when the Exchange is closed for a scheduled holiday or weekend, will be
held until the next determination of price.
 
                                      A-15
<PAGE>
    As  more fully set forth  in Section 8, accrued  interest from the preceding
Record Date to, but not including, the settlement date of the transaction  (five
business  days after  purchase) will  be added to  the Public  Offering Price to
determine the purchase price of Units.
 
    The above graduated sales charges will apply on all applicable purchases  of
Nuveen investment company securities on any one day by the same purchaser in the
amounts stated, and for this purpose purchases of this Series will be aggregated
with  concurrent purchases  of any  other Series  or of  shares of  any open-end
management investment company of which the Sponsor is principal underwriter  and
with respect to the purchase of which a sales charge is imposed.
 
    Purchases  by or for the account of an  individual and his or her spouse and
children under 21 years  of age will be  aggregated to determine the  applicable
sales  charge. The graduated sales  charges are also applicable  to a trustee or
other fiduciary  purchasing  securities for  a  single trust  estate  or  single
fiduciary account.
 
    Units  may be purchased at the Public  Offering Price without a sales charge
by officers or directors and by bona fide, full-time employees of Nuveen, Nuveen
Advisory Corp., Nuveen Institutional Advisory Corp. and The John Nuveen Company,
including in each case these individuals and their immediate family members  (as
defined above).
 
    Units  may be  purchased in  the primary or  secondary market  at the Public
Offering Price for  non-breakpoint purchases  minus the  concession the  Sponsor
typically  allows  to  brokers  and dealers  for  non-breakpoint  purchases (see
Section 17) by (1)  investors who purchase  Units through registered  investment
advisers, certified financial planners and registered broker-dealers who in each
case  either charge periodic fees for financial planning, investment advisory or
asset management  services, or  provide  such services  in connection  with  the
establishment  of an  investment account  for which  a comprehensive  "wrap fee"
charge is imposed, (2)  bank trust departments investing  funds over which  they
exercise  exclusive discretionary  investment authority and  that are  held in a
fiduciary, agency, custodial  or similar  capacity, (3)  any person  who for  at
least  90 days, has been an officer, director  or bona fide employee of any firm
offering Units  for sale  to investors  or their  immediate family  members  (as
defined  above) and  (4) officers and  directors of bank  holding companies that
make Units  available  directly  or through  subsidiaries  or  bank  affiliates.
Notwithstanding  anything to  the contrary  in this  Prospectus, such investors,
bank trust departments,  firm employees  and bank holding  company officers  and
directors  who purchase Units through this program will not receive sales charge
reductions for quantity purchases.
 
    The initial or primary Public Offering Price  of the Units in each Trust  is
based upon a pro rata share of the OFFERING prices per Unit of the Bonds in such
Trust  plus the  applicable sales charge.  The secondary  market Public Offering
Price of each Trust is based upon a pro rata share of the BID prices per Unit of
the Bonds in such Trust plus the applicable sales charge. The OFFERING prices of
Bonds in a Trust may be expected to average approximately 1% to 2% more than the
BID prices of such Bonds  in the case of  National, Long Intermediate and  State
Trusts,  3/4%  to 1  1/2% in  the  case of  Intermediate and  Short Intermediate
Trusts, and  1/2% to  3/4% in  the case  of Short  Term Trusts.  The  difference
between the bid side evaluation and the offering side evaluation of the Bonds in
each  Trust on the  business day prior  to the Date  of Deposit is  shown in the
discussion of each Trust portfolio.
 
    Whether or not Units are being offered for sale, the Sponsor will  determine
the aggregate value of each Trust as of 4:00 p.m. eastern time: (i) on each June
30 or December 31 (or, if such date is not a business day, the last business day
prior  thereto), (ii) on any day on which  a Unit is tendered for redemption (or
the next succeeding business day  if the date of  tender is a non-business  day)
and    (iii)    at   such    other   times    as    may   be    necessary.   For
 
                                      A-16
<PAGE>
this purpose,  a "business  day"  shall be  any day  on  which the  Exchange  is
normally open. (See Section 16.)
 
7.  MARKET FOR UNITS
 
During  the  initial public  offering period,  the Sponsor  intends to  offer to
purchase Units of each  Trust at a  price equivalent to the  pro rata share  per
Unit  of the OFFERING prices of the Bonds in such Trust (plus accrued interest).
Afterward, although  it  is not  obligated  to do  so,  the Sponsor  intends  to
maintain  a secondary  market for  Units of  each Trust  at its  own expense and
continuously to offer  to purchase  Units of each  Trust at  prices, subject  to
change  at  any time,  which  are based  upon  the BID  prices  of Bonds  in the
respective portfolios of the Trusts. If the supply of Units of any of the Trusts
of this Series exceeds  demand, or for some  other business reason, the  Sponsor
may discontinue purchases of Units of such Trust at such prices. UNITHOLDERS WHO
WISH  TO DISPOSE OF THEIR UNITS SHOULD INQUIRE OF THE TRUSTEE OR THEIR BROKER AS
TO THE  CURRENT  REDEMPTION PRICE  (SEE  SECTION  19). In  connection  with  its
secondary  marketmaking activities, the Sponsor may from time to time enter into
secondary market  joint  account  agreements with  other  brokers  and  dealers.
Pursuant to such an agreement the Sponsor will purchase Units from the broker or
dealer at the bid price and will place the Units into a joint account managed by
the  Sponsor; sales from  the account will  be made in  accordance with the then
current prospectus and the Sponsor and  the broker or dealer will share  profits
and  losses in  the joint account  in accordance  with the terms  of their joint
account agreement.
 
    Certificates, if any, for Units are  delivered to the purchaser as  promptly
after  the date of settlement (five business days after purchase) as the Trustee
can complete the mechanics of registration. Normally, Certificates, if any,  are
mailed  by  the  Trustee within  48  hours after  registration  instructions are
received. Purchasers of Units to whom Certificates are issued will be unable  to
exercise  any right of redemption until they have received their Certificates as
tender of the Certificate, properly endorsed for transfer. (See Section 19.)
 
    Each Unit  of each  respective Trust  initially offered  by this  Prospectus
represents  that fractional  undivided interest  in such  Trust as  is set forth
under "Essential Information Regarding the Trusts." To the extent that any Units
of any Trust are  redeemed by the  Trustee, the aggregate  value of the  Trust's
assets  will decrease by  the amount paid  to the redeeming  Unitholder, but the
fractional undivided  interest  of  each  unredeemed Unit  in  such  Trust  will
increase  proportionately. The  Sponsor will  initially, and  from time  to time
thereafter, hold Units in connection with their offering.
 
8.  WHAT IS ACCRUED INTEREST?
 
Accrued interest is the accumulation of unpaid interest on a bond from the  last
day  on which  interest thereon  was paid.  Interest on  Bonds in  each Trust is
accounted for daily on an accrual basis. For this reason, the purchase price  of
Units  of a Trust will  include not only the Public  Offering Price but also the
proportionate share  of accrued  interest to  the date  of settlement.  Interest
accrues  to the  benefit of Unitholders  commencing with the  settlement date of
their purchase transaction.
 
    Accrued interest does not include accrual of original issue discount on zero
coupon bonds, Stripped Obligations or other original issue discount bonds.  (See
"Summary  of Portfolios--General Trust Information" and  "What Is The Tax Status
of Unitholders.")
 
    In an effort to reduce the  amount of accrued interest that investors  would
have  to pay in addition to the Public Offering Price, the Trustee has agreed to
advance to each Trust the amount of accrued interest due on the Bonds as of  the
Date  of Deposit (which has been designated  the first Record Date for all plans
of distribution).  This accrued  interest will  be paid  to the  Sponsor as  the
holder  of record of  all Units on  the Date of  Deposit. Consequently, when the
Sponsor sells Units of a  Trust, the amount of accrued  interest to be added  to
 
                                      A-17
<PAGE>
the  Public Offering Price to determine the  purchase price of the Units of such
Trust purchased by an investor will include only accrued interest from the  Date
of  Deposit to,  but not  including, the  date of  settlement of  the investor's
purchase (five business days  after purchase), less  any distributions from  the
related  Interest Account.  The Trustee  will recover  its advancements (without
interest or  other cost  to the  Trusts)  from interest  received on  the  Bonds
deposited in each Trust.
 
    The  Trustee has no  cash for distribution to  Unitholders until it receives
interest payments on the Bonds in  the Trusts. Since municipal bond interest  is
accrued  daily but  paid only  semi-annually, during  the initial  months of the
Trusts, the Interest  Accounts, consisting of  accrued but uncollected  interest
and  collected interest  (cash), will  be predominantly  the uncollected accrued
interest that is not available for distribution. However, due to advances by the
Trustee, the Trustee will provide a first distribution between approximately  30
and  60 days after the Date of Deposit. Assuming each Trust retains its original
size and composition  and expenses  and fees  remain the  same, annual  interest
collected  and distributed  will approximate  the estimated  Net Annual Interest
Income stated herein. However,  the amount of accrued  interest at any point  in
time  will  be greater  than  the amount  that  the Trustee  will  have actually
received and distributed to the Unitholders. Therefore, there will always remain
an item of  accrued interest  that is  included in  the Purchase  Price and  the
redemption price of the Units.
 
    Interest  is accounted  for daily and  a proportionate share  of accrued and
undistributed interest computed from the preceding  Record Date is added to  the
daily  valuation of each Unit  of each Trust. (See Sections  3 and 13.) As Bonds
mature, or are redeemed or sold,  the accrued interest applicable to such  bonds
is  collected and subsequently distributed  to Unitholders. Unitholders who sell
or redeem all or a portion of their Units will be paid their proportionate share
of the remaining accrued interest to, but not including, the fifth business  day
following the date of sale or tender.
 
9.  WHAT ARE ESTIMATED LONG TERM RETURN AND ESTIMATED CURRENT RETURN?
 
The  Estimated Long Term Return for each Trust is a measure of the return to the
investor earned over the  estimated life of the  Trust. The Estimated Long  Term
Return represents an average of the yields to maturity (or call) of the Bonds in
the  Trust's portfolio calculated in accordance  with accepted bond practice and
adjusted to reflect expenses  and sales charges.  Under accepted bond  practice,
tax-exempt  bonds are customarily offered to investors on a "yield price" basis,
which involves  computation of  yield to  maturity or  to an  earlier call  date
(whichever  produces the lower yield), and which takes into account not only the
interest payable  on the  bonds but  also  the amortization  or accretion  to  a
specified  date of any premium over or discount from the par (maturity) value in
the bond's  purchase  price. In  calculating  Estimated Long  Term  Return,  the
average  yield for  the Trust's  portfolio is  derived by  weighting 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. Once the average portfolio yield is  computed,
this  figure is then reduced to reflect estimated expenses and the effect of the
maximum  sales  charge  paid  by  investors.  The  Estimated  Long  Term  Return
calculation  does not take into account the effect of a first distribution which
may be less than a  regular distribution or may be  paid at some point after  30
days  (or a second distribution which may be less than a normal distribution for
Unitholders who choose quarterly or  semi-annual plans of distribution), and  it
also  does  not  take into  account  the  difference in  timing  of  payments to
Unitholders who choose quarterly or  semi-annual plans of distribution, each  of
which will reduce the return.
 
    Estimated  Current Return  is computed by  dividing the  Net Annual Interest
Income per Unit by the Public Offering Price. In contrast to Estimated Long Term
Return, Estimated
 
                                      A-18
<PAGE>
Current Return does  not reflect  the amortization  of premium  or accretion  of
discount,  if any, on  the Bonds in  the Trust's portfolio.  Net Annual Interest
Income per Unit  is calculated  by dividing the  annual interest  income to  the
Trust, less estimated expenses, by the number of Units outstanding.
 
    Net  Annual Interest  Income per Unit,  used to  calculate Estimated Current
Return, will vary  with changes  in fees  and expenses  of the  Trustee and  the
Evaluator  and with the redemption, maturity, exchange or sale of Bonds. A Trust
may experience expenses and  portfolio changes different  from those assumed  in
the  calculation of Estimated Long  Term Return. There thus  can be no assurance
that the Estimated Current Returns or Estimated Long Term Returns quoted  herein
will  be  realized  in  the  future.  A  Unitholder's  actual  return  may  vary
significantly from  the  Estimated  Long-Term Return,  based  on  their  holding
period,  market interest  rate changes,  other factors  affecting the  prices of
individual  bonds  in  the  portfolio,  and  differences  between  the  expected
remaining life of portfolio bonds and the actual length of time that they remain
in  the Trust; such actual holding periods  may be reduced by termination of the
Trust, as described in "AMENDMENT AND TERMINATION OF INDENTURE." Since both  the
Estimated  Current Return and  the Estimated Long Term  Return quoted herein are
based on the market value of the  underlying Bonds on the business day prior  to
the  Date of Deposit, subsequent calculations of these performance measures will
reflect the then current market value of the underlying Bonds and may be  higher
or lower.
 
    A  portion of the  monies received by a  Trust may be  treated, in the first
year only, as a return of principal due to the inclusion in the Trust  portfolio
of  "when-issued"  or  other  Bonds  having delivery  dates  after  the  date of
settlement for purchases  made on  the Date of  Deposit. A  consequence of  this
treatment  is that in the computation of  Estimated Current Return for the first
year, such monies are excluded from Net Annual Interest Income and treated as an
adjustment to the Public Offering  Price. (See "Essential Information  Regarding
the Trusts" and Sections 4 and 11.)
 
    For a statement of the Net Annual Interest Income per Unit under the monthly
plan  of  distribution,  and Estimated  Long  Term Yield  and  Estimated Current
Returns based on the Public Offering Prices of the Trusts in this Series, all as
of the day prior  to the Date of  Deposit, see "Essential Information  Regarding
the Trusts."
 
10.  HOW WAS THE PRICE OF THE BONDS DETERMINED AT THE DATE OF DEPOSIT?
 
The prices at which the Bonds deposited in the Trusts would have been offered to
the  public on the business day prior to  the Date of Deposit were determined by
the Trustee on the basis  of an evaluation of such  Bonds prepared by Kenny  S&P
Evaluation  Services, a  division of  J. J.  Kenny Co.,  Inc., a  firm regularly
engaged in the business of  evaluating, quoting or appraising comparable  bonds.
With respect to Bonds in Insured Trusts and insured Bonds in Traditional Trusts,
Kenny  S&P Evaluation Services, a  division of J. J.  Kenny Co., Inc., evaluated
the Bonds as so insured. (See Section 5).
 
    The amount by which  the Trustee's determination of  the OFFERING PRICES  of
the  Bonds deposited  in the Trusts  was greater or  less than the  cost of such
Bonds to  the  Sponsor was  PROFIT  OR LOSS  to  the Sponsor  exclusive  of  any
underwriting  profit.  (See Section  3.) The  Sponsor  also may  realize FURTHER
PROFIT OR  SUSTAIN  FURTHER LOSS  as  a result  of  fluctuations in  the  Public
Offering  Price of the Units. Cash, if  any, made available to the Sponsor prior
to the settlement date for a purchase  of Units, or prior to the acquisition  of
all  Portfolio securities by a Trust, may  be available for use in the Sponsor's
business, and may be of benefit to the Sponsor.
 
                                      A-19
<PAGE>
11.  WHAT IS THE TAX STATUS OF UNITHOLDERS?
 
At the  respective times  of issuance  of  the Bonds  opinions relating  to  the
validity  thereof and to  the exemption of interest  thereon from Federal income
tax were rendered  by bond  counsel to  the respective  issuing authorities.  In
addition,  with respect to  State Trusts, where applicable,  bond counsel to the
issuing authorities rendered opinions  as to the exemption  of interest on  such
Bonds,  when held by residents  of the state in which  the issuers of such Bonds
are located, from state income taxes and certain state or local intangibles  and
local  income taxes.  For a  discussion of  the tax  status of  State Trusts see
"Summary of  Portfolios--  Tax Status"  for  the respective  State  Trust.  (See
Sections  2 and 3.)  Neither the Sponsor  nor its counsel  have made any special
review for the Trusts of the proceedings  relating to the issuance of the  Bonds
or of the basis for the opinions rendered in connection therewith.
 
    Taxpayers  must  disclose  on  their  Federal  tax  returns  the  amount  of
tax-exempt  interest  earned  during  the  year.  Federally  tax-exempt  income,
including  income on Units  of the Trusts,  will be taken  into consideration in
computing the portion, if any, of social security benefits received that will be
included in a taxpayer's gross income subject to the Federal income tax.
 
    Gain realized on the sale or redemption of the Bonds by the Trustee or of  a
Unit  by  a Unitholder  is includable  in  gross income  for Federal  income tax
purposes, and may be  includable in gross income  for state tax purposes.  (Such
gain  does not include  any amounts received  in respect of  accrued interest or
accrued original issue discount, if any.)  A portion of a Unitholder's gain,  to
the extent of accreted market discount, may be treated as ordinary income rather
than capital gain if the Bonds were purchased by a Trust at a market discount or
if  the Unitholder purchased his  or her Units at a  market discount on or after
April 30, 1993. Market discount can arise based on the price the Trust pays  for
the Bonds or the price a Unitholder pays for his or her Units.
 
    In the opinion of Chapman and Cutler, Counsel to the Sponsor, under existing
law:
 
    (1) the  Trusts  are not  associations taxable  as corporations  for Federal
        income tax purposes. Tax-exempt interest received by each of the  Trusts
        on  Bonds  deposited  therein  will  retain  its  status  as  tax-exempt
        interest, for Federal income tax  purposes, when received by the  Trusts
        and  when distributed  to the  Unitholders, except  that the alternative
        minimum tax and  environmental tax (the  "Superfund Tax") applicable  to
        corporate  Unitholders  may, in  certain  circumstances, include  in the
        amount on which  such taxes  are calculated  a portion  of the  interest
        income  received by  the Trust. See  "Certain Tax  Matters Applicable to
        Corporate Unitholders", below;
 
    (2) each Unitholder of a Trust is considered  to be the owner of a pro  rata
        portion  of such Trust under Subpart E, subchapter J of Chapter 1 of the
        Internal Revenue Code of 1986 (the "Code") and will have a taxable event
        when the Trust  disposes of  a Bond or  when the  Unitholder redeems  or
        sells  Units. Unitholders must  reduce the tax basis  of their Units for
        their share of accrued interest received by the Trust, if any, on  Bonds
        delivered  after  the  date the  Unitholders  pay for  their  Units and,
        consequently, such Unitholders may have  an increase in taxable gain  or
        reduction  in capital loss  upon the disposition of  such Units. Gain or
        loss upon the sale or redemption  of Units is measured by comparing  the
        proceeds  of  such sale  or redemption  with the  adjusted basis  of the
        Units. If the  Trustee disposes of  Bonds (whether by  sale, payment  at
        maturity,  redemption or otherwise),  gain or loss  is recognized to the
        Unitholder. The amount of any such gain or loss is measured by comparing
        the Unitholder's  pro  rata  share  of  the  total  proceeds  from  such
        disposition  with  the  Unitholder's  basis for  his  or  her fractional
        interest in  the asset  disposed of.  In the  case of  a Unitholder  who
        purchases    Units,   such   basis   (before   adjustment   for   earned
 
                                      A-20
<PAGE>
        original  issue  discount  and  amortized  bond  premium,  if  any)   is
        determined by apportioning the cost of the Units among each of the Trust
        assets  ratably according to value as of  the date of acquisition of the
        Units. The  tax cost  reduction requirements  of said  Code relating  to
        amortization  of bond premium  may, under some  circumstances, result in
        the Unitholder realizing a taxable gain  when his or her Units are  sold
        or redeemed for an amount equal to their original cost; and
 
    (3) any  amounts paid on defaulted Bonds  held by the Trustee under policies
        of insurance issued with respect to  such Bonds will be excludable  from
        Federal  gross income if, and to the same extent as, such interest would
        have been so excludable if paid by the respective issuer provided  that,
        at  the  time such  policies are  purchased, the  amounts paid  for such
        policies are reasonable,  customary and consistent  with the  reasonable
        expectation  that the issuer of the bonds, rather than the insurer, will
        pay debt  service  on  the  bonds. Paragraph  (2)  of  this  opinion  is
        accordingly   applicable  to   policy  proceeds   representing  maturing
        interest.
 
In the opinion of Carter, Ledyard & Milburn, counsel to the Trustee, and, in the
absence of a New York Trust from the Series, special counsel for the Series  for
New York tax matters, under existing law:
 
        Under  the income tax laws of the State and City of New York, each Trust
    is not an association taxable as a corporation and the income of each  Trust
    will be treated as the income of the Unitholders.
 
    For  a summary of  each opinion of  special counsel to  the respective State
Trusts for state tax matters, see Section 3.
 
    ALL STATEMENTS IN THE PROSPECTUS CONCERNING EXEMPTION FROM FEDERAL, STATE OR
OTHER TAXES ARE THE OPINION OF COUNSEL AND ARE TO BE SO CONSTRUED.
 
    The redemption of Units in a Trust  by a Unitholder would result in each  of
the  remaining Unitholders of said Trust owning a greater proportionate interest
in the remaining assets  of said Trust. Although  present law does not  directly
address  this matter, it  would appear reasonable  that a remaining Unitholder's
tax basis in  his Units would  include his proportionate  share of any  proceeds
received by the Trust on the sale of bonds which were not distributed to him but
were  instead used by  the Trust to redeem  Units and that his  tax basis in the
remaining assets of the  Trust would accordingly be  increased by such share  of
proceeds, based on the relative fair market value of the remaining assets of the
Trust as of the date of such redemption.
 
    Sections  1288 and 1272 of the Code provide a complex set of rules governing
the accrual of original issue discount. These rules provide that original  issue
discount  accrues either on  the basis of  a constant compound  interest rate or
ratably over the term of the Bond, depending on the date the Bond was issued. In
addition, special  rules apply  if the  purchase  price of  a Bond  exceeds  the
original issue price plus the amount of original issue discount which would have
previously  accrued based upon its issue price (its "adjusted issue price"). The
application of these rules will also vary depending on the value of the Bond  on
the  date a Unitholder acquires his Units, and the price the Unitholder pays for
his Units. The  accrual of  tax-exempt original  issue discount  on zero  coupon
bonds  and other original issue discount bonds will result in an increase in the
Unitholder's basis in  such obligations and,  accordingly, in his  basis in  his
Units.
 
    The  Tax Act subjects tax-exempt  bonds to the market  discount rules of the
Code effective for  bonds purchased  after April  30, 1993.  In general,  market
discount is the amount (if any) by which the stated redemption price at maturity
exceeds an investor's purchase price (except to the extent that such difference,
if  any, is attributable to original issue  discount not yet accrued). Under the
Tax   Act,   accretion   of   market    discount   is   taxable   as    ORDINARY
 
                                      A-21
<PAGE>
INCOME;  under prior law, the accretion had been treated as capital gain. Market
discount that  accretes while  the Trust  holds a  Bond would  be recognized  as
ordinary  income by the Unitholders when  principal payments are received on the
Bond, upon sale or at redemption (including early redemption), or upon the  sale
or  redemption of his or her Units, unless a Unitholder elects to include market
discount in taxable income as it accrues. The market discount rules are  complex
and  Unitholders should  consult their  tax advisors  regarding these  rules and
their application.
 
    The Internal Revenue Code provides that interest on indebtedness incurred or
continued to purchase  or carry  obligations, the  interest on  which is  wholly
exempt  from Federal income taxes, is not deductible. Because each Unitholder is
treated for Federal income tax purposes as the owner of a pro rata share of  the
Bonds owned by the applicable Trust, interest on borrowed funds used to purchase
or  carry Units  of such  Trust will  not be  deductible for  Federal income tax
purposes. 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 (however, these rules  generally do not apply to interest
paid on  indebtedness incurred  to purchase  or improve  a personal  residence).
Similar  rules are  generally applicable for  state tax  purposes. Special rules
apply in  the  case  of  certain  financial  institutions  that  acquire  Units.
Investors  with questions regarding  these issues should  consult with their tax
advisers.
 
    In general,  each  issue  of bonds  in  the  Trusts is  subject  to  certain
post-issuance  requirements which must be  met in order for  the interest on the
Bonds to be and remain exempt from Federal income taxation. Bond counsel to each
issuer generally has opined that, assuming continuing compliance by such issuers
with certain covenants, interest on such  Bonds will continue to be exempt  from
Federal income taxation (other than with respect to the application to corporate
Unitholders  of the alternative  minimum tax or the  Superfund Tax, as discussed
below).
 
    For purposes of computing  the alternative minimum  tax for individuals  and
corporations, interest on certain specified tax-exempt private activity bonds is
included as a preference item. The Trusts do not include any such bonds.
 
    For  taxpayers  other than  corporations,  net capital  gains  are presently
subject to a maximum tax  rate of 28 percent. However,  it should be noted  that
legislative proposals are introduced from time to time that affect tax rates and
could affect relative differences at which ordinary income and capital gains are
taxed.
 
    CERTAIN  TAX MATTERS  APPLICABLE TO  CORPORATE UNITHOLDERS.  In the  case of
certain corporations, the alternative minimum  tax and the Superfund Tax  depend
upon the corporation's alternative minimum taxable income ("AMTI"), which is the
corporation's  taxable income  with certain  adjustments. One  of the adjustment
items used in computing AMTI and the Superfund Tax of a corporation (other  than
an S corporation, Regulated Investment Company, Real Estate Investment Trust, or
REMIC)  is an amount equal to 75%  of the excess of such corporation's "adjusted
current earnings" over an amount equal to its AMTI (before such adjustment  item
and  the  alternative tax  net  operation loss  deduction).  Although tax-exempt
interest received by each of the Trusts  on Bonds deposited therein will not  be
included  in the gross  income of corporations for  Federal income tax purposes,
"adjusted current earnings" includes all tax-exempt interest, including interest
on all Bonds in the Trust and tax-exempt original issue discount.
 
    Corporate Unitholders  are urged  to  consult their  own tax  advisers  with
respect  to the particular tax consequences  to them resulting under the Federal
tax law, including the
 
                                      A-22
<PAGE>
corporate alternative minimum tax, the Superfund Tax and the branch profits  tax
imposed by Section 884 of the Code.
 
    EXCEPT  AS NOTED ABOVE AND IN SECTION  3, THE EXEMPTION OF INTEREST ON STATE
AND LOCAL  OBLIGATIONS FOR  FEDERAL  INCOME TAX  PURPOSES DOES  NOT  NECESSARILY
RESULT IN EXEMPTION UNDER THE INCOME OR OTHER TAX LAWS OF ANY STATE OR CITY. THE
LAWS  OF  THE  SEVERAL  STATES  VARY  WITH  RESPECT  TO  THE  TAXATION  OF  SUCH
OBLIGATIONS.
 
12.  WHAT ARE NORMAL TRUST OPERATING EXPENSES?
 
No annual advisory fee is charged the  Trusts by the Sponsor. The Sponsor  does,
however,  receive a fee  of $0.17 per  annum per $1,000  principal amount of the
underlying Bonds  in each  Trust  for regularly  evaluating  the Bonds  and  for
maintaining surveillance over the portfolio. (See Section 16.)
 
    The  Trustee receives for ordinary recurring services an annual fee for each
plan of  distribution for  each Trust  as set  forth in  "Essential  Information
Regarding  the Trusts." Each  annual fee is  per $1,000 principal  amount of the
underlying Bonds in  a Trust for  that portion  of the Trust  that represents  a
particular  plan of distribution. The Trustee's fee may be periodically adjusted
in response to fluctuations in short-term interest rates (reflecting the cost to
the Trustee of advancing funds to  a Trust to meet scheduled distributions)  and
may be further adjusted in accordance with the cumulative percentage increase of
the  United  States Department  of Labor's  Consumer  Price Index  entitled "All
Services Less Rent" since the establishment  of the Trusts. The Trustee has  the
use  of funds, if any, being held in the Interest and Principal Accounts of each
Trust for  future  distributions, payment  of  expenses and  redemptions.  These
Accounts  are non-interest  bearing to  Unitholders. Pursuant  to normal banking
procedures, the Trustee benefits from the use of funds held therein. Part of the
Trustee's compensation for its services to  the Fund is expected to result  from
such use of these funds.
 
    Premiums  for the policies  of insurance obtained  by the Sponsor  or by the
Bond issuers with respect to the Bonds in the Insured Trusts and with respect to
insured Bonds in Traditional Trusts have been paid in full prior to the  deposit
of the Bonds in the Trusts, and the value of such insurance has been included in
the evaluation of the Bonds in each Trust and accordingly in the Public Offering
Price  of Units of each Trust. There  are no annual continuing premiums for such
insurance.
 
    The Sponsor has borne all costs of creating and establishing the Trusts. The
following are  expenses of  the Trusts  and, when  paid by  or are  owed to  the
Trustee,  are secured by  a lien on the  assets of the Trust  or Trusts to which
such expenses are allocable: (1) the expenses and costs of any action undertaken
by the  Trustee to  protect  the Trusts  and the  rights  and interests  of  the
Unitholders;  (2) all taxes and other governmental charges upon the Bonds or any
part of the Trusts (no such taxes or charges are being levied or made or, to the
knowledge of the Sponsor, contemplated); (3)  amounts payable to the Trustee  as
fees  for  ordinary  recurring  services  and  for  extraordinary  non-recurring
services rendered  pursuant to  the Indenture,  all disbursements  and  expenses
including  counsel fees  (including fees of  bond counsel which  the Trustee may
retain) sustained or incurred  by the Trustee in  connection therewith; and  (4)
any  losses or liabilities accruing to the Trustee without negligence, bad faith
or willful misconduct on  its part. The  Trustee is empowered  to sell Bonds  in
order  to  pay  these  amounts  if funds  are  not  otherwise  available  in the
applicable Interest and Principal Accounts.
 
    The Indenture requires each Trust  to be audited on  an annual basis at  the
expense  of the Trust by independent public accountants selected by the Sponsor.
The Trustee  shall not  be  required, however,  to cause  such  an audit  to  be
performed if its cost to a Trust shall exceed
 
                                      A-23
<PAGE>
$.05 per Unit on an annual basis. Unitholders of a Trust covered by an audit may
obtain a copy of the audited financial statements upon request.
 
13.  WHEN ARE DISTRIBUTIONS MADE TO UNITHOLDERS?
 
Interest received by the Trustee on the Bonds in each Trust, including that part
of  the proceeds of  any disposition of Bonds  which represents accrued interest
and including  any insurance  proceeds representing  interest due  on  defaulted
Bonds,  shall be credited to the "Interest  Account" of such Trust and all other
moneys received by the Trustee shall  be credited to the "Principal Account"  of
such Trust.
 
    The  pro rata share of  cash in the Principal Account  in each Trust will be
computed as of each semi-annual Record Date and distributions to the Unitholders
as of such Record Date will be made on or shortly after the fifteenth day of the
month. Proceeds received from the disposition, including sale, call or maturity,
of any of the Bonds and all amounts  paid with respect to zero coupon bonds  and
Stripped  Obligations will be held  in the Principal Account  and either used to
pay for Units  redeemed or distributed  on the Distribution  Date following  the
next semi-annual Record Date. The Trustee is not required to make a distribution
from  the  Principal  Account  of  any Trust  unless  the  amount  available for
distribution in such account equals at least ten cents per Unit.
 
    The pro rata share of the Interest Account in each Trust will be computed by
the Trustee each month as of each Record Date and distributions will be made  on
or  shortly after the fifteenth day of the month to Unitholders of such Trust as
of the Record Date who are entitled to distributions at that time under the plan
of distribution chosen. Persons who purchase  Units between a Record Date and  a
Distribution Date will receive their first distribution on the Distribution Date
following the next Record Date under the applicable plan of distribution.
 
    Purchasers  of  Units  who desire  to  receive interest  distributions  on a
monthly or quarterly basis may elect to do so at the time of purchase during the
initial public offering  period. Those indicating  no choice will  be deemed  to
have  chosen the  semi-annual distribution  plan. All  Unitholders, however, who
purchase Units during the  initial public offering period  and who hold them  of
record on the first Record Date will receive the first distribution of interest.
Thereafter, Record Dates for monthly distributions will be the first day of each
month;  Record  Dates  for quarterly  distributions  will  be the  first  day of
February,  May,  August   and  November;  and   Record  Dates  for   semi-annual
distributions will be the first day of May and November.
 
    Details  of distributions  per Unit  of each  Trust under  the various plans
based upon estimated Net Annual Interest Income at the Date of Deposit are shown
in the tables appearing  in Section 3. The  amount of the regular  distributions
will  remain the same so long as each  Trust portfolio remains the same and fees
and expenses remain the same, and will generally change when Bonds are redeemed,
mature or are sold or when fees and expenses increase or decrease.
 
    The plan of  distribution selected  by a  Unitholder will  remain in  effect
until  changed.  Unitholders  purchasing  Units  in  the  secondary  market will
initially receive distributions  in accordance  with the election  of the  prior
owner.  Unitholders desiring to change  their plan of distribution  may do so by
sending  a   written   notice  requesting   the   change,  together   with   any
Certificate(s),  to  the  Trustee. The  notice  and any  Certificate(s)  must be
received by  the  Trustee not  later  than the  semi-annual  Record Date  to  be
effective   as  of   the  semi-annual  distribution   following  the  subsequent
semi-annual Record  Date. Unitholders  are requested  to make  any such  changes
within  45 days prior to the applicable Record Date. Certificates should only be
sent by registered or certified mail to minimize the possibility of their  being
 
                                      A-24
<PAGE>
lost or stolen. (See Section 18.) If no notice is received in proper form by the
Trustee,  the Unitholder  will be  deemed to have  elected to  continue the same
plan.
 
    As of the first day of each month the Trustee will deduct from the  Interest
Account  of a Trust or, to the extent funds are not sufficient therein, from the
Principal Account of  a Trust, amounts  needed for payment  of expenses of  such
Trust.  The Trustee also may withdraw from said accounts such amount, if any, as
it deems necessary to establish a  reserve for any governmental charges  payable
out  of such Trust. Amounts  so 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 account.
 
    For  the purpose  of minimizing fluctuations  in the  distributions from the
Interest Account of a Trust, the  Trustee is authorized to advance such  amounts
as may be necessary to provide for interest distributions of approximately equal
amounts.  The  Trustee  shall  be reimbursed,  without  interest,  for  any such
advances from funds  in the Interest  Account of such  Trust. The Trustee's  fee
takes  into account the  costs attributable to  the outlay of  capital needed to
make such advances.
 
    The Trustee  shall withdraw  from  the Interest  Account and  the  Principal
Account  of a  Trust such amounts  as may  be necessary to  cover redemptions of
Units of such Trust by the Trustee. (See Section 19.)
 
    Funds which are available for future distributions, redemptions and  payment
of  expenses are held in accounts  which are non-interest bearing to Unitholders
and are available for use by the Trustee pursuant to normal banking procedures.
 
14.  ACCUMULATION PLAN
 
The Sponsor, John Nuveen & Co.  Incorporated, is also the principal  underwriter
of  the  Nuveen Municipal  Bond Fund,  Inc. (the  "Bond Fund"),  Nuveen Tax-Free
Reserves, Inc. ("Tax-Free Reserves"), Nuveen California Tax-Free Fund, Inc. (the
"California Fund"),  Nuveen Tax-Free  Bond Fund,  Inc. ("Tax-Free  Bond  Fund"),
Nuveen  Insured Tax-Free  Bond Fund, Inc.  (the "Insured Bond  Fund") and Nuveen
Tax-Free Money  Market Fund,  Inc.  (the "Money  Market  Fund") and  the  Nuveen
Multistate  Tax-Free  Trust  (the  "Multistate  Trust").  Each  of  these  funds
(together, the  "Accumulation Funds")  is  an open-end,  diversified  management
investment   company  into  which  Unitholders  may  choose  to  reinvest  Trust
distributions automatically,  without any  sales  charge. (Reinvestment  in  the
California  Fund is available only to  Unitholders who are California residents.
Reinvestment in the State Portfolios of the Tax-Free Bond Fund, the Insured Bond
Fund, the  Money Market  Fund and  the  Multistate Trust  is available  only  to
Unitholders  who  are residents  of  the states  for  which such  portfolios are
named.) Unitholders may  reinvest both interest  and principal distributions  or
principal  distributions only. Each Accumulation  Fund has investment objectives
which differ in  certain respects from  those of  the Trusts and  may invest  in
securities which would not be eligible for deposit in the Trusts. The investment
adviser  to  each Accumulation  Fund is  Nuveen  Advisory Corp.,  a wholly-owned
subsidiary of  the  Sponsor. The  following  is  a general  description  of  the
investment  objectives  and  policies  of each  Accumulation  Fund.  For  a more
detailed description, Unitholders should read the prospectus of the Accumulation
Fund in which they are interested.
 
THE BOND FUND
 
    The Bond  Fund has  the  objective of  providing,  through investment  in  a
professionally  managed portfolio of long-term municipal  bonds, as high a level
of current interest income exempt from Federal income tax as is consistent  with
preservation  of capital. The Bond Fund  may include in its portfolio tax-exempt
bonds rated Baa or BBB or better by Moody's or Standard & Poor's, unrated  bonds
which,  in the  opinion of the  investment adviser,  have credit characteristics
equivalent  to  bonds  rated  Baa  or  BBB  or  better,  and  certain  temporary
 
                                      A-25
<PAGE>
investments,  including securities the interest income from which may be subject
to Federal income tax.
 
TAX-FREE RESERVES
 
    Tax-Free Reserves is a  "money market" fund that  includes in its  portfolio
only  obligations  maturing  within  one  year  from  the  date  of acquisition,
maintains an average maturity of all investments of 120 days or less, values its
portfolio at amortized cost and seeks to maintain a net asset value of $1.00 per
share. It provides checkwriting and expedited wire redemption privileges for its
shareholders.  Tax-Free  Reserves  has  the  objective  of  providing,   through
investment  in  a professionally  managed portfolio  of high  quality short-term
municipal obligations, as high  a level of current  interest income exempt  from
Federal  income  tax  as is  consistent  with  preservation of  capital  and the
maintenance of  liquidity.  Tax-Free  Reserves  may  include  in  its  portfolio
municipal obligations rated Aaa, Aa, MIG-1, VMIG-1 or Prime-1 by Moody's or AAA,
AA, SP-1 or A-1 by Standard & Poor's, unrated municipal obligations that, in the
opinion  of the  investment adviser,  have credit  characteristics equivalent to
obligations  rated  as  above,  tax-exempt   obligations  backed  by  the   U.S.
Government, and temporary investments that may be subject to Federal income tax.
 
THE CALIFORNIA FUND
 
    The  California Fund has  the objective of  providing, through investment in
professionally managed portfolios of California municipal obligations, as high a
level of current interest income exempt from both Federal and California  income
taxes as is consistent with the investment policies of each of the portfolios of
the  California Fund  and with  preservation of  capital. Each  portfolio of the
California Fund may include  temporary investments that may  be subject to  tax.
California Unitholders may reinvest in one of three portfolios of the California
Fund:  The Nuveen California Tax-Free Value  Fund, the Nuveen California Insured
Tax-Free Value Fund and the Nuveen California Tax-Free Money Market Fund.
 
    The Nuveen California  Tax-Free Value  Fund invests  primarily in  long-term
investment  grade California  tax-exempt bonds  (I.E., bonds  rated in  the four
highest categories by  Moody's or Standard  & Poor's or,  if unrated, that  have
equivalent credit characteristics). The Nuveen California Insured Tax-Free Value
Fund  invests primarily  in the  same type  of investments  as the  Special Bond
Portfolio, each of which is covered by insurance guaranteeing the timely payment
of principal  and  interest  or  is  backed by  a  deposit  of  U.S.  Government
securities.
 
    The  Nuveen  California  Tax-Free  Money Market  Fund  invests  primarily in
high-quality short term  California tax-exempt money  market instruments  (I.E.,
obligations  rated in the two highest categories by Moody's or Standard & Poor's
or, if unrated,  that have  equivalent credit  characteristics). This  portfolio
will  include  only  obligations  maturing  within one  year  from  the  date of
acquisition, will maintain an average maturity of all investments of 120 days or
less, will value its portfolio at amortized cost and will seek to maintain a net
asset value of $1.00 per share. The Nuveen California Tax-Free Money Market Fund
provides for an expedited wire redemption privilege.
 
THE TAX-FREE BOND FUND
 
    The Tax-Free Bond Fund consists  of the Nuveen Massachusetts Tax-Free  Value
Fund,  the Nuveen New York  Tax-Free Value Fund, the  Nuveen Ohio Tax-Free Value
Fund, and the Nuveen  New Jersey Tax-Free Value  Fund, which are each  available
for  reinvestment to Unitholders who  are residents of the  state for which such
portfolio is  named. The  Tax-Free Bond  Fund has  the objective  of  providing,
through  investment in a professionally managed portfolio of municipal bonds, as
high a level of current interest income exempt both from Federal income tax  and
from   the  income  tax   imposed  by  each   portfolio's  designated  state  as
 
                                      A-26
<PAGE>
is consistent with preservation of capital.  The Tax-Free Bond Fund may  include
in  each of its portfolios tax-exempt bonds  rated Baa or BBB or better; unrated
bonds  which,  in   the  opinion   of  the  investment   adviser,  have   credit
characteristics  equivalent to  bonds rated  Baa or  BBB or  better; and certain
temporary investments, including securities the  interest income from which  may
be subject to Federal and state income tax.
 
THE INSURED BOND FUND
 
    The  Insured Bond Fund  consists of the Nuveen  Insured Municipal Bond Fund,
the Nuveen Massachusetts  Insured Tax-Free Value  Fund and the  Nuveen New  York
Insured  Tax-Free  Value  Fund, which  are  each available  for  reinvestment to
Unitholders. (The Massachusetts and  New York Portfolios  are available only  to
those  Unitholders who  are residents  of the state  for which  the portfolio is
named.) The Insured Bond Fund has the objective of providing, through investment
in professionally managed  portfolios of  municipal bonds,  as high  a level  of
current  interest income exempt from both Federal income tax and, in the case of
designated state portfolios,  from the  income tax imposed  by each  portfolio's
designated  state, as  is consistent with  preservation of  capital. The Insured
Bond Fund may include in each of its portfolios the same type of investments  as
the  Tax-Free Bond Fund, each of which  is covered by insurance guaranteeing the
timely payment of  principal and  interest or  is backed  by a  deposit of  U.S.
Government securities.
 
THE MONEY MARKET FUND
 
    The  Money Market Fund  consists of the  Nuveen Massachusetts Tax-Free Money
Market Fund and the Nuveen New York  Tax-Free Money Market Fund, which are  each
available  for reinvestment  to Unitholders who  are residents of  the state for
which such portfolio is named. The Money Market Fund includes in its  portfolios
only  obligations  maturing  within  one  year  from  the  date  of acquisition,
maintains an average  maturity of  120 days or  less, values  its portfolios  at
amortized  cost and seeks to maintain a net  asset value of $1.00 per share. The
Money Market  Fund  has  the  objective  of  providing,  through  investment  in
professionally   managed  portfolios   of  high   quality  short-term  municipal
obligations, as high a level of current interest income exempt both from Federal
income tax and from the income tax imposed by each portfolio's designated  state
as  is consistent with stability of  principal and the maintenance of liquidity.
The  Money  Market  Fund  may  include  in  each  of  its  portfolios  municipal
obligations  rated Aaa, Aa, MIG-1, MIG-2, VMIG-1,  VMIG-2, Prime 1 or Prime 2 by
Moody's or  AAA, AA,  SP-1,  SP-2, A-1  or A-2  by  Standard &  Poor's;  unrated
municipal  obligations  that, in  the opinion  of  the investment  adviser, have
credit characteristics equivalent to obligations  rated as above; and  temporary
investments that may be subject to Federal and state income tax.
 
THE MULTISTATE TRUST
 
    The Multistate Trust consists of the Nuveen Arizona Tax-Free Value Fund, the
Nuveen Florida Tax-Free Value Fund, the Nuveen Maryland Tax-Free Value Fund, the
Nuveen  Michigan Tax-Free Value Fund, the Nuveen New Jersey Tax-Free Value Fund,
the Nuveen Pennsylvania  Tax-Free Value Fund  and the Nuveen  Virginia Tax  Free
Value  Fund, which  are each available  for reinvestment to  Unitholders who are
residents of the state for which  such portfolio is named. The Multistate  Trust
has  the objective of providing, through  investment in a professionally managed
portfolio of municipal bonds, as high a level of current interest income  exempt
from  both regular Federal  income tax and the  applicable state personal income
tax as is  consistent with  preservation of  capital. The  Multistate Trust  may
include  in each  of its  portfolios tax-exempt  bonds rated  "Baa" or  "BBB" or
better, unrated bonds  which, in  the opinion  of the  investment advisor,  have
credit  characteristics  equivalent to  bonds rated  "baa"  or "BBB"  or better,
limited to no more than 20% of the Multistate Trust's
 
                                      A-27
<PAGE>
assets, and certain  temporary investments that  may be subject  to Federal  and
state income tax.
 
    Each  person who purchases Units of a  Trust may become a participant in the
Accumulation Plan and elect  to have his  or her distributions  on Units of  the
Trust  invested directly in shares of one of the Accumulation Funds. Reinvesting
Unitholders  may  select  any  interest  distribution  plan.  Thereafter,   each
distribution  of  interest  income  or  principal  on  the  participant's  Units
(principal only in  the case of  a Unitholder  who has chosen  to reinvest  only
principal  distributions) will, on the applicable distribution date, or the next
day on which the New  York Stock Exchange is  normally open ("business day")  if
the  distribution  date is  not  a business  day,  automatically be  received by
Shareholder Services, Inc., transfer agent  for each of the Accumulation  Funds,
on  behalf of such participant  and applied on that  date to purchase shares (or
fractions thereof)  of  the Accumulation  Fund  chosen  at net  asset  value  as
computed  as of 4:00 p.m. eastern time on each such date. All distributions will
be reinvested  in the  Accumulation Fund  chosen  and no  part thereof  will  be
retained  in a separate  account. These purchases  will be made  without a sales
charge.
 
    Shareholder Services, Inc. will mail to each participant in the Accumulation
Plan a quarterly  statement containing  a record of  all transactions  involving
purchases of Accumulation Fund shares (or fractions thereof) with Trust interest
distributions or as a result of reinvestment of Accumulation Fund dividends. Any
distribution  of principal used to purchase  shares of an Accumulation Fund will
be separately  confirmed by  Shareholder Services,  Inc. Unitholders  will  also
receive   distribution  statements  from  the   Trustee  detailing  the  amounts
transferred to their Accumulation Fund accounts.
 
    Participants may at any time, by so notifying the Trustee in writing,  elect
to  change  the  Accumulation  Fund into  which  their  distributions  are being
reinvested, to change from principal  only reinvestment to reinvestment of  both
principal and interest or vice versa, or to terminate their participation in the
Accumulation  Plan altogether and receive future distributions on their Units in
cash. There will be no  charge or other penalty for  such change of election  or
termination.
 
    The  character of  Trust distributions for  income tax  purposes will remain
unchanged even if they are reinvested in an Accumulation Fund.
 
15.  HOW DETAILED ARE REPORTS TO UNITHOLDERS?
 
The Trustee  shall  furnish Unitholders  of  a  Trust in  connection  with  each
distribution,  a statement of the amount of  interest and, if any, the amount of
other receipts (received  since the preceding  distribution) being  distributed,
expressed  in each case  as a dollar  amount representing the  pro rata share of
each Unit of a Trust outstanding and a year to date summary of all distributions
paid on said Units.  Within a reasonable  period of time after  the end of  each
calendar  year, the Trustee shall furnish to  each person who at any time during
the calendar  year was  a registered  Unitholder  of a  Trust a  statement  with
respect  to  such  Trust  (i)  as to  the  Interest  Account:  interest received
(including amounts  representing  interest  received  upon  any  disposition  of
Bonds),  and, except  for any  State Trust, the  percentage of  such interest by
states in which the issuers  of the Bonds are  located, deductions for fees  and
expenses of such Trust, redemption of Units and the balance remaining after such
distributions  and deductions,  expressed in  each case  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; (ii)  as to the
Principal Account: the dates  of disposition of any  Bonds and the net  proceeds
received  therefrom (excluding  any portion representing  accrued interest), the
amount paid for purchase of Replacement  Bonds, the amount paid upon  redemption
of  Units, deductions for payment  of applicable taxes and  fees and expenses of
the Trustee, 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
 
                                      A-28
<PAGE>
Unit outstanding on the last business day of such calendar year; (iii) a list of
the Bonds held and the number of  Units outstanding on the last business day  of
such  calendar year; (iv) the Unit Value based upon the last computation thereof
made during such calendar year; and (v) amounts actually distributed during such
calendar year  from  the  Interest  Account  and  from  the  Principal  Account,
separately  stated, expressed both as total dollar amounts and as dollar amounts
representing the pro rata share of each Unit outstanding.
 
    Each annual statement will reflect  pertinent information in respect of  all
plans  of distribution so that Unitholders may be informed regarding the results
of other plans of distribution.
 
16.  UNIT VALUE AND EVALUATION
 
The value of each  Trust is determined by  the Sponsor on the  basis of (1)  the
cash  on hand in the Trust or moneys  in the process of being collected, (2) the
value of the Bonds  in the Trust based  on the BID prices  of the Bonds and  (3)
interest   accrued  thereon  not   subject  to  collection,   LESS  (1)  amounts
representing taxes or governmental charges payable out of the Trust and (2)  the
accrued  expenses of the Trust. The result of such computation is divided by the
number of Units of such  Trust outstanding as of  the date thereof to  determine
the  per Unit value ("Unit Value") of  such Trust. The Sponsor may determine the
value of the Bonds in each 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) if  bid prices are not available for any of  the
Bonds, on the basis of bid prices for comparable bonds, (3) by causing the value
of  the Bonds to be determined by  others engaged in the practice of evaluating,
quoting or appraising comparable bonds or  (4) by any combination of the  above.
Although  the Unit Value of each Trust is  based on the BID prices of the Bonds,
the Units are sold initially to the public at the Public Offering Price based on
the OFFERING prices of the Bonds.
 
    Because the insurance  obtained by the  Sponsor or by  the issuers of  Bonds
with  respect to  the Bonds in  the Insured  Trusts and with  respect to insured
Bonds in Traditional Trusts is effective so long as such Bonds are  outstanding,
such  insurance will be taken  into account in determining  the bid and offering
prices of such  Bonds and therefore  some value attributable  to such  insurance
will be included in the value of Units of Trusts that include such Bonds.
 
17.  HOW UNITS OF THE TRUSTS ARE DISTRIBUTED TO THE PUBLIC
 
John Nuveen & Co. Incorporated is the Sponsor and sole Underwriter of the Units.
It  is  the  intention  of  the  Sponsor  to  qualify  Units  of  National, Long
Intermediate, Intermediate, Short  Intermediate and Short  Term Trusts for  sale
under  the laws of  substantially all of  the states, and  Units of State Trusts
only in the state for which the Trust is named and selected other states.
 
    Promptly following the deposit of Bonds in exchange for Units of the Trusts,
it is the practice of the Sponsor to place all of the Units as collateral for  a
letter or letters of credit from one or more commercial banks under an agreement
to  release such Units from time to  time as needed for distribution. Under such
an arrangement  the Sponsor  pays  such banks  compensation  based on  the  then
current  interest  rate. This  is a  normal  warehousing arrangement  during the
period of distribution of the Units to public investors.
 
    The Sponsor plans to allow a  discount to brokers and dealers in  connection
with   the  primary  distribution   of  Units  and   also  in  secondary  market
transactions. The primary market discounts are as follows:
 
                                      A-29
<PAGE>
 
<TABLE>
<CAPTION>
                                                         DISCOUNT PER UNIT
                                --------------------------------------------------------------------
<S>                             <C>         <C>            <C>            <C>            <C>
                                 NATIONAL    LONG INTER-                  SHORT INTER-
                                AND STATE      MEDIATE     INTERMEDIATE      MEDIATE     SHORT TERM
NUMBER OF UNITS*                  TRUSTS       TRUSTS         TRUSTS         TRUSTS        TRUSTS
- ------------------------------  ----------  -------------  -------------  -------------  -----------
Less than 500.................    $3.20         $2.90          $2.70          $2.00         $1.50
500 but less than 1,000.......     3.20         2.90           2.70           2.00          1.50
1,000 but less than 2,500.....     3.20         2.70           2.50           1.80          1.30
2,500 but less than 5,000.....     3.20         2.45           2.25           1.55          1.05
5,000 but less than 10,000....     2.50         2.45           2.25           1.55          1.05
10,000 but less than 25,000...     2.00         2.00           2.00           1.30           .80
25,000 but less than 50,000...     1.75         1.75           1.75           1.30           .60
50,000 or more................     1.75         1.50           1.50           1.00           .60
</TABLE>
 
*Breakpoint sales charges and related dealer concessions are computed both on  a
 dollar  basis and  on the  basis of  the number  of Units  purchased, using the
 equivalent of 500 Units to  $50,000, 2,500 Units to  $250,000 etc. and will  be
 applied on that basis which is more favorable to the purchaser.
 
    The  Sponsor currently intends  to maintain a secondary  market for Units of
each Trust. See  Section 7.  The amount of  the dealer  concession on  secondary
market  purchases of Trust Units through the Sponsor will be computed based upon
the value  of the  Bonds in  the  Trust portfolio,  including the  sales  charge
computed as described in Section 6, and adjusted to reflect the cash position of
the  Trust principal  account, and will  vary with  the size of  the purchase as
shown in the following table:
 
<TABLE>
<CAPTION>
                                                               AMOUNT OF PURCHASE*
                            -----------------------------------------------------------------------------------------
<S>                         <C>        <C>        <C>        <C>        <C>        <C>         <C>         <C>
                                        $50,000   $100,000   $250,000   $500,000   $1,000,000  $2,500,000
                              UNDER       TO         TO         TO         TO          TO          TO      $5,000,000
YEARS TO MATURITY            $50,000    $99,999   $249,999   $499,999   $999,999   $2,499,999  $4,999,999   OR MORE
- --------------------------  ---------  ---------  ---------  ---------  ---------  ----------  ----------  ----------
Less than 1...............      0          0          0          0          0          0           0           0
1 but less than 2.........    1.00%      .90%       .85%       .80%       .70%        .55%       .467%       .389%
2 but less than 3.........    1.30%      1.20%      1.10%      1.00%      .90%        .73%       .634%       .538%
3 but less than 4.........    1.60%      1.45%      1.35%      1.25%      1.10%       .90%       .781%       .662%
4 but less than 5.........    2.00%      1.85%      1.75%      1.55%      1.40%      1.25%       1.082%      .914%
5 but less than 7.........    2.30%      2.15%      1.95%      1.80%      1.65%      1.50%       1.320%      1.140%
7 but less than 10........    2.60%      2.45%      2.25%      2.10%      1.95%      1.70%       1.496%      1.292%
10 but less than 13.......    3.00%      2.80%      2.60%      2.45%      2.30%      2.00%       1.747%      1.494%
13 but less than 16.......    3.25%      3.15%      3.00%      2.75%      2.50%      2.15%       1.878%      1.606%
16 or more................    3.50%      3.50%      3.40%      3.35%      3.00%      2.50%       2.185%      1.873%
</TABLE>
 
 *Breakpoint sales charges and related dealer concessions are computed both on a
  dollar basis and  on the basis  of the  number of Units  purchased, using  the
  equivalent of 500 Units to $50,000, 2,500 Units to $250,000, etc., and will be
  applied on that basis which is more favorable to the purchaser.
 
    The  Sponsor reserves the  right to change  the foregoing dealer concessions
from time to time.
 
    Registered investment advisers, certified financial planners and  registered
broker-dealers  who  in  each case  either  charge periodic  fees  for financial
planning, investment  advisory or  asset management  services, or  provide  such
services in connection with the establishment of an investment account for which
a  comprehensive  "wrap  fee"  charge is  imposed,  and  bank  trust departments
investing funds  over which  they  exercise exclusive  discretionary  investment
authority  and  that  are held  in  a  fiduciary, agency,  custodial  or similar
capacity, are  not entitled  to receive  any dealer  concession for  primary  or
secondary market purchases in which an investor purchases any number of Units at
the  Public Offering Price for non-breakpoint purchases minus the concession the
sponsor typically allows  to brokers  and dealers  for non-breakpoint  purchases
(see Section 6).
 
    Certain  commercial banks are making Units  of the Trusts available to their
customers on  an agency  basis. A  portion of  the sales  charge paid  by  these
customers  is retained by or  remitted to the banks in  the amounts shown in the
above table. The Glass-Steagall Act
 
                                      A-30
<PAGE>
prohibits banks from  underwriting Trust  Units; the Act  does, however,  permit
certain agency transactions and banking regulators have not indicated that these
particular  agency transactions are not permitted under the Act. In Texas and in
certain other states, any  bank making Units available  must be registered as  a
broker-dealer under state law.
 
    To  facilitate the handling of transactions, sales of Units shall be limited
to transactions involving a minimum of  either $5,000 or 50 Units, whichever  is
less.  The Sponsor reserves the right to reject,  in whole or in part, any order
for the purchase of Units.
 
18.  OWNERSHIP AND TRANSFER OF UNITS
 
The ownership of  Units is  evidenced by book  entry positions  recorded on  the
books  and records of the Trustee  unless the Unitholder expressly requests that
the purchased Units be evidenced in Certificate form. The Trustee is  authorized
to treat as the owner of Units that person who at the time is registered as such
on  the books of the Trustee. Any  Unitholder who holds a Certificate may change
to book entry ownership by submitting to the Trustee the Certificate along  with
a written request that the Units represented by such Certificate be held in book
entry form. Likewise, a Unitholder who holds Units in book entry form may obtain
a  Certificate for such  Units by written  request to the  Trustee. Units may be
held in denominations of one Unit or any multiple or fraction thereof. Fractions
of Units are computed to three  decimal places. Any Certificates issued will  be
numbered  serially for identification, and are  issued in fully registered form,
transferable only  on the  books of  the Trustee.  Book entry  Unitholders  will
receive a Book Entry Position Confirmation reflecting their ownership.
 
    Certificates  for  Units will  bear an  appropriate  notation on  their face
indicating which plan of distribution has been selected. When a change is  made,
the   existing  Certificates  must  be  surrendered   to  the  Trustee  and  new
Certificates issued to  reflect the  currently effective  plan of  distribution.
There will be no charge for this service. Holders of book entry Units can change
their  plan of distribution  by making a  written request to  the Trustee, which
will issue a new Book Entry Position Confirmation to reflect such change.
 
    Units are transferable by  making a written request  to the Trustee and,  in
the  case of Units  evidenced by Certificate(s),  by presenting and surrendering
such Certificate(s) to the  Trustee, at its corporate  trust office in New  York
City, properly endorsed or accompanied by a written instrument or instruments of
transfer. The Certificate(s) should be sent registered or certified mail for the
protection  of the Unitholder.  Each Unitholder must  sign such written request,
and such Certificate(s) or transfer instrument,  exactly as his name appears  on
(a)  the face of the Certificate(s) representing the Units to be transferred, or
(b) the  Book  Entry  Position  Confirmation(s) relating  to  the  Units  to  be
transferred.  Such signature(s) must be guaranteed  by a guarantor acceptable to
the Trustee. 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.  Mutilated Certificates must  be surrendered to  the Trustee in order
for a replacement Certificate to be issued.
 
    Although at the date hereof  no charge is made  and none is contemplated,  a
Unitholder  may be  required to  pay $2.00 to  the Trustee  for each Certificate
reissued or transfer of Units requested and to pay any governmental charge which
may be imposed in connection therewith.
 
REPLACEMENT OF LOST, STOLEN OR DESTROYED CERTIFICATES.
 
    To obtain a  new Certificate replacing  one that has  been lost, stolen,  or
destroyed,   the   Unitholder   must  furnish   the   Trustee   with  sufficient
indemnification and pay such expenses as the Trustee may incur.
 
                                      A-31
<PAGE>
    The indemnification protects the  Trustee, Sponsor, and  Trust from risk  if
the original Certificate is presented for transfer or redemption by a person who
purchased  it  in good  faith,  for value  and without  notice  of any  fraud or
irregularity.
 
    This indemnification  must  be  in the  form  of  an Open  Penalty  Bond  of
Indemnification.  The premium for such  an indemnity bond may  vary from time to
time, but currently amounts to 1% of  the market value of the Units  represented
by  the Certificate.  In the  case however,  of a  Trust as  to which  notice of
termination has been given, the premium currently amounts to 0.5% of the  market
value of the Units represented by such Certificate.
 
19.  HOW UNITS MAY BE REDEEMED WITHOUT CHARGE
 
Unitholders  may redeem all or a portion of  their Units by (1) making a written
request for such redemption (book entry Unitholders may use the redemption  form
on the reverse side of their Book Entry Position Confirmation) to the Trustee at
its  corporate trust office in New York City (redemptions of 1,000 Units or more
will require a signature  guarantee), (2) in  the case of  Units evidenced by  a
Certificate, by also tendering such Certificate to the Trustee, duly endorsed or
accompanied  by  proper instruments  of transfer  with signatures  guaranteed as
explained in  Section  18 above,  and  (3) payment  of  applicable  governmental
charges,  if any.  Certificates should be  sent only by  registered or certified
mail to minimize  the possibility of  their being  lost or stolen.  In order  to
effect  a  redemption of  Units evidenced  by a  Certificate, a  Unitholder must
tender the Certificate to the Trustee or provide satisfactory indemnity required
in connection with lost, stolen or  destroyed Certificates (See Section 18).  No
redemption  fee will be charged. A Unitholder may authorize the Trustee to honor
telephone instructions for  the redemption  of Units  held in  book entry  form.
Units represented by Certificates may not be redeemed by telephone. The proceeds
of Units redeemed by telephone will be sent by check either to the Unitholder at
the  address specified on his account or to a financial institution specified by
the Unitholder for credit to the account of the Unitholder. A Unitholder wishing
to  use  this  method  of  redemption  must  complete  a  Telephone   Redemption
Authorization  Form and  furnish the Form  to the  Trustee. Telephone Redemption
Authorization  Forms   can   be   obtained  from   a   Unitholder's   registered
representative  or by calling the  Trustee. Once the completed  Form is on file,
the Trustee  will honor  telephone redemption  requests by  any person.  If  the
telephone  redemption request is  received prior to 4:00  p.m. eastern time, the
Unitholder will be  entitled to receive  for each Unit  tendered the  Redemption
Price  as determined above.  A telephone redemption  request received after 4:00
p.m. eastern time will be treated as having been received the following business
day. The redemption proceeds will be mailed within seven calendar days following
the telephone redemption  request. Telephone  redemptions are  limited to  1,000
Units  or less. Only  Units held in the  name of individuals  may be redeemed by
telephone; accounts registered in  broker name, or  accounts of corporations  or
fiduciaries   (including  among  others,   trustees,  guardians,  executors  and
administrators) may not use the telephone redemption privilege.
 
    On the seventh calendar day following the date of tender, or if the  seventh
calendar day is not a business day, on the first business day prior thereto, the
Unitholder  will be entitled to receive in cash for each Unit tendered an amount
equal to the Unit Value of such Trust determined by the Trustee, as of 4:00 p.m.
eastern time on the date of  tender as defined hereafter, plus accrued  interest
to,  but  not  including,  the  fifth business  day  after  the  date  of tender
("Redemption Price"). The  price received upon  redemption may be  more or  less
than  the amount paid by  the Unitholder depending on the  value of the Bonds on
the date of  tender. Such  value will vary  with market  and credit  conditions,
including  changes in  interest rate levels.  Unitholders should  check with the
Trustee or  their broker  to  determine the  Redemption Price  before  tendering
Units.
 
                                      A-32
<PAGE>
    While the Trustee has the power to determine Redemption Price when Units are
tendered,  the authority has by  practice been delegated by  the Trustee to John
Nuveen & Co.  Incorporated, which  determines the  Redemption Price  on a  daily
basis.
 
    The  "date of  tender" is  deemed to be  the date  on which  the request for
redemption of Units is received  in proper form by  the Trustee, except that  as
regards a redemption request received after 4:00 p.m. eastern time or on any day
on  which the New York  Stock Exchange (the "Exchange")  is normally closed, the
date of tender  is the  next day  on which such  Exchange is  normally open  for
trading  and such request will be  deemed to have been made  on such day and the
redemption will be effected at the Redemption Price computed on that day.
 
    Accrued interest paid  on redemption  shall be withdrawn  from the  Interest
Account  of the  appropriate Trust or,  if the balance  therein is insufficient,
from the Principal Account of such  Trust. All other amounts paid on  redemption
shall  be withdrawn from the Principal Account. The Trustee is empowered to sell
underlying Bonds of  a Trust in  order to make  funds available for  redemption.
(See Section 21.) Units so redeemed shall be cancelled.
 
    To  the extent that Bonds  are sold from a Trust,  the size and diversity of
such Trust will  be reduced. Such  sales may be  required at a  time when  Bonds
would  not  otherwise  be sold  and  might  result in  lower  prices  than might
otherwise be realized.
 
    The Redemption Price is  determined on the  basis of the  BID prices of  the
Bonds  in each Trust, while  the initial Public Offering  Price of Units will be
determined on the  basis of the  OFFERING prices of  the Bonds as  of 4:00  p.m.
eastern  time on any day on which the  Exchange is normally open for trading and
such determination is made. As of any given time, the difference between the bid
and offering  prices of  such Bonds  may  be expected  to average  1% to  2%  of
principal  amount in the case of Bonds  in National, Long Intermediate and State
Trusts, 3/4%  to  1  1/2% in  the  case  of Bonds  in  Intermediate,  and  Short
Intermediate  Trusts and 1/2% to 3/4% in the case of Bonds in Short Term Trusts.
In the case of actively traded Bonds, the difference may be as little as 1/4  to
1/2  of 1%, and in  the case of inactively  traded Bonds such difference usually
will not exceed 3%. The difference between the aggregate offering prices of  the
Bonds  in each Trust  and the aggregate  bid prices thereof  on the business day
prior to  the Date  of Deposit  is shown  in the  discussion of  specific  trust
matters.
 
    The  right  of redemption  may be  suspended and  payment postponed  for any
period during  which  the Securities  and  Exchange Commission  determines  that
trading  in the municipal bond market is restricted or 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.
 
    Under  regulations issued by the Internal  Revenue Service, the Trustee will
be required to withhold 31% of the principal amount of a Unit redemption if  the
Trustee  has not  been furnished  the redeeming  Unitholder's tax identification
number in the  manner required by  such regulations. Any  amount so withheld  is
transmitted  to  the  Internal  Revenue  Service and  may  be  recovered  by the
Unitholder only when filing  his or her tax  return. Under normal  circumstances
the  Trustee obtains the Unitholder's tax identification number from the selling
broker at the time the Certificate or Book Entry Return Confirmation is  issued,
and  this number is printed on the Certificate or Book Entry Return Confirmation
and on distribution statements. If a Unitholder's tax identification number does
not appear as  described above,  or if it  is incorrect,  the Unitholder  should
contact  the Trustee before redeeming Units to determine what action, if any, is
required to avoid this "back-up withholding."
 
20.  HOW UNITS MAY BE PURCHASED BY THE SPONSOR
 
The Trustee will notify the  Sponsor of any tender  of Units for redemption.  If
the  Sponsor's bid in  the secondary market  at that time  equals or exceeds the
Redemption Price it may
 
                                      A-33
<PAGE>
purchase such Units by notifying the Trustee before the close of business on the
second succeeding business day and by making payment therefor to the  Unitholder
not  later than the day  on which payment would otherwise  have been made by the
Trustee. (See  Section 19.)  The Sponsor's  current practice  is to  bid at  the
Redemption  Price in  the secondary  market. Units  held by  the Sponsor  may be
tendered to the Trustee for redemption as any other Units.
 
    The Public Offering  Price upon  resale of any  Units thus  acquired by  the
Sponsor  will be  calculated in accordance  with the procedure  described in the
then currently effective prospectus relating to such Units. Any profit resulting
from the resale of  such Units will  belong to the  Sponsor which likewise  will
bear  any loss resulting from a lower  Public Offering Price or Redemption Price
subsequent to its acquisition of such Units.
 
21.  HOW BONDS MAY BE REMOVED FROM THE TRUSTS
 
Bonds will be removed from a Trust as they mature or are redeemed by the issuers
thereof. See  the "Schedules  of Investments"  and "General  Trust  Information"
under Section 3 for a discussion of call provisions of portfolio Bonds.
 
    The  Indenture also empowers  the Trustee to  sell Bonds for  the purpose of
redeeming Units tendered by any Unitholder, and for the payment of expenses  for
which  income may not be available. Under the Indenture the Sponsor is obligated
to provide the Trustee with a current list of Bonds in each Trust to be sold  in
such  circumstances. In deciding which Bonds  should be sold the Sponsor intends
to consider, among  other things, such  factors as: (1)  market conditions;  (2)
market  prices  of  the  Bonds;  (3)  the  effect  on  income  distributions  to
Unitholders of the sale of various Bonds; (4) the effect on principal amount  of
underlying  Bonds  per Unit  of the  sale  of various  Bonds; (5)  the financial
condition of the issuers; and (6) the effect of the sale of various Bonds on the
investment character of the Trust. Such sales, if required, could result in  the
sale  of Bonds by the Trustee at prices less than original cost to the Trust. To
the extent Bonds are sold, the size and diversity of such Trust will be reduced.
 
    In addition, the  Sponsor is empowered  to direct the  Trustee to  liquidate
Bonds upon the happening of certain other events, such as default in the payment
of principal and/or interest, an action of the issuer that will adversely affect
its  ability to continue payment of the  principal of and interest on its Bonds,
or an  adverse  change  in  market, revenue  or  credit  factors  affecting  the
investment  character of the Bonds. If a default in the payment of the principal
of and/or interest  on any  of the  Bonds occurs, and  if the  Sponsor fails  to
instruct  the Trustee whether to  sell or continue to  hold such Bonds within 30
days after  notification by  the Trustee  to the  Sponsor of  such default,  the
Indenture  provides that  the Trustee shall  liquidate said  Bonds forthwith and
shall not be liable for any loss so incurred.
 
    In connection with its  determination as to the  sale or liquidation of  any
Bonds,  the Sponsor  will consider the  Bond's then current  rating, but because
such ratings are the opinions of the rating agencies as to the quality of  Bonds
they  undertake to rate and not absolute  standards of quality, the Sponsor will
exercise its independent judgment as to Bond creditworthiness.
 
    The Sponsor may also direct the Trustee to liquidate Bonds in a Trust if the
Bonds in  the  Trust  are  the  subject  of  an  advanced  refunding,  generally
considered  to be when refunding  bonds are issued and  the proceeds thereof are
deposited in irrevocable trust to retire the refunded Bonds on their  redemption
date.
 
    Except as stated in Section 4 regarding the limited right of substitution of
Replacement Bonds for Failed Bonds, and except for refunding securities that may
be  exchanged for Bonds under certain conditions specified in the Indenture, the
Indenture does not permit
 
                                      A-34
<PAGE>
either the Sponsor or the Trustee to acquire or deposit bonds either in addition
to, or in substitution for, any of the Bonds initially deposited in a Trust.
 
22.  INFORMATION ABOUT THE TRUSTEE
 
The Trustee is United States Trust Company of New York, with its principal place
of business at 114 West 47th Street, New York, New York 10036 and its  corporate
trust  office at  770 Broadway,  New York, New  York 10003.  United States Trust
Company of New York, established in  1853, has, since its organization,  engaged
primarily  in the  management of trust  and agency accounts  for individuals and
corporations. The Trustee is a member of the New York Clearing House Association
and is subject to supervision and examination 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. In connection with the storage  and
handling  of certain  Bonds deposited  in the  Trusts, the  Trustee may  use the
services  of  The  Depository  Trust  Company.  These  services  would   include
safekeeping  of the Bonds and  coupon-clipping, computer book-entry transfer and
institutional delivery  services.  The Depository  Trust  Company is  a  limited
purpose  trust company organized under the Banking Law of the State of New York,
a member of the  Federal Reserve System and  a clearing agency registered  under
the Securities Exchange Act of 1934.
 
LIMITATIONS ON LIABILITIES OF SPONSOR AND TRUSTEE
 
    The  Sponsor and the Trustee shall be  under no liability to Unitholders for
taking any action or for  refraining from any action  in good faith pursuant  to
the Indenture, or for errors in judgment, but shall be liable only for their own
negligence,  lack of good faith or willful  misconduct. The Trustee shall not be
liable for depreciation or loss incurred by reason of the sale by the Trustee of
any of the Bonds. In the  event of the failure of  the Sponsor to act under  the
Indenture, the Trustee may act thereunder and shall not be liable for any action
taken by it in good faith under the Indenture.
 
    The  Trustee shall not be liable for any taxes or other governmental charges
imposed upon or in respect of the Bonds or upon the interest thereon or upon  it
as  Trustee under  the Indenture or  upon or in  respect of any  Trust which the
Trustee may be required  to pay under  any present or future  law of the  United
States  of  America or  of any  other taxing  authority having  jurisdiction. In
addition,  the  Indenture  contains  other  customary  provisions  limiting  the
liability of the Trustee.
 
SUCCESSOR TRUSTEES AND SPONSORS
 
    The  Trustee or any successor trustee  may resign by executing an instrument
of resignation in writing and filing same with the Sponsor and mailing a copy of
a notice of resignation to all  Unitholders then of record. Upon receiving  such
notice,  the Sponsor is required to promptly appoint a successor trustee. If the
Trustee becomes incapable of acting or is adjudged a bankrupt or insolvent, or a
receiver or other public officer shall  take charge of its property or  affairs,
the  Sponsor  may  remove  the  Trustee  and  appoint  a  successor  by  written
instrument. The resignation  or removal of  a trustee and  the appointment of  a
successor trustee shall become effective only when the successor trustee accepts
its appointment as such. Any successor trustee shall be a corporation authorized
to  exercise  corporate  trust  powers, having  capital,  surplus  and undivided
profits of not less than $5,000,000. Any corporation into which a trustee may be
merged or with which it may  be consolidated, or any corporation resulting  from
any  merger or consolidation to  which a trustee shall be  a party, shall be the
successor trustee.
 
    If upon resignation  of a trustee  no successor has  been appointed and  has
accepted the appointment within 30 days after notification, the retiring trustee
may  apply  to  a court  of  competent  jurisdiction for  the  appointment  of a
successor.
 
                                      A-35
<PAGE>
    If the Sponsor fails to undertake any of its duties under the Indenture, and
no express  provision is  made for  action by  the Trustee  in such  event,  the
Trustee  may, in addition to its other  powers under the Indenture (1) appoint a
successor sponsor or (2) terminate the Indenture and liquidate the Trusts.
 
23.  INFORMATION ABOUT THE SPONSOR
 
John Nuveen & Co. Incorporated, the Sponsor and Underwriter, was founded in 1898
and is  the oldest  and  largest investment  banking  firm specializing  in  the
underwriting and distribution of tax-exempt securities and maintains the largest
research  department in the investment  banking community devoted exclusively to
the analysis of municipal securities. In  1961 the Sponsor began sponsoring  the
Nuveen  Tax-Exempt Unit Trust and, since this  time, it has issued more than $30
billion in tax-exempt unit trusts, including over $8 billion in insured  trusts.
The  Sponsor is  also principal underwriter  of the Nuveen  Municipal Bond Fund,
Inc., the Nuveen Tax-Exempt Money  Market Fund, Inc., Nuveen Tax-Free  Reserves,
Inc.,  Nuveen California Tax-Free  Fund, Inc., Nuveen  Tax-Free Bond Fund, Inc.,
Nuveen Insured Tax-Free Bond Fund, Inc.  and Nuveen Tax-Free Money Market  Fund,
Inc.,  all  registered open-end  management investment  companies, and  acted as
co-managing underwriter of Nuveen Municipal Value Fund, Inc., Nuveen  California
Municipal  Value Fund, Inc., Nuveen New  York Municipal Value Fund, Inc., Nuveen
Municipal Income  Fund, Inc.,  Nuveen California  Municipal Income  Fund,  Inc.,
Nuveen  New York  Municipal Income Fund,  Inc., Nuveen  Premium Income Municipal
Fund, Inc.,  Nuveen Performance  Plus Municipal  Fund, Inc.,  Nuveen  California
Performance  Plus  Municipal  Fund,  Inc.,  Nuveen  New  York  Performance  Plus
Municipal Fund, Inc.,  Nuveen Municipal Advantage  Fund, Inc., Nuveen  Municipal
Market  Opportunity Fund,  Inc., Nuveen California  Municipal Market Opportunity
Fund, Inc.,  Nuveen New  York Municipal  Market Opportunity  Fund, Inc.,  Nuveen
Investment  Quality Municipal  Fund, Inc., Nuveen  California Investment Quality
Municipal Fund, Inc., Nuveen New  York Investment Quality Municipal Fund,  Inc.,
Nuveen  Insured Quality Municipal Fund,  Inc., Nuveen Florida Investment Quality
Municipal Fund, Nuveen  Pennsylvania Investment Quality  Municipal Fund,  Nuveen
New  Jersey  Investment  Quality Municipal  Fund,  Inc., and  the  Nuveen Select
Quality Municipal Fund,  Inc., Nuveen California  Quality Municipal Fund,  Inc.,
Nuveen  New  York Select  Quality Municipal  Fund,  Inc., Nuveen  Quality Income
Municipal Fund, Inc.,  Nuveen Insured Municipal  Opportunity Fund, Inc.,  Nuveen
Florida  Quality Income Municipal Fund, Nuveen Michigan Quality Income Municipal
Fund, Inc., Nuveen New Jersey Quality  Income Municipal Fund, Inc., Nuveen  Ohio
Quality   Income  Municipal  Fund,  Inc.,  Nuveen  Pennsylvania  Quality  Income
Municipal Fund, Nuveen  Texas Quality Income  Municipal Fund, Nuveen  California
Quality  Income Municipal Fund,  Inc., Nuveen New  York Quality Income Municipal
Fund, Inc., Nuveen Premier  Insured Municipal Income  Fund, Inc., Nuveen  Select
Tax  Free Income  Portfolio, Nuveen Select  Tax Free Income  Portfolio 2, Nuveen
Insured California Select  Tax-Free Income  Portfolio, Nuveen  Insured New  York
Select  Tax-Free Income Portfolio, Nuveen Premium Income Municipal Fund 2, Inc.,
Nuveen Select Tax Free  Income Portfolio 3,  Nuveen Select Maturities  Municipal
Fund,  Nuveen  Insured California  Premium Income  Municipal Fund,  Inc., Nuveen
Arizona Premium  Income  Municipal Fund,  Inc.,  Nuveen Insured  Premium  Income
Municipal  Fund,  Inc., Nuveen  Insured Florida  Premium Income  Municipal Fund,
Nuveen Michigan Premium Income Municipal  Fund, Inc., Nuveen New Jersey  Premium
Income  Municipal Fund, Inc.,  Nuveen Insured New  York Premium Income Municipal
Fund, Inc., Nuveen Ohio Premium Income Municipal Fund, Inc., Nuveen Pennsylvania
Premium Income  Municipal  Fund, Nuveen  Texas  Premium Income  Municipal  Fund,
Nuveen Premium Income Municipal Fund 4, Inc., Nuveen Pennsylvania Premium Income
Municipal Fund 2, Nuveen Insured Florida Premium Income Municipal Fund 2, Nuveen
Maryland Premium Income Municipal Fund, Nuveen Virginia Premium Income Municipal
Fund,  Nuveen  Massachusetts  Premium  Income  Municipal  Fund,  Nuveen  Insured
California Premium  Income  Municipal Fund  2,  Inc., Nuveen  Insured  New  York
 
                                      A-36
<PAGE>
Premium Income Municipal Fund 2, Nuveen New Jersey Premium Income Municipal Fund
2,  Nuveen  Washington Premium  Income Municipal  Fund, Nuveen  Michigan Premium
Income Municipal Fund 2,  Nuveen Georgia Premium  Income Municipal Fund,  Nuveen
Missouri  Premium  Income  Municipal  Fund,  Nuveen  Connecticut  Premium Income
Municipal Fund, Nuveen North Carolina Premium Income Municipal Fund, Nuveen  New
Jersey  Premium Income Municipal Fund 3, Nuveen Florida Premium Income Municipal
Fund, Nuveen New York Premium  Income Municipal Fund, Nuveen California  Premium
Income  Municipal  Fund, Nuveen  Pennsylvania Premium  Income Municipal  Fund 3,
Nuveen  Maryland  Income  Municipal  Fund  2,  Nuveen  Virginia  Premium  Income
Municipal  Fund 2, Nuveen  Ohio Premium Income Municipal  Fund 2, Nuveen Insured
Premium Income Municipal Fund 2, Nuveen California Premium Income Municipal Fund
2, all registered closed-end  management investment companies. These  registered
open-end  and closed-end investment companies currently have approximately $32.8
billion  in  tax-exempt  securities  under  management.  Nationwide,  more  than
1,000,000  individual investors  have purchased  Nuveen's tax  exempt trusts and
funds.  The  present  corporation  was  organized  in  1967  as  a  wholly-owned
subsidiary  of Nuveen Corporation,  successor to the original  John Nuveen & Co.
founded in 1898 as a sole proprietorship and incorporated in 1953. In 1974, John
Nuveen &  Co. Incorporated  became a  wholly-owned subsidiary  of The  St.  Paul
Companies,  Inc., a financial  services management company  located in St. Paul,
Minnesota. On May 19, 1992, common shares comprising a minority interest in  The
John  Nuveen Company ("JNC"),  a newly organized corporation  which holds all of
the shares of  Nuveen, were  sold to  the general  public in  an initial  public
offering.  St. Paul retains a controlling interest in JNC with over 70% of JNC's
shares. The  Sponsor is  a  member of  the  National Association  of  Securities
Dealers,  Inc. and  the Securities  Industry Association  and has  its principal
offices located in Chicago (333 W. Wacker Drive) and New York (Swiss Bank Tower,
10 East 50th Street). It maintains 14 regional offices.
 
    To help advisers and investors better understand and more efficiently use an
investment in the Trust  to reach their investment  goals, the Trust's  sponsor,
John  Nuveen &  Co. Incorporated, may  advertise and  create specific investment
programs and  systems.  For  example, such  activities  may  include  presenting
information  on how to use  an investment in the  Trust, alone or in combination
with an investment in other mutual funds or unit investment trusts sponsored  by
Nuveen,  to accumulate  assets for future  education needs  or periodic payments
such as  insurance  premiums.  The  Trust's  sponsor  may  produce  software  or
additional sales literature to promote the advantages of using the Trust to meet
these and other specific investor needs.
 
24.  OTHER INFORMATION
AMENDMENT OF INDENTURE
 
    The  Indenture may  be amended  by the Trustee  and the  Sponsor without the
consent of any of  the Unitholders (1)  to cure any ambiguity  or to correct  or
supplement  any provision thereof which may be defective or inconsistent, or (2)
to make such  other provisions as  shall not adversely  affect the  Unitholders,
provided,  however, that the Indenture may not be amended to increase the number
of Units in any Trust or to permit the deposit or acquisition of bonds either in
addition to, or in substitution for any of the Bonds initially deposited in  any
Trust  except as stated in Section 4 regarding the limited right of substitution
of Replacement Bonds and  except for the substitution  of refunding bonds  under
certain circumstances. The Trustee shall advise the Unitholders of any amendment
promptly after execution thereof.
 
                                      A-37
<PAGE>
TERMINATION OF INDENTURE
 
    Each  Trust may be liquidated at any time  by written consent of 100% of the
Unitholders or by  the Trustee when  the value of  such Trust, as  shown by  any
evaluation,  is less than 20% of the original principal amount of such Trust and
will be  liquidated  by  the Trustee  in  the  event that  Units  not  yet  sold
aggregating  more  than 60%  of the  Units originally  created are  tendered for
redemption by the Sponsor thereby reducing the  net worth of such Trust to  less
than  40%  of the  principal amount  of  the Bonds  originally deposited  in the
portfolio. (See "Essential Information Regarding the Trusts.") The sale of Bonds
from the Trusts upon  termination may result in  realization of a lesser  amount
than  might otherwise be realized  if such sale were  not required at such time.
For this  reason,  among  others,  the amount  realized  by  a  Unitholder  upon
termination   may  be  less  than  the  principal  amount  of  Bonds  originally
represented by the Units held by  such Unitholder. The Indenture will  terminate
upon the redemption, sale or other disposition of the last Bond held thereunder,
but  in no event shall it continue beyond the end of the calendar year preceding
the fiftieth anniversary of its execution for National and State Trusts,  beyond
the  end  of  the  calendar  year preceding  the  twentieth  anniversary  of its
execution for Long Intermediate,  and Intermediate Trusts or  beyond the end  of
the  calendar year  preceding the tenth  anniversary of its  execution for Short
Intermediate and Short Term Trusts.
 
    Written notice of  any termination  specifying the  time or  times at  which
Unitholders  may surrender their Certificates, if any, for cancellation shall be
given by  the  Trustee  to each  Unitholder  at  the address  appearing  on  the
registration  books of the Trust maintained  by the Trustee. Within a reasonable
time thereafter the Trustee shall liquidate any Bonds in the Trust then held and
shall deduct  from  the assets  of  the Trust  any  accrued costs,  expenses  or
indemnities  provided  by  the  Indenture which  are  allocable  to  such Trust,
including estimated compensation of the Trustee and costs of liquidation and any
amounts required as a reserve to provide for payment of any applicable taxes  or
other  governmental charges. The Trustee shall then distribute to Unitholders of
such Trust their pro  rata share of  the balance of  the Interest and  Principal
Accounts.  With such  distribution the  Unitholders shall  be furnished  a final
distribution  statement,  in   substantially  the  same   form  as  the   annual
distribution statement, of the amount distributable. At such time as the Trustee
in  its sole discretion shall determine that  any amounts held in reserve are no
longer necessary, it shall make distribution thereof to Unitholders in the  same
manner.
 
LEGAL OPINION
 
    The legality of the Units offered hereby has been passed upon by Chapman and
Cutler, 111 West Monroe Street, Chicago, Illinois 60603. Special counsel for the
Trusts for respective state tax matters are named in "Tax Status" for each Trust
under  Section 3. Carter, Ledyard  & Milburn, 2 Wall  Street, New York, New York
10005, has acted as counsel for the Trustee with respect to the Series, and,  in
the absence of a New York Trust from the Series, as special New York tax counsel
for the Series.
 
AUDITORS
 
    The  Statements of Condition and Schedules of Investments at Date of Deposit
included  in  this  Prospectus  have  been  audited  by  Arthur  Andersen   LLP,
independent public accountants, as indicated in their report in this Prospectus,
and  are included herein in reliance upon  the authority of said firm as experts
in giving said report.
 
                                      A-38
<PAGE>
                            DESCRIPTION OF RATINGS*
 
    STANDARD & POOR'S CORPORATION.  A  description of the applicable Standard  &
Poor's Corporation rating symbols and their meanings follows:
 
    A  Standard & Poor's rating is  a current assessment of the creditworthiness
of an obligor with  respect to a specific  debt obligation. This assessment  may
take into consideration obligors such as guarantors, insurers or lessees.
 
    The  rating is not  a recommendation to  purchase, sell or  hold a security,
inasmuch as  it  does not  comment  as to  market  price or  suitability  for  a
particular investor.
 
    The  ratings are  based on  current information  furnished by  the issuer or
obtained by Standard & Poor's from other sources it considers reliable. Standard
& Poor's does not  perform an audit  in connection with any  rating and may,  on
occasion,  rely on unaudited financial information.  The ratings may be changed,
suspended or withdrawn  as a result  of changes in,  or unavailability of,  such
information, or for other circumstances.
 
    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 arrangements 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. Capacity to pay interest and repay principal is extremely strong.
 
    AA--Bonds  rated AA have  a very strong  capacity to pay  interest and repay
principal, and differ from the highest rated issues only in small degree.
 
    A--Bonds rated A have a strong capacity to pay interest and repay principal,
although they are somewhat more susceptible to the adverse effects of changes in
circumstances and economic conditions than bonds in higher rated categories.
 
    BBB--Bonds rated BBB  are regarded  as having  an adequate  capacity to  pay
interest  and repay principal. Whereas they normally exhibit adequate protection
parameters, adverse  economic  conditions  or changing  circumstances  are  more
likely  to lead to a  weakened capacity to pay  interest and repay principal for
bonds in this category than for bonds in the higher rated categories.
 
    PLUS (+) OR MINUS (-): 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:  The   letter  "p"  indicates   that  the  rating   is
provisional.  A  provisional rating  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  of the  project, 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.
 
- ----------
*As published by the rating companies.
 
                                      A-39
<PAGE>
    NOTE  RATINGS:  A  Standard  & Poor's  note  rating  reflects  the liquidity
concerns and market access risks unique to  notes. Notes due in 3 years or  less
will  likely receive  a note  rating. Notes  maturing beyond  3 years  will most
likely receive a long-term debt rating.
 
    Note rating symbols are as follows:
 
        SP-1  Very strong  or strong  capacity to  pay principal  and  interest.
              Those   issues   determined   to   possess   overwhelming   safety
              characteristics will be given a plus (+) designation.
 
        SP-2  Satisfactory capacity to pay principal and interest.
 
RATINGS OF INSURED TRUST UNITS.
 
    A Standard  &  Poor's  Corporation's  rating on  the  units  of  an  insured
investment  trust (hereinafter referred to collectively as "units" and "trusts")
is a current assessment of creditworthiness with respect to the investment  held
by  such trust. This assessment takes  into consideration the financial capacity
of the  issuers and  of any  guarantors, insurers,  lessees or  mortgagors  with
respect to such investments. The assessment, however, does not take into account
the  extent to which trust  expenses or portfolio asset  sales for less than the
trust purchase price will reduce payment  to the unitholder 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.
 
    Units rated "AAA" are composed exclusively of assets that are rated "AAA" by
Standard  &  Poor's and/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.  However, unit ratings may  be subject to revision  or
withdrawal  at any time by Standard & Poor's and each rating should be evaluated
independently of any other rating.
 
    MOODY'S INVESTORS  SERVICE, INC.    A brief  description of  the  applicable
Moody's Investors Service, Inc. rating symbols and their meanings follows:
 
    Aaa--Bonds which are rated Aaa are judged to be the best quality. They carry
the  smallest degree of investment  risk and are generally  referred to as "gilt
edge." Interest payments are protected by a large or by an exceptionally  stable
margin and principal is secure. While the various protective elements are likely
to  change, such changes  as can be  visualized are most  unlikely to impair the
fundamentally strong position of such issues. Their safety is so absolute  that,
with  the  occasional  exception  of oversupply  in  a  few  specific instances,
characteristically, their  market  value  is affected  solely  by  money  market
fluctuations.
 
    Aa--Bonds  which  are rated  Aa  are judged  to be  of  high quality  by all
standards. Together with the Aaa group they comprise what are generally known as
high grade bonds. They are  rated lower than the  best bonds because margins  of
protection  may  not  be  as  large as  in  Aaa  securities  or  fluctuations of
protective elements may be of greater  amplitude or there may be other  elements
present  which  make the  long-term  risks appear  somewhat  larger than  in Aaa
securities. Their  market value  is virtually  immune to  all but  money  market
influences,  with  the  occasional exception  of  oversupply in  a  few specific
instances.
 
    A--Bonds which are rated A possess many favorable investment attributes  and
are  to be considered as upper medium grade obligations. Factors giving security
to principal and interest are considered  adequate, but elements may be  present
which  suggest a susceptibility to impairment sometime in the future. The market
value of A-rated bonds may be influenced to some degree by economic  performance
during  a sustained period of depressed business conditions, but, during periods
of normalcy, A-rated bonds frequently move in
 
                                      A-40
<PAGE>
parallel  with  Aaa  and  Aa  obligations,  with  the  occasional  exception  of
oversupply in a few specific instances.
 
    Moody's  bond rating  symbols may contain  numerical modifiers  of a generic
rating classification. The modifier 1 indicates that the bond ranks at the  high
end  of its  category; the  modifier 2  indicates a  mid-range ranking;  and the
modifier 3 indicates that the issue ranks in the lower end of its generic rating
category.
 
    Baa--Bonds which are rated Baa  are considered as medium grade  obligations,
i.e.,  they are neither  highly protected nor  poorly secured. Interest payments
and principal security appear  adequate for the  present but certain  protective
elements  may be lacking or may  be characteristically unreliable over any great
length of time. Such  bonds lack outstanding  investment characteristics and  in
fact  have speculative  characteristics as well.  The market  value of Baa-rated
bonds is more  sensitive to changes  in economic circumstances,  and aside  from
occasional  speculative factors applying to some bonds of this class, Baa market
valuations move in  parallel with Aaa,  Aa and A  obligations during periods  of
economic normalcy, except in instances of oversupply.
 
    Con.  (--)--Bonds for which the security depends upon the completion of some
act or the  fulfillment of  some condition  are rated  conditionally. These  are
bonds  secured by (a)  earnings of projects under  construction, (b) earnings of
projects unseasoned  in  operation  experience, (c)  rentals  which  begin  when
facilities are completed, or (d) payments to which some other limiting condition
attaches.  Parenthetical rating denotes probable  credit stature upon completion
of construction or elimination of basis of condition.
 
    NOTE RATINGS:
 
    MIG 1-- This  designation  denotes best  quality.  There is  present  strong
           protection  by established cash flows,  superior liquidity support or
           demonstrated broad-based access to the market for refinancing.
 
    MIG 2-- This designation  denotes high  quality. Margins  of protection  are
           ample although not so large as in the preceding group.
 
                                      A-41
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                                      A-42
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                                      A-43
<PAGE>
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                                      A-44
<PAGE>
 
<TABLE>
<C>                <S>        <C>
           NUVEEN             Tax-Exempt Unit Trusts
 
                           PROSPECTUS
                           175,000 Units
                           Maryland Traditional Trust
                           304
                           National Insured Trust 291
                           California Insured Trust 243
</TABLE>
 
<PAGE>
 
<TABLE>
<C>                 <S>        <C>
            NUVEEN             Tax-Exempt Unit Trusts
 
           SPONSOR             John Nuveen & Co. Incorporated
                               333 West Wacker Drive
                               Chicago, IL 60606-1286
                               Telephone: 312.917.7700
 
                               Swiss Bank Tower
                               10 East 50th Street
                               New York, NY 10022
                               212.207.2000
 
           TRUSTEE             United States Trust Company
                               of New York
                               770 Broadway
                               New York, NY 10003
                               800.257.8787
 
     LEGAL COUNSEL             Chapman and Cutler
        TO SPONSOR             111 West Monroe Street
                               Chicago, IL 60603
 
       INDEPENDENT             Arthur Andersen LLP
            PUBLIC             33 West Monroe Street
       ACCOUNTANTS             Chicago, IL 60603
    FOR THE TRUSTS
</TABLE>
 
   Except as to statements made herein furnished by the Trustee, the Trustee has
   assumed  no responsibility for the accuracy, adequacy and completeness of the
   information contained in this Prospectus.
                   This Prospectus does not contain  all of the information  set
   forth in the registration statement and exhibits relating thereto, filed with
   the   Securities  and  Exchange  Commission,   Washington,  D.C.,  under  the
   Securities Act of 1933, and to which reference is made.
                   No person is authorized  to give any  information or to  make
   representations  not contained in  this Prospectus or  in supplementary sales
   literature prepared by the Sponsor, and any information or representation not
   contained therein must not be relied upon as having been authorized by either
   the Trusts, the Trustee or the  Sponsor. 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.  The  Trusts  are registered  as  a  Unit Investment  Trust  under the
   Investment Company Act  of 1940. Such  registration does not  imply that  the
   Trusts  or any of their Units  has been guaranteed, sponsored, recommended or
   approved by the United States or any State or agency or officer thereof.
 
   
   786
    
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the Maryland
Traditional Trust 304 which is incorporated in the Prospectus dated February 23,
1995 and is qualified in its entirety by reference to such prospectus.
</LEGEND>
 
       
<S>                                                <C>
<PERIOD-TYPE>                                      OTHER
<FISCAL-YEAR-END>                                               Jan-31-1996
<PERIOD-END>                                                    Jan-31-1996
<INVESTMENTS-AT-COST>                                             3,288,145
<INVESTMENTS-AT-VALUE>                                            3,304,615
<RECEIVABLES>                                                        37,486
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    3,342,101
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            37,486
<TOTAL-LIABILITIES>                                                  37,486
<SENIOR-EQUITY>                                                           0
<PAID-IN-CAPITAL-COMMON>                                                  0
<SHARES-COMMON-STOCK>                                                35,000
<SHARES-COMMON-PRIOR>                                                     0
<ACCUMULATED-NII-CURRENT>                                                 0
<OVERDISTRIBUTION-NII>                                                    0
<ACCUMULATED-NET-GAINS>                                                   0
<OVERDISTRIBUTION-GAINS>                                                  0
<ACCUM-APPREC-OR-DEPREC>                                                  0
<NET-ASSETS>                                                      3,304,615
<DIVIDEND-INCOME>                                                         0
<INTEREST-INCOME>                                                         0
<OTHER-INCOME>                                                            0
<EXPENSES-NET>                                                            0
<NET-INVESTMENT-INCOME>                                                   0
<REALIZED-GAINS-CURRENT>                                                  0
<APPREC-INCREASE-CURRENT>                                                 0
<NET-CHANGE-FROM-OPS>                                                     0
<EQUALIZATION>                                                            0
<DISTRIBUTIONS-OF-INCOME>                                                 0
<DISTRIBUTIONS-OF-GAINS>                                                  0
<DISTRIBUTIONS-OTHER>                                                     0
<NUMBER-OF-SHARES-SOLD>                                                   0
<NUMBER-OF-SHARES-REDEEMED>                                               0
<SHARES-REINVESTED>                                                       0
<NET-CHANGE-IN-ASSETS>                                                    0
<ACCUMULATED-NII-PRIOR>                                                   0
<ACCUMULATED-GAINS-PRIOR>                                                 0
<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>                                                 94.42
<PER-SHARE-NII>                                                           0
<PER-SHARE-GAIN-APPREC>                                                   0
<PER-SHARE-DIVIDEND>                                                      0
<PER-SHARE-DISTRIBUTIONS>                                                 0
<RETURNS-OF-CAPITAL>                                                      0
<PER-SHARE-NAV-END>                                                       0
<EXPENSE-RATIO>                                                           0
<AVG-DEBT-OUTSTANDING>                                                    0
<AVG-DEBT-PER-SHARE>                                                      0
        

</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the National
Insured  Trust 291  which is incorporated  in the Prospectus  dated February 23,
1995 and is qualified in its entirety by reference to such prospectus.
</LEGEND>
 
       
<S>                                                <C>
<PERIOD-TYPE>                                      OTHER
<FISCAL-YEAR-END>                                               Jan-31-1996
<PERIOD-END>                                                    Jan-31-1996
<INVESTMENTS-AT-COST>                                             9,619,766
<INVESTMENTS-AT-VALUE>                                            9,680,204
<RECEIVABLES>                                                       131,586
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    9,811,790
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                           131,586
<TOTAL-LIABILITIES>                                                 131,586
<SENIOR-EQUITY>                                                           0
<PAID-IN-CAPITAL-COMMON>                                                  0
<SHARES-COMMON-STOCK>                                               100,000
<SHARES-COMMON-PRIOR>                                                     0
<ACCUMULATED-NII-CURRENT>                                                 0
<OVERDISTRIBUTION-NII>                                                    0
<ACCUMULATED-NET-GAINS>                                                   0
<OVERDISTRIBUTION-GAINS>                                                  0
<ACCUM-APPREC-OR-DEPREC>                                                  0
<NET-ASSETS>                                                      9,680,204
<DIVIDEND-INCOME>                                                         0
<INTEREST-INCOME>                                                         0
<OTHER-INCOME>                                                            0
<EXPENSES-NET>                                                            0
<NET-INVESTMENT-INCOME>                                                   0
<REALIZED-GAINS-CURRENT>                                                  0
<APPREC-INCREASE-CURRENT>                                                 0
<NET-CHANGE-FROM-OPS>                                                     0
<EQUALIZATION>                                                            0
<DISTRIBUTIONS-OF-INCOME>                                                 0
<DISTRIBUTIONS-OF-GAINS>                                                  0
<DISTRIBUTIONS-OTHER>                                                     0
<NUMBER-OF-SHARES-SOLD>                                                   0
<NUMBER-OF-SHARES-REDEEMED>                                               0
<SHARES-REINVESTED>                                                       0
<NET-CHANGE-IN-ASSETS>                                                    0
<ACCUMULATED-NII-PRIOR>                                                   0
<ACCUMULATED-GAINS-PRIOR>                                                 0
<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>                                                 96.80
<PER-SHARE-NII>                                                           0
<PER-SHARE-GAIN-APPREC>                                                   0
<PER-SHARE-DIVIDEND>                                                      0
<PER-SHARE-DISTRIBUTIONS>                                                 0
<RETURNS-OF-CAPITAL>                                                      0
<PER-SHARE-NAV-END>                                                       0
<EXPENSE-RATIO>                                                           0
<AVG-DEBT-OUTSTANDING>                                                    0
<AVG-DEBT-PER-SHARE>                                                      0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<LEGEND>
This   schedule  contains  summary  financial  information  extracted  from  the
California Insured  Trust 243  which  is incorporated  in the  Prospectus  dated
February  23,  1995  and is  qualified  in  its entirety  by  reference  to such
prospectus.
</LEGEND>
 
       
<S>                                                <C>
<PERIOD-TYPE>                                      OTHER
<FISCAL-YEAR-END>                                               Jan-31-1996
<PERIOD-END>                                                    Jan-31-1996
<INVESTMENTS-AT-COST>                                             3,795,810
<INVESTMENTS-AT-VALUE>                                            3,823,825
<RECEIVABLES>                                                        59,333
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    3,883,158
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            59,333
<TOTAL-LIABILITIES>                                                  59,333
<SENIOR-EQUITY>                                                           0
<PAID-IN-CAPITAL-COMMON>                                                  0
<SHARES-COMMON-STOCK>                                                40,000
<SHARES-COMMON-PRIOR>                                                     0
<ACCUMULATED-NII-CURRENT>                                                 0
<OVERDISTRIBUTION-NII>                                                    0
<ACCUMULATED-NET-GAINS>                                                   0
<OVERDISTRIBUTION-GAINS>                                                  0
<ACCUM-APPREC-OR-DEPREC>                                                  0
<NET-ASSETS>                                                      3,823,825
<DIVIDEND-INCOME>                                                         0
<INTEREST-INCOME>                                                         0
<OTHER-INCOME>                                                            0
<EXPENSES-NET>                                                            0
<NET-INVESTMENT-INCOME>                                                   0
<REALIZED-GAINS-CURRENT>                                                  0
<APPREC-INCREASE-CURRENT>                                                 0
<NET-CHANGE-FROM-OPS>                                                     0
<EQUALIZATION>                                                            0
<DISTRIBUTIONS-OF-INCOME>                                                 0
<DISTRIBUTIONS-OF-GAINS>                                                  0
<DISTRIBUTIONS-OTHER>                                                     0
<NUMBER-OF-SHARES-SOLD>                                                   0
<NUMBER-OF-SHARES-REDEEMED>                                               0
<SHARES-REINVESTED>                                                       0
<NET-CHANGE-IN-ASSETS>                                                    0
<ACCUMULATED-NII-PRIOR>                                                   0
<ACCUMULATED-GAINS-PRIOR>                                                 0
<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>                                                 95.60
<PER-SHARE-NII>                                                           0
<PER-SHARE-GAIN-APPREC>                                                   0
<PER-SHARE-DIVIDEND>                                                      0
<PER-SHARE-DISTRIBUTIONS>                                                 0
<RETURNS-OF-CAPITAL>                                                      0
<PER-SHARE-NAV-END>                                                       0
<EXPENSE-RATIO>                                                           0
<AVG-DEBT-OUTSTANDING>                                                    0
<AVG-DEBT-PER-SHARE>                                                      0
        

</TABLE>
 
<PAGE>

Statement of differences between electronic filing and printed document.
   Pursuant to Rule 499(c) (7) under the Securities Act of 1933 and Rule
20-11 under the Investment Company Act of 1940, Registrant hereby identifies
those differences in the foregoing document between the electronic format in
which it is filed and the printed form in which it will be circulated:
   (1) The printed and distributed prospectus may be paged differently
because the printed document may contain a different amount of information on
each page from that contained in the electronic transmission.
   (2) On the cover page, in the index and on the last page of the printed
document, solid vertical bars will appear.
   (3) In the printed document, footnote symbols may include a "dagger" or
multiple "dagger".  The "dagger" symbol is represented as # in the electronic
document.
   (4) The printed and distributed prospectus will not  contain the
preliminary prospectus legend included at the beginning of the first
prospectus page.


<PAGE>

                       CONTENTS OF REGISTRATION STATEMENT

A.  BONDING ARRANGEMENTS OF DEPOSITOR:

    The Depositor has obtained  the following Stockbrokers Blanket Bonds
for its officers, directors and employees:

    INSURER/POLICY NO.                                     AMOUNT

    United Pacific Insurance Co.                           $10,000,000
    Reliance Insurance Company
    B 74 92 20

    Aetna Casualty and Surety                              $10,000,000
    08 F10618BCA

    St. Paul Insurance Co.                                 $ 6,000,000
    400 HC 1051

B.  This amendment of Registration Statement comprises the following papers 
and documents:

              The facing sheet
              The Prospectus

              The signatures

              Consents of Independent Public
              Accountants and Counsel as indicated

              Exhibits as listed on page S-5


<PAGE>

                                   SIGNATURES

    The Registrant, Nuveen Tax-Exempt Unit Trust, Series 786 hereby
identifies Series 401, 507, 512, 515, 517, 519 and 723 of the Nuveen 
Tax-Exempt Unit Trust for purposes of the representations required by 
Rule 487 and represents the following:

    (1) that the portfolio securities deposited in the series as to the
securities of which this Registration Statement is being filed do not differ
materially in type or quality from those deposited in such previous series;

    (2) that, except to the extent necessary to identify the specific
portfolio securities deposited in, and to provide essential financial
information for, the series with respect to the securities of which this
Registration Statement is being filed, this Registration Statement does not
contain disclosures that differ in any material respect from those contained
in the registration statements for such previous series as to which the
effective date was determined by the Commission or the staff; and

    (3) that it has complied with Rule 460 under the Securities Act of 1933.

    Pursuant to the requirements of the Securities Act of 1933, the
Registrant, Nuveen Tax-Exempt Unit Trust, Series 786 has duly caused this
Amendment of Registration Statement to be signed on its behalf by the
undersigned thereunto duly authorized in the City of Chicago and State of
Illinois on 2/23/95.

 
                                NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 786
                                (Registrant)

                                By JOHN NUVEEN & CO. INCORPORATED
                                (Depositor)


                       
                                By: Larry Woods Martin
                                    _________________________________
                                    Vice President


                        
                           Attest:  Morrison C. Warren
                                    __________________________________
                                    Assistant Secretary


<PAGE>

    Pursuant to the requirements of the Securities Act of 1933, this Amendment
of Registration Statement has been signed below by the following persons in 
the capacities and on the dates indicated:


    SIGNATURE                     TITLE*                       DATE

Richard J. Franke       Chairman, Board of Directors  )
                        Chief Executive Officer and   )
                        Director                      )
                                                      )
Donald E. Sveen         President, Chief Operating    )
                        Officer and Director          )
                                                      )
                                             
Anthony T. Dean         Executive Vice President      ) Larry Woods Martin
                        and Director                  ) Attorney-In-Fact**
                                                      )
Timothy T. Schwertfeger Executive Vice President      )
                        and Director                  )

O. Walter Renfftlen     Vice President and Controller )
                        (Principal Accounting Officer))
                                                      )
                                                      )2/23/95
___________________

*The titles of the persons named herein represent their capacity in and
relationship to John Nuveen & Co. Incorporated, the Depositor.

**The powers of attorney were filed on Form SE for Messrs. Franke, 
Sveen, Renfftlen, Dean and Schwertfeger with the Amendment to the 
Registration Statement on Form S-6 of Nuveen Tax-Exempt Unit Trust, 
Series 671 (File No. 33-49175). 



<PAGE>

786

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

    As independent public accountants, we hereby consent to the use of our
report and to all references to our Firm included in or made a part of this
Registration Statement.

                                 
                                            Arthur Andersen LLP
Chicago, Illinois
2/23/95


                         CONSENT OF CHAPMAN AND CUTLER

    The consent of Chapman and Cutler to the use of its name in the Prospectus
included in the Registration Statement is contained in its opinions filed by
this amendment as Exhibits 3.1 and 3.2 to the Registration Statement.

                            CONSENT OF STATE COUNSEL

    The consents of special counsel to the Fund for state tax matters to the 
use of their names in the Prospectus included in the Registration Statement 
are contained in their opinions filed by this amendment as Exhibit 3.3 to the
Registration Statement.

                   CONSENT OF STANDARD + POOR'S CORPORATION

    The consent of Standard + Poor's Corporation to the use of its name in
the Prospectus included in the Registration Statement is filed by this
amendment as Exhibit 4.1 to the Registration Statement.

                   CONSENT OF KENNY S+P EVALUATION SERVICES

    The consent of Kenny S+P Evaluation Services to the use of its name in the
Prospectus included in the Registration Statement is filed by this amendment 
as Exhibit 4.2 to the Registration Statement.

                      CONSENT OF CARTER, LEDYARD & MILBURN

    The consent of Carter, Ledyard & Milburn to the use of its name in the
Prospectus included in the Registration Statement is filed by this amendment 
as Exhibit 4.3 to the Registration Statement.

<PAGE>

                                LIST OF EXHIBITS


1.1 (a)  Copy of Trust Indenture and Agreement between John Nuveen &
         Co. Incorporated, Depositor, and United States Trust Company of
         New York, Trustee (as Exibit 1.1 (a) to the Sponsor's Registration
         Statement on Form S-6 relating to Series 723 of the Fund (file No.
         33-52527) and incorporated herein by reference).

1.1 (b)  Schedules to the Trust Indenture and Agreement.

2.1      Copy of Certificate of Ownership (Included in Exhibit 1.1(a) on
         pages 2 to 8, inclusive, and incorporated herein by reference).

3.1      Opinion of counsel as to legality of securities being registered.

3.2      Opinion of counsel as to Federal income tax status of securities
         being registered.

3.3      Opinions of special state counsel to the Fund for state tax matters
         as to income tax status to residents of the respective states of the
         units of the respective trusts and consents to the use of their names
         in the Prospectus.

4.1      Consent of Standard + Poor's Corporation.

4.2      Consent of Kenny S+P Evaluation Services.

4.3      Consent of Carter, Ledyard & Milburn.

                                                                      
<PAGE>                                                                        
                                                                              
Exhibit 1.1(b)                                                                
                                                                              
                                                                              
                                                                              
                                                                              
                                 SCHEDULE A                                   
                                                                              
                                                                              
Series 786                                           February 23, 1995        
                                                                              
Item 1.  This Indenture relates to the Nuveen Tax-Exempt Unit Trust           
         Series 786.                                                          
                                                                              
Item 2.  The date of this Indenture is February 23, 1995.                     
                                                                              
Item 3.  Series 786 shall initially contain Trusts as follows:                
                                                                              
         (a)   Maryland Traditional Trust 304                                 
         (b)   National Insured Trust 291                                     
         (c)   California Insured Trust 243                                   
                                                                              
                                                                              
Item 4.  Each Trust shall initially consist of the following number of Units: 
                                                                              
         (a)   Maryland Traditional Trust               35,000 Units          
         (b)   National Insured Trust                  100,000 Units          
         (c)   California Insured Trust                 40,000 Units          
                                                                              
                                                                              
Item 5.  (a) The amount of the second distribution from the Interest          
             Account of the respective Trusts will be as follows:             
                                                                              
         ( 1)  Maryland Traditional Trust              $ .5783 per Unit       
         ( 2)  National Insured Trust                  $ .6095 per Unit       
         ( 3)  California Insured Trust                $ .5931 per Unit       
                                                                              
         (b) The date of the second distribution from the Interest Account    
             of the respective Trusts will be as follows:                     
                                                                              
         ( 1)  Maryland Traditional Trust              April 15, 1995         
         ( 2)  National Insured Trust                  April 15, 1995         
         ( 3)  California Insured Trust                April 15, 1995         
                                                                              
         (c) The record date for the second distribution from the             
             Interest Account of the respective Trusts will be as             
             follows:                                                         
                                                                              
         ( 1)  Maryland Traditional Trust              April 1, 1995          
         ( 2)  National Insured Trust                  April 1, 1995          
         ( 3)  California Insured Trust                April 1, 1995          
                                                                              
                                                                              
         PAGE 2                                                               
                                                                              
                                                                              
Item 6.  Record dates for subsequent semi-annual distributions from the       
         Interest Account for each of the respective Trusts will be the 1st   
         day of May and November of each year.                                
                                                                              
                                                                              
Item 7.  (a) Record date for distibution from the Principal Account of each   
             of the respective Trusts will be the first day of May and        
             November of each year.                                           
                                                                              
         (b) The first record date for distributions from the Principal       
             Account of each of the respective Trusts will be                 
             May 1, 1995.                                                     
                                                                              
                                                                              
Item 8.  The Trust shall in no event continue beyond the end of the calendar  
         year preceding the fiftieth anniversary of the execution of this     
         Indenture for National and State Trusts, beyond the end of the       
         calendar year preceding the twentieth anniversary of its execution   
         for Long Intermediate and Intermediate Trusts and beyond the end of  
         the calendar year preceding the tenth anniversary of its execution   
         for Short Intermediate and Short Term Trusts.                        
                                                                              
                                                                              
Item 9.  Quarterly distributions from the Interest Account of the respective  
         Trusts will be computed as of the 1st day of February, May, August,  
         and November.                                                        
                                                                              
                                                                              
Item 10. Certain deductions from the Interest Account by the Trustee          
         will commence as follows:                                            
                                                                              
         (a)   Maryland Traditional Trust              April 1, 1995          
         (b)   National Insured Trust                  April 1, 1995          
         (c)   California Insured Trust                April 1, 1995          
                                                                              
Item 11. (a)  For services performed prior to the date indicated in           
              Item 5(c) of this Schedule A, the Trustee shall be paid at      
              the following annual rates per $1,000 of principal amount       
              of Bonds:                                                       
                                                                              
         ( 1)  Maryland Traditional Trust              $1.5523                
         ( 2)  National Insured Trust                  $1.6487                
         ( 3)  California Insured Trust                $1.7127                
                                                                              
         (b)  For services performed on or after the date indicated in        
              Item 5(c) of this Schedule A, the Trustee shall be paid at      
              the following annual rates per $1,000 of principal amount       
              of Bonds:                                                       
                                                                              
         ( 1)  Maryland Traditional Trust                                     
                                                                              
               Monthly Plan of Distribution                  $1.5523          
               Quarterly Plan of Distribution                $1.2323          
               Semi-Annual Plan of Distribution              $1.0423          
                                                                              
         ( 2)  National Insured Trust                                         
                                                                              
               Monthly Plan of Distribution                  $1.6487          
               Quarterly Plan of Distribution                $1.3287          
               Semi-Annual Plan of Distribution              $1.1387          
                                                                              
         ( 3)  California Insured Trust                                       
                                                                              
               Monthly Plan of Distribution                  $1.7127          
               Quarterly Plan of Distribution                $1.3927          
               Semi-Annual Plan of Distribution              $1.2027          
                                                                              
                                                                              
                                                                              
                            ADDITIONAL SCHEDULES                              
                                                                              
                                                                              
                         BONDS INITIALLY DEPOSITED                            
                                                                              
                  NUVEEN TAX-EXEMPT UNIT TRUST SERIES 786                     
                                                                              
                                                                              
                                                                              
                                                                              
Incorporated herein and made a part hereof as indicated below are the         
following annual rates per $1,000 of principal amount of Bonds:               
corresponding portions of the 'Schedules of Investments at Date of Deposit'   
contained in the Prospectus dated the Date of Deposit and relating to the     
above-named Series:                                                           
                                                                              
         Schedule B:  Maryland Traditional Trust 304                          
         Schedule C:  National Insured Trust 291                              
         Schedule D:  California Insured Trust 243                            


<PAGE>

EXHIBIT 3.1

(ON CHAPMAN AND CUTLER LETTERHEAD)

2/23/95


John Nuveen & Co. Incorporated
333 W. Wacker Drive
Chicago, Illinois  60606

RE:  Nuveen Tax-Exempt Unit Trust, Series 786

Gentlemen:

    We have served as counsel for you, as depositor of Nuveen Tax-Exempt Unit
Trust, Series 786 (hereinafter referred to as the "Fund"), in connection
with the issuance under the Trust Indenture and Agreement dated the date 
hereof between John Nuveen & Co. Incorporated, as Depositor, and United 
States Trust Company of New York, as Trustee, of Units of fractional 
undivided interest in the one or more Trusts of said Fund (hereinafter 
referred to as the "Units").
 
    In connection therewith, we have examined such pertinent records and
documents and matters of law as we have deemed necessary in order to enable us
to express the opinions hereinafter set forth.

    Based upon the foregoing, we are of the opinion that:

   1.   The execution and delivery of the Trust Indenture and Agreement and
the establishment of book entry positions and the execution and issuance of 
certificates evidencing the Units in the Trusts of the Fund have been duly 
authorized; and

    2.   The book entry positions and certificates positions evidencing the 
Units in the Trusts of the Fund when duly executed and delivered or duly 
established by the Depositor and the Trustee in accordance with the 
aforementioned Trust Indenture and Agreement, will constitute valid and 
binding obligations of such Trusts and the Depositor in accordance with the 
terms thereof.

    We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement (File No. 33-57383) relating to the Units referred
to above and to the use of our name and to the reference to our firm in said
Registration Statement and in the related Prospectus.

Respectfully submitted,



CHAPMAN AND CUTLER

<PAGE>

EXHIBIT 3.2

(ON CHAPMAN AND CUTLER LETTERHEAD)

2/23/95

John Nuveen & Co. Incorporated
333 W. Wacker Drive
Chicago, Illinois  60606

RE:  Nuveen Tax-Exempt Unit Trust, Series 786

Gentlemen:

    We have served as counsel for you, as Depositor of Nuveen Tax-Exempt Unit
Trust, Series 786 (the "Fund") in connection with the issuance under the
Trust Indenture and Agreement, dated the date hereof between John Nuveen & Co.
Incorporated, as Depositor, and United States Trust Company of New York, as
Trustee, of Units of fractional undivided interest (the "Units"), as evidenced
by a book entry position or certificate, if requested by the purchaser of 
Units, in the one or more Trusts of said Fund.

    We have also served as counsel for you in connection with all previous
Series of the Nuveen Tax-Exempt Unit Trust and as such have previously 
examined such pertinent records and documents and matters of law as we have 
deemed necessary, including (but not limited to) the Trust Indenture and 
Agreements with respect to those series.  We have also examined such 
pertinent records and documents and matters of law as we have deemed 
necessary including (but not limited to) the Trust Indenture and Agreement 
relating to Nuveen Tax-Exempt Unit Trust, Series 786.

    We have concluded that the Trust Indenture and Agreement for the Fund and
its counterpart in each of the prior issues of Nuveen Tax-Exempt Unit Trust 
are in all material respects substantially identical.

    Based upon the foregoing, and upon such matters of law as we consider
to be applicable we are of the opinion that, under existing federal income
law:

    (i)  For Federal income tax purposes, each of the Trusts will not be
taxable as an association but will be governed by the provisions of 
Subchapter J (relating to Trusts) of Chapter 1, Internal Revenue Code of 
1986 (the "Code").

    (ii) Each Unitholder will be considered as owning a pro rata
share of each asset of the respective Trust of the Fund in the proportion
that the number of Units of such Trust held by him bears to the total number
of outstanding Units of such Trust. Under Subpart E, Subchapter J of Chapter
1 of the Code, income of each Trust will be treated as income of each
Unitholder thereof in the proportion described and an item of Fund income
will have the same character in the hands of a Unitholder as it would have in
the hands of the Trustee.  Accordingly, to the extent that the income of a
Trust consists of interest and original issue discount excludable from gross
income under Section 103 of the Code, such income will be excludable from
federal gross income of the Unitholder, except in the case of a Unitholder
who is a substantial user (or a person related to such user) of a facility
financed through issuance of any industrial development bonds or certain
private activity bonds held by the Trust. In the case of such Unitholder who
is a substantial user (and no other) interest received and original issue
discount with respect to his Units attributable to such industrial
development bonds or such private activity bonds is includable in his gross
income. In the case of certain corporations, interest on the Bonds is included
in computing the alternative minimum tax pursuant to Sections 56(f) and 56(g)
of the Code, the enviromental tax (the "Superfund Tax") imposed by Sections
59A of the Code, and the branch profits tax imposed by Section 884 of the Code
with repect to U.S. branches of foreign corporations.

    (iii) Gain or loss will be recognized to a Unitholder upon
redemption or sale of his Units.  Such gain or loss is measured by comparing 
the proceeds of such redemption or sale with the adjusted basis of such Units.
Before adjustment, such basis would normally be cost if the Unitholder had
acquired his Units by purchase, plus his aliquot share of advances by the
Trustee to the Trust to pay interest on Bonds delivered after the Unitholder's
settlement date to the extent that such interest accrued on the Bonds during
the period from the Unitholder's settlement date to the date such Bonds are
delivered to the Trust, but only to the extent that such advances are to be
repaid to the Trustee out of interest received by the Fund with respect to
such Bonds.  In addition, such basis will be increased by both the
Unitholder's aliquot share of the accrued original issued discount with
respect to each Bond held by the Trust with respect to which there was an
original issue discount and reduced by the annual amortization of bond
premium, if any, on Bonds held by the Trust.

<PAGE>

    (iv) If the Trustee disposes of a Trust asset (whether by sale, payment on
maturity, redemption or otherwise), gain or loss is recognized to the
Unitholder and the amount thereof is measured by comparing the
Unitholder's aliquot share of the total proceeds from the transaction
with his basis for his fractional interest in the asset disposed of.  Such 
basis is ascertained by apportioning the tax basis for his Units among each 
of the Trust assets (as of the date on which his Units were acquired) ratably 
according to their values as of the valuation date nearest the date on which 
he purchased such Units.  A Unitholder's basis in his Units and of his
fractional interest in each Trust asset must be reduced by the amount of his 
aliquot share of interest received by the Fund, if any, on Bonds delivered
after the Unitholder's settlement date to the extent that such
interest accrued on the Bonds during the period from the Unitholder's
settlement date to the date such Bonds are delivered to the Trust, must be 
reduced by the annual amortization of bond premium, if any, on Bonds held by 
the Trust and must be increased by the Unitholder's share of accrued
original issue discount with respect to each Bond which, at the time
the Bond was issued, had original issue discount.

     (v)  In the case of any Bond held by the Trust where the "stated
redemption price at maturity" exceeds the "issue price," such excess shall
be original issue discount.  With respect to each Unitholder, upon the
purchase of his Units subsequent to the original issuance of Bonds held by the
Trust Section 1272(a)(7) of the Code provides for a reduction in the accrued
"daily portion" of such original issue discount upon the purchase of a Bond
subsequent to the Bond's original issue, under certain circumstances.  In the
case of any Bond held by the Trust the interest on which is excludable from
gross income under Section 103 of the Code, any original issue discount which
accrues with respect thereto will be treated as interest which is excludable
from gross income under Section 103 of the Code.

    (vi)  In the case of any Bond which matures within one year of the date
issued, the accrual of tax-exempt original issue discount will generally be
computed daily on a ratable basis unless the Unitholder elects to accrue such
discount under a constant yield method, compounded daily.

    (vii)  In the case of any Bond which does not mature within one year
after the date issued, tax-exempt original issue discount will accrue
daily, computed generally under a constant yield method, compounded
semiannually (with straight line interpolation between compounding dates).

    (viii)  In the case of Trusts for which Municipal Bond Investors Assurance
Corporation ("MBIA") insurance with respect to each of the Bonds deposited
therein has been obtained by the Depositor or the issuer or underwriter of the
Bonds, we have examined the form of MBIA's policy or several policies of
insurance (the "Policies") which have been delivered to the Trustee.  Assuming
issuance of Policies in such form, in our opinion, any amounts paid under said
Policies representing maturing interest on defaulted obligations held by the
Trustee will be excludable from Federal gross income if, and to the same
extent as, such interest would have been so excludable if paid by the
respective issuer, provided that, at the time such policies are purchased,
the amounts paid for such policies are reasonable, customary and consistent
with the reasonable expectation that the issuer of the bonds, rather than
the insurer, will pay debt service on the bonds.  Paragraph (ii) of this 
opinion is accordingly applicable to Policy proceeds representing maturing 
interest.
<PAGE>

    Because the Trusts do not include any "specified private activity bonds"
within the meaning of Section 57(a)(5) of the Code issued on or after August
8, 1986, none of the Trust Fund's interest income shall be treated as an item
of tax preference when computing the alternative minimum tax.  In the case of
corporations, for taxable years beginning after December 31, 1986, the alter-
native minimum tax and the Superfund Tax depend upon the corporation's
alternative minimum taxable income ("AMTI"), which is the corporation's
taxable income with certain adjustments.

    Pursuant to Section 56(c) of the Code, one of the adjustment
items used in computing AMTI and the Superfund Tax of a corporation
(other than an S Corporation, Regulated Investment Company, Real Estate
Investment Trust or REMIC) is an amount equal to 50% of the excess of such
corporation's "adjusted net book income" over an amount equal to its AMTI
(before such adjustment item and the alternative tax net operating
loss deduction).  For taxable years beginning after 1989, such adjustment item
will be 75% of the excess of such corporation's "adjusted current earnings"
over an amount equal to its AMTI (before such adjustment item and the
alternative tax net operating net operating loss deduction) pursuant to
Section 56(g) of the Code.  Both "adjusted net book income" and "adjusted
current earnings" include all tax-exempt interest, including interest on all
Bonds in the Trust, and tax-exempt original issue discount.

   Effective for tax returns filed after December 31, 1987,  all taxpayers
are required to disclose to the Internal Revenue Service the amount of
tax-exempt interest earned during the year.

    Section 265 of the Code generally provides for a reduction
in each taxable year of 100% of the otherwise deductible interest on
indebtedness incurred or continued by financial institutions, to which either 
Section 585 or Section 593 of the Code applies, to purchase or carry 
obligations acquired after August 7, 1986, the interest on which is exempt
from federal income taxes for such taxable year.  Under rules prescribed by 
Section 265, the amount of interest otherwise deductible by such financial
institutions in any taxable year which is deemed to be attributable to 
tax-exempt obligations acquired after August 7, 1986 will be the amount
that bears the same ratio to the interest deduction otherwise allowable
(determined without regard to Section 265) to the taxpayer for the taxable
year as the taxpayer's average adjusted basis (within the meaning of Section
1016) of tax-exempt obligations acquired after August 7, 1986, bears to
such average adjusted basis for all assets of the taxpayer, unless such 
financial institution can otherwise establish under regulations to be
prescribed by the Secretary of the Treasury, the amount of interest on 
indebtedness incurred or continued to purchase or carry such obligations.

<PAGE>

    We also call attention to the fact that, under Section 265 of the
Code,  interest on indebtedness incurred or continued to purchase or carry
Units by taxpayers other than certain financial institutions, as referred to
above, is not deductible for Federal income tax purposes. Under rules used by
the Internal Revenue Service for determining when borrowed funds are con-
sidered 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.
However, these rules generally do not apply to interest paid on indebtedness
incurred for expenditures of a personal nature such as a mortgage incurred to
purchase or improve a personal residence.

    "The Revenue Reconciliation Act of 1993" (the "Tax Act") subjects tax-exempt
bonds to the market discount rules of the Code effective for bonds purchased
after April 30, 1993.  In general, market discount is the amount (if any) by
which the stated redemption price at maturity exceeds an investor's purchase
price (except to the extent that such difference, if any, is attributable to
original issue discount not yet accrued) subject to a statutory de minimis rule.
Market discount can arise based on the price a Trust pays for Bonds or the price
a Unitholder pays for his or her Units.  Under the Tax Act, accretion of market
discount is taxable as ordinary income; under prior law, the accretion had been 
treated as capital gain.  Market discount that accretes while a Trust holds a 
Bond would be recognized as ordinary income by the Unitholders when principal 
payments are received on the Bond, upon sale or at redemption (including early 
redemption), or upon the sale or redemption of his or her Units, unless a 
Unitholder elects to include market discount in taxable income as it accrues.
     
    We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement (File No. 33-57383) relating to the Units referred
to above and to the use of our name and to the reference to our firm in said
Registration Statement and in the related Prospectus.

Respectfully submitted,


CHAPMAN AND CUTLER


<PAGE>

EXHIBIT 3.3


(ON VENABLE, BAETJER AND HOWARD LETTERHEAD)

2/23/95

Nuveen Tax-Exempt Unit Trust --
Series 786, Maryland Traditional Trust 304
John Nuveen & Co. Incorporated
333 West Wacker Drive
Chicago, Illinois  60606

Attn:  James J. Wesolowski, Esquire
       Vice President, General Counsel
       and Secretary

United States Trust Company of New York,
as Trustee of Nuveen Tax-Exempt Unit Trust --
Series 786, Maryland Traditional Trust 304
770 Broadway
New York, New York  10003

Gentlemen:

    We have acted as special Maryland counsel to the Nuveen Tax-Exempt Unit 
Trust-- Series 786 (the "Fund") with respect to the issuance by the Fund 
of units of fractional undivided interest in the Fund (the "Units") as  
described in a certain Registration Statement (No. 33-57383) on Form S-6
under the Securities Act of 1933, as amended (the "Registration Statement").
The Fund has been organized under a Trust Indenture and Agreement dated
as of the date hereof between John Nuveen & Co. Incorporated (the "Depositor")
and United States Trust Company of New York (the "Trustee").  The Fund will 
issue the Units in several Trusts, one of which is the Maryland Traditional
Trust 304 (the "Trust").  The Units will be purchased by various 
investors (the "Unitholders"). Each Unit of the Trust represents a fractional
undivided interest in the principal and net income of the Trust in the ratio 
of ten Units for each $1,000 principal amount of the obligations initially 
acquired by the Trust.  Each trust will be administered as a distinct entity 
with seperate certificates, investments, expenses, books and records.

    The assets of the Trust will consist of interest-bearing obligations 
issued by or on behalf of the State of Maryland, its political subdivisions 
and authorities and, provided the interest thereon is exempt from State 
income tax under the laws or treaties of the United States, obligations
issued by or on behalf of the territories or possessions of the United 
States, including Puerto Rico, the Virgin Islands and Guam, and their 
political subdivisions and authorities (the "Bonds").(N.1)  Distributions 
of the interest received by the Trust will be made semi-annually unless the 
Unitholder elects otherwise.

    You have requested our opinion as to the application of Maryland state and
local taxes to the Trust and the Unitholders.  In rendering our
opinion, we have assumed (i) that the interest on all Bonds in the Trust will 
be exempt from Federal income tax (N.2) and (ii) that the Bonds have been 
issued in strict compliance with all requirements of Maryland law and, where 
applicable, Federal or territorial law.  Furthermore, in rendering our 
opinion, we have relied on the opinion of Messrs. Chapman and Cutler, of even 
date herewith, that:
 
    (i)  The Trust will not be taxable as an association but will be governed 
by the provisions of Subchapter J (relating to trusts) of Chapter 1 of the 
Internal Revenue Code of 1986 (the "Code");

    (ii) Each Unitholder will be considered the owner of a pro rata
portion of the Trust and will be subject to Federal income tax on the income
therefrom under the provisions of Subpart E of Subchapter J of Chapter 1 of 
the Code;

    (iii) The Trust, itself, will not be subject to Federal income taxes;

    (iv) For Federal income tax purposes, each item of Trust income will have
the same character in the hands of a Unitholder as it would have in
the hands of the Trustee.  Accordingly, to the extent that the income of the
Trust consists of interest excludable from Federal gross income, such income
will be excludable from Federal gross income of the Unitholder;


<PAGE>

    (v)  For Federal income tax purposes, each Unitholder will have a
taxable event upon the redemption or sale of his Unit.  Gain or loss will
be determined by comparing the proceeds of such a redemption or sale with
the Unitholder's adjusted basis for the Unit.  Before adjustment, this basis
would be cost, if the Unitholder had purchased his Units.  For Federal
income tax purposes, if the Trustee disposes of a Trust asset (whether 
by sale, payment on maturity, retirement or otherwise), gain or loss will 
result to each Unitholder; such gain or loss is to be computed by measuring 
the Unitholder's aliquot share of the total proceeds from the transaction
against his basis for his fractional interest in the asset disposed of (such 
basis being determined by apportioning the basis for his Units among all of 
the Trust's assets ratably according to their values as of the valuation
date nearest the date on which he purchased his Units).  A 
Unitholder's basis in his Units and the basis for his fractional
interest in each Trust asset must be reduced by the amount of his aliquot 
share of interest received, if any, on Bonds delivered after the
Unitholder's settlement date to the extent that such interest accrued
on the Bonds during the period from the Unitholder's settlement date
to the date such Bonds are delivered to the Trust and must be reduced 
annually for amortization of premiums, if any, on obligations held by the
Trust.
 
    Based upon the foregoing, we are of the opinion, for Maryland State
and local tax purposes, that:

    (1)  The Trust will not be recognized as an association taxable as a
corporation, and the income of the Trust will be treated as the income of
the Unitholders.

    (2)  Interest received by the Trust on obligations of the State of
Maryland or its political subdivisions and authorities, or of territories
and possessions of the United States (to the extent federal law exempts
interest on obligations of territories or possessions of the United States
from state taxation) will be exempt from Maryland state and local income
taxes when allocated to an individual Unitholder of the Trust.

    (3)  Interest or profit realized from a sale or exchange of bonds
issued by the State of Maryland or one of its political subdivisions
derived from the Trust by a financial institution, as defined in Section
8-101(c) of the Tax-General Article of the Annotated Code of Maryland,
will be subject to the Maryland state franchise tax on financial institutions,
except to the extent such interest is expressly exempt from the Maryland state
franchise tax by the statutes which authorize the isuance of such Bonds
(See Section 8-204 of the Tax-General Article of the Annotated Code of
Maryland).


    (4)  A Unitholder will not be subject to Maryland state or local
income tax with respect to gain realized when Bonds held in the Trust are 
sold, redeemed or paid at maturity, except with respect to gain realized upon 
a sale, redemption, or payment at maturity of such Bonds as are issued by or 
on behalf of the United States' territories or possessions, their political
subdivisions and authorities; such gain will equal the proceeds of sale, 
redemption or payment, less the tax basis of the Bond (adjusted to reflect 
(a) the amortization of Bond premium or discount, and (b) the deposit in the 
Trust after the Unitholder's settlement date of Bonds with accrued
interest).
 
    (5)  Gain realized by a Unitholder from the redemption, sale or
other disposition of a Unit will be subject to Maryland state income tax
and Maryland local income tax except in the case of individual Unitholders
who are not Maryland residents.

    (6)  Maryland presently imposes an income tax on items of tax preference
with reference to such items as defined in the Code.  For taxable years
beginning after December 31, 1986, interest paid on certain private activity
bonds constitutes a tax preference pursuant to Section 57 (a) (5) of the
Code.  Accordingly, if the Maryland Series holds such bonds, 50% of the
interest would be taxable by Maryland under the provisions of Section
10-205(f) of the Tax-General Article of the Annotated Code of Maryland,
subject to a threshold amount.

    (7)  Interest on indebtedness incurred or continued (directly or
indirectly) by a Unitholder to purchase or carry Units in the Trust
will not be deductible for Maryland State or local income tax purposes.

    (8)  Trust Units will be subject to Maryland inheritance and estate tax 
only if held by Maryland residents.

    (9)  Neither the Bonds nor the Units will be subject to the Maryland
personal property tax, sales tax or use tax.

    This letter is not to be construed as a prediction of a favorable outcome
with respect to any issue for which no favorable prediction is made herein, or
as a guaranty of any tax result, or as offering an assurance or guaranty that 
a Maryland state or local taxing authority might not differ with our 
conclusions, or raise other questions or issues upon audit, or that such 
action may not be judicially sustained.

    We have not examined any of the Bonds to be deposited in the Fund and held
by the Trust, and express no opinion as to whether the interest on any such
Bonds would in fact be tax-exempt if directly received by a Unitholder;
nor have we made any review of the proceedings relating to the issuance of the
Bonds or the basis for the bond counsel opinions or the opinions of Messrs.
Chapman and Cutler referred to herein.

<PAGE>

    We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the reference to our firm in such Registration
Statement and the Preliminary Prospectus included therein.  In giving
such consent, we do not thereby admit that we are within the category of 
persons whose consent is required by Section 7 of the Securities Act of 1933, 
as amended, and the rules and regulations thereunder.


_______________________
(N.1)It is understood that, from time to time, some uninvested cash may be 
held in the Trust.



(N.2)Section 2.01 of the Indenture provides that the Depositor may deposit
delivery statements relating to contracts for the purchase of Bonds (rather 
than actual Bonds) into the Trust.  We understand that, should any such 
contract to purchase Bonds fail, the Depositor intends to pay to all 
Unitholders an amount equivalent to the interest that would have been
paid to such Unitholders had the contract not failed.  Such amount
will constitute taxable income for Federal income tax purposes.

Very truly yours,



VENABLE, BAETJER AND HOWARD


<PAGE>


EXHIBIT 3.3

(ON ORRICK, HERRINGTON & SUTCLIFFE LETTERHEAD)




2/23/95


John Nuveen & Co. Incorporated
333 W. Wacker Drive
Chicago, Illinois 60606

United States Trust Company of New York
770 Broadway
New York, NY 10003

     Re: Nuveen Tax-Exempt Unit Trust, Series 786
            
            
         California Insured Trust 243  
            
                  

Dear Sirs:

        We have acted as special California counsel for John Nuveen & Co.
Incorporated, as Depositor of the above captioned trust(s) (each a "Trust"),
in connection with the issuance under the Trust Agreement dated 2/23/95,
among John Nuveen & Co. Incorporated, as Depositor, and United States Trust
Company of New York, as Trustee, of units of fractional undivided
interest in each Trust (the "Units") in exchange for certain bonds, as well as
"regular-way" and "when-issued" contracts for the purchase of bonds (such
bonds and contracts are hereinafter referred to collectively as the
Securities").

        In connection therewith, we have examined such corporate records,
certificates and other documents and such questions of law as we have deemed
necessary or appropriate for the purpose of this opinion, and, on the basis
of such examination, and upon existing provisions of the Revenue and Taxation
Code of the State of California, with respect to each Trust, we are of the
opinion that:

        1.  The Trust is not an association taxable as a corporation
and the income of the Trust will be treated as the income of the unitholders
under the income tax laws of California.

        2.  Interest on the underlying Securities (which may include bonds
or other obligations issued by the governments of Puerto Rico, the Virgin
Islands, Guam, or the Northern Mariana Islands) which is exempt from tax
under California personal income tax and property tax laws when received by
the Trust will, under such laws, retain its status as tax-exempt interest when
distributed to unitholders.  However, interest on the underlying securities
attributed to a unitholder which is a corporation subject to the California
franchise tax laws may be includable in such corporation's gross income for
purposes of determining its California franchise tax.

        3.  Under California income tax law, each unitholder in the Trust will
have a taxable event when the Trust disposes of a security (whether by sale,
exchange, redemption, or payment at maturity) or when the unitholder redeems
or sells Units.  Because of the requirement that tax cost basis be reduced to
reflect amortization of bond premium, under some circumstances a
unitholder may realize taxable gain when units are sold or
redeemed for an amount equal to, or less than, their original cost.
The total tax cost of each Unit to a unitholder is allocated among each of
the bond issues held in the Trust (in accordance with the proportion of the
Trust comprised by each bond issue) in order to determine his per unit tax
cost for each bond issue; and the tax cost reduction requirements relating to
amortization of bond premium will apply separately to the per unit cost of
each bond issue.  Unitholders' bases in their Units, and the bases for
their fractional interest in each Trust asset, may have to be adjusted for
their pro rata share of accrued interest received, if any, on securities
delivered after the unitholders' respective settlement dates.

        4.  Under the California personal property tax laws, bonds (including
the Securities) or any interest therein is exempt from such tax.

        5.  Proceeds paid under an insurance policy, if any, issued to the
Trustee of the Trust with respect to the Securities which represent maturing
interest on defaulted obligations held by the Trustee will be exempt from
California personal income tax if, and to the same extent as, such interest
would have been so exempt if paid by the issuer of the defaulted obligations.

<PAGE> 

        6.  Under Section 17280(b)(2) of the California Revenue and
Taxation Code, interest on indebtedness incurred or continued to purchase
or carry Units of the Trust is not deductible for the purposes of the
California personal income tax.  While there presently is no California
authority interpreting this provision, Section 17280(b)(2) directs the
California Francise Tax Board to prescribe regulations determining the
proper allocation and apportionment of interest costs for this purpose.
The Franchise Tax Board has not yet proposed or prescribed such regulations.
In interpreting the generally similar Federal provision, the Internal
Revenue Service has taken the position that such indebtedness need not be
directly traceable to the purchase or carrying of Units (although the Service
has not contended that a deduction for interest on indebtedness incurred
to purchase or improve a personal residence or to purchase goods or services
for personal consumption will be disallowed).  In the absence of conflicting
regulations or other California authority, the California Franchise Tax
Board generally has interpreted California statutory tax provisions in accord
with Internal Revenue Service interpretations of similar Federal provisions.


       Opinions relating to the validity of securities and the exemption of
interest thereon from State of California income tax are rendered by bond
counsel to the issuing authority at the time securities are issued and we
have relied solely upon such opinions, or, as to securities not yet
delivered, forms of such opinions contained in official statements
relating to such securities.  Except in certain instances in which we acted
as bond counsel to issuers of securities, and as such made a review of pro-
ceedings relating to the issuance of certain securities at the time of their
issuance, we have not made any review of proceedings relating to the issuance
of securities or the bases of bond counsels' opinions.

        We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement (File No. 33-57383) relating to the Units referred to
above and to the use of our name and to the reference to our firm in said
Registration Statement and in the related Prospectus.

Very truly yours,



ORRICK, HERRINGTON & SUTCLIFFE
(BY KENNETH G. WHYBURN)



<PAGE>

EXHIBIT 4.1

(ON STANDARD & POOR'S CORPORATION LETTERHEAD)

2/23/95

John Nuveen & Company
333 West Wacker Drive
Chicago, Illinois  60606

Re:     NUVEEN TAX EXEMPT UNIT TRUST, SERIES 786

        This is in response to your requests regarding the above-captioned
fund which consists of separate underlying insured and traditional unit
investment trusts, SEC file # 33-57383.

        INSURED TRUSTS.

        With respect to the insured trusts we have reviewed the information
presented to us and have assigned a 'AAA' rating to the units of each insured
trust and a 'AAA' rating to the securities contained in each insured trust.
The ratings are direct reflections of the portfolio of each insured trust,
which will be composed soley of securities covered by bond insurance policies
that insure against default in the payment of principal and interest on the
securities contained in each insured trust for as long as they remain
outstanding.  We understand that the bonds described in the prospectus are the
same as those in the attatched list.  Since such policies have been issued by
MBIA which has been assigned a 'AAA' claims paying ability rating by S&P, S&P
has assigned a 'AAA' to the units of each insured trust and a 'AAA' rating to
the securities contained in each trust.

        You have permission to use the name of Standard & Poor's Corporation
and the above-assigned rating in connection with your dissemination of
information relating to the insured trusts provided that it is understood
that the ratings are not 'market' ratings nor recommendations to buy, hold or
sell the units of the insured trusts or the securities contained in the
insured trusts.  Further, it should be understood the rating on the units of
each insured trust does not take into account the extent to which the trust's
expenses or portfolio asset sales for less than the principal required to be
paid on the portfolio assets.  S&P reserves the right to advise its own
clients, subscribers, and the public of the ratings.  S&P relies on the
sponsor and its counsel, accountants, and other experts for the accuracy and
completeness of the information submitted in connection with the ratings.  S&P
does not independently verify the truth or accuracy of any such information.

        This letter evidences our consent to the use of the name of Standard &
Poor's Corporation in connection with the rating assigned to the units of each
insured trust in the registration statement or prospectus relating to the
units and the trusts.  However, this letter should not be construed as a
consent by us, within the meaning of section 7 of the Securities Act of 1933,
to the use of Standard and Poor's Corporation in connection with the ratings
assigned to the securities contained in the insured trusts.  You are hereby
authorized to file a copy of this letter with the Securities and Exchange
Commission.

        Please be certain to send us three copies of your final prospectus as
soon as it becomes available.  Should we not receive them within a reasonable
time after the closing or should they not conform to certification received by
us, we reserve the right to nullify the ratings.


<PAGE>



        TRADITIONAL TRUSTS.

        With respect to the traditional unit investment trusts within the
above-captioned fund, we have reviewed the information presented to us and we
hereby confirm that the ratings indicated in the prospectus as being assigned
by Standard & Poor's Corporation to the securities contained in each
traditional trust of such fund are, according to our records, the ratings
currently assigned by Standard & Poor's Corporation to such securities.  You
understand that Standard & Poor's Corporation has not consented to, and will
not consent to, being named as "expert" under the federal securities laws,
including and without limitation, Section 7 of the Securities Act of 1933,
with respect to the ratings on any securities contained in any of the
traditional trusts.

        Please note that the 'AAA' rating assigned to the units of each
insured trust does not apply to the units of any of the traditional trusts.


                                          STANDARD & POOR'S CORPORATION

                                          
                                          Vincent S. Orgo



 
<PAGE>

EXHIBIT 4.2

(On J. J. Kenny Co., Inc. Letterhead)

2/23/95

John Nuveen & Company
333 West Wacker Drive
Chicago, IL 60606

Re:  Nuveen Tax Exempt Unit Trust, Series 786

Gentlemen:

     We have examined the registration statement File No. 33-57383
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 Registration Statement 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
Registration Statement for the respective bonds comprising the trust
portfolio are the ratings currently indicated in our KENNYBASE database.

     You are hereby authorized to file a copy of this letter with the
Securities and Exchange Commission.

Sincerely,


Frank A. Ciccotto



<PAGE>

                                   MEMORANDUM

                 Nuveen Tax-Exempt Unit Trust, Series 786
                               File No. 33-57383


    The Prospectus and the Indenture filed with Amendment No. 1 of the
Registration Statement on Form S-6 have been revised to reflect information
regarding the execution of the Indenture and the deposit of bonds on 2/23/95,
and to set forth certain statistical data based thereon.  In addition, there 
are a number of other changes from the Prospectus as originally filed to which
reference is made, including the increase in the size of the Fund, a
corresponding increase in the number of Units and a change in the individual
trusts constituting the Fund.  All references to the Units, prices and related
statistical data will apply to each trust of the Fund and the Units thereof
individually.

    Except for such updating, an effort has been made to set forth below each 
of the changes and also to reflect the same by marking the Prospectus 
transmitted with the Amendment.  Also, differences between the Final 
Prospectus relating to the previous series of the Nuveen Tax-Exempt Unit 
Trust and the subject Prospectus have been indicated.

                                    FORM S-6

    FACING SHEET.  The file number is now shown.

                                 THE PROSPECTUS

     PAGE 3.       The "Estimated Long-Term Return" and "Estimated Current
Return" to Unitholders under each Trust under each of the distribution
plans are stated.

     PAGES 4 - 5.  Essential information for each of the Trusts, including
applicable footnotes, has been completed for this Series.

     PAGES 5 - 6.  The date of the Indenture has been inserted in Section 1
along with the size and number of Units of each of the Trusts.

     PAGE 8 et seq. The following information for each Trust appears on the
pages relating to such trust:

         The estimated daily accrual of interest under the plans of
         distribution for each of the Trusts

         Data regarding the composition of the portfolio of each
         Trust

         Disclosure regarding the states' economic and legislative
         matters relevant to investors of state trusts

         Concentrations of issues by purpose in each Trust

         The approximate percentage of the bonds in the
         portfolio of each Trust acquired in distributions where
         the Sponsor was either the sole underwriter or manager
         or member of the underwriting syndicate

         The percentage of "when issued" bonds in the portfolio
         of each Trust

         The schedule of investments for each Trust, including
         the notes thereto

         Descriptions of the opinions of the special tax
         counsel for state trusts

         The Record Dates and Distribution Dates for
         interest distributions for each Trust

         The distribution table for each Trust

         Taxable Equivalent Estimated Current Return Tables for residents
         of the respective jurisdictions

         The statements of condition for each Trust
         and the accountant's report with regard thereto.

         The amount of the Trustee's Fee

                             THE INDENTURE

The Schedules to the Indenture have been completed.


CHAPMAN AND CUTLER


Chicago, Illinois

2/23/95


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