NUVEEN TAX EXEMPT UNIT TRUST SERIES 785
487, 1995-02-17
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<PAGE>


                                                      File No. 33-57365
                                                      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 785

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 2/17/95 at 1:30 p.m. pursuant to Rule 487.
______



<PAGE>
   
                               FEBRUARY 17, 1995
                             SUBJECT TO COMPLETION
 
NUVEEN  Tax-Exempt Unit Trusts
             PROSPECTUS
            Series 785
             February 17, 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 785 consists of six underlying separate
unit investment  trusts  designated  as Short  Intermediate  Insured  Trust  39,
Colorado  Insured Trust 56, Massachusetts Insured  Trust 123, New Jersey Insured
Trust 187, New York Insured Trust  231 and Pennsylvania Insured Trust 194.  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.) For Estimated Cash Flow Tables for Short Intermediate Insured  Trust
39, see page 10.
    
 
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
      Short Intermediate Insured Trust 39                     3         9-14
      Colorado Insured Trust 56                               3        15-22
      Massachusetts Insured Trust 123                         3        23-35
      New Jersey Insured Trust 187                            3        36-43
      New York Insured Trust 231                              3        44-57
      Pennsylvania Insured Trust 194                          3        58-67
      GENERAL MATTERS
      Accrued Interest                                        8         A-17
      Accumulation Plan                                      14         A-25
      Bonds, How Selected                                     3            8
      Bonds, Initial Determination of Offering Price         10         A-19
      Bonds, Limited Right of Substitution                    4          A-7
      Bond Ratings                                            3         9-67
      Bonds, Removal from Trust                              21         A-34
      Call Provisions of Portfolio Bonds                   3, 4     9-67,A-8
      Capital Gains Taxability                               11         A-19
      Dealer Discount                                        17         A-29
      Description of Units of Trust                           1            6
      Distributions to Unitholders                           13         A-23
      Distribution Payment Dates                          3, 13   9-67, 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         9-67
      Investments, Schedules of                               3         9-67
      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            7
      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         9-67
      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>
  --------------------------------------------------------------------------------------
  Short Intermediate Insured Trust 39......      4.89%         4.92%           4.94%
  Colorado Insured Trust 56................      5.54%         5.58%           5.59%
  Massachusetts Insured Trust 123..........      5.67%         5.70%           5.72%
  New Jersey Insured Trust 187.............      5.64%         5.67%           5.69%
  New York Insured Trust 231...............      5.66%         5.69%           5.71%
  Pennsylvania Insured Trust 194...........      5.67%         5.70%           5.72%
</TABLE>
 
                           ESTIMATED CURRENT RETURNS
 
<TABLE>
<CAPTION>
                                                          PLAN OF DISTRIBUTION
                                                ----------------------------------------
                    TRUST                       MONTHLY      QUARTERLY      SEMI-ANNUAL
  <S>                                           <C>          <C>            <C>
  --------------------------------------------------------------------------------------
  Short Intermediate Insured Trust 39......      4.72%         4.75%           4.77%
  Colorado Insured Trust 56................      5.51%         5.54%           5.56%
  Massachusetts Insured Trust 123..........      5.53%         5.57%           5.58%
  New Jersey Insured Trust 187.............      5.56%         5.59%           5.61%
  New York Insured Trust 231...............      5.59%         5.62%           5.64%
  Pennsylvania Insured Trust 194...........      5.61%         5.64%           5.66%
</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 16, 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>
                                                         SHORT
                                                     INTERMEDIATE          COLORADO          MASSACHUSETTS
                                                        INSURED             INSURED             INSURED
                                                       TRUST 39            TRUST 56            TRUST 123
<S>                                                 <C>                 <C>                 <C>
                                                    ---------------     ---------------     ---------------
Principal Amount of Bonds in Trust................  $    7,500,000      $    3,500,000      $    3,500,000
Number of Units...................................          75,000              35,000              35,000
Fractional Undivided Interest in Trust Per Unit...        1/75,000            1/35,000            1/35,000
Public Offering Price--Less than 500 Units
    Aggregate Offering Price of Bonds in Trust....  $    7,473,040      $    3,366,735      $    3,275,681
    Divided by Number of Units....................  $        99.64      $        96.19      $        93.59
    Plus Sales Charge*............................  $         3.08      $         4.96      $         4.82
    Public Offering Price Per Unit(1).............  $       102.72      $       101.15      $        98.41
Redemption Price Per Unit (exclusive of accrued
  interest).......................................  $        99.39      $        95.71      $        93.13
Sponsor's Initial Repurchase Price Per Unit
  (exclusive of accrued interest).................  $        99.64      $        96.19      $        93.59
Excess of Public Offering Price Per Unit over
  Redemption Price Per Unit.......................  $         3.33      $         5.44      $         5.28
Excess of Public Offering Price Per Unit over
  Sponsor's Repurchase Price Per Unit.............  $         3.08      $         4.96      $         4.82
Calculation of Estimated Net Annual Interest
  Income Per Unit
    Annual Interest Income(2).....................  $       5.0473      $       5.7893      $       5.6649
    Less Estimated Annual Expense.................  $        .2028      $        .2127      $        .2203
                                                    ---------------     ---------------     ---------------
    Estimated Net Annual Interest Income(3).......  $       4.8445      $       5.5766      $       5.4446
Daily Rate of Accrual Per Unit....................  $       .01345      $       .01549      $       .01512
Estimated Current Return(4).......................           4.72%               5.51%               5.53%
Estimated Long Term Return(4).....................           4.89%               5.54%               5.67%
BECAUSE  CERTAIN OF THE BONDS IN THE TRUSTS WILL NOT BE DELIVERED TO THE TRUSTEE UNTIL AFTER THE SETTLEMENT
DATE FOR A PURCHASE OF UNITS MADE ON THE DATE OF DEPOSIT, INTEREST THAT ACCRUES ON THOSE BONDS BETWEEN  THE
DATE  OF DEPOSIT AND SUCH DELIVERY DATE WILL BE TREATED  AS A RETURN OF PRINCIPAL RATHER THAN AS TAX-EXEMPT
INCOME. THE AMOUNT OF  ANY SUCH RETURN  OF PRINCIPAL IS NOT  INCLUDED IN THE  ANNUAL INTEREST INCOME  SHOWN
ABOVE. FOR THE VARIOUS TRUSTS, THE FOLLOWING SETS FORTH THE LATEST SCHEDULED BOND DELIVERY DATE, THE AMOUNT
PER  UNIT THAT WILL BE TREATED AS A RETURN OF PRINCIPAL TO UNITHOLDERS WHO PURCHASE ON THE DATE OF DEPOSIT,
AND THE ESTIMATED CURRENT RETURN AFTER THE FIRST YEAR, ASSUMING THE PORTFOLIO AND ESTIMATED ANNUAL EXPENSES
DO NOT VARY FROM THAT SET FORTH ABOVE (SEE SECTIONS 3 AND 12 AND THE "SCHEDULES OF INVESTMENTS"):
                                   LATEST SCHEDULED         PER UNIT         ESTIMATED CURRENT RETURN
                                    DELIVERY DATE     RETURN OF PRINCIPAL      AFTER THE FIRST YEAR
                                  ------------------  --------------------   -------------------------
  SHORT INTERMEDIATE INSURED
  TRUST.........................    MARCH 9, 1995     $           .02                     4.73        %
 
<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: Short
    Intermediate Insured Trust--$.14, Colorado Insured Trust--$.15 and Massachusetts Insured Trust--$.15. (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 (CONTINUED)
 
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>
                                                      NEW JERSEY           NEW YORK          PENNSYLVANIA
                                                        INSURED             INSURED             INSURED
                                                       TRUST 187           TRUST 231           TRUST 194
<S>                                                 <C>                 <C>                 <C>
                                                    ---------------     ---------------     ---------------
Principal Amount of Bonds in Trust................  $    3,500,000      $    3,500,000      $    3,500,000
Number of Units...................................          35,000              35,000              35,000
Fractional Undivided Interest in Trust Per Unit...        1/35,000            1/35,000            1/35,000
Public Offering Price--Less than 500 Units
    Aggregate Offering Price of Bonds in Trust....  $    3,355,776      $    3,320,711      $    3,326,095
    Divided by Number of Units....................  $        95.88      $        94.88      $        95.03
    Plus Sales Charge*............................  $         4.94      $         4.89      $         4.90
    Public Offering Price Per Unit(1).............  $       100.82      $        99.77      $        99.93
Redemption Price Per Unit (exclusive of accrued
  interest).......................................  $        95.40      $        94.37      $        94.51
Sponsor's Initial Repurchase Price Per Unit
  (exclusive of accrued interest).................  $        95.88      $        94.88      $        95.03
Excess of Public Offering Price Per Unit over
  Redemption Price Per Unit.......................  $         5.42      $         5.40      $         5.42
Excess of Public Offering Price Per Unit over
  Sponsor's Repurchase Price Per Unit.............  $         4.94      $         4.89      $         4.90
Calculation of Estimated Net Annual Interest
  Income Per Unit
    Annual Interest Income(2).....................  $       5.8306      $       5.7995      $       5.8321
    Less Estimated Annual Expense.................  $        .2250      $        .2242      $        .2232
                                                    ---------------     ---------------     ---------------
    Estimated Net Annual Interest Income(3).......  $       5.6056      $       5.5753      $       5.6089
Daily Rate of Accrual Per Unit....................  $       .01557      $       .01548      $       .01558
Estimated Current Return(4).......................           5.56%               5.59%               5.61%
Estimated Long Term Return(4).....................           5.64%               5.66%               5.67%
 
<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:  New
    Jersey Insured Trust--$.16, New York Insured Trust--$.15 and Pennsylvania Insured Trust-- $.16. (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>
 
                                       5
<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 17, 1995
Settlement Date......................................................February 27, 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>
  Short Intermediate Insured Trust 39......          $1.5756          $1.2556         $1.0656
  Colorado Insured Trust 56................           1.5526           1.2326          1.0426
  Massachusetts Insured Trust 123..........           1.6282           1.3082          1.1182
  New Jersey Insured Trust 187.............           1.6751           1.3551          1.1651
  New York Insured Trust 231...............           1.6673           1.3473          1.1573
  Pennsylvania Insured Trust 194...........           1.6577           1.3377          1.1477
  ------------
  * 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>
  Short Intermediate Insured Trust 39......       6710A0 460       6710A0 478      6710A0 486
  Colorado Insured Trust 56................       6706E9 192       6706E9 200      6706E9 218
  Massachusetts Insured Trust 123..........       670947 282       670947 290      670947 308
  New Jersey Insured Trust 187.............       6706L6 646       6706L6 653      6706L6 661
  New York Insured Trust 231...............       67101K 227       67101K 235      67101K 243
  Pennsylvania Insured Trust 194...........       6706H9 827       6706H9 835      6706H9 843
</TABLE>
 
                            ------------------------
 
THE NUVEEN TAX-EXEMPT UNIT TRUST
   
SERIES 785
    
 
   
1.  WHAT IS THE NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 785?
    
   
Series  785 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 six underlying
separate  unit  investment  trusts,  combined  under  one  trust  indenture  and
agreement,  designated  Short Intermediate  Insured  Trust 39,  Colorado Insured
Trust 56, Massachusetts  Insured Trust 123,  New Jersey Insured  Trust 187,  New
York  Insured Trust 231  and Pennsylvania Insured Trust  194. 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."  THERE
ARE NO TRADITIONAL TRUSTS IN THIS SERIES. This Series was created under the laws
of   the   State   of   New   York   pursuant   to   a   Trust   Indenture   and
    
 
                                       6
<PAGE>
   
Agreement dated February 17,  1995 (the "Indenture") between  John Nuveen &  Co.
Incorporated  (the "Sponsor") and  United States Trust Company  of New York (the
"Trustee").
    
 
   
    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  $25,000,000 (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: $7,500,000 in  the Short  Intermediate Insured Trust,  $3,500,000 in  the
Colorado   Insured  Trust,  $3,500,000  in   the  Massachusetts  Insured  Trust,
$3,500,000 in the New Jersey Insured  Trust, $3,500,000 in the New York  Insured
Trust  and $3,500,000  in the Pennsylvania  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 75,000 Units
of the Short Intermediate  Insured Trust, 35,000 Units  of the Colorado  Insured
Trust,  35,000 Units of the Massachusetts Insured Trust, 35,000 Units of the New
Jersey Insured Trust,  35,000 Units  of the New  York Insured  Trust and  35,000
Units  of the Pennsylvania 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 Short  Intermediate
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
 
                                       7
<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.
 
                                       8
<PAGE>
   
SHORT INTERMEDIATE INSURED TRUST 39
    
   
    The Portfolio of Short Intermediate Insured Trust 39 consists of 13 short to
intermediate  term (approximately 3 to 7  year maturities) obligations issued by
entities located in 9 states. Five Bonds in the Trust are general obligations of
the governmental  entities issuing  them and  are backed  by the  taxing  powers
thereof.  Eight 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:  Bridge and  Toll Road  Revenue, 1;  Resource Recovery  Revenue, 1;
Municipal Lease Revenue, 5; 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 percent of the principal amount of Bonds
in the Trust consists of issues of  entities located in the State of  California
and  twenty percent of  the principal amount  of Bonds in  the Trust consists of
issues of entities located in the State of Texas; 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  Short
Intermediate  Insured Trust is 5.0 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 7.3% of  the aggregate principal  amount of the  Bonds in  the
Trust  (accounting for approximately 6.0% of the aggregate offering price of the
Bonds) are  original issue  discount obligations.  All of  these original  issue
discount bonds are "zero coupon" 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 37% 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 between February 14,
1995 and February 16, 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>
  $7,453,948       $19,092           $379,935      $7,454,290                 .25%
</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  Short Intermediate Insured Trust, less  estimated expenses, is estimated to
accrue at the rate  of $.01359 per  Unit per day under  the semi-annual plan  of
distribution, $.01354 per Unit per day under
    
 
                                       9
<PAGE>
   
the  quarterly  plan of  distribution and  $.01345  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 Short Intermediate 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
SHORT INTERMEDIATE 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.............  $   .5940(1)                                              $  4.8630
                                                        --------  $.4050 every month  --------
Quarterly Distribution Plan...........  $   .5940(1)   $   .4077(2)   $  1.2231      $  1.2231    $  4.8950
Semi-Annual Distribution Plan.........  $   .5940(1)   $   .4095(3)                  $  2.4570    $  4.9140
- ----------------------------------------------------------------------------------------------------------------
<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--SHORT INTERMEDIATE INSURED TRUST
 
    For a discussion of  the tax status of  income earned on Short  Intermediate
Insured Trust Units, See Section 11.
 
   
ESTIMATED MONTHLY CASH FLOW TABLE FOR SHORT INTERMEDIATE INSURED TRUST 39
    
    Following  is an Estimated  Monthly Cash Flow  Table for the above-captioned
Trust. As discussed below, the Table assumes  that the Bonds will remain in  the
Trust  until the date to which each bond is priced under accepted bond practice.
The Table is based on data and assumptions as to maturity and redemption  dates,
bond  pricing dates and  call dates, if any,  as of the date  of deposit, and is
thus subject to  change. Accordingly,  Unitholders should not  assume that  they
will in fact receive cash in the amounts and on the dates specified in the Table
and the Table cannot be used to predict the exact amount of distributions by the
Trust.
 
    The   Table  shows  the  amount  of  each  month's  interest  and  principal
distributions on one Unit  of the Trust if  every bond in the  Trust were to  be
redeemed  on the  date to which  it is priced  (the " 'priced  to' date"). Under
accepted bond  pricing practice,  tax-exempt bonds  are customarily  offered  to
investors  on a "yield price" basis,  which involves computation of yield either
to maturity or to an  earlier call date, whichever  produces the lower yield.  A
bond  whose market value exceeds its par value (a "premium bond") will generally
be priced to its call date, if any; in other words, its "priced to" date is  its
call  date. In contrast, the "priced to"  date for discount bonds will generally
be the maturity date. Because none of the Bonds in the Trust have optional  call
dates,  each Bond  in the  Trust is  priced to  its maturity  date regardless of
whether the Bond is a  discount or a premium bond,  i.e. the Table assumes  that
each  Bond will remain  in the Trust  until maturity. There  can be no assurance
that every Bond will in fact remain in the Trust until maturity. Some Bonds  may
be  sold by  the Trustee  before maturity,  either to  pay Unitholders  who have
redeemed their Units or pursuant to the
 
                                       10
<PAGE>
Sponsor's continuing  program  of  credit surveillance.  Certain  Bonds  may  be
subject  to to  sinking fund redemptions  or extraordinary  redemptions, as more
fully described below at "Composition  of Trusts--Sale, maturity and  redemption
of bonds"
 
    The  Trust's actual cash flow  will depend on (1)  the extent to which Bonds
are sold as a result of the Sponsor's continuing program of credit surveillence,
and (2) the extent to  which Bonds are sold to  pay for units redeemed. For  the
reasons above, it is unlikely that interest and principal will be distributed in
the amounts and on the dates indicated in the Table.
 
            ESTIMATED PRINCIPAL AND INTEREST DISTRIBUTIONS PER UNIT
<TABLE>
<CAPTION>
  Month                     Monthly
  /Year                     Option
- ---------                 -----------
<S>        <C>            <C>
                           $
 Mar 95                       0.0000
 Apr 95                       0.0000
 May 95                       0.5943
 Jun 95                       0.4052
 Jul 95                       0.4052
 Aug 95                       0.4052
 Sep 95                       0.4052
 Oct 95                       0.4052
 Nov 95                       0.4052
 Dec 95                       0.4052
 Jan 96                       0.4052
 Feb 96                       0.4052
 Mar 96                       0.4052
 Apr 96                       0.4052
 May 96                       0.4052
 Jun 96                       0.4052
 Jul 96                       0.4052
 Aug 96                       0.4052
 Sep 96                       0.4052
 Oct 96                       0.4052
 Nov 96                       0.4052
 Dec 96                       0.4052
 Jan 97                       0.4052
 Feb 97                       0.4052
 Mar 97                       0.4052
 Apr 97                       0.4052
 May 97                       0.4052
 Jun 97                       0.4052
 Jul 97                       0.4052
 Aug 97                       0.4052
 Sep 97                       0.4052
 Oct 97                       0.4052
 Nov 97                       0.4052
 
<CAPTION>
  Month                     Monthly
  /Year                     Option
- ---------                 -----------
<S>        <C>            <C>
                           $
 Dec 97                       0.4052
 Jan 98                       0.4052
 Feb 98                       0.4052
 Mar 98                       0.4052
 Apr 98                       0.4052
 May 98                       0.4052
 Jun 98                       0.4052
 Jul 98                       0.4052
 Aug 98                       0.4052
 Sep 98                       0.4052
 Oct 98                       0.4052
 Nov 98                       0.4052
 Dec 98                       0.4052
 Jan 99                       0.4052
 Feb 99                       7.7385
 Mar 99                       0.4064
 Apr 99                       0.4064
 May 99                       0.4064
 Jun 99                       0.4064
 Jul 99                       0.4064
 Aug 99                       0.4064
 Sep 99                       0.4064
 Oct 99                       0.4064
 Nov 99                      12.0064
 Dec 99                       0.3584
 Jan 00                      10.3584
 Feb 00                      23.7164
 Mar 00                      10.2194
 Apr 00                       0.1774
 May 00                       0.1774
 Jun 00                       0.1774
 Jul 00                      10.1774
 Aug 00                      27.7957
</TABLE>
 
                                       11
<PAGE>
NATIONALLY DIVERSIFIED TRUST TAXABLE ESTIMATED CURRENT RETURN TABLE
(SHORT INTERMEDIATE INSURED 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.
 
  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      4.25%   4.50%   4.75%   5.00%   5.25%   5.50%   5.75%   6.00%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 39.0 $     0-114.7      15.0   %     5.00    5.29    5.59    5.88    6.18    6.47    6.76    7.06
    39.0- 94.3       0-114.7      28.0         5.90    6.25    6.60    6.94    7.29    7.64    7.99    8.33
                 114.7-172.1      29.0         5.99    6.34    6.69    7.04    7.39    7.75    8.10    8.45
    94.3-143.6       0-114.7      31.0         6.16    6.52    6.88    7.25    7.61    7.97    8.33    8.70
                 114.7-172.1      32.0         6.25    6.62    6.99    7.35    7.72    8.09    8.46    8.82
                 172.1-294.6      34.5         6.49    6.87    7.25    7.63    8.02    8.40    8.78    9.16
   143.6-256.5   114.7-172.1      37.0         6.75    7.14    7.54    7.94    8.33    8.73    9.13    9.52
                 172.1-294.6      40.0         7.08    7.50    7.92    8.33    8.75    9.17    9.58   10.00
                  Over 294.6      37.0   2     6.75    7.14    7.54    7.94    8.33    8.73    9.13    9.52
    Over 256.5   172.1-294.6      44.0         7.59    8.04    8.48    8.93    9.38    9.82   10.27   10.71
                  Over 294.6      41.0   3     7.20    7.63    8.05    8.47    8.90    9.32    9.75   10.17
</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      4.25%   4.50%   4.75%   5.00%   5.25%   5.50%   5.75%   6.00%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 23.4 $     0-114.7      15.0   %     5.00    5.29    5.59    5.88    6.18    6.47    6.76    7.06
    23.4- 56.6       0-114.7      28.0         5.90    6.25    6.60    6.94    7.29    7.64    7.99    8.33
    56.6-118.0       0-114.7      31.0         6.16    6.52    6.88    7.25    7.61    7.97    8.33    8.70
                 114.7-237.2      32.5         6.30    6.67    7.04    7.41    7.78    8.15    8.52    8.89
   118.0-256.5   114.7-237.2      38.0         6.85    7.26    7.66    8.06    8.47    8.87    9.27    9.68
                  Over 237.2      37.0   2     6.75    7.14    7.54    7.94    8.33    8.73    9.13    9.52
    Over 256.5    Over 237.2      41.0   3     7.20    7.63    8.05    8.47    8.90    9.32    9.75   10.17
<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>
 
                                       12
<PAGE>
    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 17, 1995
SHORT INTERMEDIATE INSURED TRUST 39
(SERIES 785)
    
 
<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>
- ---------------------------------------------------------------------------------------------------------------------------
$   550,000      North Slope Borough, Alaska, General Obligation  No Optional Call      AAA         Aaa     $       449,152
                   Bonds, Series 1993B, 0.00% Due 1/1/99.
                   (Original issue discount bonds delivered on
                   or about October 5, 1993 at a price of
                   78.197% of principal amount.)
    575,000      North Slope Borough, Alaska, General Obligation  No Optional Call      AAA         Aaa             578,933
                   Bonds, Series 1992A, 5.55% Due 6/30/00.
    750,000      City of Mesa, Arizona, General Obligation        No Optional Call      AAA         Aaa             774,278
                   Refunding Bonds, Series 1991, 5.90% Due
                   7/1/00.
    750,000     * Municipal Improvement Corporation of Los        No Optional Call      AAA         Aaa             751,598
                   Angeles (California), Sanitation Equipment
                   Charge Revenue Bonds, Series 1995-A, 5.25%
                   Due 2/1/00. (When issued.)
    750,000      California Transit Finance Corporation,          No Optional Call      AAA         Aaa             770,745
                   Certificates of Participation, 1992 Series B,
                   Los Angeles County Transportation Commission,
                   5.90% Due 7/1/00.
    335,000      State of Hawaii, General Obligation Bonds of     No Optional Call      AAA         Aaa             339,971
                   1995, Series CJ, 5.50% Due 1/1/00.
    520,000      Jefferson County (Kentucky), School District     No Optional Call      AAA         Aaa             503,474
                   Finance Corporation, School Building Revenue
                   Bonds (Series 1994A), 4.70% Due 1/1/00.
    650,000      The Turnpike Authority of Kentucky, Economic     No Optional Call      AAA         Aaa             653,406
                   Development Road Revenue Refunding Bonds
                   (Revitalization Projects), Series 1992,
                   5.375% Due 1/1/00.
    750,000      New Jersey Transportation Trust Fund Authority,  No Optional Call      AAA         Aaa             777,540
                   Transportation System Bonds, 1992 Series A,
                   6.00% Due 6/15/00.
    250,000      New York State Thruway Authority, General        No Optional Call      AAA         Aaa             250,000
                   Revenue Bonds, Series C, 5.20% Due 1/1/00.
                   (When issued.)
    120,000      State of Ohio (Ohio Building Authority), State   No Optional Call      AAA         Aaa             122,435
                   Facilities Bonds, (Adult Correctional
                   Building Fund Projects), 1992 Series A, 5.60%
                   Due 10/1/99.
    750,000      City of Houston, Texas, Water and Sewer System,  No Optional Call      AAA         Aaa             751,508
                   Prior Lien Revenue Refunding Bonds, Series
                   1992B, 5.25% Due 12/1/99.
    750,000     * Texas Public Finance Authority, State of Texas, No Optional Call      AAA         Aaa             750,000
                   General Obligation Refunding Bonds, Series
                   1995A, 5.10% Due 10/1/99. (When issued.)
- -----------                                                                                                 ---------------
$ 7,500,000                                                                                                 $     7,473,040
- -----------                                                                                                 ---------------
- -----------                                                                                                 ---------------
</TABLE>
 
See Notes to Schedules of Investments, page 68.
 
   
* These  Bonds,  or a  portion thereof,  have delivery  dates beyond  the normal
  settlement date. Their expected delivery dates range from February 28, 1995 to
  March 9, 1995. Contracts relating to Bonds with delivery dates after the  date
  of   settlement  for  purchase   made  on  the   Date  of  Deposit  constitute
  approximately 20% of the aggregate principal amount of the Trust. (See Section
  4.)
    
 
                                       14
<PAGE>
   
COLORADO INSURED TRUST 56
    
 
   
    The  Portfolio of Colorado Insured Trust 56 consists of 6 obligations issued
by entities located in Colorado and  one obligation issued by an entity  located
in  the Territory of Puerto Rico. 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: College  and University Revenue,  1; Electrical  System Revenue, 1;
Health Care Facility  Revenue, 2;  Combination Utility  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.
    
 
   
    At the Date of Deposit,  the average maturity of  the Bonds in the  Colorado
Insured  Trust is 25.0  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 13.6% of the  aggregate principal amount of  the Bonds in  the
Trust (accounting for approximately 13.2% 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 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 15, 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>
  $3,346,090       $20,645           $202,625      $3,349,860                 .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 Colorado Insured Trust, less estimated  expenses, is estimated to accrue  at
the rate of $.01563 per Unit per day under the semi-annual plan of distribution,
$.01557  per Unit per day  under the quarterly plan  of distribution and $.01549
per Unit per day under the monthly plan of
    
 
                                       15
<PAGE>
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  Colorado 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
COLORADO 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.............  $   .6815(1)                                              $  5.5766
                                                        --------  $.4647 every month  --------
Quarterly Distribution Plan...........  $   .6815(1)   $   .4671(2)   $  1.4013      $  1.4013    $  5.6086
Semi-Annual Distribution Plan.........  $   .6815(1)   $   .4689(3)                  $  2.8134    $  5.6276
- ----------------------------------------------------------------------------------------------------------------
<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--COLORADO INSURED TRUST
 
    For  a discussion  of the  Federal tax status  of income  earned on Colorado
Insured Trust Units, see Section 11.
 
    In the opinion of Sherman &  Howard L.L.C., special Colorado counsel to  the
Series, under existing law:
 
        A  Colorado Insured Trust will consist  of obligations which were issued
    by the State  of Colorado  or its political  subdivisions or  by the  United
    States or possessions of the United States including Puerto Rico, the Virgin
    Islands and Guam ("Colorado Bonds").
 
        Because  Colorado income tax  law is based  upon the Federal  law and in
    light of the opinion  of Chapman and Cutler,  the Colorado Insured Trust  is
    not  an association taxable as a corporation for purposes of Colorado income
    taxation.
 
        With respect  to  Colorado  Unitholders, in  view  of  the  relationship
    between  Federal  and  Colorado  tax computations  described  above  and the
    opinion of Chapman and Cutler referred to above:
 
        Each Colorado Unitholder will be treated as owning a share of each asset
    of the  Colorado Insured  Trust for  Colorado income  tax purposes,  in  the
    proportion  that the number of Units of such  Trust held by him bears to the
    total number of  outstanding Units of  the Colorado Insured  Trust, and  the
    income of the Colorado Insured Trust will therefore be treated as the income
    of each Colorado Unitholder under Colorado law in the proportion described.
 
                                       16
<PAGE>
        Interest  on Colorado Bonds that would not be subject to Colorado income
    tax or Colorado  alternative minimum tax  when paid directly  to a  Colorado
    Unitholder will not be subject to Colorado income tax or alternative minimum
    tax  when  received by  the Colorado  Insured Trust  and attributed  to such
    Colorado Unitholder and when distributed to such Colorado Unitholder.
 
        Any proceeds paid under an insurance policy issued to the issuer of  the
    Colorado  Bonds involved, to the Depositor  prior to deposit of the Colorado
    Bonds in the Colorado Insured Trust, or to the Colorado Insured Trust, which
    proceeds represent maturing interest on  defaulted Colorado Bonds and  which
    proceeds  would not be subject to Colorado income tax or alternative minimum
    tax when  paid directly  to a  Colorado Unitholder  will not  be subject  to
    Colorado  income and alternative  minimum tax when  received by the Colorado
    Insured  Trust  and  attributed  to   such  Colorado  Unitholder  and   when
    distributed to such Colorado Unitholder.
 
        Each  Colorado Unitholder will realize gain  or loss taxable in Colorado
    when the Colorado  Insured Trust  disposes of  a Colorado  Bond (whether  by
    sale,  exchange, redemption  or payment  at maturity)  or when  the Colorado
    Unitholder redeems or sells Units at a price that differs from original cost
    as adjusted for  amortization of bond  discount or premium  and other  basis
    adjustments (including any basis reduction that may be required to reflect a
    Colorado  Unitholder's share of interest, if any, accruing on Colorado Bonds
    during the interval  between the Colorado  Unitholder's settlement date  and
    the date such Colorado Bonds are delivered to the Colorado Insured Trust, if
    later).
 
        Tax cost reduction requirements relating to amortization of bond premium
    may, under some circumstances, result in Colorado Unitholders realizing gain
    taxable  in Colorado  when their  Units are sold  or redeemed  for an amount
    equal to or less than their original cost.
 
        If  interest  on  indebtedness  incurred  or  continued  by  a  Colorado
    Unitholder to purchase Units in the Colorado Insured Trust is not deductible
    for  Federal income  tax purposes,  it will  not be  deductible for Colorado
    income tax purposes.
 
ECONOMIC FACTORS--COLORADO
 
   
    RESTRICTIONS  ON  APPROPRIATIONS  AND  REVENUES.    The  State  Constitution
requires  that expenditures  for any  fiscal year  not exceed  revenues for such
fiscal year.  By statute,  the amount  of General  Fund revenues  available  for
appropriation  is  based  upon  revenue  estimates  which,  together  with other
available resources,  must exceed  annual appropriations  by the  amount of  the
unappropriated   reserve  (the  "Unappropriated  Reserve").  The  Unappropriated
Reserve requirement for fiscal years 1991, 1992 and 1993 was set at 3% of  total
appropriations  from the General Fund. For fiscal years 1994 and thereafter, the
Unappropriated  Reserve  retirement   is  set   at  4%.  In   addition  to   the
Unappropriated  Reserve, a constitutional amendment  approved by Colorado voters
in 1992  requires the  State and  each  local government  to reserve  a  certain
percentage  of  its fiscal  year spending  (excluding  bonded debt  service) for
emergency use (the "Emergency Reserve").  The minimum Emergency Reserve was  set
at  1% for 1993 and 2% for  1994 and is set at 3%  for 1995 and later years. For
fiscal year 1992 and thereafter, General Fund appropriations are also limited by
statute  to  an  amount  equal  to  the  cost  of  performing  certain  required
reappraisals  of taxable property plus an amount equal to the lesser of (i) five
percent of  Colorado personal  income or  (ii) 106%  of the  total General  Fund
appropriations  for the previous fiscal year. This restriction does not apply to
any General Fund appropriations which are required as a result of a new  federal
law, a final state or federal court order or moneys derived from the increase in
the
    
 
                                       17
<PAGE>
rate  or amount  of any  tax or  fee approved  by a  majority of  the registered
electors of the State voting at any general election. In addition, the statutory
limit on the level of  General Fund appropriations may  be exceeded for a  given
fiscal  year  upon the  declaration of  a  State fiscal  emergency by  the State
General Assembly.
 
   
    The 1993 fiscal year ending General  Fund balance was $326.8 million,  which
was  $196.9  million  over  the combined  Unappropriated  Reserve  and Emergency
Reserve requirement. The 1994 fiscal year ending General Fund balance (exclusive
of $39.0 million allocated to Emergency  Reserve) was $320.4 million, or  $188.6
million  over the  required Unappropriated Reserve.  Based on  December 20, 1995
estimates, the 1995 fiscal year ending General Fund balance (exclusive of  $74.1
million  allocated to  Emergency Reserve) is  expected to be  $276.8 million, or
$135.1 million over the required Unappropriated Reserve.
    
    On November 3, 1992, voters in Colorado approved a constitutional  amendment
(the  "Amendment") which,  in general, became  effective December  31, 1992, and
could restrict  the ability  of  the State  and  local governments  to  increase
revenues  and impose  taxes. The  Amendment applies to  the State  and all local
governments, including home rule entities ("Districts"). Enterprises, defined as
government-owned businesses  authorized to  issue  revenue bonds  and  receiving
under  10%  of  annual revenue  in  grants  from all  Colorado  state  and local
governments combined, are excluded from the provisions of the Amendment.
 
   
    The provisions  of the  Amendment  are unclear  and have  required  judicial
interpretation.   Among  other  provisions,  beginning  November  4,  1992,  the
Amendment requires voter approval prior to  tax increases, creation of debt,  or
mill levy or valuation for assessment ratio increases. The Amendment also limits
increases  in  government  spending  and  property  tax  revenues  to  specified
percentages. The Amendment requires that District property tax revenues yield no
more than  the prior  year's  revenues adjusted  for inflation,  voter  approved
changes  and (except with  regard to school districts)  local growth in property
values according to a formula set  forth in the Amendment. School districts  are
allowed  to adjust tax levies for changes in student enrollment. Pursuant to the
Amendment, local government spending is to be limited by the same formula as the
limitation  for  property  tax  revenues.  The  Amendment  limits  increases  in
expenditures  from the State  General Fund and program  revenues (cash funds) to
the growth in inflation  plus the percentage change  in State population in  the
prior  calendar  year. The  bases for  initial spending  and revenue  limits are
fiscal year 1992 spending and 1991  property taxes collected in 1992. The  bases
for spending and revenue limits for fiscal year 1994 and later years will be the
prior  fiscal year's spending and property taxes collected in the prior calendar
year. Debt service  changes, reductions and  voter-approved revenue changes  are
excluded  from  the  calculation  bases. The  Amendment  also  prohibits  new or
increased real property transfer  tax rates, new State  real property taxes  and
local District income taxes.
    
 
   
    Litigation  concerning  several issues  relating to  the Amendment  has been
brought in  the  Colorado courts.  The  litigation deals  with  three  principal
issues:  (i) whether Districts can  increase mill levies to  pay debt service on
general obligation  bonds  without  obtaining voter  approval;  (ii)  whether  a
multi-year  lease-purchase  agreement  subject to  annual  appropriations  is an
obligation which requires voter  approval prior to  execution of the  agreement;
and (iii) what constitutes an "enterprise" which is excluded from the provisions
of  the  Amendment. In  September, 1994,  the Colorado  Supreme Court  held that
Districts can increase  mill levies to  pay debt service  on general  obligation
bonds  issued after  the effective date  of the  Amendment; litigation regarding
mill levy  increases  to  pay  general obligation  bonds  issued  prior  to  the
Amendment  is still pending.  In late 1994,  the Colorado Court  of Appeals held
that multi-year lease-purchase agreements subject to annual appropriation do not
require
    
 
                                       18
<PAGE>
   
voter approval. The time to file an  appeal in that case has expired. An  appeal
of  the  primary case  addressing  the remaining  issue  has been  heard  by the
Colorado Supreme Court; an opinion is expected by mid-1995. The outcome of  that
appeal cannot be predicted at this time.
    
 
   
    According  to the COLORADO ECONOMIC PERSPECTIVE, SECOND QUARTER, FY 1994-95,
DECEMBER 20,  1994 (the  "Economic Report"),  inflation for  1993 was  4.2%  and
population  grew  at  the  rate  of 2.9%  in  Colorado.  Accordingly,  under the
Amendment, increases in State expenditures during  the 1995 fiscal year will  be
limited  to 7.1% over  expenditures during the 1994  fiscal year. The limitation
for the 1996 fiscal year is projected  to be 6.9%, based on projected  inflation
of  4.4% for 1994 and projected population  growth of 2.5% during 1994. The 1994
fiscal year is the base year for calculating the limitation for the 1995  fiscal
year.  For the 1994 fiscal year, General Fund revenues totalled $3,596.1 million
and program revenues (cash funds) totalled $1,659.8 million, resulting in  total
estimated  base revenues of  $5,255.9 million. Expenditures  for the 1995 fiscal
year, therefore, cannot exceed $5,629.1  million. However, the 1995 fiscal  year
General Fund and program revenues (cash funds) are projected to be only $5,536.3
million,  or $92.8  million less  than expenditures  allowed under  the spending
limitation.
    
    There is also a statutory restriction  on the amount of annual increases  in
taxes  that  the  various  taxing jurisdictions  in  Colorado  can  levy without
electoral approval.  This restriction  does not  apply to  taxes levied  to  pay
general obligation debt.
 
   
    STATE  FINANCES.    As  the  State  experienced  revenue  shortfalls  in the
mid-1980s, it adopted various  measures, including impoundment  of funds by  the
Governor,  reduction  of appropriations  by  the General  Assembly,  a temporary
increase in the  sales tax, deferral  of certain tax  reductions and  inter-fund
borrowings. On a GAAP basis, the State had unrestricted General Fund balances at
June  30 of approximately $134.4 million in  fiscal year 1989, $116.6 million in
fiscal year 1990, $16.3  million in fiscal year  1991, $133.3 million in  fiscal
year  1992, $326.6 million in fiscal year 1993 and $320.4 million in fiscal year
1994. The fiscal year 1995 unrestricted General Fund ending balance is currently
projected to be $276.8 million.
    
   
    For fiscal year 1994, the  following tax categories generated the  following
percentages  of the  State's $3,596.1  million total  gross receipts: individual
income taxes represented 53.4% of gross  fiscal year 1994 receipts; sales,  use,
and other excise taxes represented 31.2% of gross fiscal year 1994 receipts; and
corporate  income taxes represented 4.1% of gross fiscal year 1994 receipts. The
final  budget  for  fiscal   year  1995  projects   General  Fund  revenues   of
approximately  $3,797.2  million  and appropriations  of  approximately $3,542.1
million. The percentages of  General Fund revenue generated  by type of tax  for
fiscal year 1995 are not expected to be significantly different from fiscal year
1994 percentages.
    
    STATE  DEBT.  Under its constitution, the State of Colorado is not permitted
to issue general obligation bonds  secured by the full  faith and credit of  the
State.  However,  certain  agencies  and  instrumentalities  of  the  State  are
authorized to  issue  bonds  secured  by revenues  from  specific  projects  and
activities.  The State enters into certain  lease transactions which are subject
to annual  renewal  at the  option  of the  State.  In addition,  the  State  is
authorized  to issue  short-term revenue anticipation  notes. Local governmental
units in the State are also  authorized to incur indebtedness. The major  source
of  financing for such  local government indebtedness is  an ad valorem property
tax. In addition, in order to finance public projects, local governments in  the
State  can  issue  revenue bonds  payable  from  the revenues  of  a  utility or
enterprise  or  from  the  proceeds  of  an  excise  tax,  or  assessment  bonds
 
                                       19
<PAGE>
payable  from special assessments.  Colorado local governments  can also finance
public projects through leases which are subject to annual appropriation at  the
option  of the  local government. Local  governments in Colorado  also issue tax
anticipation notes. The Amendment requires prior voter approval for the creation
of any  multiple fiscal  year  debt or  other financial  obligation  whatsoever,
except for refundings at a lower rate or obligations of an enterprise.
 
   
    STATE  ECONOMY.   Based  on estimates  published by  the State  of Colorado,
Office of State Planning and Budgeting as presented in the Economic Report, over
50% of non-agricultural employment in Colorado  in 1994 was concentrated in  the
retail  and wholesale  trade and service  sectors, reflecting  the importance of
tourism to  the  State's  economy and  of  Denver  as a  regional  economic  and
transportation  hub. The  government and  manufacturing sectors  followed as the
fourth  and  fifth  largest  employment  sectors  in  the  State,   representing
approximately 17.5% and 11%, respectively, of non-agricultural employment in the
State   in  1994.  The  Office  of   Planning  and  Budgeting  projects  similar
concentrations for 1995 and 1996.
    
   
    According to the  Economic Report, the  unemployment rate improved  slightly
from  an average  of 5.2% during  1993 to  4.9% during 1994.  Total retail sales
increased by 11.3%  during 1994. Colorado  continued to surpass  the job  growth
rate  of the U.S., with a 3.5% rate of growth estimated for Colorado in 1994, as
compared with 2.6% for the nation as a whole. However, the rate of job growth in
Colorado is expected to decline in 1995, primarily due to the completion in 1994
of large  public works  projects, such  as Denver  International Airport,  Coors
Baseball Field, and the Denver Public Library renovation project, the closure of
Lowry Air Force Base and cutbacks at Rocky Flats.
    
   
    Personal  income rose 7.4% in Colorado during  1993 and 7.1% in 1992. During
1994, personal  income rose  6.7% in  Colorado, as  compared with  5.9% for  the
nation as a whole.
    
    Economic  conditions  in  the State  may  have continuing  effects  on other
governmental units within the State (including issuers of the Colorado Bonds  in
the  Colorado Insured Trust),  which, to varying  degrees, have also experienced
reduced revenues as a result of recessionary conditions and other factors.
 
COLORADO 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.
 
                                       20
<PAGE>
 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      5.25%   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      19.5   %     6.52    6.83    7.14    7.45    7.76    8.07    8.39    8.70
    39.0- 94.3       0-114.7      31.5         7.66    8.03    8.39    8.76    9.12    9.49    9.85   10.22
                 114.7-172.1      32.5         7.78    8.15    8.52    8.89    9.26    9.63   10.00   10.37
    94.3-143.6       0-114.7      34.5         8.02    8.40    8.78    9.16    9.54    9.92   10.31   10.69
                 114.7-172.1      35.5         8.14    8.53    8.91    9.30    9.69   10.08   10.47   10.85
                 172.1-294.6      37.5         8.40    8.80    9.20    9.60   10.00   10.40   10.80   11.20
   143.6-256.5   114.7-172.1      40.0         8.75    9.17    9.58   10.00   10.42   10.83   11.25   11.67
                 172.1-294.6      43.0         9.21    9.65   10.09   10.53   10.96   11.40   11.84   12.28
                  Over 294.6      40.0   2     8.75    9.17    9.58   10.00   10.42   10.83   11.25   11.67
    Over 256.5   172.1-294.6      47.0         9.91   10.38   10.85   11.32   11.79   12.26   12.74   13.21
                  Over 294.6      44.0   3     9.38    9.82   10.27   10.71   11.16   11.61   12.05   12.50
</TABLE>
 
  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      5.25%   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      19.5   %     6.52    6.83    7.14    7.45    7.76    8.07    8.39    8.70
    23.4- 56.6       0-114.7      31.5         7.66    8.03    8.39    8.76    9.12    9.49    9.85   10.22
    56.6-118.0       0-114.7      34.5         8.02    8.40    8.78    9.16    9.54    9.92   10.31   10.69
                 114.7-237.2      36.0         8.20    8.59    8.98    9.38    9.77   10.16   10.55   10.94
   118.0-256.5   114.7-237.2      41.0         8.90    9.32    9.75   10.17   10.59   11.02   11.44   11.86
                  Over 237.2      40.0   2     8.75    9.17    9.58   10.00   10.42   10.83   11.25   11.67
    Over 256.5    Over 237.2      44.0   3     9.38    9.82   10.27   10.71   11.16   11.61   12.05   12.50
<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.
 
                                       21
<PAGE>
   
NUVEEN TAX-EXEMPT UNIT TRUST
SCHEDULE OF INVESTMENTS AT DATE OF DEPOSIT
FEBRUARY 17, 1995
COLORADO INSURED TRUST 56
(SERIES 785)
    
 
<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      Colorado Health Facilities Authority, Hospital      2004 at 102        AAA         Aaa     $       487,500
                   Revenue Improvement and Refunding Bonds
                   (Boulder Community Hospital Project), Series
                   1994B, 5.875% Due 10/1/23.
    525,000      Colorado Health Facilities Authority, Hospital      2003 at 102        AAA         Aaa             519,750
                   Revenue Bonds (North Colorado Medical
                   Center), Series 1993, 6.00% Due 5/15/20.
    500,000      Board of Trustees of the Colorado School of         2003 at 100        AAA         Aaa             444,060
                   Mines, Auxiliary Facilities, Refunding and
                   Improvement Revenue Bonds, Series 1993, 5.00%
                   Due 12/1/13.
    500,000      City of Colorado Springs, Colorado, Utilities       2004 at 100        AAA         Aaa             434,240
                   System Improvement and Refunding Revenue
                   Bonds, Series 1994A, 5.125% Due 11/15/23.
    500,000      Douglas County School District, Number RE.1,        2004 at 101        AAA         Aaa             519,640
                   Douglas and Elbert Counties, Colorado,
                   General Obligation Improvement Bonds, Series
                   1994A, 6.50% Due 12/15/16.
    475,000      Platte River Power Authority, Colorado, Power       2002 at 102        AAA         Aaa             445,360
                   Revenue Bonds, Series BB, 5.50% Due 6/1/18.
                   (Original issue discount bonds delivered on
                   or about December 3, 1992 at a price of
                   89.564% of principal amount.)
    500,000      Commonwealth of Puerto Rico, Public Improvement   2004 at 101 1/2      AAA         Aaa             516,185
                   Bonds of 1994 (General Obligation Bonds),
                   6.50% Due 7/1/23.
- -----------                                                                                                 ---------------
$ 3,500,000                                                                                                 $     3,366,735
- -----------                                                                                                 ---------------
- -----------                                                                                                 ---------------
</TABLE>
 
See Notes to Schedules of Investments, page 68.
 
                                       22
<PAGE>
   
MASSACHUSETTS INSURED TRUST 123
    
   
    The  Portfolio of Massachusetts Insured Trust  123 consists of 6 obligations
issued by entities  located in  Massachusetts 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: Electrical System Revenue, 1; Health Care Facility
Revenue, 2; Multi-Family Housing Revenue, 1; 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.
    
 
   
    At  the  Date  of  Deposit,  the  average  maturity  of  the  Bonds  in  the
Massachusetts Insured Trust is 23.7 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 26.8% 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 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  on February  14,
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>
  $3,256,226       $19,455           $198,270      $3,259,462                 .46%
</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 Massachusetts Insured Trust, less estimated expenses, is estimated to accrue
at the  rate  of  $.01526  per  Unit per  day  under  the  semi-annual  plan  of
distribution,  $.01521 per Unit per day under the quarterly plan of distribution
and $.01512 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
    
 
                                       23
<PAGE>
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  Massachusetts 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
MASSACHUSETTS 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.............  $   .6652(1)                                              $  5.4446
                                                        --------  $.4536 every month  --------
Quarterly Distribution Plan...........  $   .6652(1)   $   .4563(2)   $  1.3689      $  1.3689    $  5.4766
Semi-Annual Distribution Plan.........  $   .6652(1)   $   .4578(3)                  $  2.7468    $  5.4956
- ----------------------------------------------------------------------------------------------------------------
<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--MASSACHUSETTS INSURED TRUST
 
    For a discussion of the Federal tax status of income earned on Massachusetts
Insured Trust Units, see Section 11.
 
    In the opinion  of Edwards &  Angell, special Massachusetts  counsel to  the
Trust, based on rulings by the Commissioner of Revenue and under existing law:
 
        For  Massachusetts income tax purposes, each  Trust will be treated as a
    corporate trust under Section 8 of  Chapter 62 of the Massachusetts  General
    Laws  ("M.G.L.") and not  as a grantor  trust under Section  10(e) of M.G.L.
    Chapter 62.
 
        The Trust will not be held  to be engaging in business in  Massachusetts
    within  the meaning of said Section 8 and will, therefore, not be subject to
    Massachusetts income tax.
 
        Unitholders who  are  subject  to Massachusetts  income  taxation  under
    M.G.L. Chapter 62 will not be required to include their respective shares of
    the  earnings of  or distributions from  the Massachusetts  Insured Trust in
    their Massachusetts  gross  income  to  the extent  that  such  earnings  or
    distributions represent tax-exempt interest excludable from gross income for
    Federal  income tax purposes received by  the Massachusetts Insured Trust on
    obligations  issued   by   Massachusetts,  its   counties,   municipalities,
    authorities,  political subdivisions or instrumentalities or by Puerto Rico,
    the Virgin Islands, Guam, the Northern Mariana Islands or other  possessions
    of  the United States within  the meaning of Section  103(c) of the Internal
    Revenue Code of 1986, as amended ("Massachusetts Obligations").
 
        In the  case  of a  Massachusetts  Insured Trust,  Unitholders  who  are
    subject to Massachusetts income taxation under M.G.L. Chapter 62 will not be
    required to include their
 
                                       24
<PAGE>
    respective  shares of  the earnings of  or distributions from  such Trust in
    their Massachusetts  gross  income  to  the extent  that  such  earnings  or
    distributions  are derived  from the proceeds  of insurance  obtained by the
    Sponsor of such Trust or by the issuer or underwriter of an obligation  held
    by such Trust that represent maturing interest on defaulted obligations held
    by   the  Trustee,  if  and  to  the  same  extent  that  such  earnings  or
    distributions would  have been  excludable  from the  gross income  of  such
    Unitholders  if derived  from interest paid  by the issuer  of the defaulted
    obligation.
 
        Unitholders which  are corporations  subject  to taxation  under  M.G.L.
    Chapter  63  will be  required  to include  their  respective shares  of the
    earnings of or  distributions from  the Trust in  their Massachusetts  gross
    income  to the extent that such earnings or distributions represent interest
    from bonds, notes  or indebtedness  of any  state, including  Massachusetts,
    except for interest which is specifically exempted from such tax by the acts
    authorizing issuance of said Massachusetts Obligations.
 
        The  Massachusetts Insured  Trust's capital gains  and/or capital losses
    which are includable  in the  Federal gross  income of  Unitholders who  are
    subject  to  Massachusetts  income  taxation  under  M.G.L.  Chapter  62, or
    Unitholders which are corporations  subject to Massachusetts taxation  under
    M.G.L.  Chapter 63 will  be included as  capital gains and/or  losses in the
    Unitholders' Massachusetts gross  income, except for  capital gain which  is
    specifically  exempted  from  taxation  under  such  Chapters  by  the  acts
    authorizing issuance of said Massachusetts Obligations.
 
        Unitholders which are corporations subject  to tax under M.G.L.  Chapter
    63  and which  are tangible  property corporations  will not  be required to
    include the Units  when determining  the value of  their tangible  property.
    Unitholders  which are intangible property  corporations will be required to
    include the Units when determining their net worth.
 
        Gains or losses realized on sales or redemptions of Units by Unitholders
    who are subject to Massachusetts income taxation under M.G.L. Chapter 62, or
    Unitholders which are corporations subject to Massachusetts income  taxation
    under  M.G.L. Chapter  63, will be  includable in  their Massachusetts gross
    income. In  determining such  gain or  loss Unitholders  will, to  the  same
    extent required for Federal tax purposes, have to adjust their tax bases for
    their  Units  for  accrued  interest  received,  if  any,  on  Massachusetts
    Obligations delivered to  the Trustee  after the Unitholders  pay for  their
    Units,  for amortization of  premiums, if any,  on Massachusetts Obligations
    held by  the Massachusetts  Insured Trust,  and for  accrued original  issue
    discount  with respect to  each Massachusetts Obligation  which, at the time
    the Massachusetts Obligation was issued, had original issue discount.
 
        The Units of the  Trust are not  subject to any  property tax levied  by
    Massachusetts  or any political  subdivision thereof, nor  to any income tax
    levied by any such political subdivision.  They are includable in the  gross
    estate  of a deceased holder who is a resident of Massachusetts for purposes
    of the Massachusetts Estate Tax.
 
ECONOMIC FACTORS--MASSACHUSETTS
 
    Without intending  to  be complete,  the  following briefly  summarizes  the
current  financial situation, as  well as some of  the complex factors affecting
the  financial   situation,   in   the  Commonwealth   of   Massachusetts   (the
"COMMONWEALTH").  It is  derived from  sources that  are generally  available to
investors and is based in part on information obtained from various agencies  in
Massachusetts.  No independent  verification has  been made  of the  accuracy or
completeness of the following information.
 
                                       25
<PAGE>
    There can  be no  assurance that  current or  future statewide  or  regional
economic  difficulties,  and  the  resulting  impact  on  Commonwealth  or local
governmental finances generally, will not  adversely affect the market value  of
Massachusetts  Obligations in the Trust or the ability of particular obligors to
make timely payments of debt service on (or relating to) those obligations.
 
    Since 1988,  there has  been a  significant slowdown  in the  Commonwealth's
economy,  as indicated by  a rise in  unemployment, a slowing  of its per capita
income growth and declining state  revenues. In fiscal 1991, the  Commonwealth's
expenditures  for  state  government  programs  exceeded  current  revenues, and
although fiscal 1992, 1993 and 1994 revenues exceeded expenditures, no assurance
can be given that lower than expected tax revenues will not resume and continue.
 
    1995 FISCAL  YEAR  BUDGET.   On  July  10,  1994, the  Governor  signed  the
Commonwealth's  budget  for fiscal  1995.  The fiscal  1995  budget is  based on
estimated budgeted revenues and other sources of approximately $16.364  billion,
which  includes  tax revenue  estimates  of approximately  $11.234  billion. Tax
revenues for fiscal 1995  were originally estimated at  $11.328 billion in  May,
1994,  however, due to the slowing of the  rate of growth in certain tax revenue
categories in  the months  following  the signing  of the  budget,  particularly
income  tax,  the Secretary  of  the Administration  on  September 26,  1994, as
required by law, reduced  the fiscal 1995 tax  revenue estimate by $75  million.
The  tax  revenue estimate  includes $19.3  million  of tax  cuts signed  by the
Governor in  the fiscal  1995 budget.  Estimated fiscal  1995 tax  revenues  are
approximately  $627  million higher  than fiscal  1994  tax revenues  of $10.607
billion.
 
    As signed  by  the Governor,  the  budget authorizes  approximately  $16.482
billion  in fiscal  1995 expenditures. The  Governor exercised  his authority to
veto and  reduce  individual  line  items  and  reduced  total  expenditures  by
approximately  $298.2 million and vetoed certain  other law changes contained in
the fiscal 1995 budget. The $16.482 billion of fiscal 1995 expenditures includes
a reserve  against  certain contingencies  currently  in the  amount  of  $102.7
million.  On October  7, 1994, the  Governor filed  a supplemental appropriation
recommendation aggregating approximately $44.5  million, which expenditures  are
included in the $102.7 million contingency reserve for fiscal 1995 expenditures.
 
    The  fiscal 1995 budget is based  on numerous spending and revenue estimates
the achievement of which cannot be assured.
 
    On November 8, 1994, the voters  in the statewide general election  approved
an  initiative petition that would slightly increase the portion of the gasoline
tax revenue credited to the Highway Fund, one of the Commonwealth's three  major
budgetary  funds, prohibit the transfer of money  from the Highway Fund to other
funds for non-highway purposes and not permit including the Highway Fund balance
in the  computation "consolidated  net surplus"  for purposes  of state  finance
laws.  The initiative petition also  provides that no more  than 15% of gasoline
tax revenues may be used for mass transportation purposes, such as  expenditures
related  to the  Massachusetts Bay  Transit Authority.  The Executive  Office of
Administration and  Finance is  analyzing the  effect, if  any, this  initiative
petition,  which became  law on December  8, 1994,  may have on  the fiscal 1995
budget and  it currently  does not  expect  it to  have any  materially  adverse
impact.  This is not a  constitutional amendment and is  subject to amendment or
repeal by the  Legislature, which  may also,  notwithstanding the  terms of  the
petition,  appropriate moneys from the Highway Fund in such amounts and for such
purposes as it  determines, subject  only to a  constitutional restriction  that
such moneys be used for highways or mass transit purposes.
 
                                       26
<PAGE>
    1994  FISCAL YEAR.  The Commonwealth is in the process of closing its fiscal
1994 financial records. Financial information  for fiscal 1994 is unaudited  and
provided  by the office of the  Comptroller based upon the Preliminary Financial
Report of  the  Commonwealth  for  fiscal 1994  issued  by  the  Comptroller  on
September 15, 1994. Audited financial information is expected to be published in
January, 1995.
 
    Fiscal  1994 tax revenue collections were approximately $10.607 billion, $87
million below the Department of Revenue's fiscal year 1994 tax revenue  estimate
of  $10.694 billion and  $677 million above  fiscal 1993 tax  revenues of $9.930
billion. Budgeted  revenues  and  other  sources,  including  non-tax  revenues,
collected   in  fiscal   1994  were  approximately   $15.551  billion.  Budgeted
expenditures and other uses of funds  in fiscal 1994 were approximately  $15.533
billion.
 
    As  of June 30,  1994, the Commonwealth  showed a year-end  cash position of
approximately $757 million, as compared to a projected position of $599 million.
 
    In June, 1993,  the Legislature  adopted and  the Governor  signed into  law
comprehensive   education  reform  legislation.  This  legislation  required  an
increase in expenditures for education purposes above fiscal 1993 base  spending
of  $1.288 billion of  approximately $175 million in  fiscal 1994. The Executive
Office  for  Administration  and  Finance   expects  the  annual  increases   in
expenditures  above  the  fiscal 1993  base  spending  of $1.288  billion  to be
approximately $396 million in fiscal 1995, $632 million in fiscal 1996 and  $875
million  in fiscal 1997. Additional annual  increases are also expected in later
fiscal years. The  fiscal 1995 budget  as signed by  the Governor includes  $396
million in appropriations to satisfy this legislation.
 
    1993  FISCAL YEAR.  The Commonwealth's  budgeted expenditures and other uses
were approximately $14.696 billion in fiscal 1993, which is approximately $1.280
billion or  9.6% higher  than fiscal  1992 expenditures  and other  uses.  Final
fiscal  1993 budgeted expenditures were $23  million lower than the initial July
1992 estimates of fiscal 1993 budgeted expenditures. Budgeted revenues and other
sources for fiscal  1993 totalled approximately  $14.710 billion, including  tax
revenues  of  $9.930  billion. Total  revenues  and other  sources  increased by
approximately 6.9% from fiscal 1992 to fiscal 1993, while tax revenues increased
by 4.7%  for the  same period.  Overall, fiscal  1993 ended  with a  surplus  of
revenues and other sources over expenditures and other uses of $13.1 million and
aggregate   ending  fund  balances  in  the  budgeted  operating  funds  of  the
Commonwealth of  approximately $562.5  million.  After payment  in full  of  the
distribution  of local aid to the  Commonwealth's cities and towns ("Local Aid")
and the retirement of short term debt,  the Commonwealth showed a year end  cash
position of approximately $622.2 million, as compared to a projected position of
$485.1 million.
 
    1992  FISCAL YEAR.  The Commonwealth's  budgeted expenditures and other uses
were approximately $13.4 billion in fiscal 1992, which is $238.7 million or 1.7%
lower than  fiscal  1991  budgeted  expenditures.  Final  fiscal  1992  budgeted
expenditures  were $300  million more  than the  initial July  1991 estimates of
budgetary expenditures,  due in  part  to increases  in certain  human  services
programs,  including an increase of $268.7  million for the Medicaid program and
$50.0 million  for  mental  retardation consent  decree  requirements.  Budgeted
revenues  and other sources for fiscal 1992 totalled approximately $13.7 billion
(including tax revenues of approximately  $9.5 billion), reflecting an  increase
of  approximately 0.7% from fiscal  1991 to 1992 and an  increase of 5.4% in tax
revenues for the same  period. Overall, fiscal 1992  is estimated to have  ended
with an excess of revenues and other sources over expenditures and other uses of
$312.3    million.   After   payment    in   full   of    Local   Aid   in   the
 
                                       27
<PAGE>
amount of $514.0 million due on June 30, 1992, retirement of the  Commonwealth's
outstanding  commercial  paper (except  for  approximately $50  million  of bond
anticipation notes) and  certain other  short term  borrowings, as  of June  30,
1992,  the end of fiscal 1992, the  Commonwealth showed a year-end cash position
of approximately $731 million, as compared with the Commonwealth's cash  balance
of $182.3 million at the end of fiscal 1991.
 
    1991  FISCAL YEAR.  Budgeted expenditures for fiscal 1991 were approximately
$13.659 billion, as against budgeted revenues and other sources of approximately
$13.634 billion. The  Commonwealth suffered an  operating loss of  approximately
$21.2  million. Application of the adjusted  fiscal 1990 fund balances of $258.3
million resulted in a fiscal 1991 budgetary surplus of $237.1 million. State law
requires that approximately $59.2 million of the fiscal year ending balances  of
$237.1  million be placed in the Stabilization  Fund, a reserve from which funds
can be appropriated (i) to make up any difference between actual state  revenues
in  any fiscal year  in which actual  revenues fall below  the allowable amount,
(ii) to replace state and local losses by federal funds or (iii) for any  event,
as  determined by the legislature, which threatens the health, safety or welfare
of the  people  or the  fiscal  stability of  the  Commonwealth or  any  of  its
political subdivisions.
 
    Upon  taking office in January  1991, the new Governor  proposed a series of
legislative and  administrative  actions, including  withholding  of  allotments
under  Section 9C of Chapter  29 of the General  Laws, intended to eliminate the
projected deficits.  The  new Governor's  review  of the  Commonwealth's  budget
indicated  projected spending of  approximately $14.1 billion  with an estimated
$850 million in  budget balancing  measures that would  be needed  prior to  the
close  of fiscal  1991. At  that time,  estimated tax  revenues were  revised to
approximately $8.8 billion, $903 million less than was estimated at the time the
fiscal 1991  budget  was  adopted.  The Legislature  adopted  a  number  of  the
Governor's  recommendations and the Governor took certain administrative actions
not requiring legislative approval, including  the adoption of a state  employee
furlough  program. It is estimated by  the Commonwealth that spending reductions
achieved  through  savings  initiatives  and  withholding  of  allotments  total
approximately  $484.3  million  in  aggregate for  fiscal  1991.  However, these
savings and reductions may be impacted negatively by litigation pursued by third
parties concerning the Governor's actions under Section 9C of Chapter 29 of  the
General Laws and with regard to the state employee furlough program.
 
    In  addition, the new administration  in May 1991 filed  an amendment to its
Medicaid state  plan that  enables  it to  claim  50% federal  reimbursement  on
uncompensated  care payments  for certain  hospitals in  the Commonwealth.  As a
result, in fiscal 1991, the Commonwealth obtained additional non-tax revenues in
the form  of  federal reimbursements  equal  to approximately  $513  million  on
account  of uncompensated care payments. This reimbursement claim was based upon
recent amendments of federal law contained in the Omnibus Budget  Reconciliation
Act   of  1990  and,  consequently,  on  relatively  undeveloped  federal  laws,
regulations and guidelines. At the request of the federal Health Care  Financing
Administration,  the Office of Inspector General of the United States Department
of Health and Human  Services has commenced an  audit of the reimbursement.  The
administration,  which had  reviewed the matter  with the  Health Care Financing
Administration  prior  to   claiming  the  reimbursement,   believes  that   the
Commonwealth  will prevail in  the audit. If the  Commonwealth does not prevail,
the Commonwealth  would  have the  right  to contest  an  appeal, but  could  be
required to pay all or part of Medicaid reimbursements with interest and to have
such amount deducted from future reimbursement payments.
 
    1990  AND  1989 FISCAL  YEARS.   In  July 1989,  the former  Governor vetoed
certain provisions included in the budget legislation for fiscal 1990, including
approximately $273 million  of the  fiscal 1990  appropriations, including  $100
million for Local Aid. One of the
 
                                       28
<PAGE>
Governor's  vetoes occasioned  a default by  the Commonwealth on  a September 1,
1989 payment  of  $2.5  million  on  a  general  obligation  contract  with  the
Massachusetts  Community Development Finance Corporation to which its full faith
and credit had been pledged, which payment was made on September 17, 1990  after
a  supplemental appropriation  was proposed  by the  Governor and  passed by the
legislature. The legislature  overrode the  Governor's veto of  $100 million  of
Local  Aid and the Governor then indicated that he was withholding the allotment
for such  expenditure. The  Supreme Judicial  Court invalidated  the  Governor's
withholding of $210 million of appropriated funds for certain Local Aid purposes
in May 1990.
 
    Budgeted  expenditures for fiscal 1989 and 1990 totalled approximately $12.6
billion and $13.3 billion, respectively.  Budgeted revenues for fiscal 1989  and
1990 totalled approximately $12.0 billion and $12.0 billion, respectively.
 
    EMPLOYMENT.   Reversing  a trend of  relatively low  unemployment during the
early and  mid 1980's,  the Massachusetts  unemployment rate  beginning in  1990
increased  significantly to where the  Commonwealth's unemployment rate exceeded
the national unemployment rate. During 1990, the Massachusetts unemployment rate
increased from 4.5% in January to 6.1%  in July to 6.7% in August. During  1991,
the  Massachusetts  unemployment rate  averaged  9.0% while  the  average United
States unemployment rate  was 6.7%. The  Massachusetts unemployment rate  during
1992  averaged 8.5% while the average  United States unemployment rate was 7.4%.
Since 1993, the  average monthly  unemployment rate has  declined steadily.  The
Massachusetts  unemployment rate in  August 1994 was 5.9%,  as compared with the
United States unemployment rate of 6.1% for the same period. Other factors which
may significantly and adversely affect  the employment rate in the  Commonwealth
include reductions in federal government spending on defense-related industries.
Due  to  this  and  other  considerations,  there  can  be  no  assurances  that
unemployment in the Commonwealth will not increase in the future.
 
    DEBT RATINGS.   S&P  currently rates  the Commonwealth's  uninsured  general
obligation  bonds at A+. At the same  time, S&P currently rates state and agency
notes at SP1. From 1989 through 1992, the Commonwealth had experienced a  steady
decline  in its  S&P rating, with  its decline  beginning in May  1989, when S&P
lowered its  rating on  the Commonwealth's  general obligation  bonds and  other
Commonwealth  obligations  from AA+  to AA  and continuing  a series  of further
reductions until March 1992, when the rating was affirmed at BBB.
 
    Moody's currently  rates  the Commonwealth's  uninsured  general  obligation
bonds  at A1. From 1989 through 1992,  the Commonwealth had experienced a steady
decline in its rating by  Moody's since May 1989.  In May 1989, Moody's  lowered
its  rating on the Commonwealth's  notes from MIG-1 to  MIG-2, and its rating on
the Commonwealth's commercial paper  from P-1 to P-2.  On June 21, 1989  Moody's
reduced  the Commonwealth's general obligation rating  from Aa to A. On November
15, 1989, Moody's reduced the  rating on the Commonwealth's general  obligations
from  A  to Baa1,  and  on March  9,  1990, Moody's  reduced  the rating  of the
Commonwealth's general  obligation bonds  from  Baa1 to  Baa.  There can  be  no
assurance that these ratings will continue.
 
    In  recent  years, the  Commonwealth and  certain of  its public  bodies and
municipalities have faced serious financial difficulties which have affected the
credit standing  and borrowing  abilities of  Massachusetts and  its  respective
entities  and may have contributed to higher interest rates on debt obligations.
The continuation of, or an increase in, such financial difficulties could result
in declines  in  the market  values  of,  or default  on,  existing  obligations
including  Massachusetts Obligations  in the Trust.  Should there  be during the
term of  the Trust  a financial  crisis relating  to Massachusetts,  its  public
bodies or municipalities, the
 
                                       29
<PAGE>
market   value  and  marketability  of  all  outstanding  bonds  issued  by  the
Commonwealth  and  its  public  authorities  or  municipalities  including   the
Massachusetts Obligations in the Trust and interest income to the Trust could be
adversely affected.
 
    TOTAL  BOND  AND  NOTE  LIABILITIES.    The  total  general  obligation bond
indebtedness of the Commonwealth (including Fiscal Recovery Bonds) as of October
1,  1994  was   approximately  $9.1   billion.  There   were  also   outstanding
approximately  $289 million  in general  obligation notes  and other  short term
general obligation debt. The total bond and note liabilities of the Commonwealth
as of October 1, 1994, including guaranteed bond and contingent liabilities, was
approximately $12.8 billion.
 
    DEBT SERVICE.    During  the  1980s,  capital  expenditures  were  increased
substantially,  which  has had  a short  term impact  on the  cash needs  of the
Commonwealth and also  accounts for a  significant rise in  debt service  during
that  period. Payments for debt service on Commonwealth general obligation bonds
and notes have risen at an average  annual rate of 22.2% from $770.9 million  in
fiscal 1990 to an estimated $942.3 million in fiscal 1991. Debt service payments
in  fiscal  1992 were  $898.3  million. Debt  service  payments for  fiscal 1992
reflect a $261 million one-time reduction  achieved as a result of the  issuance
of  the refunding bonds in September and October 1991. Debt service expenditures
were approximately $1.140 billion and $1.155  billion for fiscal 1993 and  1994,
respectively,  and are projected  to be approximately  $1.249 billion for fiscal
1995. The fiscal 1993 and fiscal 1994 debt service expenditures reflect  savings
of  $62.9 million and $57.3 million, respectively, achieved through the issuance
of refunding bonds in October 1992, and March, May and August 1993. The  amounts
represented  do not include debt  service on notes issued  to finance the fiscal
1989 deficit  and certain  Medicaid related  liabilities, certain  debt  service
contract  assistance to  the Massachusetts Bay  Transportation Authority ($181.9
million projected in fiscal 1995), the Massachusetts Convention Center Authority
($24.6 million projected in fiscal 1995), the Massachusetts Government Land Bank
($6.0 million projected in  fiscal 1995) and  the Massachusetts Water  Pollution
Abatement  Trust ($13.9 million projected in fiscal  1995), as well as grants to
municipalities under the school building assistance program to defray a  portion
of  the debt service  costs on local  school bonds ($179.2  million projected in
fiscal 1995).
 
    In January 1990, legislation  was passed to impose  a limit on debt  service
beginning  in  fiscal  1991,  providing  that no  more  than  10%  of  the total
appropriations in any fiscal  year may be expended  for payment of interest  and
principal  on general obligation debt (excluding the Fiscal Recovery Bonds). The
percentage of total  appropriations expended from  the budgeted operating  funds
for  debt service (excluding  debt service on Fiscal  Recovery Bonds) for fiscal
1994 is 5.7% (on a preliminary  unaudited basis) which is projected to  increase
to 5.9% in fiscal 1995.
 
    CERTAIN   LIABILITIES.    Among  the  material  future  liabilities  of  the
Commonwealth are  significant unfunded  general  liabilities of  its  retirement
systems  and a program to fund such  liabilities; a program whereby, starting in
1978, the  Commonwealth began  assuming full  financial responsibility  for  all
costs  of  the administration  of  justice within  the  Commonwealth; continuing
demands to raise aggregate aid to cities, towns, schools and other districts and
transit authorities above current levels;  and Medicaid expenditures which  have
increased each year since the program was initiated. The Commonwealth has signed
consent  decrees to continue  improving mental health care  and programs for the
mentally retarded in order to meet federal standards, including those  governing
receipt  of federal  reimbursements under various  programs, and  the parties in
those cases have worked cooperatively to resolve the disputed issues.
 
                                       30
<PAGE>
    As a  result of  comprehensive legislation  approved in  January, 1988,  the
Commonwealth  is  required,  beginning in  fiscal  1989 to  fund  future pension
liabilities currently and  to amortize the  Commonwealth's unfunded  liabilities
over  40 years. The  estimated pension costs (inclusive  of current benefits and
pension reserves)  for fiscal  year  1993 are  $873.8 million,  representing  an
increase of 16.2% over fiscal 1992 expenditures.
 
    LITIGATION.    The Commonwealth  is  engaged in  various  lawsuits involving
environmental and related  laws, including an  action brought on  behalf of  the
U.S.  Environmental Protection Agency alleging violations of the Clean Water Act
and seeking to  enforce the clean-up  of Boston Harbor.  The MWRA, successor  in
liability   to  the  Metropolitan  District   Commission,  has  assumed  primary
responsibility for developing  and implementing  a court-approved  plan for  the
construction  of the treatment  facilities necessary to  achieve compliance with
federal requirements. Under the Clean Water Act, the Commonwealth may be  liable
for costs of compliance in these or any other Clean Water cases if the MWRA or a
municipality  is  prevented from  raising revenues  necessary  to comply  with a
judgment. The MWRA currently projects that the total cost of construction of the
treatment facilities  required under  the court's  order is  approximately  $3.5
billion  in current dollars, with approximately $1.78  billion to be spent on or
after January 1, 1994.
 
    The Department of  Public Welfare  has been  sued for  the alleged  unlawful
denial  of  personal  care  attendant  services  to  certain  disabled  Medicaid
recipients. The Superior Court has denied the plaintiff's motion for preliminary
injunction and has also denied  the plaintiff's motion for class  certification.
If  the plaintiffs  were to  prevail on their  claims and  the Commonwealth were
required to  provide  all  of the  services  sought  by the  plaintiffs  to  all
similarly  situation persons, it would substantially increase in the annual cost
to the  Commonwealth  that these  services  might eventually  be  required.  The
Department  of Public Welfare currently estimates this increase to be as much as
$200 million per year.
 
    There are  also  actions  pending  in which  recipients  of  human  services
benefits,  such as welfare  recipients, the mentally  retarded, the elderly, the
handicapped, children, residents of state  hospitals and inmates of  corrections
institutions,  seek  expanded  levels  of services  and  benefits  and  in which
providers of services to such recipients  challenge the rates at which they  are
reimbursed  by  the Commonwealth.  To  the extent  that  such actions  result in
judgments requiring the Commonwealth to provide expanded services or benefits or
pay increased  rates, additional  operating and  capital expenditures  might  be
needed to implement such judgments.
 
    The  Massachusetts Hospital Association has brought an action challenging an
element of the Medicaid rate setting methodologies for hospitals. On October 12,
1993, the  case  was  settled  with the  hospital  association  and  most  acute
hospitals,  thereby  reducing  the  Commonwealth's  potential  liability  in the
pending case or in related appeals to approximately $10 million.
 
    In addition there are several tax  matters in litigation which could  result
in significant refunds to taxpayers if decisions unfavorable to the Commonwealth
are rendered. In BAYBANK, ET AL. V. COMMISSIONER OF REVENUE, the banks challenge
the  inclusion of income from tax exempt  obligations in the measure of the bank
excise tax. The  Appellate Tax Board  issued findings  of fact and  a report  in
favor  of the Commissioner of Revenue on September 30, 1993. The case is pending
before the Supreme Judicial  Court and is  expected to be  heard in March  1995.
Taking  into account all banks and all years at issue (1974 through 1986), there
are 142 appeals consolidated in this case.  The amount at issue is estimated  to
be  approximately $1.2 billion, which  amount includes interest of approximately
$900 million
 
                                       31
<PAGE>
and amounts involved in  other related applications  for abatement pending  with
the Commissioner of Revenue or with the Appellate Tax Board. The amount of taxes
and interest at issue in other cases is approximately $150 million.
 
    In  NATIONAL  ASSOCIATION  OF  GOVERNMENT  EMPLOYEES  V.  COMMONWEALTH,  the
Superior  Court  declared  that  a  line  item  in  the  Commonwealth's  general
appropriations   act  for  fiscal  1994  that  increased  the  state  employees'
percentage share  of their  group  health insurance  premiums  from 10%  to  15%
violated  the terms of  several collective bargaining  agreements, and therefore
was invalid under the United States Constitution as regards employees covered by
the agreements. The Commonwealth appealed the Superior Court's decision and  the
Supreme Judicial Court has granted direct appellate review. Several other unions
have  filed  a  companion suit  asserting  that the  premium  increase similarly
violated other  collective bargaining  agreements.  The latter  suit is  in  its
initial  stages. If the Superior Court decision  in favor of the state employees
is  upheld,  the   Commonwealth's  aggregate  liability   is  estimated  to   be
approximately $32 million.
 
    A  variety of  other civil suits  pending against the  Commonwealth may also
affect its future  liabilities. These include  challenges to the  Commonwealth's
allocation  of school aid under Section 9C of Chapter 29 of the General Laws and
to adopt a state employee furlough program. No prediction is possible as to  the
ultimate outcome of these proceedings.
 
    Many  factors, in addition  to those cited  above, do or  may have a bearing
upon the financial condition of the Commonwealth, including social and  economic
conditions, many of which are not within the control of the Commonwealth.
 
    EXPENDITURE  AND TAX LIMITATION  MEASURES.  Limits  have been established on
state tax revenues by legislation approved  by the Governor on October 25,  1986
and  by an initiative petition  approved by the voters  on November 4, 1986. The
Executive Office for Administration and  Finance currently estimates that  state
tax  revenues will not reach the limit imposed by either the initiative petition
or the legislative enactment in fiscal 1992.
 
    Proposition 2 1/2, passed by the voters in 1980, led to large reductions  in
property  taxes, the  major source  of income  for cities  and towns,  and large
increases in state aid to offset such revenue losses. According to the Executive
Office for Administration and Finance, all of the 351 cities and towns have  now
achieved  a property  tax level of  no more  than 2.5% of  full property values.
Under the terms of Proposition 2 1/2, the property tax levy can now be increased
annually for all cities and towns, almost all by 2.5% of the prior fiscal year's
tax  levy  plus  2.5%  of  the  value  of  new  properties  and  of  significant
improvements  to  property.  Legislation  has also  been  enacted  providing for
certain local  option  taxes.  A  voter  initiative  petition  approved  at  the
statewide  general election in November, 1990 further regulates the distribution
of Local Aid of no  less than 40% of  collections from individual income  taxes,
sales  and  use taxes,  corporate excise  taxes,  and the  balance of  the state
lottery  fund.  If   implemented  in  accordance   with  its  terms   (including
appropriation  of the  necessary funds),  the petition  as approved  would shift
several hundred million dollars to direct Local Aid.
 
    OTHER TAX MEASURES.   To provide  revenue to  pay debt service  on both  the
deficit  and  Medicaid-related borrowings  and to  fund certain  direct Medicaid
expenditures, legislation  was enacted  imposing an  additional tax  on  certain
types  of personal income for 1989 and 1990 taxable years at rates of 0.375% and
0.75% respectively, effectively raising the tax  rate of 1989 from 5% to  5.375%
and  for 1990 to 5.75%. Recent legislation has effectively further increased tax
rates to 5.95% for  tax year 1990 to  6.25% for tax year  1991 and returning  to
5.95%  for tax year 1992 and subsequent tax  years. The tax is applicable to all
personal  income   except  income   derived  from   dividends,  capital   gains,
unemployment  compensation,  alimony,  rent, interest,  pensions,  annuities and
IRA/Keogh distributions. The income tax
 
                                       32
<PAGE>
rate on other interest (excluding interest  on obligations of the United  States
and  of the Commonwealth and its  subdivisions), dividends and net capital gains
(after a 50%  reduction) was increased  from 10% to  12% for tax  year 1990  and
subsequent years, by recently enacted legislation.
 
    ESTATE  TAX REVISIONS.   The fiscal  1993 budget  included legislation which
gradually phases out the current Massachusetts estate tax and replaces it with a
"sponge tax" in 1997.  The "sponge tax"  is based on the  maximum amount of  the
credit  for state taxes allowed for federal  estate tax purposes. The estate tax
is phased out  by means  of annual  increases in  the basic  exemption from  the
current  $200,000  level.  The  exemption is  increased  to  $300,000  for 1993,
$400,000 for 1994,  $500,000 for 1995  and $600,000 for  1996. In addition,  the
legislation  includes a full marital deduction  starting July 1, 1994. Currently
the marital deduction  is limited  to 50%  of the  Massachusetts adjusted  gross
estate.  The  static  fiscal impact  of  the phase  out  of the  estate  tax was
estimated to be approximately $24.8 million  in fiscal 1994 and is estimated  to
be approximately $72.5 million in fiscal 1995.
 
    OTHER  ISSUERS OF  MASSACHUSETTS OBLIGATIONS.   There are a  number of state
agencies, instrumentatlities and political subdivisions of the Commonwealth 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
obligations backed by the full faith  and credit of the Commonwealth. The  brief
summary above does not address, nor does it attempt to address, any difficulties
and   the  financial  situations   of  those  other   issuers  of  Massachusetts
Obligations.
 
MASSACHUSETTS 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.
 
                                       33
<PAGE>
 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      25.0   %     6.67    7.00    7.33    7.67    8.00    8.33    8.67    9.00
    39.0- 94.3       0-114.7      36.5         7.87    8.27    8.66    9.06    9.45    9.84   10.24   10.63
                 114.7-172.1      37.5         8.00    8.40    8.80    9.20    9.60   10.00   10.40   10.80
    94.3-143.6       0-114.7      39.5         8.26    8.68    9.09    9.50    9.92   10.33   10.74   11.16
                 114.7-172.1      40.0         8.33    8.75    9.17    9.58   10.00   10.42   10.83   11.25
                 172.1-294.6      42.0         8.70    9.13    9.57   10.00   10.43   10.87   11.30   11.74
   143.6-256.5   114.7-172.1      44.5         9.01    9.46    9.91   10.36   10.81   11.26   11.71   12.16
                 172.1-294.6      47.0         9.43    9.91   10.38   10.85   11.32   11.79   12.26   12.74
                  Over 294.6      44.5   2     9.01    9.46    9.91   10.36   10.81   11.26   11.71   12.16
    Over 256.5   172.1-294.6      50.5        10.10   10.61   11.11   11.62   12.12   12.63   13.13   13.64
                  Over 294.6      48.0   3     9.62   10.10   10.58   11.06   11.54   12.02   12.50   12.98
</TABLE>
 
  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 $     0-114.7      25.0   %     6.67    7.00    7.33    7.67    8.00    8.33    8.67    9.00
    23.4- 56.6       0-114.7      36.5         7.87    8.27    8.66    9.06    9.45    9.84   10.24   10.63
    56.6-118.0       0-114.7      39.5         8.26    8.68    9.09    9.50    9.92   10.33   10.74   11.16
                 114.7-237.2      40.5         8.40    8.82    9.24    9.66   10.08   10.50   10.92   11.34
   118.0-256.5   114.7-237.2      45.5         9.17    9.63   10.09   10.55   11.01   11.47   11.93   12.39
                  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      48.0   3     9.62   10.10   10.58   11.06   11.54   12.02   12.50   12.98
<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.
 
                                       34
<PAGE>
   
NUVEEN TAX-EXEMPT UNIT TRUST
SCHEDULE OF INVESTMENTS AT DATE OF DEPOSIT
FEBRUARY 17, 1995
MASSACHUSETTS INSURED TRUST 123
(SERIES 785)
    
 
<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      Massachusetts Health and Educational Facilities     2003 at 102        AAA         Aaa     $       475,580
                   Authority, Revenue Bonds, Falmouth Hospital
                   Issue, Series C, 5.625% Due 7/1/11.
    500,000      Massachusetts Health and Educational Facilities     2003 at 102        AAA         Aaa             442,170
                   Authority, Revenue Bonds, Lahey Clinic
                   Medical Center Issue, Series B, 5.375% Due
                   7/1/23. (Original issue discount bonds
                   delivered on or about April 27, 1993 at a
                   price of 94.511% of principal amount.)
    460,000      Massachusetts Housing Finance Agency, Housing       2004 at 102        AAA         Aaa             446,941
                   Revenue Refunding Bonds, 1994 Series A, 5.95%
                   Due 12/1/14.
    525,000      Massachusetts Municipal Wholesale Electric          2004 at 102        AAA         Aaa             453,852
                   Company, Power Supply System Revenue Bonds,
                   1994 Series B, 5.00% Due 7/1/13.
    515,000      Massachusetts Port Authority, Revenue Bonds,        2003 at 102        AAA         Aaa             504,643
                   Series 1992-B, 6.00% Due 7/1/23.
    500,000      Massachusetts Water Resources Authority,            2004 at 102        AAA         Aaa             436,310
                   General Revenue Bonds, 1993 Series C, 5.25%
                   Due 12/1/20. (Original issue discount bonds
                   delivered on or about December 2, 1993 at a
                   price of 92.784% of principal amount.)
    500,000      Commonwealth of Puerto Rico, Public Improvement   2004 at 101 1/2      AAA         Aaa             516,185
                   Bonds of 1994 (General Obligation Bonds),
                   6.50% Due 7/1/23.
- -----------                                                                                                 ---------------
$ 3,500,000                                                                                                 $     3,275,681
- -----------                                                                                                 ---------------
- -----------                                                                                                 ---------------
</TABLE>
 
See Notes to Schedules of Investments, page 68.
 
                                       35
<PAGE>
   
NEW JERSEY INSURED TRUST 187
    
   
    The  Portfolio of  New Jersey  Insured Trust  187 consists  of 7 obligations
issued by entities located in New Jersey and one obligation issued by an  entity
located  in the  Territory of Puerto  Rico. Two  Bonds in the  Trust are general
obligations of the  governmental entities  issuing them  and are  backed by  the
taxing  powers 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: Electrical System Revenue, 1; Health Care Facility
Revenue, 1; Industrial Revenue, 1; Transportation Facility Revenue, 1; Municipal
Lease Revenue, 1; Miscellaneous 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.
    
 
   
    At the Date of Deposit, the average maturity of the Bonds in the New  Jersey
Insured  Trust is 26.2  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.
    
 
    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 15,
1995  and February 16, 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>
  $3,337,946       $17,830           $204,070      $3,338,901                 .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 New Jersey Insured Trust, less estimated expenses, is estimated to accrue at
the rate of $.01571 per Unit per day under the semi-annual plan of distribution,
$.01566 per Unit per  day under the quarterly  plan of distribution and  $.01557
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 New Jersey Insured  Trust
under  the various plans appear in the  following table based upon estimated Net
Annual Interest Income at the Date of Deposit:
 
                                       36
<PAGE>
 
<TABLE>
<CAPTION>
                                                                                                      NORMAL
                                                                                                  DISTRIBUTIONS
NEW JERSEY 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.............  $   .6850(1)                                              $  5.6056
                                                        --------  $.4671 every month  --------
Quarterly Distribution Plan...........  $   .6850(1)   $   .4698(2)   $  1.4094      $  1.4094    $  5.6376
Semi-Annual Distribution Plan.........  $   .6850(1)   $   .4713(3)                  $  2.8278    $  5.6566
- ----------------------------------------------------------------------------------------------------------------
<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--NEW JERSEY INSURED TRUST
 
    For a discussion of the  Federal tax status of  income earned on New  Jersey
Insured Trust Units, see Section 11.
 
    The  assets of the New Jersey Insured Trust will consist of interest-bearing
obligations issued by  or on behalf  of the  State of New  Jersey and  counties,
municipalities,  authorities  and  other  political  subdivisions  thereof,  and
certain territories  of the  United  States, including  Puerto Rico,  Guam,  the
Virgin Islands and the Northern Mariana Islands (the "New Jersey Bonds").
 
    In  the opinion  of Pitney,  Hardin, Kipp  & Szuch,  special counsel  to the
Series for New Jersey tax matters, under existing law:
 
        The New Jersey Insured Trust  will be recognized as  a Trust and not  an
    association  taxable as a corporation. The New Jersey Insured Trust will not
    be subject to  the New  Jersey Corporation Business  Tax or  the New  Jersey
    Corporation Income Tax.
 
        With  respect to the non-corporate Unitholders  who are residents of New
    Jersey, the income of the  New Jersey Insured Trust  will be treated as  the
    income  of such Unitholders under the  New Jersey Gross Income Tax. Interest
    on the underlying New Jersey  Bonds which is exempt  from tax under the  New
    Jersey  Gross Income Tax Law  when received by the  New Jersey Insured Trust
    will retain  its  status as  tax-exempt  interest when  distributed  to  the
    Unitholders.
 
        A  non-corporate Unitholder will not be  subject to the New Jersey Gross
    Income Tax on  any gain realized  either when the  New Jersey Insured  Trust
    disposes  of a  New Jersey Bond  (whether by sale,  exchange, redemption, or
    payment at maturity) or when the Unitholder redeems or sells his Units.  Any
    loss  realized  on such  disposition  may not  be  utilized to  offset gains
    realized by such Unitholder on the  disposition of assets the gain on  which
    is subject to the New Jersey Gross Income Tax.
 
        Units  of the New Jersey Insured Trust may  be taxable on the death of a
    Unitholder under the  New Jersey  Transfer Inheritance  Tax Law  or the  New
    Jersey Estate Tax Law.
 
        If  a Unitholder is a corporation  subject to the New Jersey Corporation
    Business Tax or New Jersey Corporation  Income Tax, interest from the  Bonds
    in the New Jersey
 
                                       37
<PAGE>
    Insured  Trust which is allocable to  such corporation will be includable in
    its entire net income  for purposes of the  New Jersey Corporation  Business
    Tax or New Jersey Corporation Income Tax, less any interest expense incurred
    to  carry such investment to  the extent such interest  expense has not been
    deducted in  computing Federal  taxable income.  Net gains  derived by  such
    corporation  on the disposition  of the New  Jersey Bonds by  the New Jersey
    Insured Trust or on  the disposition of  its Units will  be included in  its
    entire net income for purposes of the New Jersey Corporation Business Tax or
    New Jersey Corporation Income Tax.
 
ECONOMIC FACTORS--NEW JERSEY
 
    As  described above, the New Jersey Insured Trust consists of a portfolio of
New Jersey Bonds. The Trust is  therefore susceptible to political, economic  or
regulatory  factors affecting  issuers of  the New  Jersey Bonds.  The following
information provides  only  a brief  summary  of  some of  the  complex  factors
affecting  the financial  situation in New  Jersey (the "State")  and is derived
from sources that  are generally available  to investors and  is believed to  be
accurate.  It is based  in part on  information obtained from  various State and
local agencies in New Jersey. No  independent verification has been made of  any
of the following information.
 
    New  Jersey is the ninth largest state  in population and the fifth smallest
in land area. With an  average of 1,062 people per  square mile, it is the  most
densely  populated of all the states.  The State's economic base is diversified,
consisting of a variety of  manufacturing, construction and service  industries,
supplemented by rural areas with selective commercial agriculture. Historically,
New Jersey's average per capita income has been well above the national average,
and  in 1993  the State ranked  second among  the states in  per capita personal
income ($26,967).
 
    The New Jersey Economic  Policy Council, a statutory  arm of the New  Jersey
Department  of Commerce  and Economic  Development, has  reported in  NEW JERSEY
ECONOMIC INDICATORS,  a monthly  publication  of the  New Jersey  Department  of
Labor,  Division of Labor Market and Demographic Research, that in 1988 and 1989
employment in  New Jersey's  manufacturing  sector failed  to benefit  from  the
export  boom experienced by many Midwest states and the State's service sectors,
which had  fueled the  State's  prosperity since  1982,  lost momentum.  In  the
meantime,  the prolonged fast growth in the State in the mid 1980s resulted in a
tight labor market situation, which has led to relatively high wages and housing
prices. This  means  that,  while  the  incomes  of  New  Jersey  residents  are
relatively  high,  the State's  business sector  has  become more  vulnerable to
competitive pressures.
 
   
    The onset of  the national recession  (which officially began  in July  1990
according to the National Bureau of Economic Research) caused an acceleration of
New  Jersey's job  losses in  construction and  manufacturing. In  addition, the
national recession  caused an  employment downturn  in such  previously  growing
sectors  as wholesale trade,  retail trade, finance,  utilities and trucking and
warehousing. Reflecting the downturn, the rate of unemployment in the State rose
from a low  of 3.6% during  the first quarter  of 1989 to  an estimated 7.2%  in
January 1995, which is higher than the national average of 5.7% in January 1995.
Economic  recovery  is  likely  to  be  slow  and  uneven  in  New  Jersey, with
unemployment receding at a correspondingly slow pace, due to the fact that  some
sectors may lag due to continued excess capacity. In addition, employers even in
rebounding  sectors can be  expected to remain cautious  about hiring until they
become convinced that improved business  will be sustained. Also, certain  firms
will continue to merge or downsize to increase profitability.
    
 
                                       38
<PAGE>
    DEBT  SERVICE. The primary method for State financing of capital projects is
through the sale of the general obligation  bonds of the State. These bonds  are
backed  by the full faith and credit of the State tax revenues and certain other
fees are pledged to  meet the principal and  interest payments and if  provided,
redemption premium payments, if any, required to repay the bonds. As of June 30,
1993,  there was  a total  authorized bond  indebtedness of  approximately $8.98
billion, of which  $3.6 billion  was issued  and outstanding,  $4.0 billion  was
retired  (including bonds for which provision  for payment has been made through
the sale and issuance  of refunding bonds) and  $1.38 billion was unissued.  The
appropriation  for the debt service  obligation on such outstanding indebtedness
is $103.5 million for Fiscal Year 1995.
 
    NEW JERSEY'S BUDGET AND APPROPRIATION SYSTEM. The State operates on a fiscal
year beginning July 1 and ending June 30. At the end of Fiscal Year 1989,  there
was  a  surplus in  the  State's general  fund (the  fund  into which  all State
revenues not  otherwise  restricted by  statute  are deposited  and  from  which
appropriations  are made)  of $411.2  million. At the  end of  Fiscal Year 1990,
there was a surplus in the general fund of $1 million. At the end of Fiscal Year
1991, there was a surplus in the general fund of $1.4 million. New Jersey closed
its Fiscal Year 1992 with a surplus of $760.8 million. It is estimated that  New
Jersey closed its Fiscal Year 1993 with a surplus of $937.4 million.
 
    In  order  to  provide additional  revenues  to balance  future  budgets, to
redistribute school aid and  to contain real property  taxes, on June 27,  1990,
and  July  12,  1990, Governor  Florio  signed  into law  legislation  which was
estimated to raise approximately $2.8 billion in additional taxes (consisting of
$1.5 billion in  sales and  use taxes  and $1.3  billion in  income taxes),  the
biggest  tax hike in New Jersey history. There can be no assurance that receipts
and collections of such taxes will meet such estimates.
 
    The first  part of  the tax  hike  took effect  on July  1, 1990,  with  the
increase in the State's sales and use tax rate from 6% to 7% and the elimination
of  exemptions for certain  products and services not  previously subject to the
tax, such as telephone calls, paper products (which has since been  reinstated),
soaps  and detergents, janitorial services,  alcoholic beverages and cigarettes.
At the  time  of  enactment, it  was  projected  that these  taxes  would  raise
approximately  $1.5 billion in additional  revenue. Projections and estimates of
receipts from sales  and use taxes,  however, have been  subject to variance  in
recent fiscal years.
 
    The  second part of the tax hike took effect on January 1, 1991, in the form
of an increased state income  tax on individuals. At  the time of enactment,  it
was  projected  that this  increase would  raise  approximately $1.3  billion in
additional income taxes to fund a new school aid formula, a new homestead rebate
program and state assumption of  welfare and social services costs.  Projections
and  estimates of receipts from income taxes, however, have also been subject to
variance in  recent  fiscal  years.  Under the  legislation,  income  tax  rates
increased  from their previous range of  2% to 3.5% to a  new range of 2% to 7%,
with the higher rates applying to married couples with incomes exceeding $70,000
who file joint returns, and to individuals filing single returns with incomes of
more than $35,000.
 
    The Florio administration  had contended  that the income  tax package  will
help  reduce  local  property  tax  increases by  providing  more  state  aid to
municipalities.  Under  the  income  tax  legislation  the  State  will   assume
approximately $289 million in social services costs that previously were paid by
counties and municipalities and funded by property taxes. In addition, under the
new formula for funding school aid, an extra $1.1 billion is proposed to be sent
by  the State to school districts beginning  in 1991, thus reducing the need for
property tax increases to support education programs.
 
                                       39
<PAGE>
   
    Effective July 1, 1992, the State's sales and use tax rate decreased from 7%
to 6%. Effective January 1, 1994, an across-the-board 5% reduction in the income
tax rates was enacted and effective January 1, 1995, further reductions  ranging
from 1% up to 10% in income tax rates took effect.
    
    On June 30, 1994, Governor Whitman signed the New Jersey Legislature's $15.7
billion  budget for Fiscal  Year 1995. The balanced  budget, which includes $455
million in surplus, is $141 million less than the 1994 budget. Whether the State
can achieve a  balanced budget  depends on its  ability to  enact and  implement
expenditure reductions and to collect estimated tax revenues.
 
    LITIGATION. The State is a party in numerous legal proceedings pertaining to
matters  incidental to the performance  of routine governmental operations. Such
litigation includes, but is  not limited to, claims  asserted against the  State
arising   from  alleged  torts,  alleged  breaches  of  contracts,  condemnation
proceedings and other alleged violations of State and Federal laws. Included  in
the  State's  outstanding litigation  are cases  challenging the  following: the
formula relating to State aid to public  schools, the method by which the  State
shares with its counties maintenance recoveries and costs for residents in State
institutions,  unreasonably low Medicaid payment  rates for long-term facilities
in New  Jersey, the  obligation of  counties to  maintain Medicaid  or  Medicare
eligible  residents  of  institutions  and  facilities  for  the developmentally
disabled, taxes paid  into the Spill  Compensation Fund (a  fund established  to
provide  money for use  by the State  to remediate hazardous  waste sites and to
compensate other persons  for damages incurred  as a result  of hazardous  waste
discharge)   based   on  Federal   preemption,   various  provisions,   and  the
constitutionality, of  the Fair  Automobile Insurance  Reform Act  of 1990,  the
State's  role  in a  consent  order concerning  the  construction of  a resource
facility in Passaic County, actions taken by the New Jersey Bureau of Securities
against  an  individual,   the  State's  actions   regarding  alleged   chromium
contamination  of  State-owned  property  in  Hudson  County,  the  issuance  of
emergency  redirection  orders  and  a   draft  permit  by  the  Department   of
Environmental  Protection and Energy, the adequacy of Medicaid reimbursement for
services rendered by  doctors and  dentists to Medicaid  eligible children,  the
Commissioner  of Health's calculation of the hospital assessment required by the
Health Care Cost  Reduction Act  of 1991,  refusal of  the State  to share  with
Camden  County federal funding the  State recently received for disproportionate
share  hospital  payments  made  to  county  psychiatric  facilities,  and   the
constitutionality  of annual A-901  hazardous and solid  waste licensure renewal
fees collected by the Department of Environmental Protection and Energy. Adverse
judgments in  these and  other matters  could have  the potential  for either  a
significant  loss of revenue  or a significant  unanticipated expenditure by the
State.
 
    At any given  time, there are  various numbers of  claims and cases  pending
against  the State,  State agencies and  employees seeking  recovery of monetary
damages that are  primarily paid out  of the  fund created pursuant  to the  New
Jersey  Tort  Claims Act.  In addition,  at  any given  time, there  are various
numbers of contract claims against the State and State agencies seeking recovery
of monetary damages.  The State  is unable to  estimate its  exposure for  these
claims.
 
    DEBT  RATINGS. For many years prior to 1991, both Moody's Investors Service,
Inc. and Standard and Poor's Corporation had rated New Jersey general obligation
bonds "Aaa" and  "AAA," respectively.  On July  3, 1991,  however, Standard  and
Poor's  Corporation downgraded New Jersey general  obligation bonds to "AA+." On
June 4,  1992,  Standard  and  Poor's  Corporation  placed  New  Jersey  general
obligation  bonds  on  CreditWatch  with negative  implications,  citing  as its
principal   reason   for   its   caution   the   unexpected   denial   by    the
 
                                       40
<PAGE>
Federal  Government  of New  Jersey's request  for  $450 million  in retroactive
Medicaid payments  for  psychiatric  hospitals. These  funds  were  critical  to
closing  a $1 billion gap in the State's $15 billion budget for fiscal year 1992
which ended on June 30, 1992. Under New Jersey state law, the gap in the current
budget must be closed before the new budget year began on July 1, 1992. Standard
and Poor's Corporation suggested the State could close fiscal 1992's budget  gap
and  help fill  fiscal 1993's  hole by  a reversion  of $700  million of pension
contributions to its general fund under a  proposal to change the way the  State
calculates  its  pension  liability.  On  July  6,  1992,  Standard  and  Poor's
Corporation reaffirmed its "AA+" rating for New Jersey general obligation  bonds
and  removed the  debt from  its CreditWatch list,  although it  stated that New
Jersey's  long-term  financial  outlook   was  negative.  Standard  and   Poor's
Corporation  was concerned that the State was entering the 1993 fiscal year that
began July 1, 1992, with a slim $26 million surplus and remained concerned about
whether  the  sagging  State  economy  would  recover  quickly  enough  to  meet
lawmakers'  revenue  projections. It  also remained  concerned about  the recent
federal ruling  leaving in  doubt how  much  the State  was due  in  retroactive
Medicaid  reimbursements and a ruling by a  federal judge, now on appeal, of the
State's method for paying for uninsured hospital patients. However, on July  27,
1994,  S&P announced that it  was changing the State's  outlook from negative to
stable due to a  brightening of the  State's prospects as  a result of  Governor
Whitman's  effort  to trim  spending and  cut taxes,  coupled with  an improving
economy. S&P reaffirmed its "AA+" rating at the same time.
 
    On August 24, 1992,  Moody's Investors Service,  Inc. downgraded New  Jersey
general  obligation  bonds  to "Aa1",  stating  that the  reduction  reflected a
developing pattern of  reliance on  nonrecurring measures  to achieve  budgetary
balance,  four years  of financial operations  marked by  revenue shortfalls and
operating deficits, and  the likelihood that  serious financial pressures  would
persist.  On August 5, 1994, Moody's reaffirmed  its "Aa1" rating, citing on the
positive side New Jersey's broad-based  economy, high income levels, history  of
maintaining  a  positive financial  position and  moderate (albeit  rising) debt
ratios, and, on the negative side, a continued reliance on one-time revenues and
a dependence on pension-related savings to achieve budgetary balance.
 
NEW JERSEY 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.
 
                                       41
<PAGE>
 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      17.0   %     6.02    6.33    6.63    6.93    7.23    7.53    7.83    8.13
    39.0- 94.3       0-114.7      32.5         7.41    7.78    8.15    8.52    8.89    9.26    9.63   10.00
                 114.7-172.1      33.0         7.46    7.84    8.21    8.58    8.96    9.33    9.70   10.07
    94.3-143.6       0-114.7      35.0         7.69    8.08    8.46    8.85    9.23    9.62   10.00   10.38
                 114.7-172.1      36.0         7.81    8.20    8.59    8.98    9.38    9.77   10.16   10.55
                 172.1-294.6      38.5         8.13    8.54    8.94    9.35    9.76   10.16   10.57   10.98
   143.6-256.5   114.7-172.1      41.0         8.47    8.90    9.32    9.75   10.17   10.59   11.02   11.44
                 172.1-294.6      44.0         8.93    9.38    9.82   10.27   10.71   11.16   11.61   12.05
                  Over 294.6      41.0   2     8.47    8.90    9.32    9.75   10.17   10.59   11.02   11.44
    Over 256.5   172.1-294.6      47.5         9.52   10.00   10.48   10.95   11.43   11.90   12.38   12.86
                  Over 294.6      44.5   3     9.01    9.46    9.91   10.36   10.81   11.26   11.71   12.16
</TABLE>
 
  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 $     0-114.7      17.0   %     6.02    6.33    6.63    6.93    7.23    7.53    7.83    8.13
    23.4- 56.6       0-114.7      32.5         7.41    7.78    8.15    8.52    8.89    9.26    9.63   10.00
    56.6-118.0       0-114.7      35.5         7.75    8.14    8.53    8.91    9.30    9.69   10.08   10.47
                 114.7-237.2      37.0         7.94    8.33    8.73    9.13    9.52    9.92   10.32   10.71
   118.0-256.5   114.7-237.2      42.0         8.62    9.05    9.48    9.91   10.34   10.78   11.21   11.64
                  Over 237.2      41.0   2     8.47    8.90    9.32    9.75   10.17   10.59   11.02   11.44
    Over 256.5    Over 237.2      44.5   3     9.01    9.46    9.91   10.36   10.81   11.26   11.71   12.16
<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.
 
                                       42
<PAGE>
   
NUVEEN TAX-EXEMPT UNIT TRUST
SCHEDULE OF INVESTMENTS AT DATE OF DEPOSIT
FEBRUARY 17, 1995
NEW JERSEY INSURED TRUST 187
(SERIES 785)
    
 
<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      New Jersey Building Authority, State Building       2003 at 102        AAA         Aaa     $       430,695
                   Revenue Bonds, 1994 Series, 5.00% Due
                   6/15/19.
    230,000      New Jersey Economic Development Authority,          2003 at 102        AAA         Aaa             207,041
                   Economic Development Revenue Bonds (Greater
                   New York Councils, Boy Scouts of America-1993
                   Project), 5.45% Due 9/1/23.
    270,000      New Jersey Economic Development Authority,          2004 at 102        AAA         Aaa             259,030
                   Water Facilities Revenue Refunding Bonds
                   (Hackensack Water Company Project-1994 Series
                   A), 5.80% Due 3/1/24.
    500,000      New Jersey Health Care Facilities Financing         2004 at 102        AAA         Aaa             485,000
                   Authority, Refunding Revenue Bonds, Wayne
                   General Hospital, Corp. Issue (FHA Insured
                   Mortgage), Series B, 5.875% Due 8/1/18.
    500,000      The Port Authority of New York and New Jersey,      2004 at 101        AAA         Aaa             443,935
                   Consolidated Bonds, Ninety-Second Series,
                   5.00% Due 7/15/12.
    500,000      The Board of Education of the Borough of            2005 at 102        AAA         Aaa             517,500
                   Highland Park, in the County of Middlesex,
                   New Jersey, School Bonds, 6.55% Due 2/15/20.
                   (General Obligation Bonds.)
    500,000      The Pollution Control Financing Authority of        2004 at 102        AAA         Aaa             496,390
                   Salem County (New Jersey), Pollution Control
                   Revenue Refunding Bonds, 1994 Series B
                   (Public Service Electric and Gas Company
                   Project), 6.25% Due 6/1/31.
    500,000      Commonwealth of Puerto Rico, Public Improvement   2004 at 101 1/2      AAA         Aaa             516,185
                   Bonds of 1994 (General Obligation Bonds),
                   6.50% Due 7/1/23.
- -----------                                                                                                 ---------------
$ 3,500,000                                                                                                 $     3,355,776
- -----------                                                                                                 ---------------
- -----------                                                                                                 ---------------
</TABLE>
 
See Notes to Schedules of Investments, page 68.
 
                                       43
<PAGE>
   
NEW YORK INSURED TRUST 231
    
   
    The Portfolio of New York Insured Trust 231 consists of 7 obligations issued
by  entities located in New York and  one obligation issued by an entity located
in the Territory of Puerto Rico. Two Bonds in the Trust are general  obligations
of  the governmental entities issuing  them and are backed  by the taxing powers
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: Dedicated-Tax Supported Revenue, 1; Bridge and Toll Road Revenue, 1;
Electrical System Revenue,  1; Health Care  Facility Revenue, 1;  Transportation
Facility  Revenue, 1; Municipal Lease 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.
    
 
   
    At  the Date of Deposit,  the average maturity of the  Bonds in the New York
Insured Trust is 28.0  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  48.1% of the  aggregate principal amount of  the Bonds in the
Trust (accounting for approximately 48.7% 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.
    
 
    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 15,
1995 and February 16, 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>
  $3,307,444       $13,267           $202,983      $3,302,817                 .51%
</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  New York Insured Trust, less estimated  expenses, is estimated to accrue at
the rate of $.01562 per Unit per day under the semi-annual plan of distribution,
$.01557 per Unit per  day under the quarterly  plan of distribution and  $.01548
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.
    
 
                                       44
<PAGE>
    Details of interest  distributions per Unit  of the New  York 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
NEW YORK 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.............  $   .6811(1)                                              $  5.5753
                                                        --------  $.4644 every month  --------
Quarterly Distribution Plan...........  $   .6811(1)   $   .4671(2)   $  1.4013      $  1.4013    $  5.6073
Semi-Annual Distribution Plan.........  $   .6811(1)   $   .4686(3)                  $  2.8116    $  5.6263
- ----------------------------------------------------------------------------------------------------------------
<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--NEW YORK INSURED TRUST
 
    For a discussion  of the Federal  tax status  of income earned  on New  York
Insured Trust Units, see Section 11.
 
    In  the opinion of Edwards & Angell,  special counsel for the Series for New
York tax matters, under existing law:
 
        Interest  on  obligations  issued  by   New  York  State,  a   political
    subdivision  thereof, Puerto  Rico, the  Virgin Islands,  Guam, the Northern
    Mariana Islands,  or  other possessions  of  the United  States  within  the
    meaning  of Section 103(c) of the Internal  Revenue Code of 1986, as amended
    ("New York Obligations"), which would be  exempt from New York State or  New
    York  City personal  income tax if  directly received by  a Unitholder, will
    retain its  status as  tax-exempt interest  when received  by the  New  York
    Insured Trust (the "Trust") and distributed to such Unitholder.
 
        Interest  (less amortizable premium, if any) derived from the Trust by a
    resident of New  York State  (or New York  City) in  respect of  obligations
    issued  by states other than New York (or their political subdivisions) will
    be subject to New York State (or New York City) personal income tax.
 
        A Unitholder who is a resident of New York State (or New York City) will
    be subject to New  York State (or  New York City)  personal income tax  with
    respect  to gains realized  when New York  Obligations held in  the New York
    Insured  Trust  are  sold,  redeemed  or  paid  at  maturity  or  when   the
    Unitholder's  Units are sold or redeemed;  such gain will equal the proceeds
    of sale, redemption or payment less the tax basis of the New York Obligation
    or Unit (adjusted to reflect (a) the amortization of premium or discount, if
    any, on New York Obligations held  by the Trust, (b) accrued original  issue
    discount,  with respect to each  New York Obligation which,  at the time the
    New York Obligation  was issued, had  original issue discount,  and (c)  the
    deposit of New York Obligations with accrued interest in the Trust after the
    Unitholder's settlement date).
 
        Interest  or gain from  the Trust derived  by a Unitholder  who is not a
    resident of New York  State (or New  York City) will not  be subject to  New
    York State (or New York City)
 
                                       45
<PAGE>
    personal  income tax, unless the Units  are property employed in a business,
    trade, profession or occupation  carried on in New  York State (or New  York
    City).
 
        In  the case  of the  Trust, amounts  paid under  the insurance policies
    representing maturing interest on defaulted New York Obligations held by the
    Trustee in the Trust  will be excludable  from New York  State and New  York
    City  income if, and  to the same  extent as, such  interest would have been
    excludable if paid by the respective issuer.
 
        For purposes of the New  York State and New  York City franchise tax  on
    corporations,  Unitholders which are subject to such tax will be required to
    include in their entire net income any interest or gains distributed to them
    even  though  distributed  in  respect  of  obligations  of  any  state   or
    subdivision thereof including New York.
 
        If borrowed funds are used to purchase Units in the Trust, all (or part)
    of  the interest on  such indebtedness will  not be deductible  for New York
    State and  New  York  City  tax  purposes. The  purchase  of  Units  may  be
    considered  to have been made with borrowed funds even though such funds are
    not directly traceable to the purchase of Units in any New York Trust.
 
ECONOMIC FACTORS--NEW YORK
 
    The Portfolio of the New York  Insured Trust includes obligations issued  by
New  York State  (the "State"), by  its various public  bodies (the "Agencies"),
and/or by other  entities located within  the State, including  the City of  New
York (the "City").
 
    Some of the more significant events and conditions relating to the financial
situation  in New York are summarized below.  This section provides only a brief
summary of the complex factors affecting the financial situation in New York and
is derived  from  sources that  are  generally  available to  investors  and  is
believed  to  be  accurate. It  is  based  in part  on  Official  Statements and
prospectuses issued by, and on other information reported by the State, the City
and the Agencies in connection with the issuance of their respective securities.
 
    There can  be no  assurance that  current or  future statewide  or  regional
economic  difficulties, and  the resulting impact  on State  or local government
finances generally,  will not  adversely affect  the market  value of  New  York
Municipal  Obligations held  in the  portfolio of  the Trust  or the  ability of
particular obligors to make timely payments of debt service on (or relating  to)
those obligations.
 
    (1)  THE STATE: The State has historically been one of the wealthiest states
in the nation.  For decades, however,  the State economy  has grown more  slowly
than  that of  the nation  as a  whole, gradually  eroding the  State's relative
economic  affluence.  Statewide,  urban  centers  have  experienced  significant
changes involving migration of the more affluent to the suburbs and an influx of
generally  less affluent residents. Regionally,  the older Northeast cities have
suffered because of the relative success that the South and the West have had in
attracting  people  and  business.  The  City  has  also  had  to  face  greater
competition  as  other  major  cities  have  developed  financial  and  business
capabilities  which  make  them  less  dependent  on  the  specialized  services
traditionally available almost exclusively in the City.
 
    The  State has  for many years  had a very  high state and  local tax burden
relative to other states. The burden of State and local taxation, in combination
with the many other causes of regional economic dislocation, has contributed  to
the  decisions of  some businesses and  individuals to relocate  outside, or not
locate within, the State.
 
    SLOWDOWN OF REGIONAL  ECONOMY. A national  recession commenced in  mid-1990.
The  downturn  continued  throughout the  State's  1990-91 fiscal  year  and was
followed by a period of weak economic growth during the 1991 calendar year.  For
calendar  year 1992,  the national economy  continued to recover,  although at a
rate below all  post-war recoveries. For  calendar year 1993,  the economy  grew
faster    than   in    1992,   but    still   at    a   very    moderate   rate,
 
                                       46
<PAGE>
as compared  to  other  recoveries.  Moderate economic  growth  is  expected  to
continue  in calendar year 1994 at a slightly faster rate than in 1993. Economic
recovery started considerably later in the State  than in the nation as a  whole
due  in  part  to the  significant  retrenchment  in the  banking  and financial
services industries,  downsizing  by  several major  corporations,  cutbacks  in
defense  spending,  and an  oversupply of  office buildings.  Many uncertainties
exist in forecasts of both the national and State economies and there can be  no
assurance  that the State economy will perform at a level sufficient to meet the
State's projections of receipts and disbursements.
 
    1994-95 FISCAL YEAR. The Governor presented the recommended Executive Budget
for the 1994-95 fiscal year on January  18, 1994 and amended it on February  17,
1994.  the Recommended 1994-95 State Financial  Plan projects a balanced General
Fund, receipts and transfers  from other funds at  $33.422 billion (including  a
projected  $339 million surplus anticipated for the State's 1993-94 fiscal year)
and disbursements and transfers to other funds at $33.399 billion.
 
    The recommended 1994-95  Executive Budget  includes tax  and fee  reductions
($210  million), retention of revenues currently received, primarily by deferral
of a  scheduled  personal  income  tax  rate  reduction  ($1.244  billion),  and
additional  increases to miscellaneous revenue  sources ($237 million). No major
additional programs are recommended other than a $198 million increase in school
aid, $185 million in Medicaid  cost-containment initiatives and $110 million  in
local government Medicaid costs to be assumed by the State.
 
    There  can  be  no  assurance  that the  State  Legislature  will  enact the
Executive  Budget  as  proposed,  nor  can  there  be  any  assurance  that  the
Legislature will enact a budget for the State's 1994-95 fiscal year prior to its
commencement.  A delay in  its enactment may  negatively affect certain proposed
actions and reduce projected savings.
 
    1993-94 FISCAL YEAR. The  1993-94 State Financial Plan  issued on April  16,
1993  projected General Fund receipts and  transfers from other funds at $32.367
billion and disbursements and  transfers to other funds  at $32.300 billion.  In
comparison to the Governor's recommended Executive Budget for the 1993-94 fiscal
year,  as  revised  on  February  18, 1993,  the  1993-94  State  Financial Plan
reflected increases in both  receipts and disbursements in  the General Fund  of
$811 million.
 
    The  1993-94 State Financial Plan was last  revised on January 18, 1994. The
State projects a surplus  of $299 million, as  the result of developments  which
positively  impacted upon receipts  and disbursements. In  the revised Plan, the
State announced its intention to pay  a 53rd weekly Medicaid payment,  estimated
at $120 million, and to add $82 million to a reserve fund for contingencies.
 
    On  January 21, 1994, the State entered into a settlement with Delaware with
respect to STATE OF DELAWARE V. STATE  OF NEW YORK, which is discussed below  at
STATE  LITIGATION. The State made an immediate $35 million payment and agreed to
make a $33 million  annual payment in  each of the next  five fiscal years.  The
State  has not settled with other parties to the litigation and will continue to
incur litigation expenses as to those claims.
 
    On November  16, 1993,  the Court  of Appeals,  the State's  highest  court,
affirmed  the  decision  of  a  lower court  in  three  actions,  which declared
unconstitutional State actuarial funding methods for determining State and local
contributions to the State employee  retirement system. Following the  decision,
the  State Comptroller  developed a  plan to  phase in  a constitutional funding
method and to restore prior funding levels of the retirement systems over a four
year period. The plan is  not expected to require  the State to make  additional
contributions  with respect  to the  1993-94 fiscal  year nor  to materially and
adversely affect the State's financial condition thereafter. Through fiscal year
1998-99, the State expects to
 
                                       47
<PAGE>
contribute $643  million more  to  the retirement  plans  than would  have  been
required under the prior funding method.
 
    FUTURE  FISCAL YEARS. There can be no assurance that the State will not face
substantial potential budget  gaps in  the future resulting  from a  significant
disparity  between tax revenues  projected from a  lower recurring receipts base
and the  spending required  to maintain  State programs  at current  levels.  To
address   any  potential  budgetary  imbalance,  the  State  may  need  to  take
significant actions to align recurring receipts and disbursements.
 
    INDEBTEDNESS. As of December 31, 1993,  the total amount of long-term  State
general obligation debt authorized but unissued stood at $2.3 billion. As of the
same  date, the State had approximately $5.0 billion in general obligation bonds
and $2.94 million  of Bond Anticipation  Notes ("BANS"). The  State issued  $850
million  in tax and revenue anticipation notes  ("TRANS") on May 4, all of which
matured on December 31, 1993. The State does not project the need to issue TRANS
during the State's 1994-95 fiscal year.
 
    The State anticipates that  its borrowings for  capital purposes during  the
State's  1994-95 fiscal year will consist  of $413 million in general obligation
bonds and BANS.  The projection of  the State regarding  its borrowings for  the
1994-95  fiscal  year  may  change  if  actual  receipts  fall  short  of  State
projections or if other circumstances require.
 
    In  June  1990,  legislation  was  enacted  creating  the  "New  York  Local
Government  Assistance  Corporation"  ("LGAC"),  a  public  benefit  corporation
empowered to  issue long-term  obligations  to fund  certain payments  to  local
governments  traditionally funded through the State's annual seasonal borrowing.
As of February 28, 1994,  LGAC has issued its bonds  to provide net proceeds  of
$3.7  billion. The Governor has recommended  the issuance of additional bonds to
provide net proceeds of $315 million during the State's 1994-95 fiscal year.
 
    The Legislature  passed  a  proposed constitutional  amendment  which  would
permit  the State subject to certain restrictions to issue revenue bonds without
voter referendum. Among the restrictions proposed  is that such bonds would  not
be  backed by the  full faith and credit  of the State.  The Governor intends to
submit changes to the proposed  amendment, which before becoming effective  must
be passed again by the next separately-elected Legislature and approved by voter
referendum  at a  general election.  The earliest  such an  amendment could take
effect would be in November 1995.
 
    RATINGS.  The $850 million in TRANS  issued by the State in April 1993  were
rated  SP-1-Plus by  S&P on April  26, 1993, and  MIG-1 by Moody's  on April 23,
1993, which represents the highest ratings given by such agencies and the  first
time  the State's  TRANS have  received these ratings  since its  May 1989 TRANS
issuance. Both  agencies  cited  the  State's  improved  fiscal  position  as  a
significant factor in the upgrading of the April 1993 TRANS.
 
    Moody's  rating of the State's general obligation  bonds stood at A on April
23, 1993, and S&P's rating stood at A- with a stable outlook on April 26,  1993,
an  improvement from  S&P's negative  outlook prior  to April  1993. Previously,
Moody's lowered its rating to A on June 6, 1990, its rating having been A1 since
May 27, 1986. S&P  lowered its rating from  A to A- on  January 13, 1992.  S&P's
previous ratings were A from March 1990 to January 1992, AA- from August 1987 to
March 1990 and A+ from November 1982 to August 1987.
 
    Moody's  maintained  its  A  rating  and  S&P  continued  its  A-  rating in
connection with the State's issuance of $224.1 million of its general obligation
bonds in March 1994.
 
    (2) THE  CITY AND  THE MUNICIPAL  ASSISTANCE CORPORATION  ("MAC"): The  City
accounts  for approximately 41%  of the State's  population and personal income,
and the City's financial health affects the State in numerous ways.
 
    In response to the City's fiscal crisis in 1975, the State took a number  of
steps  to assist the City in returning to fiscal stability. Among other actions,
the State Legislature (i) created
 
                                       48
<PAGE>
MAC to assist with long-term financing for the City's short-term debt and  other
cash  requirements  and  (ii) created  the  State Financial  Control  Board (the
"Control Board") to  review and approve  the City's budgets  and City  four-year
financial  plans (the financial plans also  apply to certain City-related public
agencies (the "Covered Organizations")).
 
    Over the past  three years,  the rate  of economic  growth in  the City  has
slowed  substantially, and  the City's  economy is  currently in  recession. The
Mayor  is  responsible  for  preparing  the  City's  four-year  financial  plan,
including  the City's  current financial plan.  The City  Comptroller has issued
reports concluding that the recession of the City's economy will be more  severe
and last longer than is assumed in the financial plan.
 
    FISCAL  YEAR 1993 AND 1994-1997 FINANCIAL PLAN.  The City's 1993 fiscal year
results are  projected to  be  balanced in  accordance with  generally  accepted
accounting  principles  ("GAAP"). The  City  was required  to  close substantial
budget gaps  in its  1990,  1991 and  1992 fiscal  years  in order  to  maintain
balanced operating results.
 
    On  August 10, 1993, the City adopted and submitted to the Control Board its
Financial Plan for fiscal  years 1994-1997, which  was subsequently modified  on
November  23, 1993. As modified  in November 1993, the  Plan projects a balanced
budget for fiscal year 1994 based upon revenues of $31.585 billion, and projects
budget gaps of $1.7 billion, $2.5 billion and $2.7 billion in fiscal years  1995
through 1997, respectively.
 
    During  December  1993, a  three-member panel  appointed  by the  Mayor, the
Office of  the State  Deputy  Comptroller and  the  Control Board,  each  issued
reports  that were critical  of the City's 1994-1996  Financial Plan. While each
report noted  improvement in  the  outlook for  fiscal  year 1994,  the  reports
indicated  that the  budget gap for  fiscal year 1995  could be as  much as $450
million higher than projected and that the budget gap might continue to increase
in later years to as  much as $1.5 billion  above current projections by  fiscal
year 1997. Recommendations included addressing the City's tax and cost structure
to maximize revenues on a recurring basis and minimize expenditures, a review of
capital   spending  plans,   service  cuts,  productivity   gains  and  economic
development measures.
 
    On February  2,  1994,  the  Mayor proposed  further  modifications  to  the
1994-1997  Financial Plan. The Mayor's proposed  Plan projects a balanced budget
for fiscal  year 1994,  assuming revenues  of $31.735  billion, and  includes  a
reserve  of $198  million. The  proposed modification  projects budget  gaps for
fiscal years 1995, 1996 and 1997 of $2.3 billion, $3.2 billion and $3.3 billion,
respectively. The  Mayor identified  $2.2 billion  in gap  closing measures  for
fiscal  year 1995. Implementation of these measures will require the cooperation
of  municipal  labor  unions,  the  City  Council  and  the  State  and  Federal
governments.  The Mayor's proposal  includes a tax  reduction program which will
have a financial impact on later years.
 
    Given the foregoing factors,  there can be no  assurance that the City  will
continue  to maintain  a balanced  budget, or  that it  can maintain  a balanced
budget without additional tax or other  revenue increases or reductions in  City
services, which could adversely affect the City's economic base.
 
    Pursuant  to State law, the City prepares a four-year annual financial plan,
which is reviewed and revised on a quarterly basis and which includes the City's
capital, revenue and  expense projections. The  City is required  to submit  its
financial  plans to review bodies, including the Control Board. If the City were
to experience certain adverse financial circumstances, including the  occurrence
or  the  substantial likelihood  and imminence  of the  occurrence of  an annual
operating deficit of more than $100 million or the loss of access to the  public
credit   markets  to   satisfy  the   City's  capital   and  seasonal  financial
requirements, the  Control Board  would be  required by  State law  to  exercise
certain  powers,  including prior  approval  of City  financial  plans, proposed
borrowings and certain contracts.
 
                                       49
<PAGE>
    The City depends  on the  State for  State aid both  to enable  the City  to
balance  its budget and to meet its  cash requirements. If the State experiences
revenue shortfalls or spending increases beyond its projections during its  1993
fiscal year or subsequent years, such developments could result in reductions in
projected  State aid to  the City. In  addition, there can  be no assurance that
State budgets in future fiscal  years will be adopted  by the April 1  statutory
deadline  and that there will not be adverse effects on the City's cash flow and
additional City expenditures as a result of such delays.
 
    The City projections set  forth in its financial  plan are based on  various
assumptions and contingencies which are uncertain and which may not materialize.
Changes  in major assumptions  could significantly affect  the City's ability to
balance its budget as required by State law and to meet its annual cash flow and
financing requirements. Such assumptions and contingencies include the timing of
any regional  and local  economic recovery,  the absence  of wage  increases  in
excess  of  the  increases assumed  in  its financial  plan,  employment growth,
provision of  State  and  Federal  aid and  mandate  relief,  State  legislative
approval  of future  State budgets, levels  of education expenditures  as may be
required by State  law, adoption of  future City  budgets by the  New York  City
Council,  and  approval  by  the  Governor  or  the  State  Legislature  and the
cooperation of  MAC with  respect  to various  other  actions proposed  in  such
financial plan.
 
    The  City's ability to maintain a  balanced operating budget is dependant on
whether it  can implement  necessary service  and personnel  reduction  programs
successfully.  As discussed above, the City must identify additional expenditure
reductions and revenue sources to achieve balanced operating budgets for  fiscal
years  1994 and  thereafter. Any  such proposed  expenditure reductions  will be
difficult to implement  because of  their size and  the substantial  expenditure
reductions already imposed on City operations in the past two years.
 
    Attaining  a balanced  budget is also  dependent upon the  City's ability to
market its  securities successfully  in the  public credit  markets. The  City's
financing  program  for  fiscal  years 1994  through  1997  contemplates capital
spending of $16.2  billion, which  will be  financed through  issuance of  $10.5
billion  of general  obligation bonds, $4.3  billion of  Water Authority Revenue
Bonds and the balance by Covered Organization obligations, and will be  utilized
primarily to reconstruct and rehabilitate the City's infrastructure and physical
assets  and  to make  capital investments.  A significant  portion of  such bond
financing is used to reimburse the City's general fund for capital  expenditures
already  incurred. In  addition, the  City issues  revenue and  tax anticipation
notes to  finance  its seasonal  working  capital requirements.  The  terms  and
success  of projected  public sales of  City general obligation  bonds and notes
will be subject to prevailing market conditions at the time of the sale, and  no
assurance can be given that the credit markets will absorb the projected amounts
of  public bond and note sales.  In addition, future developments concerning the
City and public  discussion of  such developments, the  City's future  financial
needs  and  other issues  may  affect the  market  for outstanding  City general
obligation bonds  and  notes.  If the  City  were  unable to  sell  its  general
obligation  bonds  and notes,  it would  be prevented  from meeting  its planned
operating and capital expenditures.
 
    FISCAL YEARS 1990,  1991 AND  1992.   The City  achieved balanced  operating
results as reported in accordance with GAAP for the 1992 fiscal year. During the
1990  and 1991 fiscal  years, the City  implemented various actions  to offset a
projected budget  deficit  of $3.2  billion  for  the 1991  fiscal  year,  which
resulted  from declines in City revenue  sources and increased public assistance
needs due to the recession. Such actions included $822 million of tax  increases
and substantial expenditure reductions.
 
    The City is a defendant in a significant number of lawsuits. Such litigation
includes,  but is not limited to,  actions commenced and claims asserted against
the City arising out of
 
                                       50
<PAGE>
alleged constitutional  violations,  torts,  breaches of  contracts,  and  other
violations  of law and condemnation proceedings.  While the ultimate outcome and
fiscal impact,  if  any,  on  the  proceedings  and  claims  are  not  currently
predictable,  adverse determinations  in certain of  them might  have a material
adverse effect upon the City's  ability to carry out  its financial plan. As  of
June  30, 1992, legal claims in excess  of $341 billion were outstanding against
the City for which the City estimated its potential future liability to be  $2.3
billion.
 
    RATINGS.   As of the  date of this prospectus,  Moody's rating of the City's
general obligation bonds stood at Baa1 and S&P's rating stood at A-. On February
11, 1991, Moody's had lowered its rating from A.
 
    On December 6, 1993, in confirming its Baa1 rating, Moody's noted that:
 
        The fiscal 1994 budget is  nominally balanced, in part through  reliance
    on  one-shot revenues, but contains a number  of risks . . . (T)he financial
    plan . . . shows increased gaps in succeeding years.
 
        The financial plan for fiscal 1995 and beyond shows an ongoing imbalance
    between the City's expenditures and  revenues . . . A  key risk is that  the
    replacement  of one-shot revenues is likely to become increasingly difficult
    over time.  Moody's continues  to  expect that  the City's  progress  toward
    achieving  long-term balance will be slow and uneven, but that the City will
    be diligent and prudent in closing gaps as they arise.
 
    As discussed above under FISCAL YEAR  1993 AND 1993-1996 FINANCIAL PLAN,  on
July  2, 1993  after a  review of the  City's budget  for fiscal  year 1994, its
proposed budget  for  fiscal year  1995  and  certain additional  cuts  in  both
proposed by the Mayor and the City Comptroller, S&P confirmed its A- rating with
a  negative  outlook of  the  City's general  obligation  bonds but  indicated a
continuing concern  about budgets  for fiscal  year 1995  and thereafter.  S&P's
rating of the City's general obligation bonds remains unchanged.
 
    On  October 12, 1993, Moody's increased its rating of the City's issuance of
$650 million of Tax  Anticipation Notes ("TANs") to  MIG-1 from MIG-2. Prior  to
that  date, on May 9,  1990, Moody's revised downward  its rating on outstanding
City revenue anticipation notes from MIG-1  to MIG-2 and rated the $900  million
Notes  then  being sold  MIG-2.  S&P's rating  of  the October  1993  TANS issue
increased to SP-1 from SP-2. Prior to that date, on April 29, 1991, S&P  revised
downward its rating on City revenue anticipation notes from SP-1 to SP-2.
 
    As  of June 30, 1993, the City  and MAC had, respectively, $19.6 billion and
$4.5 billion of outstanding net long-term indebtedness.
 
    (3) THE STATE AGENCIES: Certain Agencies of the State have faced substantial
financial difficulties which could adversely affect the ability of such Agencies
to make payments  of interest  on, and  principal amounts  of, their  respective
bonds.  The  difficulties  have in  certain  instances caused  the  State (under
so-called  "moral  obligation"  provisions   which  are  non-binding   statutory
provisions  for State  appropriations to  maintain various  debt service reserve
funds) to appropriate funds on behalf of the Agencies. Moreover, it is  expected
that  the  problems  faced by  these  Agencies  will continue  and  will require
increasing amounts of State assistance in future years. Failure of the State  to
appropriate  necessary amounts or to take  other action to permit those Agencies
having financial  difficulties  to meet  their  obligations could  result  in  a
default by one or more of the Agencies. Such default, if it were to occur, would
be  likely to have a  significant adverse effect on  investor confidence in, and
therefore the  market  price of,  obligations  of the  defaulting  Agencies.  In
addition,  any default in payment on any  general obligation of any Agency whose
bonds contain a moral obligation provision could constitute a failure of certain
conditions that must be satisfied in connection with Federal guarantees of  City
and  MAC obligations  and could thus  jeopardize the  City's long-term financing
plans.
 
                                       51
<PAGE>
    As of  September 30,  1993,  the State  reported  that there  were  eighteen
Agencies  that each had outstanding debt of $100 million or more. These eighteen
Agencies had  an  aggregate of  $63.5  billion of  outstanding  debt,  including
refunding  bonds, of which $7.7  billion was moral obligation  debt of the State
and $19.3 billion  was financed under  lease-purchase or contractual  obligation
financing arrangements.
 
    (4) STATE LITIGATION: The State is a defendant in numerous legal proceedings
pertaining  to  matters incidental  to the  performance of  routine governmental
operations. Such litigation  includes, but  is not limited  to, claims  asserted
against  the State  arising from alleged  torts, alleged  breaches of contracts,
condemnation proceedings and other alleged violations of State and Federal laws.
Included in the State's outstanding litigation are a number of cases challenging
the constitutionality  or  the  adequacy  and  effectiveness  of  a  variety  of
significant  social  welfare  programs primarily  involving  the  State's mental
hygiene programs. Adverse judgments in  these matters generally could result  in
injunctive  relief coupled with prospective changes  in patient care which could
require substantial increased financing of the litigated programs in the future.
 
    The State  is  also engaged  in  a  variety of  claims  wherein  significant
monetary  damages are sought. Actions commenced  by several Indian nations claim
that significant amounts of land were unconstitutionally taken from the  Indians
in  violation  of  various treaties  and  agreements during  the  eighteenth and
nineteenth centuries. The claimants seek  recovery of approximately six  million
acres of land as well as compensatory and punitive damages.
 
    The  U.S. Supreme Court on March 30,  1993, referred to a Special Master for
determination of damages an action by  the State of Delaware to recover  certain
unclaimed  dividends,  interest  and  other  distributions  made  by  issuers of
securities held by New  York based-brokers incorporated  in Delaware. (STATE  OF
DELAWARE  V. STATE  OF NEW  YORK.) The State  had taken  such unclaimed property
under its ABANDONED  PROPERTY LAW.  New York and  Delaware have  entered into  a
settlement  agreement which provides for a payment of $35 million in fiscal year
1993-94 and thereafter five $33 million annual payments. Claims of other  states
and  the District of Columbia  have not been settled  and the State expects that
additional payments,  which may  be significant,  may be  required with  respect
thereto during fiscal year 1994 and thereafter.
 
    In  SCHULZ V.  STATE OF  NEW YORK, commenced  May 24,  1993 ("SCHULZ 1993"),
petitioners have challenged the constitutionality of mass transportation bonding
programs  of  the  New  York  State  Thruway  Authority  and  the   Metropolitan
Transportation  Authority. On  May 24, 1993,  the Supreme  Court, Albany County,
temporarily enjoined  the State  from implementing  those bonding  programs.  In
previous  actions  Mr.  Schulz and  others  have challenged  on  similar grounds
bonding programs for the  New York State Urban  Development Corporation and  the
New  York  Local Government  Assistance Corporation.  While  there have  been no
decisions on the merits in  such previous actions, by  an opinion dated May  11,
1993,  the New York Court of Appeals held in a proceeding commenced on April 29,
1991 in the Supreme  Court, Albany County  (SCHULZ V. STATE  OF NEW YORK),  that
petitioners  had standing as  voters under the State  Constitution to bring such
action.
 
    Petitioners in SCHULZ 1993 have asserted  that issuance of bonds by the  two
Authorities  is subject to  approval by statewide  referendum. By decision dated
October 21, 1993, the Appellate  Division, Third Department, affirmed the  order
of  the Supreme  Court, Albany County,  granting the State's  motion for summary
judgment, dismissing the complaint and vacating the temporary restraining order.
In December 1993, the New York Court of Appeals indicated that it would hear the
plaintiffs' appeal of the Appellate Division's decision in SCHULZ 1993. At  this
time  there can be no forecast of the likelihood of success on the merits by the
petitioners, but  a  decision  upholding  this  constitutional  challenge  could
restrict  and limit the ability of the State and its instrumentalities to borrow
funds in the future.
 
                                       52
<PAGE>
    Adverse developments in the foregoing  proceedings or new proceedings  could
adversely affect the financial condition of the State in the future.
 
    (5)  OTHER MUNICIPALITIES: Certain  localities in addition  to New York City
could  have  financial  problems  leading  to  requests  for  additional   State
assistance.  The potential impact on the State  of such actions by localities is
not included in projections  of State receipts and  expenditures in the  State's
1993-94 and 1994-95 fiscal years.
 
    Fiscal  difficulties experienced by the City of Yonkers ("Yonkers") resulted
in the creation  of the Financial  Control Board  for the City  of Yonkers  (the
"Yonkers  Board")  by the  State  in 1984.  The  Yonkers Board  is  charged with
oversight of the fiscal affairs of Yonkers. Future actions taken by the Governor
or the State Legislature to assist  Yonkers could result in allocation of  State
resources in amounts that cannot yet be determined.
 
    Municipalities  and school districts have  engaged in substantial short-term
and long-term borrowings. In 1991, the  total indebtedness of all localities  in
the  State was approximately $31.6  billion, of which $16.8  billion was debt of
New York  City (excluding  $6.7 billion  in MAC  debt). State  law requires  the
Comptroller  to review and make recommendations  concerning the budgets of those
local government units other than New York City authorized by State law to issue
debt to  finance deficits  during  the period  that  such deficit  financing  is
outstanding. Fifteen localities had outstanding indebtedness for state financing
at  the close of their  fiscal year ending in 1991.  In 1992, an unusually large
number of local government units requested authorization for deficit financings.
According to the Comptroller, ten local government units have been authorized to
issue deficit financing in the aggregate amount of $131.1 million.
 
    Certain proposed Federal  expenditure reductions  could reduce,  or in  some
cases  eliminate, Federal funding  of some local  programs and accordingly might
impose substantial increased expenditure requirements on affected localities. If
the State, New York City or any of the Agencies were to suffer serious financial
difficulties jeopardizing their respective access to the public credit  markets,
the  marketability of  notes and  bonds issued  by localities  within the State,
including notes  or bonds  in the  New York  Insured Trust,  could be  adversely
affected. Localities also face anticipated and potential problems resulting from
certain  pending litigation, judicial decisions, and long-range economic trends.
The longer-range potential  problems of declining  urban population,  increasing
expenditures,  and other economic  trends could adversely  affect localities and
require increasing State assistance in the future.
 
    (6) OTHER ISSUERS OF NEW YORK  MUNICIPAL OBLIGATIONS. There are a number  of
other  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
obligations backed by the full faith and credit of the State.
 
                                       53
<PAGE>
NEW YORK 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.  For cases  in which  two state  or local  brackets fall  within a federal
bracket, the higher state or local bracket is combined with the federal bracket.
The combined local, state and Federal  tax brackets shown reflect the fact  that
state  and local 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.
 
I.  COMBINED FEDERAL AND NEW YORK STATE INCOME TAXES
 
 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 $     0-100.0     21.5    %     6.37    6.69    7.01    7.32    7.64    7.96    8.28    8.60
                 100.0-114.7     22.5          6.45    6.77    7.10    7.42    7.74    8.06    8.39    8.71
    39.0- 94.3       0-100.0     33.5          7.52    7.89    8.27    8.65    9.02    9.40    9.77   10.15
                 100.0-114.7     34.5          7.63    8.02    8.40    8.78    9.16    9.54    9.92   10.31
                 114.7-150.0     35.0          7.69    8.08    8.46    8.85    9.23    9.62   10.00   10.38
                 150.0-172.1     34.0          7.58    7.95    8.33    8.71    9.09    9.47    9.85   10.23
    94.3-143.6       0-100.0     36.0          7.81    8.20    8.59    8.98    9.38    9.77   10.16   10.55
                 100.0-114.7     37.0          7.94    8.33    8.73    9.13    9.52    9.92   10.32   10.71
                 114.7-150.0     38.0          8.06    8.47    8.87    9.27    9.68   10.08   10.48   10.89
                 150.0-172.1     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
   143.6-256.5   114.7-150.0     42.5          8.70    9.13    9.57   10.00   10.43   10.87   11.30   11.74
                 150.0-172.1     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
                  Over 294.6     42.0    2     8.62    9.05    9.48    9.91   10.34   10.78   11.21   11.64
    Over 256.5   172.1-294.6     48.0          9.62   10.10   10.58   11.06   11.54   12.02   12.50   12.98
                  Over 294.6     45.5    3     9.17    9.63   10.09   10.55   11.01   11.47   11.93   12.39
</TABLE>
 
  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 $     0-100.0     21.5    %     6.37    6.69    7.01    7.32    7.64    7.96    8.28    8.60
                 100.0-114.7     22.0          6.41    6.73    7.05    7.37    7.69    8.01    8.33    8.65
    23.4- 56.6       0-100.0     33.5          7.52    7.89    8.27    8.65    9.02    9.40    9.77   10.15
                 100.0-114.7     34.0          7.58    7.95    8.33    8.71    9.09    9.47    9.85   10.23
    56.6-118.0       0-100.0     36.0          7.81    8.20    8.59    8.98    9.38    9.77   10.16   10.55
                 100.0-114.7     36.5          7.87    8.27    8.66    9.06    9.45    9.84   10.24   10.63
                 114.7-150.0     38.0          8.06    8.47    8.87    9.27    9.68   10.08   10.48   10.89
                 150.0-237.2     37.5          8.00    8.40    8.80    9.20    9.60   10.00   10.40   10.80
   118.0-256.5   114.7-150.0     43.0          8.77    9.21    9.65   10.09   10.53   10.96   11.40   11.84
                 150.0-237.2     42.5          8.70    9.13    9.57   10.00   10.43   10.87   11.30   11.74
                  Over 237.2     42.0    2     8.62    9.05    9.48    9.91   10.34   10.78   11.21   11.64
    Over 256.5    Over 237.2     45.5    3     9.17    9.63   10.09   10.55   11.01   11.47   11.93   12.39
</TABLE>
 
                                       54
<PAGE>
II. COMBINED FEDERAL, NEW YORK STATE AND NEW YORK CITY INCOME TAXES
 
 COMBINED MARGINAL TAX RATES FOR JOINT TAXPAYERS WITH FOUR PERSONAL EXEMPTIONS
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL      COMBINED
    FEDERAL      ADJUSTED       STATE,
    TAXABLE        GROSS         LOCAL                     TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME      AND 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 $     0-100.0     25.0    %     6.67    7.00    7.33    7.67    8.00    8.33    8.67    9.00
                 100.0-114.7     26.0          6.76    7.09    7.43    7.77    8.11    8.45    8.78    9.12
    39.0- 94.3       0-100.0     36.5          7.87    8.27    8.66    9.06    9.45    9.84   10.24   10.63
                 100.0-114.7     37.5          8.00    8.40    8.80    9.20    9.60   10.00   10.40   10.80
                 114.7-150.0     38.0          8.06    8.47    8.87    9.27    9.68   10.08   10.48   10.89
                 150.0-172.1     37.5          8.00    8.40    8.80    9.20    9.60   10.00   10.40   10.80
    94.3-143.6       0-100.0     39.5          8.26    8.68    9.09    9.50    9.92   10.33   10.74   11.16
                 100.0-114.7     40.0          8.33    8.75    9.17    9.58   10.00   10.42   10.83   11.25
                 114.7-150.0     41.0          8.47    8.90    9.32    9.75   10.17   10.59   11.02   11.44
                 150.0-172.1     40.0          8.33    8.75    9.17    9.58   10.00   10.42   10.83   11.25
                 172.1-294.6     42.5          8.70    9.13    9.57   10.00   10.43   10.87   11.30   11.74
   143.6-256.5   114.7-150.0     45.5          9.17    9.63   10.09   10.55   11.01   11.47   11.93   12.39
                 150.0-172.1     44.5          9.01    9.46    9.91   10.36   10.81   11.26   11.71   12.16
                 172.1-294.6     47.0          9.43    9.91   10.38   10.85   11.32   11.79   12.26   12.74
                  Over 294.6     44.5    2     9.01    9.46    9.91   10.36   10.81   11.26   11.71   12.16
    Over 256.5   172.1-294.6     50.5         10.10   10.61   11.11   11.62   12.12   12.63   13.13   13.64
                  Over 294.6     48.0    3     9.62   10.10   10.58   11.06   11.54   12.02   12.50   12.98
</TABLE>
 
  COMBINED MARGINAL TAX RATES FOR SINGLE TAXPAYERS WITH ONE PERSONAL EXEMPTION
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL      COMBINED
    FEDERAL      ADJUSTED       STATE,
    TAXABLE        GROSS         LOCAL                     TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME      AND 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 $     0-100.0     25.0    %     6.67    7.00    7.33    7.67    8.00    8.33    8.67    9.00
                 100.0-114.7     25.5          6.71    7.05    7.38    7.72    8.05    8.39    8.72    9.06
    23.4- 56.6       0-100.0     36.5          7.87    8.27    8.66    9.06    9.45    9.84   10.24   10.63
                 100.0-114.7     37.0          7.94    8.33    8.73    9.13    9.52    9.92   10.32   10.71
    56.6-118.0       0-100.0     39.5          8.26    8.68    9.09    9.50    9.92   10.33   10.74   11.16
                 100.0-114.7     39.5          8.26    8.68    9.09    9.50    9.92   10.33   10.74   11.16
                 114.7-150.0     41.0          8.47    8.90    9.32    9.75   10.17   10.59   11.02   11.44
                 150.0-237.2     40.5          8.40    8.82    9.24    9.66   10.08   10.50   10.92   11.34
   118.0-256.5   114.7-150.0     45.5          9.17    9.63   10.09   10.55   11.01   11.47   11.93   12.39
                 150.0-237.2     45.5          9.17    9.63   10.09   10.55   11.01   11.47   11.93   12.39
                  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     48.0    3     9.62   10.10   10.58   11.06   11.54   12.02   12.50   12.98
</TABLE>
 
<TABLE>
<S>         <C>
<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  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 the New York State supplemental income
tax based upon a taxpayer's New York State taxable income and New York State adjusted gross income. This supplemental tax results
in  an increased marginal state income  tax rate to the extent  a taxpayer's New York State  adjusted gross income ranges between
$100,000 and $150,000. The  table does not, however,  reflect the amendments to  the New York State  income tax law that  imposes
limitations  on the deductibility of itemized deductions. The application of the New York State limitation on itemized deductions
may result in a higher combined Federal, State and local tax rate than indicated in the table. The table assumes for this purpose
that a taxpayer's New York State adjusted income equals his Federal adjusted gross income.
      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>
 
                                       55
<PAGE>
    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.
 
                                       56
<PAGE>
   
NUVEEN TAX-EXEMPT UNIT TRUST
SCHEDULE OF INVESTMENTS AT DATE OF DEPOSIT
FEBRUARY 17, 1995
NEW YORK INSURED TRUST 231
(SERIES 785)
    
 
<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>
- ---------------------------------------------------------------------------------------------------------------------------
$   315,000      New York State Energy Research and Development      2004 at 102        AAA         Aaa     $       308,051
                   Authority, Pollution Control Refunding
                   Revenue Bonds (New York State Electric & Gas
                   Corporation Project), 1994 Series A, 6.05%
                   Due 4/1/34.
    185,000      New York Local Government Assistance                2003 at 102        AAA         Aaa             168,335
                   Corporation, Series 1993B Refunding Bonds,
                   5.50% Due 4/1/21. (Original issue discount
                   bonds delivered on or about April 6, 1993 at
                   a price of 93.643% of principal amount.)
    500,000      New York State Medical Care Facilities Finance      2004 at 102        AAA         Aaa             446,685
                   Agency, Mental Health Services Facilities
                   Improvement Revenue Bonds, 1994 Series A,
                   5.25% Due 8/15/14. (Original issue discount
                   bonds delivered on or about February 24, 1994
                   at a price of 94.832% of principal
                   amount.)(General Obligation Bonds.)
    500,000      New York State Medical Care Facilities Finance      2005 at 102        AAA         Aaa             512,555
                   Agency, New York Hospital FHA-Insured
                   Mortgage Revenue Bonds, 1994 Series A, 6.50%
                   Due 8/15/29. (Original issue discount bonds
                   delivered on or about January 12, 1995 at a
                   price of 94.014% of principal amount.)
    500,000      New York State Urban Development Corporation,       2004 at 102        AAA         Aaa             459,290
                   Correctional Facilities Revenue Bonds, 1993A
                   Refunding Series, 5.50% Due 1/1/16.
    500,000      Metropolitan Transportation Authority (New        2004 at 101 1/2      AAA         Aaa             489,820
                   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 94.871% of principal
                   amount.)
    500,000      Triborough Bridge and Tunnel Authority (New       2004 at 101 1/2      AAA         Aaa             419,790
                   York), General Purpose Revenue Bonds, Series
                   1994A, 5.00% Due 1/1/24.
    500,000      Commonwealth of Puerto Rico, Public Improvement   2004 at 101 1/2      AAA         Aaa             516,185
                   Bonds of 1994 (General Obligation Bonds),
                   6.50% Due 7/1/23.
- -----------                                                                                                 ---------------
$ 3,500,000                                                                                                 $     3,320,711
- -----------                                                                                                 ---------------
- -----------                                                                                                 ---------------
</TABLE>
 
See Notes to Schedules of Investments, page 68.
 
                                       57
<PAGE>
   
PENNSYLVANIA INSURED TRUST 194
    
 
   
    The  Portfolio of Pennsylvania  Insured Trust 194  consists of 6 obligations
issued by  entities located  in Pennsylvania  and one  obligation issued  by  an
entity  located in  the Territory  of Puerto  Rico. 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:  Dedicated-Tax Supported  Revenue, 1;  Electrical
System  Revenue, 1; Health Care Facility Revenue, 1; Municipal Lease 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.
    
 
   
    At  the  Date  of  Deposit,  the  average  maturity  of  the  Bonds  in  the
Pennsylvania Insured Trust is 26.3 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 28.6% of the  aggregate principal amount of  the Bonds in  the
Trust (accounting for approximately 26.1% 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.
    
 
    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 15,
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>
  $3,317,001       $9,094            $204,125      $3,307,970                 .52%
</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  Pennsylvania Insured Trust, less estimated expenses, is estimated to accrue
at the  rate  of  $.01572  per  Unit per  day  under  the  semi-annual  plan  of
distribution,  $.01566 per Unit per day under the quarterly plan of distribution
and $.01558 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.
    
 
                                       58
<PAGE>
    Details of interest distributions per Unit of the Pennsylvania 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
PENNSYLVANIA 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.............  $   .6855(1)                                              $  5.6089
                                                        --------  $.4674 every month  --------
Quarterly Distribution Plan...........  $   .6855(1)   $   .4698(2)   $  1.4094      $  1.4094    $  5.6409
Semi-Annual Distribution Plan.........  $   .6855(1)   $   .4716(3)                  $  2.8296    $  5.6599
- ----------------------------------------------------------------------------------------------------------------
<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--PENNSYLVANIA INSURED TRUST
 
    For a discussion of the Federal tax status of income earned on  Pennsylvania
Insured Trust Units, see Section 11.
 
    In  the opinion of  Dechert Price & Rhoads,  special Pennsylvania counsel to
the Series, under existing law:
 
        Units evidencing  fractional  undivided interests  in  the  Pennsylvania
    Insured  Trust  are  not  subject  to any  of  the  personal  property taxes
    presently in effect in Pennsylvania to the extent of that proportion of  the
    Trust  represented by Bonds issued by  the Commonwealth of Pennsylvania, its
    agencies and  instrumentalities,  or by  any  county, city,  borough,  town,
    township,  school  district,  municipality  and  local  housing  or  parking
    authority in the Commonwealth of Pennsylvania or issued by Puerto Rico,  the
    Virgin Islands, Guam or the Northern Mariana Islands ("Pennsylvania Bonds").
    The  taxes referred to  above include the County  Personal Property Tax, the
    additional personal property  taxes imposed on  Pittsburgh residents by  the
    School  District of Pittsburgh  and by the  City of Pittsburgh.  The City of
    Pittsburgh, the School  District of Pittsburgh  and Allegheny County  cannot
    impose  personal property taxes as of  January 1, 1995. Pennsylvania Insured
    Trust Units may  be taxable  under the Pennsylvania  inheritance and  estate
    taxes.
 
        The  proportion  of interest  income  representing interest  income from
    Pennsylvania Bonds distributed  to Unitholders of  the Pennsylvania  Insured
    Trust is not taxable under the Pennsylvania Personal Income Tax or under the
    Corporate  Net Income Tax imposed  on corporations by Article  IV of the Tax
    Reform Code. Nor will such interest be taxable under the Philadelphia School
    District Investment Income Tax imposed on Philadelphia resident individuals.
 
        The disposition by the Pennsylvania Insured Trust of a Pennsylvania Bond
    (whether by  sale, exchange,  redemption or  payment at  maturity) will  not
    constitute  a taxable event to a  Unitholder under the Pennsylvania Personal
    Income Tax if the Pennsylvania
 
                                       59
<PAGE>
    Bond was issued  prior to February  1, 1994. Further,  although there is  no
    published  authority on the  subject, counsel is  of the opinion  that (i) a
    Unitholder of the Pennsylvania Insured Trust  will not have a taxable  event
    under  the  Pennsylvania state  and local  income taxes  referred to  in the
    preceding paragraph  (other than  the  Corporate Net  Income Tax)  upon  the
    redemption  or sale of his Unit to  the extent that the Pennsylvania Insured
    Trust is then comprised  of Pennsylvania Bonds issued  prior to February  1,
    1994  and  (ii) the  dispositions  by the  Pennsylvania  Insured Trust  of a
    Pennsylvania Bond  (whether  by sale,  exchange,  redemption or  payment  at
    maturity)  will not  constitute a  taxable event  to a  Unitholder under the
    Corporate Net  Income Tax  or the  Philadelphia School  District  Investment
    Income  Tax if the Pennsylvania  Bond was issued prior  to February 1, 1994.
    (The School District tax  has no application to  gain on the disposition  of
    property held by the taxpayer for more than six months.)
 
        Gains  on the  sale, exchange, redemption,  or payment at  maturity of a
    Pennsylvania Bond issued on or after February 1, 1994, will be taxable under
    all of these taxes, as will gains on the redemption or sale of a unit to the
    extent that the Trust is comprised of Pennsylvania Bonds issued on or  after
    February 1, 1994.
 
ECONOMIC FACTORS--PENNSYLVANIA
 
    RISK   FACTORS--Prospective   investors   should   consider   the  financial
difficulties and pressures which the Commonwealth of Pennsylvania and certain of
its municipal subdivisions have undergone. Both the Commonwealth and the City of
Philadelphia have historically experienced significant revenue shortfalls. There
can be no assurance that the  Commonwealth will not experience further  declines
in  economic conditions or that portions  of the municipal obligations purchased
by the Fund  will not  be affected  by such  declines. Without  intending to  be
complete,  the following briefly  summarizes some of  these difficulties and the
current financial situation, as  well as some of  the complex factors  affecting
the financial situation in the Commonwealth. It is derived from sources that are
generally  available to investors  and is based in  part on information obtained
from various agencies in the Commonwealth. No independent verification has  been
made of the following information.
 
   
    STATE  ECONOMY--Pennsylvania  has been  historically  identified as  a heavy
industry state although that reputation  has changed recently as the  industrial
composition  of the Commonwealth  diversified when the  coal, steel and railroad
industries began to decline. The major new sources of growth in the Commonwealth
are in the  service sector, including  trade, medical and  the health  services,
education and financial institutions. The Commonwealth's agricultural industries
are  also an important component of  its economic structure, accounting for more
than $3.6 billion in crop and livestock products annually while agribusiness and
food related industries support $39 billion in economic activity annually.
    
   
    Employment within the  Commonwealth increased  steadily from  1984 to  1990.
From  1991 to  1994, employment  in the  Commonwealth declined  1.2 percent. The
growth in  employment experienced  in  the Commonwealth  during such  period  is
comparable  to the  growth in  employment in the  Middle Atlantic  region of the
United States. Non-manufacturing  employment in the  Commonwealth has  increased
steadily  since 1980  to its  1993 level of  81.6 percent  of total Commonwealth
employment.   Manufacturing,   which   contributed   18.4   percent   of    1993
non-agricultural  employment, has fallen behind both the services sector and the
trade sector as the largest single source of employment within the Commonwealth.
In 1993, the services sector accounted for 29.9 percent of all  non-agricultural
employment  in  the  Commonwealth  while the  trade  sector  accounted  for 22.4
percent.
    
 
                                       60
<PAGE>
   
    The Commonwealth recently experienced a  slowdown in its economy.  Moreover,
economic  strengths and weaknesses vary in  different parts of the Commonwealth.
In general,  heavy  industry  and  manufacturing  have  been  facing  increasing
competition from foreign producers. During 1993, the annual average unemployment
rate  in the Commonwealth was 7.0 percent compared to 6.8 percent for the United
States. For January 1994 the unadjusted unemployment rate was 6.5 percent in the
Commonwealth and 6.2 percent in the United States, while the seasonally adjusted
unemployment rate for the Commonwealth was 6.0 percent and for the United States
was 5.7 percent.
    
   
    STATE BUDGET--The  Commonwealth  operates under  an  annual budget  that  is
formulated and submitted for legislative approval by the Governor each February.
The  Pennsylvania  Constitution  requires that  the  Governor's  budget proposal
consist of three parts: (i) a  balanced operating budget setting forth  proposed
expenditures  and estimated revenues from all sources and, if estimated revenues
and available surplus are less than proposed expenditures, recommending specific
additional sources of revenue sufficient to  pay the deficiency; (ii) a  capital
budget  setting forth proposed expenditures to  be financed from the proceeds of
obligations of the  Commonwealth or its  agencies or from  operating funds;  and
(iii)  a financial plan for not less than the succeeding five fiscal years, that
includes for each year projected  operating expenditures and estimated  revenues
and  projected expenditures for capital projects.  The General Assembly may add,
change or delete  any items  in the  budget prepared  by the  Governor, but  the
Governor  retains veto  power over the  individual appropriations  passed by the
legislature. The Commonwealth's fiscal  year begins on July  1 and ends on  June
30.
    
 
    All  funds  received by  the Commonwealth  are  subject to  appropriation in
specific amounts by the  General Assembly or by  executive authorization by  the
Governor.  Total appropriations enacted  by the General  Assembly may not exceed
the ensuing  year's  estimated revenues,  plus  (less) the  unappropriated  fund
balance  (deficit) of the preceding year, except for constitutionally authorized
debt service payments. Appropriations from the principal operating funds of  the
Commonwealth  (the General  Fund, the Motor  License Fund and  the State Lottery
Fund)  are  generally  made  for  one  fiscal  year  and  are  returned  to  the
unappropriated  surplus of the fund if not spent or encumbered by the end of the
fiscal year. The Constitution specifies that a surplus of operating funds at the
end of a fiscal year must be appropriated for the ensuing year.
 
    Pennsylvania  uses  the  "fund"  method  of  accounting  for  receipts   and
disbursements. For purposes of government accounting, a "fund" is an independent
fiscal  and accounting entity  with a self-balancing  set of accounts, recording
cash and/or other resources together  with all related liabilities and  equities
that  are  segregated for  the  purpose of  carrying  on specific  activities or
attaining certain objectives in accordance with the fund's special  regulations,
restrictions  or  limitations. In  the Commonwealth,  over  150 funds  have been
established by  legislative  enactment or  in  certain cases  by  administrative
action  for the  purpose of  recording the  receipts and  disbursement of moneys
received by the Commonwealth.  Annual budgets are adopted  each fiscal year  for
the  principal operating  funds of  the Commonwealth  and several  other special
revenue funds. Expenditures  and encumbrances  against these funds  may only  be
made  pursuant to  appropriation measures  enacted by  the General  Assembly and
approved by the  Governor. The  General Fund, the  Commonwealth's largest  fund,
receives  all tax revenues, non-tax revenues and federal grants and entitlements
that are not specified  by law to  be deposited elsewhere.  The majority of  the
Commonwealth's  operating  and  administrative  expenses  are  payable  from the
General Fund. Debt service on all bond indebtedness of the Commonwealth,  except
that  issued for highway  purposes or for  the benefit of  other special revenue
funds, is payable from the General Fund.
 
                                       61
<PAGE>
    Financial information for the principal operating funds of the  Commonwealth
are maintained on a budgetary basis of accounting, which is used for the purpose
of  ensuring compliance with the enacted operating budget. The Commonwealth also
prepares annual  financial  statements  in accordance  with  generally  accepted
accounting principles ("GAAP"). Budgetary basis financial reports are based on a
modified  cash basis  of accounting  as opposed to  a modified  accrual basis of
accounting prescribed  by  GAAP. Financial  information  is adjusted  at  fiscal
year-end  to reflect appropriate accruals  for financial reporting in conformity
with GAAP.
 
    RECENT FINANCIAL  RESULTS--From fiscal  1984,  when the  Commonwealth  first
prepared  its financial  statements on  a GAAP  basis, through  fiscal 1989, the
Commonwealth reported a  positive unreserved-undesignated fund  balance for  its
governmental  fund types at each fiscal year end. Slowing economic growth during
1990, leading to a national economic recession beginning in fiscal 1991, reduced
revenue  growth  and   increased  expenditures  and   contributed  to   negative
unreserved-undesignated  fund balances  at the end  of the 1990  and 1991 fiscal
years. The  negative unreserved-undesignated  fund balance  was due  largely  to
operating  deficits in the General Fund and  the State Lottery Fund during those
fiscal years. Actions taken  during fiscal 1992 to  bring the General Fund  back
into  balance, including tax increases and expenditure restraints, resulted in a
$1.1 billion reduction to the unreserved-undesignated fund deficit for  combined
governmental  fund  types at  June 30,  1993, as  a result  of a  $420.4 million
increase in  the balance.  These gains  were produced  by continued  efforts  to
control  expenditure growth.  The Combined  Balance Sheet  as of  June 30, 1993,
showed total fund  balance and  other credits  for the  total governmental  fund
types  of $1,959.9 million, a  $732.1 million increase from  the balance at June
30, 1992. During  fiscal 1993,  total assets  increased by  $1,296.7 million  to
$7,096.4  million,  while  liabilities  increased  $564.6  million  to  $5,136.5
million.
 
    FISCAL 1991 FINANCIAL RESULTS--The Commonwealth experienced a $453.6 million
general fund  deficit  as of  the  end of  its  1991 fiscal  year.  The  deficit
reflected  higher than  budgeted expenditures,  below-estimate economic activity
and growth rates of economic indicators  and total tax revenue shortfalls  below
those assumed in the enacted budget.
 
    Rising   demands  on  state  programs  caused  by  the  economic  recession,
particularly for  medical  assistance  and cash  assistance  programs,  and  the
increased  costs  of special  education programs  and correction  facilities and
programs, contributed  to  increased  expenditures in  fiscal  1991,  while  tax
revenues  for  the  1991 fiscal  year  were  severely affected  by  the economic
recession. Total corporation tax receipts and sales and use tax receipts  during
fiscal  1991  were,  respectively, 7.3  percent  and 0.9  percent  below amounts
collected during fiscal 1990. Personal income tax receipts also were affected by
the recession but  not to  the extent  of the  other major  General Fund  taxes,
increasing only 2.0 percent over fiscal 1990 collections.
 
    A   number  of  actions  were  taken  throughout  the  fiscal  year  by  the
Commonwealth to mitigate  the effects of  the recession on  budget revenues  and
expenditures.  The  Commonwealth  initiated a  number  of  cost-saving measures,
including the  firing  of  2,000  state employees,  deferral  of  paychecks  and
reduction  of funds to state universities,  which resulted in approximately $871
million cost savings.
 
    FISCAL 1992 FINANCIAL RESULTS--Actions taken during fiscal 1992 to bring the
General Fund budget back into  balance, including tax increases and  expenditure
restraints  resulted in a $1.1 billion reduction for the unreserved-undesignated
fund deficit for  combined governmental fund  types and a  return to a  positive
fund  balance.  Total  General  Fund revenues  for  fiscal  1992  were $14,516.8
million,   which   is    approximately   22   percent    higher   than    fiscal
 
                                       62
<PAGE>
1991  revenues of  $11,877.3 million  due in  large part  to tax  increases. The
increased revenues funded  substantial increases in  education, social  services
and  corrections  programs.  As  a  result  of  the  tax  increases  and certain
appropriation lapses,  fiscal 1992  ended  with an  $8.8 million  surplus  after
having  started the year with an  unappropriated General Fund balance deficit of
$453.6 million.
 
    FISCAL 1993 FINANCIAL RESULTS--Fiscal 1993 closed with revenues higher  than
anticipated  and expenditures approximately as projected, resulting in an ending
unappropriated balance surplus of  $242.3 million. A  deduction in the  personal
income  tax  rate  in  July  1992 and  the  one-time  receipt  of  revenues from
retroactive corporate tax increases  in fiscal 1992  were responsible, in  part,
for the low growth in fiscal 1993.
 
    FISCAL  1994 FINANCIAL RESULTS--Commonwealth revenues during the 1994 fiscal
year totaled $15,210.7 million,  $38.6 million above  the fiscal year  estimate,
and  3.9 percent  over commonwealth  revenues during  the 1993  fiscal year. The
sales tax was an  important contributor to the  higher than estimated  revenues.
The  strength of collections from  the sales tax offset  the lower than budgeted
performance of the  personal income tax  that ended the  1994 fiscal year  $74.4
million below estimate. The shortfall in the personal income tax was largely due
to  shortfalls in income not subject  to withholding such as interest, dividends
and other income. Expenditures, excluding pooled financing expenditures and  net
of  all fiscal 1994 appropriation lapses, totaled $14,934.4 million representing
a 7.2 percent  increase over  fiscal 1993 expenditures.  Medical assistance  and
prisons  spending contributed to the rate of spending growth for the 1994 fiscal
year. The Commonwealth maintained an operating balance on a budgetary basis  for
fiscal  1994 producing  a fiscal  year ending  unappropriated surplus  of $335.8
million.
 
    FISCAL 1995 BUDGET--On June  16, 1994, the Governor  signed a $15.7  billion
general  fund budget, an  increase of over  3.9% from the  Fiscal 1994 budget. A
substantial  amount  of  the  increase   is  targeted  for  medical   assistance
expenditures, reform of the state-funded public assistance program and education
subsidies  to local  school districts. The  budget also  includes tax reductions
totaling an estimated $166.4 million benefiting principally low income  families
and  corporations. The fiscal 1995 budget  projects a $4 million fiscal year-end
unappropriated surplus.
 
    DEBT LIMITS AND OUTSTANDING DEBT--The Pennsylvania Constitution permits  the
issuance  of the following types  of debt: (i) debt  to suppress insurrection or
rehabilitate areas affected  by disaster; (ii)  electorate approved debt;  (iii)
debt for capital projects subject to an aggregate outstanding debt limit of 1.75
times  the annual average tax  revenues of the preceding  five fiscal years; and
(iv) tax anticipation notes payable in the fiscal year of issuance.
 
   
    Under the Pennsylvania Fiscal Code, the Auditor General is required annually
to certify  to  the  Governor  and  the  General  Assembly  certain  information
regarding  the  Commonwealth's indebtedness.  According to  the August  31, 1994
Auditor General certificate, the  average annual tax  revenues deposited in  all
funds  in the  five fiscal  years ended  June 30,  1994 was  approximately $16.5
billion, and therefore,  the net  debt limitation for  the 1995  fiscal year  is
$28.8  billion.  Outstanding net  debt totaled  $4.0 billion  at June  30, 1994,
approximately equal to the net  debt at June 30, 1993.  At August 31, 1994,  the
amount  of debt authorized by  law to be issued, but  not yet incurred was $15.0
billion.
    
 
    DEBT RATINGS--All outstanding general  obligation bonds of the  Commonwealth
are rated AA- by S&P and A1 by Moody's.
 
    CITY   OF   PHILADELPHIA--The   City   of   Philadelphia   (the   "City"  or
"Philadelphia")  is  the   largest  city  in   the  Commonwealth.   Philadelphia
experienced a series of general fund deficits
 
                                       63
<PAGE>
for  fiscal years 1988 through 1992 which  have culminated in the City's present
serious financial  difficulties.  In  its 1992  Comprehensive  Annual  Financial
Report, Philadelphia reported a cumulative general fund deficit of $71.4 million
for fiscal year 1992.
 
    In  June  1991, the  Pennsylvania  legislature established  the Pennsylvania
Intergovernmental Cooperation  Authority  ("PICA"), a  five-member  board  which
oversees  the  fiscal  affairs  of the  City  of  Philadelphia.  The Legislation
empowers PICA  to issue  notes and  bonds on  behalf of  Philadelphia, and  also
authorizes  Philadelphia to levy  a one-percent sales tax  the proceeds of which
would be used  to pay off  the bonds.  In return for  PICA's fiscal  assistance,
Philadelphia is required, among other things, to establish a five-year financial
plans   that  include  balanced  annual   budgets.  Under  the  legislation,  if
Philadelphia does  not comply  with such  requirements, PICA  may withhold  bond
revenues and certain state funding.
 
    At  this time, the City is operating  under a five-year fiscal plan approved
by PICA on April 6, 1992. Full implementation of the five-year plan was  delayed
due  to labor  negotiations that  were not  completed until  October 1992, three
months after the expiration  of the old  labor contracts. The  terms of the  new
labor  contracts are  estimated to cost  approximately $144.4  million more than
what was budgeted in the original five-year plan. An amended five-year plan  was
approved  by  PICA in  May  1993. The  Mayor's  latest update  of  the five-year
financial plan was approved by PICA on May 2, 1994.
 
   
    As of November 17, 1994, PICA has issued $1,296.7 million of its Special Tax
Revenue Bonds. In accordance with the enabling legislation, PICA was  guaranteed
a  percentage of the wage tax revenue expected to be collected from Philadelphia
residents to permit repayment of the bonds.
    
 
    In January 1993, Philadelphia anticipated  a cumulative general fund  budget
deficit  of $57 million for the 1993 fiscal year. In response to the anticipated
deficit, the Mayor unveiled a financial plan eliminating the budget deficit  for
the  1993 budget year through  significant service cuts that  included a plan to
privatize certain city  provided services. Due  to an upsurge  in tax  receipts,
cost-cutting  and additional  PICA borrowings,  Philadelphia completed  the 1993
fiscal year with a balanced general  fund budget. The audit findings for  fiscal
1993  show a surplus of  approximately $3 million of  the fiscal year ended June
30, 1993.
 
   
    In January 1994, the Mayor proposed a $2.3 billion city general fund  budget
that  included no  tax increases,  no significant service  cuts and  a series of
modest health  and welfare  program  increases. At  that  time, the  Mayor  also
unveiled  a $2.2 billion program  (the "Philadelphia Economic Stimulus Program")
designed to stimulate Philadelphia's economy and  stop the loss of 1,000 jobs  a
month.  The  unaudited preliminary  General Fund  balance as  of June  30, 1994,
estimates a surplus of approximately $15.4 million.
    
    The Standard & Poor's Corporation rating on Philadelphia general  obligation
bonds is "BB." The Moody's Investors Service rating is currently "Ba."
 
    LITIGATION--The  Commonwealth is  a party to  numerous lawsuits  in which an
adverse final decision could  materially affect the Commonwealth's  governmental
operations  and consequently its ability to pay debt service on its obligations.
The Commonwealth also faces tort claims  made possible by the limited waiver  of
sovereign immunity effected by Act 152, approved September 28, 1978.
 
                                       64
<PAGE>
PENNSYLVANIA 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      17.5   %     6.06    6.36    6.67    6.97    7.27    7.58    7.88    8.18
    39.0- 94.3       0-114.7      30.0         7.14    7.50    7.86    8.21    8.57    8.93    9.29    9.64
                 114.7-172.1      31.0         7.25    7.61    7.97    8.33    8.70    9.06    9.42    9.78
    94.3-143.6       0-114.7      33.0         7.46    7.84    8.21    8.58    8.96    9.33    9.70   10.07
                 114.7-172.1      34.0         7.58    7.95    8.33    8.71    9.09    9.47    9.85   10.23
                 172.1-294.6      36.5         7.87    8.27    8.66    9.06    9.45    9.84   10.24   10.63
   143.6-256.5   114.7-172.1      39.0         8.20    8.61    9.02    9.43    9.84   10.25   10.66   11.07
                 172.1-294.6      41.5         8.55    8.97    9.40    9.83   10.26   10.68   11.11   11.54
                  Over 294.6      39.0   2     8.20    8.61    9.02    9.43    9.84   10.25   10.66   11.07
    Over 256.5   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   3     8.70    9.13    9.57   10.00   10.43   10.87   11.30   11.74
</TABLE>
 
  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 $     0-114.7      17.5         6.06    6.36    6.67    6.97    7.27    7.58    7.88    8.18
    23.4- 56.6       0-114.7      30.0         7.14    7.50    7.86    8.21    8.57    8.93    9.29    9.64
    56.6-118.0       0-114.7      33.0         7.46    7.84    8.21    8.58    8.96    9.33    9.70   10.07
                 114.7-237.2      34.5         7.63    8.02    8.40    8.78    9.16    9.54    9.92   10.31
   118.0-256.5   114.7-237.2      39.5         8.26    8.68    9.09    9.50    9.92   10.33   10.74   11.16
                  Over 237.2      39.0   2     8.20    8.61    9.02    9.43    9.84   10.25   10.66   11.07
    Over 256.5    Over 237.2      42.5   3     8.70    9.13    9.57   10.00   10.43   10.87   11.30   11.74
<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>
 
                                       65
<PAGE>
    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.
 
                                       66
<PAGE>
   
NUVEEN TAX-EXEMPT UNIT TRUST
SCHEDULE OF INVESTMENTS AT DATE OF DEPOSIT
FEBRUARY 17, 1995
PENNSYLVANIA INSURED TRUST 194
(SERIES 785)
    
 
<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      Commonwealth of Pennsylvania, Certificates of       2003 at 102        AAA         Aaa     $       428,505
                   Participation, Series 1993A, 5.00% Due
                   7/1/15. (Original issue discount bonds
                   delivered on or about July 21, 1993 at a
                   price of 92.174% of principal amount.)
    500,000      Pennsylvania Intergovernmental Cooperation          2003 at 100        AAA         Aaa             468,285
                   Authority, Special Tax Revenue Bonds (City of
                   Philadelphia Funding Program), Series of
                   1993, 5.60% Due 6/15/15.
    500,000      Deer Lakes School District (Allegheny County,       2004 at 100        AAA         Aaa             508,420
                   Pennsylvania), General Obligation Bonds,
                   Series of 1995, 6.45% Due 1/15/19.
    500,000      Lehigh County Industrial Development Authority,     2004 at 102        AAA         Aaa             506,080
                   Pollution Control Revenue Refunding Bonds,
                   1994 Series B (Pennsylvania Power & Light
                   Company Project), 6.40% Due 9/1/29.
    500,000      City of Philadelphia, Pennsylvania, Water and       2003 at 102        AAA         Aaa             439,940
                   Wastewater Revenue Bonds, Series 1993, 5.25%
                   Due 6/15/23. (Original issue discount bonds
                   delivered on or about August 26, 1993 at a
                   price of 92.499% of principal amount.)
    500,000      Washington County Hospital Authority                2003 at 102        AAA         Aaa             458,680
                   (Commonwealth of Pennsylvania), Hospital
                   Revenue Bonds, Series of 1993 (The Washington
                   Hospital Project), 5.625% Due 7/1/23.
    500,000      Commonwealth of Puerto Rico, Public Improvement   2004 at 101 1/2      AAA         Aaa             516,185
                   Bonds of 1994 (General Obligation Bonds),
                   6.50% Due 7/1/23.
- -----------                                                                                                 ---------------
$ 3,500,000                                                                                                 $     3,326,095
- -----------                                                                                                 ---------------
- -----------                                                                                                 ---------------
</TABLE>
 
See Notes to Schedules of Investments, page 68.
 
                                       67
<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.
 
                                       68
<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 785:
    
 
   
       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  785
     (comprising Short  Intermediate  Insured Trust  39,  Colorado  Insured
     Trust  56, Massachusetts Insured  Trust 123, New  Jersey Insured Trust
     187, New York Insured Trust  231 and Pennsylvania Insured Trust  194),
     as   of  February  17,  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  785
     as  of  February  17,  1995,  in  conformity  with  generally accepted
     accounting principles.
    
 
                                                        ARTHUR ANDERSEN LLP
 
   
     Chicago, Illinois,
     February 17, 1995.
    
 
                                       69
<PAGE>
                            Statements of Condition
 
   
                    NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 785
    
 
   
 (Short Intermediate Insured Trust 39, Colorado Insured Trust 56, Massachusetts
                               Insured Trust 123,
   New Jersey Insured Trust 187, New York Insured Trust 231, and Pennsylvania
                               Insured Trust 194)
    
   
                            AS OF FEBRUARY 17, 1995
    
 
<TABLE>
<CAPTION>
                                              SHORT
                                           INTERMEDIATE         COLORADO        MASSACHUSETTS
                                             INSURED            INSURED            INSURED
    TRUST PROPERTY                           TRUST 39           TRUST 56          TRUST 123
<S>                                       <C>                <C>                <C>
                                          --------------     --------------     --------------
Sponsor's contracts to purchase
 Tax-Exempt Bonds, backed by an
 irrevocable letter of credit(1)(2).....  $    7,473,040     $    3,366,735     $    3,275,681
Accrued interest to February 17, 1995 on
  underlying Bonds(1)...................          48,045             54,364             29,803
                                          --------------     --------------     --------------
            Total.......................  $    7,521,085     $    3,421,099     $    3,305,484
                                          --------------     --------------     --------------
                                          --------------     --------------     --------------
   LIABILITY AND INTEREST OF UNITHOLDERS
LIABILITY:
    Accrued interest to February 17,
      1995 on underlying Bonds(3).......  $       48,045     $       54,364     $       29,803
                                          --------------     --------------     --------------
INTEREST OF UNITHOLDERS:
    Units of fractional undivided
      interest outstanding (Short
      Intermediate Insured Trust
      39--75,000; Colorado Insured Trust
      56 --35,000; Massachusetts Insured
      Trust 123-- 35,000)
      Cost to investors(4)..............  $    7,704,181     $    3,540,189     $    3,444,444
        Less: Gross underwriting
          commission(5).................        (231,141)          (173,454)          (168,763)
                                          --------------     --------------     --------------
    Net amount applicable to
      investors.........................  $    7,473,040     $    3,366,735     $    3,275,681
                                          --------------     --------------     --------------
            Total.......................  $    7,521,085     $    3,421,099     $    3,305,484
                                          --------------     --------------     --------------
                                          --------------     --------------     --------------
<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>
 
                                       70
<PAGE>
   
                            Statements of Condition
                            As of February 17, 1995
                                  (Continued)
    
 
<TABLE>
<CAPTION>
                                            NEW JERSEY          NEW YORK         PENNSYLVANIA
                                             INSURED            INSURED            INSURED
    TRUST PROPERTY                          TRUST 187          TRUST 231          TRUST 194
                                          --------------     --------------     --------------
<S>                                       <C>                <C>                <C>
Sponsor's contracts to purchase
 Tax-Exempt Bonds, backed by an
 irrevocable letter of credit(1)(2).....  $    3,355,776     $    3,320,711     $    3,326,095
Accrued interest to February 17, 1995 on
  underlying Bonds(1)...................          33,040             32,745             36,473
                                          --------------     --------------     --------------
            Total.......................  $    3,388,816     $    3,353,456     $    3,362,568
                                          --------------     --------------     --------------
                                          --------------     --------------     --------------
   LIABILITY AND INTEREST OF UNITHOLDERS
LIABILITY:
    Accrued interest to February 17,
      1995 on underlying Bonds(3).......  $       33,040     $       32,745     $       36,473
                                          --------------     --------------     --------------
INTEREST OF UNITHOLDERS:
    Units of fractional undivided
      interest outstanding (New Jersey
      Insured Trust 187-- 35,000; New
      York Insured Trust 231--35,000;
      Pennsylvania Insured Trust
      194--35,000)
      Cost to investors(4)..............  $    3,528,666     $    3,491,794     $    3,497,455
        Less: Gross underwriting
          commission(5).................        (172,890)          (171,083)          (171,360)
                                          --------------     --------------     --------------
    Net amount applicable to
      investors.........................  $    3,355,776     $    3,320,711     $    3,326,095
                                          --------------     --------------     --------------
            Total.......................  $    3,388,816     $    3,353,456     $    3,362,568
                                          --------------     --------------     --------------
                                          --------------     --------------     --------------
<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>
 
                                       71
<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  Unitholder 
    
 
                                      A-13
<PAGE>
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
<PAGE>
                      (THIS PAGE INTENTIONALLY LEFT BLANK)
 
                                      A-42
<PAGE>
                      (THIS PAGE INTENTIONALLY LEFT BLANK)
 
                                      A-43
<PAGE>
                      (THIS PAGE INTENTIONALLY LEFT BLANK)
 
                                      A-44
<PAGE>
 
<TABLE>
<C>                <S>        <C>
           NUVEEN             Tax-Exempt Unit Trusts
 
                           PROSPECTUS
                           250,000 Units
                           Short Intermediate Insured
                           Trust 39
                           Colorado Insured Trust 56
                           Massachusetts Insured Trust
                           123
                           New Jersey Insured Trust 187
                           New York Insured Trust 231
                           Pennsylvania Insured Trust
                           194
</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.
 
   
   785
    
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 Short
Intermediate Insured  Trust 39  which is  incorporated in  the Prospectus  dated
February  17,  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>                                             7,453,948
<INVESTMENTS-AT-VALUE>                                            7,473,040
<RECEIVABLES>                                                        48,045
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    7,521,085
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            48,045
<TOTAL-LIABILITIES>                                                  48,045
<SENIOR-EQUITY>                                                           0
<PAID-IN-CAPITAL-COMMON>                                                  0
<SHARES-COMMON-STOCK>                                                75,000
<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>                                                      7,473,040
<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>                                                 99.64
<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 Colorado
Insured Trust 56 which is incorporated in the Prospectus dated February 17, 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>                                             3,346,090
<INVESTMENTS-AT-VALUE>                                            3,366,735
<RECEIVABLES>                                                        54,364
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    3,421,099
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            54,364
<TOTAL-LIABILITIES>                                                  54,364
<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>                                                      3,366,735
<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>                                                 96.19
<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
Massachusetts Insured Trust 123  which is incorporated  in the Prospectus  dated
February  17,  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>                                             3,256,226
<INVESTMENTS-AT-VALUE>                                            3,275,681
<RECEIVABLES>                                                        29,803
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    3,305,484
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            29,803
<TOTAL-LIABILITIES>                                                  29,803
<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>                                                      3,275,681
<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>                                                 93.59
<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 New
Jersey Insured Trust 187 which is incorporated in the Prospectus dated  February
17, 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>                                             3,337,946
<INVESTMENTS-AT-VALUE>                                            3,355,776
<RECEIVABLES>                                                        33,040
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    3,388,816
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            33,040
<TOTAL-LIABILITIES>                                                  33,040
<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>                                                      3,355,776
<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>                                                 95.88
<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 New York
Insured  Trust 231  which is incorporated  in the Prospectus  dated February 17,
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>                                             3,307,444
<INVESTMENTS-AT-VALUE>                                            3,320,711
<RECEIVABLES>                                                        32,745
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    3,353,456
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            32,745
<TOTAL-LIABILITIES>                                                  32,745
<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>                                                      3,320,711
<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>                                                 94.88
<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
Pennsylvania Insured Trust  194 which  is incorporated in  the Prospectus  dated
February  17,  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>                                             3,317,001
<INVESTMENTS-AT-VALUE>                                            3,326,095
<RECEIVABLES>                                                        36,473
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    3,362,568
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            36,473
<TOTAL-LIABILITIES>                                                  36,473
<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>                                                      3,326,095
<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>                                                 95.03
<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 785 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 785 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 2/17/95.

 
                                NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 785
                                (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))
                                                      )
                                                      )2/17/95
___________________

*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>

785

                   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
2/17/95


                         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 785                                           February 17, 1995        
                                                                              
Item 1.  This Indenture relates to the Nuveen Tax-Exempt Unit Trust           
         Series 785.                                                          
                                                                              
Item 2.  The date of this Indenture is February 17, 1995.                     
                                                                              
Item 3.  Series 785 shall initially contain Trusts as follows:                
                                                                              
         (a)   Short Intermediate Insured Trust 39                            
         (b)   Colorado Insured Trust 56                                      
         (c)   Massachusetts Insured Trust 123                                
         (d)   New Jersey Insured Trust 187                                   
         (e)   New York Insured Trust 231                                     
         (f)   Pennsylvania Insured Trust 194                                 
                                                                              
                                                                              
Item 4.  Each Trust shall initially consist of the following number of Units: 
                                                                              
         (a)   Short Intermediate Insured Trust         75,000 Units          
         (b)   Colorado Insured Trust                   35,000 Units          
         (c)   Massachusetts Insured Trust              35,000 Units          
         (d)   New Jersey Insured Trust                 35,000 Units          
         (e)   New York Insured Trust                   35,000 Units          
         (f)   Pennsylvania Insured Trust               35,000 Units          
                                                                              
                                                                              
Item 5.  (a) The amount of the second distribution from the Interest          
             Account of the respective Trusts will be as follows:             
                                                                              
         ( 1)  Short Intermediate Insured Trust        $ .5940 per Unit       
         ( 2)  Colorado Insured Trust                  $ .6815 per Unit       
         ( 3)  Massachusetts Insured Trust             $ .6652 per Unit       
         ( 4)  New Jersey Insured Trust                $ .6850 per Unit       
         ( 5)  New York Insured Trust                  $ .6811 per Unit       
         ( 6)  Pennsylvania Insured Trust              $ .6855 per Unit       
                                                                              
         (b) The date of the second distribution from the Interest Account    
             of the respective Trusts will be as follows:                     
                                                                              
         ( 1)  Short Intermediate Insured Trust        April 15, 1995         
         ( 2)  Colorado Insured Trust                  April 15, 1995         
         ( 3)  Massachusetts Insured Trust             April 15, 1995         
         ( 4)  New Jersey Insured Trust                April 15, 1995         
         ( 5)  New York Insured Trust                  April 15, 1995         
         ( 6)  Pennsylvania 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)  Short Intermediate Insured Trust        April 1, 1995          
         ( 2)  Colorado Insured Trust                  April 1, 1995          
         ( 3)  Massachusetts Insured Trust             April 1, 1995          
         ( 4)  New Jersey Insured Trust                April 1, 1995          
         ( 5)  New York Insured Trust                  April 1, 1995          
         ( 6)  Pennsylvania 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)   Short Intermediate Insured Trust        April 1, 1995          
         (b)   Colorado Insured Trust                  April 1, 1995          
         (c)   Massachusetts Insured Trust             April 1, 1995          
         (d)   New Jersey Insured Trust                April 1, 1995          
         (e)   New York Insured Trust                  April 1, 1995          
         (f)   Pennsylvania 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)  Short Intermediate Insured Trust        $1.5756                
         ( 2)  Colorado Insured Trust                  $1.5526                
         ( 3)  Massachusetts Insured Trust             $1.6282                
         ( 4)  New Jersey Insured Trust                $1.6751                
         ( 5)  New York Insured Trust                  $1.6673                
         ( 6)  Pennsylvania Insured Trust              $1.6577                
                                                                              
         (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)  Short Intermediate Insured Trust                               
                                                                              
               Monthly Plan of Distribution                  $1.5756          
               Quarterly Plan of Distribution                $1.2556          
               Semi-Annual Plan of Distribution              $1.0656          
                                                                              
         ( 2)  Colorado Insured Trust                                         
                                                                              
               Monthly Plan of Distribution                  $1.5526          
               Quarterly Plan of Distribution                $1.2326          
               Semi-Annual Plan of Distribution              $1.0426          
                                                                              
         ( 3)  Massachusetts Insured Trust                                    
                                                                              
               Monthly Plan of Distribution                  $1.6282          
               Quarterly Plan of Distribution                $1.3082          
               Semi-Annual Plan of Distribution              $1.1182          
                                                                              
         ( 4)  New Jersey Insured Trust                                       
                                                                              
               Monthly Plan of Distribution                  $1.6751          
               Quarterly Plan of Distribution                $1.3551          
               Semi-Annual Plan of Distribution              $1.1651          
                                                                              
         ( 5)  New York Insured Trust                                         
                                                                              
               Monthly Plan of Distribution                  $1.6673          
               Quarterly Plan of Distribution                $1.3473          
               Semi-Annual Plan of Distribution              $1.1573          
                                                                              
         ( 6)  Pennsylvania Insured Trust                                     
                                                                              
               Monthly Plan of Distribution                  $1.6577          
               Quarterly Plan of Distribution                $1.3377          
               Semi-Annual Plan of Distribution              $1.1477          
                                                                              
                                                                              
                                                                              
                            ADDITIONAL SCHEDULES                              
                                                                              
                                                                              
                         BONDS INITIALLY DEPOSITED                            
                                                                              
                  NUVEEN TAX-EXEMPT UNIT TRUST SERIES 785                     
                                                                              
                                                                              
                                                                              
                                                                              
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:  Short Intermediate Insured Trust 39                     
         Schedule C:  Colorado Insured Trust 56                               
         Schedule D:  Massachusetts Insured Trust 123                         
         Schedule E:  New Jersey Insured Trust 187                            
         Schedule F:  New York Insured Trust 231                              
         Schedule G:  Pennsylvania Insured Trust 194                          


<PAGE>

EXHIBIT 3.1

(ON CHAPMAN AND CUTLER LETTERHEAD)

2/17/95


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

RE:  Nuveen Tax-Exempt Unit Trust, Series 785

Gentlemen:

    We have served as counsel for you, as depositor of Nuveen Tax-Exempt Unit
Trust, Series 785 (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. 33-57365) 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)

2/17/95

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

RE:  Nuveen Tax-Exempt Unit Trust, Series 785

Gentlemen:

    We have served as counsel for you, as Depositor of Nuveen Tax-Exempt Unit
Trust, Series 785 (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 785.

    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. 33-57365) 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 SHERMAN & HOWARD L.L.C. LETTERHEAD)

2/17/95


Nuveen Tax-Exempt Unit Trust,
Series 785
c/o United States Trust Company of
New York, Trustee
770 Broadway
New York, New York  10003

RE:  
    Colorado Insured Trust 56

Ladies and Gentlemen:

    We have acted as special counsel to the Nuveen Tax-Exempt Unit Trust, 
Series 785 (the "Fund") with respect to certain applications of the
income tax law of the State of Colorado to the above captioned Trust(s)
created as part of the Fund (the "Colorado Trust(s)") and to the holders of
certificates or registered holders of book entry positions evidencing
ownership of fractional undivided interest ("Units") in the Colorado Trust(s)
who are residents of the State of Colorado ("Colorado Unitholders").

    In this connection, we have examined the form of an opinion of Chapman and
Cutler, counsel for John Nuveen & Co. Incorporated, the Depositor, to be dated
today, as to the federal tax status of the several constituent trusts of the
Fund and the holders of Units, including the Colorado Trust(s) and the
Colorado Unitholders. Chapman and Cutler has advised us that its opinion, as
executed and delivered, will be in all material respects identical to such
form.  We have also examined such pertinent materials and matters of law as
we deemed necessary in order to enable us to express the opinions hereinafter
set forth.

    It is our understanding that a Colorado Trust will consist of
obligations which were issued by the State of Colorado or its political
subdivisions or by the United States or possessions of the United States,
including Puerto Rico, the Virgin Islands and Guam ("Bonds").  The following
opinion assumes that the Colorado Trust(s) will have no income other than
(i) interest income on the Bonds, (ii) insurance proceeds, if any, referred
to in paragraph (3) below, and (iii) gain on the disposition of such Bonds.

    Based on the foregoing and, with your permission, in reliance upon the
opinion of Chapman and Cutler referred to above, it is our opinion that
application of existing Colorado income tax law would be as follows:

    The Chapman and Cutler opinion concludes that each trust, including the
Colorado Trust(s), will be governed by the provisions  of subchapter J of
chapter 1, Internal Revenue Code of 1986 (the "Code").  Although there are no
Colorado income tax statutes similar to subchapter J of chapter 1 of the Code,
the Colorado statutory provisions generally operate to reach the same result
that is reached under the federal system.  The income, deduction, and credit
items directly reportable by the "owner" of a trust under the federal rules
are also directly reportable by that same person under Colorado rules.
Conversely, items of income, deduction, and credit not reportable for federal
purposes typically are not reported for Colorado purposes.  For resident
individuals, estates, and trusts, Colorado law imposes a tax on federal
taxable income, as defined in the Code, with specific modifications. For
corporations, a tax is imposed on net income derived from sources within
Colorado.  A corporation's net income is defined as federal taxable income,
again with certain modifications. There are two modifications relevent to
this opinion. First, interest income less amortization of premium on
obligations of any state or any politcal subdivision thereof must be added
to federal taxable income; however, interest income on obligations of the
State of Colorado or a political subdivision thereof which are issued on or
after May 1, 1980 is specifically excluded from this modification.  Interest
income on obligations of the State of Colorado or a political subdivision
thereof which were issued before May 1, 1980 is also excluded from this
modification to the extent that such interest is specifically exempt from
income taxation under the laws of the State of Colorado authorizing the
issuance of such obligations.  The second relevent modification is that
interest income on obligations of the United States and its possessions is
subtracted from federal taxable income to the extent it was included in
federal taxable income.

    Colorado also imposes on individuals, estates, and trusts an alternative
minimum tax based on the federal alternative minimum taxable income determined
pursuant to Section 55 of the Code.  As with the modifications to federal
taxable income pertaining to interest income on Colorado exempt obligations,
interest income on obligations of the State of Colorado and political
sudivisions thereof which are issued on or after May 1, 1980, or which were
issued prior to May 1, 1980 but have interest specifically exempt from income
taxation under the Colorado laws authorizing the issuance of such obligations,
is not included in the modification that otherwise requires that interest
income from obligations of states or political subdivisions thereof be added
to federal alternative minimum taxable income.  Furthermore, interest income
on obligations of the United States and its possessions is subtracted from
federal alternative minimum taxable income.

    Because Colorado income tax law is based upon the federal law and in light
of the opinion of Chapman and Cutler, the Colorado Trust(s) will not be
association(s) taxable as  corporation(s) for purposes of Colorado income
taxation.

<PAGE>

    With respect to Colorado Unitholders, in view of the relationship
between federal and Colorado tax computations described above and the opinion 
of Chapman and Cutler referred to above:

    1.   Each Colorado Unitholder will be treated as owning a share of
         each asset of the Colorado Unitholder's respective Colorado Trust for
         Colorado income tax purposes, in the proportion that the number of
         Units of such Colorado Trust held by the Unitholder bears to the
         total number of outstanding Units of the Colorado Trust, and the
         income of the Colorado Trust will therefore be treated as the income
         of each Colorado Unitholder under Colorado law in the proportion
         described;

    2.   Interest on Bonds that would not be included in the base subject to
         Colorado income tax or Colorado alternative minimum tax when paid
         directly to a Colorado Unitholder will not be included in the base
         subject to Colorado income tax or alternative minimum tax when
         received by a Colorado Trust and attributed to such Colorado
         Unitholder and when distributed to such Colorado Unitholder;

    3.   Proceeds paid under an insurance policy, if any, issued to the issuer
         of the Bonds involved, to the Depositor prior to deposit of the Bonds
         in a Colorado Trust, or to a Colorado Trust, which proceeds
         represent maturing interest on defaulted Bonds and which proceeds
         would not be included in the base subject to Colorado income tax or
         Colorado alternative minimum tax when paid directly to a Colorado
         Unitholder will not be included in the base subject to Colorado
         income and alternative minimum tax when received by a Colorado
         Trust and attributed to such Colorado Unitholder and when
         distributed to such Colorado Unitholder;

    4.   Each Colorado Unitholder will realize gain or loss taxable
         in Colorado when the Colorado Unitholder's respective Colorado
         Trust disposes of a Bond (whether by sale, exchange, redemption,
         or payment at maturity) or when the Colorado Unitholder redeems or
         sells Units at a price that differs from original cost as adjusted
         for amortization of bond discount or premium and other basis
         adjustments (including any basis reduction that may be required to
         reflect a Colorado Unitholder's share of interest, if any, accruing
         on Bonds during the interval between the Colorado Unitholder's
         settlement date and the date such Bonds are delivered to the Colorado
         Trust, if later);

    5.   Tax cost reduction requirements relating to amortization of bond
         premium may, under some circumstances, result in Colorado
         Unitholders realizing gain taxable in Colorado when their
         Units are sold or redeemed for an amount equal to or less than their
         original cost; and
 
    6.   If interest on indebtedness incurred or continued by a Colorado
         Unitholder to purchase Units in the Colorado Trust is not
         deductible for federal income tax purposes, it will not be
         deductible for Colorado income tax purposes.


    We have not examined any of the Bonds to be deposited in the Colorado
Trusts(s) and express no opinion as to whether the interest (or, if appli-
cable, insurance proceeds representing interest) on any such Bonds would in
fact be included in the base subject to Colorado income tax or Colorado
alternative minimum tax if directly received by a Colorado Unitholder.

    We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement (File No. 33-57365) relating to the Units referred
to above and to the use of our name and the reference to our firm in such
Registration Statement, and in the related Prospectus, under the "Tax Status"
heading for each Colorado Trust in the Fund.  In addition, we authorize United
States Trust Company of ew York to rely upon this opinion in its capacity
as Trustee of the Fund.

Very truly yours,


SHERMAM & HOWARD L.L.C.

<PAGE>

EXHIBIT 3.3

(ON EDWARDS & ANGELL LETTERHEAD)

2/17/95

Nuveen Tax-Exempt Unit Trust,
  Series 785
In care of John Nuveen & Co.
  Incorporated
333 West Wacker Drive
Chicago, IL  60606

Attention of James J. Wesolowski, Esq.
             Vice President, General Counsel
             and Secretary

United States Trust Company of New York,
as Trustee of Nuveen Tax-Exempt Unit Trust, Series 785
770 Broadway
New York, NY  10003

                 Re:   
                      Massachusetts Insured Trust 123

Dear Sirs:

    We have acted as special counsel, with respect to Massachusetts State and
local tax matters, to the above mentioned Trust(s) ("Trust(s)") of Nuveen Tax-
Exempt Unit Trust, Series 785 (the "Fund") concerning a Registration
Statement (No. 33-57365) on Form S-6 under the Securities Act of 1933, as
amended (the "Registration Statement"), covering the issuance by the Fund
of Units of fractional undivided interest in the Fund.

    We have not been furnished with a copy of the Registration Statement or
the prospectus, which is a part of the Registration Statement, relating to the
issuance by the Fund of the Units.  However, John Nuveen & Co. Incorporated
has authorized us to assume that the proposed offer and sale of the Units will
be carried out in that same manner and upon the same terms and conditions as
that described in the prospectus for the Nuveen Tax-Exempt Unit Trust, Series
351 - Massachusetts Trust 182, dated November 6, 1985.

    We have been furnished with a copy of the opinion of Chapman and Cutler
on the federal tax status of the Fund, its constituent Trusts and their
Unitholders.

    In addition, we have also examined applicable Massachusetts law and a
ruling of the Massachusetts Department of Revenue dated February 7, 1985,
relating to Multi-State Series 162.

     Based on the foregoing it is our opinion that under existing law and
administration of the affairs of the Trust(s):

     A.  For Massachusetts income tax purposes, each Trust will be treated
         as a corporate trust under Section 8 of Chapter 62 of the
         Massachusetts General Laws ("M.G.L.") and not as a grantor trust
         under Section 10(e) of M.G.L. Chapter 62.

     B.  The Trust(s) will not be held to be engaging in business in
         Massachusetts within the meaning of said Section 8 and will,
         therefore, not be subject to Massachusetts income tax.
     C.  Unitholders who are subject to Massachusetts income taxation
         under M.G.L. Chapter 62 will not be required to include their
         respective shares of the earnings of or distributions from the
         Trust(s) in their Massachusetts gross income to the extent that such
         earnings or distributions represent tax-exempt interest excludable
         from gross income for federal income tax purposes received by the
         Trust(s) on obligations issued by Massachusetts, its counties,
         municipalities, authorities, political subdivisions or
         instrumentalities or by Puerto Rico, the Virgin Islands, Guam,
         the Northern Mariana Islands or other possessions of the United
         States within the meaning of Section 103(c) of the Internal Revenue
         Code of 1986, as amended ("Obligations").

     D.  In the case of a Massachusetts Insured Trust, Unitholders who are
         subject to Massachusetts income taxation under M.G.L. Chapter 62
         will not be required to include their respective shares of the
         earnings of or distributions from such Trust in their Massachsetts
         gross income to the extent that such earnings or distributions are
         derived from the proceeds of insurance obtained by the Sponsor of
         such Trust or by the issuer or underwriter of an obligation held
         by such Trust that represent maturing interest on defaulted
         obligations held by the Trustee, if and to the same extent that
         such earnings or distributions would have been excludable from the
         gross income of such Unitholders if derived from interest paid by
         the issuer of the defaulted obligation.

     E.  Unitholders which are corporations subject to taxation
         under M.G.L. Chapter 63 will be required to include their
         respective shares of the earnings of or distributions from the
         Trust(s) in their Massachusetts gross income to the extent that such
         earnings or distributions represent interest from bonds, notes or
         indebtedness of any state, including Massachusetts, except for
         interest which is specifically exempted from such tax by the acts
         authorizing issuance of said Obligations.

     F.  Each Trust's capital gains and/or capital losses which are includable
         in the federal gross income of Unitholders who are
         subject to Massachusetts income taxation under M.G.L. Chapter 62,
         or Unitholders which are corporations subject to
         Massachusetts taxation under M.G.L. Chapter 63 will be included as
         capital gains and/or losses in the Unitholders' Massachusetts
         gross income, except for capital gain which is specifically exempted
         from taxation under such Chapters by the acts authorizing issuance of
         said Obligations.

     G.  Unitholders which are corporations subject to tax under
         M.G.L. Chapter 63 and which are tangible property corporations will
         not be required to include the Units when determining the value
         of their tangible property; such Unitholders which are
         intangible property corporations will be required to include the
         Units when determining their net worth.

     H.  Gains or losses realized on sales or redemptions of Units by
         Unitholders who are subject to Massachusetts income taxation
         under M.G.L. Chapter 62 or Unitholders which are corporations
         subject to Massachusetts taxation under M.G.L. Chapter 63 will be
         includable in their Massachusetts gross income.  In determining such
         gain or loss Unitholders will, to the same extent required for
         Federal tax purposes, have to adjust their tax bases for their Units
         for accrued interest received, if any, on Obligations delivered to
         the Trustee after the Unitholders pay for their Units, for
         amortization of premiums, if any, on Obligations held by the
         Trust(s), and for accrued original issue discount with respect to
         each Obligation which, at the time the Obligation was issued, had
         original issue discount.

     I.  The Units of the Trust(s) are not subject to any property tax levied
         by Massachusetts or any political subdivision thereof, nor to any
         income tax levied by any such political subdivision.  They are
         includable in the gross estate of a deceased Unitholder who is a
         resident of Massachusetts for purposes of the Massachusetts Estate
         Tax.

     The foregoing opinions are based upon present provisions of federal and
Massachusetts law, administrative interpretations thereof and court decisions.
With respect to Unitholders which are corporations subject to
Massachusetts taxation under M.G.L. Chapter 63, no opinion is rendered on the
includability of their respective shares of the earnings of or distributions
from the Trust(s) in their Massachusetts gross income to the extent that such
earnings or distributions represent interest from bonds, notes, or indebted-
ness of Puerto Rico, the Virgin Islands, Guam, the Northern Mariana Islands or
other possessions of the United States within the meaning of Section 103(c)
of the Internal Revenue Code of 1986, as amended.

     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 Prospectus included therein.

Very truly yours,



EDWARDS & ANGELL

<PAGE>

EXHIBIT 3.3

(ON PITNEY, HARDIN, KIPP & SZUCH LETTERHEAD)

2/17/95

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

RE:  Nuveen Tax-Exempt Unit Trust, Series 785
      
     New Jersey Insured Trust 187

Gentlemen:

    We have acted as special counsel, with respect to New Jersey state tax
matters, to Nuveen Tax-Exempt Unit Trust, Series 785 (the "Fund")
concerning a Registration Statement (No. 33-57365) on Form S-6 under the
Securities Act of 1933, as amended, covering the issuance by the Fund of units
of fractional undivided interest (the "Units") in several state trusts (the
"State Trusts"), one of which is the above-captioned trust ("New
Jersey Trust").  Such Units will be purchased by various investors
("Unitholders").

     The Fund is organized under a Trust Indenture and Agreement (the
"Indenture") of even date herewith between John Nuveen & Co. Incorporated (the
"Depositor") and United States Trust Company of New York (the "Trustee").
Each Unit of the New Jersey Trust represents a fractional undivided interest
in the principal and net income of the New Jersey Trust in the ratio of ten
Units for each one thousand dollars ($1,000) of principal amount of the
obligations initially acquired by the New Jersey Trust.  The New Jersey Trust
will be administered as a distinct entity with separate certificates,
investments, expenses, books and records.

    In acting as special counsel, we have examined such documents and records
with respect to the immediately preceding series of Nuveen Tax-Exempt Unit
Trust - Series which included a State Trust consisting primarily of Bonds
(herein defined) (the "Prior Series") as we deem necessary, including, but not
limited to, the Trust Indenture and Agreement (the "Prior Series Indenture")
and the Prospectus.  You have advised that the Indenture is identical in all
material respects to the Prior Series Indenture.  You have also advised that
the opinion of Messrs. Chapman and Cutler with respect to the Federal income
tax status of the Fund, its constituent State Trusts and its Unitholders is
in all material respects identical to the opinion issued by Messrs. Chapman
and Cutler for the Prior Series.

    We note that the assets of the New Jersey Trust will consist of
interest-bearing obligations issued by or on behalf of the State of New
Jersey, and counties, municipalities, authorities and other political
subdivisions thereof, and certain territories of the United States including
Puerto Rico, Guam, the Virgin Islands and the Northern Mariana Islands (the
"Bonds").  Distributions of the interest received by the New Jersey Trust will
be made to each Unitholder semi-annually unless the Unitholder elects to
receive such distributions on a monthly or quarterly basis.  In the
opinion of bond counsel to each issuer, the interest on all Bonds in the New
Jersey Trust is exempt from Federal income tax under existing law.

    We understand that on this date (the "Date of Deposit") the Depositor has
deposited with the Trustee the total principal amount of interest-bearing
obligations and/or contracts for the purchase thereof together with an
irrevocable letter of credit in the amount required for the purchase price and
accrued interest, if any, and an insurance policy or policies purchased by the
Depositor and issued by the Municipal Bond Investors Assurance Corporation
(the "Insurer") evidencing the insurance guaranteeing the timely payment of
principal and interest of some of the obligations comprising the corpus of the
Fund, as more fully set forth in the Preliminary Prospectus.  All other
obligations included in the deposit described above will be covered by
insurance obtained by the issuer of such obligations from the Insurer
guaranteeing timely payment of principal and interest.  Such insurance will
provide that the amount paid by the Insurer in respect of any Bond may
not exceed the amount of principal and interest due on the Bond and such
payment will in no event relieve the issuer from its continuing obligation
to pay such defaulted principal and interest in accordance with the terms of
the obligation.

    Section 2.04 of the Indenture provides that each State Trust is a separate
and distinct trust for all purposes, the assets of one State Trust may not be
commingled with the assets of any other State Trust, and that the expenses of
one State Trust shall not be charged against any other State Trust.  Section
2.04 further provides that the certificates representing the ownership of an
undivided fractional interest in one State Trust shall not be exchangeable for
certificates representing the ownership of an undivided fractional interest in
any other State Trust.

<PAGE>

     The Indenture provides further, among other things, that the Trustee
shall:

    A.  Collect all interest and monies payable to the New Jersey Trust, and
hold the funds collected in trust on behalf of the Unitholders of the
New Jersey Trust;

    B.  Set aside from such funds any amounts necessary for the reimbursement
of advances and for the payment of expenses, taxes and governmental charges in
respect of the New Jersey Trust;

    C.  Distribute all remaining amounts semi-annually, or monthly or
quarterly if so elected by a Unitholder, to the Unitholders in proportion
to their interest in the New Jersey Trust;

    D.  Redeem any certificates tendered for redemption by a Unitholder
provided that the Trustee has notified the Depositor of the tender and the
Depositor has failed to indicate within a time specified in the Indenture that
it will purchase the tendered certificates from the tendering Unitholder;

    E.  Sell or liquidate any or all Bonds at the sole direction of the
Depositor and at such price and time and in such manner as shall be determined
by the Depositor, provided that the Depositor has determined that any one or
more of certain conditions specified in the Indenture exists;

    F.  In connection with an offer made by an obligor of any of the Bonds to
issue new obligations, in exchange and substitution for any issue of Bonds
pursuant to a plan for the refunding or refinancing of such Bonds, pursuant to
the sole instruction of the Depositor in writing, reject such offer and either
hold or sell such Bonds, or accept or reject such offer or to take any other
action with respect thereto as the Depositor may deem proper; and

    G.  At the direction of the Depositor, acquire Replacement Bonds, as
defined in the Prospectus, to make up the original corpus of the New Jersey
Trust in the event of a failure to deliver any Bond that has been purchased
for the New Jersey Trust under a contract, including those Bonds purchased on
a "when, as and if issued" basis.

    The Trustee has no power of sale except (a) on order of the Depositor as
stated herein, (b) to provide funds, not otherwise available, to pay taxes,
charges, expenses, fees or indemnities, (c) in case of default on any of the
Bonds, but only after notification of the Depositor, and provided that the
Depositor has not, within 30 days of such notification, given any instructions
to sell or to hold, or has not taken any other action in connection with, such
Bonds, or (d) for the purpose of redeeming certificates tendered by any
Unitholder.  The Trustee has no  power to reinvest, except as stated in
Section 3.08 of the Indenture.  Such limited power of reinvestment is in
furtherance of the Trustee's obligation to protect the trust assets, and does
not constitute power to vary investments.

    The Indenture provides further, among other things, that the Unitholders:

    A.  May tender their certificate or certificates to the Trustee for
redemption except in limited circumstances;

    B.  Will not have any right to vote or in any manner otherwise control the
operation and management of the Fund, the New Jersey Trust, or the obligations
of the Depositor or Trustee;

    C.  May elect to receive distributions from the New Jersey Trust on a
monthly or quarterly basis;

    D.  May terminate the New Jersey Trust at any time by written consent of
100% of the Unitholders of the New Jersey Trust; and

    E.  Shall be under no liability to any third persons by reason of any
action taken by the Depositor or Trustee or any other Unitholder, or any
other cause whatsoever.

<PAGE>

    You have advised that, in the opinion of Messrs. Chapman and Cutler, for
Federal income tax purposes the Fund and New Jersey Trust will not be taxable
as a corporation or association but will be governed by the provisions of
Subchapter J (relating to trusts) of Chapter 1 of the Internal Revenue Code of
1986, as amended.  Each Unitholder will be considered the owner of a
pro rata portion of the New Jersey Trust and will be subject to tax on the
income therefrom under the provisions of Subpart E of Subchapter J of
Chapter 1 of the Internal Revenue Code of 1986, as amended.  The New Jersey
Trust itself will not be subject to Federal income taxes.  For Federal income
tax purposes, each item of trust income will have the same character in the
hands of the Unitholder as it would have in the hands of the Trustee.
Accordingly, to the extent that the income of the New Jersey Trust consists
of interest excludable from gross income under Section 103 of the Internal
Revenue Code of 1986, as amended, such income will be excludable from Federal
gross income of the Unitholder.  Furthermore, any proceeds paid under
the insurance policy or policies issued to the Trustee of the Fund with re-
spect to each Bond which represent 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
issuer of the defaulted obligations and the excludability from Federal
gross income of interest on Bonds which may be insured by  policies issued
directly to the respective Bond issuers will not be affected if the source
of any interest payment is from policy proceeds.

    Based on our examination of the Prior Series Indenture, your advice that
the  Indenture is identical in all material respects to the Prior Series
Indenture, your advice that the opinion of Messrs. Chapman and Cutler with
respect to the Federal income tax status of the Fund, its constituent State
Trusts and its Unitholders dated as of the date hereof is identical in all
material respects to its counterpart in the Prior Series, and, with respect
to Federal income tax matters, with your approval, relying solely upon the
opinion of Messrs. Chapman and Cutler, and our examination of such other
documents, records and matters of law as we deem necessary, we are of the
opinion that for New Jersey state and local tax purposes:

    1.  The New Jersey Trust will be recognized as a trust and not an
association taxable as a corporation.  The New Jersey Trust will not be
subject to the New Jersey Corporation Business Tax or the New Jersey
Corporation Income Tax.

    2.  With respect to the non-corporate Unitholders who are residents
of New Jersey, the income of the New Jersey Trust which is allocable to each
such Unitholder will be treated as the income of such Unitholder
under the New Jersey Gross Income Tax.  Interest on the underlying Bonds which
would be exempt from New Jersey Gross Income Tax if directly received by such
Unitholder will retain its status as tax-exempt interest when received
by the New Jersey Trust and distributed to such Unitholder.  Any
proceeds paid under the insurance policy or policies issued to the Trustee of
the Fund with respect to each Bond or under individual policies obtained by
issuers of Bonds which represent maturing interest on defaulted obligations
held by the Trustee will be exempt from New Jersey Gross 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.

    3.  A non-corporate Unitholder will not be subject to the New
Jersey Gross Income Tax on any gain realized either when the New Jersey Trust
disposes of a Bond (whether by sale, exchange, redemption, or payment at
maturity), when the Unitholder redeems or sells his Units, or upon
payment of any proceeds under the insurance policy or policies issued to
the Trustee of the Fund with respect to each Bond or under individual policies
obtained by issuers of Bonds which represent maturing principal on defaulted
obligations held by the Trustee.  Any loss realized on such disposition may
not be utilized to offset gains realized by such Unitholder on the
disposition of assets the gain on which is subject to the New Jersey Gross
Income Tax.

    4.  Units of the New Jersey Trust may be taxable on the death of a
Unitholder under the New Jersey Transfer Inheritance Tax Law or the New
Jersey Estate Tax Law.

    5.  If a Unitholder is a corporation subject to the New Jersey
Corporation Business Tax or New Jersey Corporation Income Tax, interest from
the Bonds in the New Jersey Trust which is allocable to such corporation will
be includable in its entire net income for purposes of the New Jersey
Corporation Business Tax or New Jersey Corporation Income Tax, less any
interest expense incurred to carry such investment to the extent such interest
expense has not been deducted in computing Federal taxable income.  Net gains
derived by such corporation on the disposition of the Bonds by the New Jersey
Trust or on the disposition of its Units will be included in its entire net
income for purposes of the New Jersey Corporation Business Tax or New Jersey
Corporation Income Tax.  Any proceeds paid under the insurance policy or
policies issued to the Trustee of the Fund with respect to each Bond or
under individual policies obtained by issuers of Bonds which represent
maturing interest or maturing principal on defaulted obligations held by the
Trustee will be included in its entire net income for purposes of the New
Jersey Corporation Business Tax or New Jersey Corporation Income Tax if, and
to the same extent as, such interest or proceeds would have been so included
if paid by the issuer of the defaulted obligations.

<PAGE>

    We have not examined any of the obligations to be deposited in the Fund,
and express no opinion as to whether the interest on any such obligations
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 Bonds
or the basis for bond counsel opinions.

    We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the reference to our firm and a summary of
this opinion included in such Registration Statement and the Prospectus
included therein.  In giving such consent we do not thereby admit that we
are in 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.

     Except as indicated in the immediately preceding paragraph hereof and
except with our prior written consent, this opinion may not be quoted in
whole or in part or otherwise referred to in any document or instrument
or be furnished to or relied upon by any person other than the addressee
and United States Trust Company of New York, as Trustee (including any
successor trustee).

Very truly yours,



Pitney, Hardin, Kipp & Szuch



<PAGE>

EXHIBIT 3.3


(ON EDWARDS & ANGELL LETTERHEAD)

2/17/95

Nuveen Tax-Exempt Unit Trust,
Series 785
In care of John Nuveen & Co. Incorporated
333 West Wacker Drive
Chicago, IL 60606

Attention of James J. Wesolowski, Esq.
             Vice President, General Counsel
             and Secretary

United States Trust Company of New York,
as Trustee of Nuveen Tax-Exempt Unit Trust,
Series 785
770 Broadway
New York, NY  10003

Re:  
    New York Insured Trust 231
     
     

Dear Sirs:

    We have acted as special counsel, with respect to New York State and New
York City tax matters, to the above Trusts(s) ("New York Trust(s)") of Nuveen
Tax-Exempt Unit Trust, Series 785 (the "Fund") concerning a
Registration Statement (No. 33-57365) on Form S-6 under the Securities Act of
1933, as amended (the "Registration Statement"), covering the issuance by the
New York Trusts(s) of units of fractional undivided interest in the New York
Trust(s)( "Units").
    We have not been furnished with a copy of the Registration Statement or
the prospectus, which is a part of the Registration Statement, relating to the
issuance by the New York Trust(s) of the Units.  However, John Nuveen & Co.
Incorporated has authorized us to assume that the proposed offer and sale of
the Units will be carried out in that same manner and upon the same terms and
conditions as that described in the prospectus for the Nuveen Tax Exempt Unit
Trust, Insured Series 193, dated May 19, 1989, which we were furnished and did
examine. In the case of a Fund which contains a New York Insured Trust or
New York Intermediate Insured Trust, we also were not furnished the
Insurance Agreement (the "Policy") between the Municipal Bond Investors
Assurance Corporation (the "Insurer"), the Depositor and the Trustee.
However, John Nuveen & Co. Incorporated has authorized us to
assume that the Policy will be implemented at the closing of the Trust and
be in substance and form materially similiar to the Policy applicable to
New York Insured Trust 108, which we were furnished and did examine.

    We have not been furnished with a copy of the Opinion of Chapman & Cutler
on the Federal Tax status of the Fund, its constituent Trusts and their
Unitholders.  However, John Nuveen & Co. Incorporated has authorized us to
assume that such Opinion will be in substance and form materially similar to
that which was issued in connection with Nuveen Tax Exempt Unit Trust, Insured
Series 193 dated May 19, 1989, which we were furnished and did examine.

    Based on the foregoing, we are of the opinion that, for purposes of New
York State and New York City franchise taxes, a New York Trust will be a
trust not an association taxable as a corporation; the proposed activities
of a New York Trust will not constitute doing business within the meaning
of section 208.1 of the New York Tax Law or section R46-3.0 of the N.Y.C.
Administrative Code; a New York Trust will not be subject to New York State
or New York City franchise tax imposed on business corporations; a New York
Trust will not be subject to the unincorporated business income tax imposed
by Article 23 of the N.Y. Tax Law or Chapter 46, Title S of the N.Y.C.
Administrative Code; and the income of a New York Trust will be treated as
income of the Unitholders.

    We are further of the opinion that, under existing laws and
administration of the affairs of the New York Trust(s):

    (A)  Interest on obligations issued by New York State, a political
subdivision thereof, Puerto Rico, the Virgin Islands, Guam, the Northern
Mariana Islands, or other possessions of the United States within the meaning
of Section 103(c) of the Internal Revenue Code of 1986, as amended,
("Obligations") which would be exempt from New York State or New York City
personal income tax if directly received by a Unitholder, will retain its
status as tax-exempt interest when received by a New York Trust and
distributed to such Unitholder;

    (B) Interest (less amortizable premium, if any) derived
from a New York Trust by a Unitholder who is a resident of New York State
(or New York City) in respect of Obligations issued by states other than New
York (or their political subdivisions) will be subject to New York State
(or New York City) personal income tax;

<PAGE>


    (C) A Unitholder who is a resident of New York State (or New York City)
will be subject to New York State (or New York City) personal income tax with
respect to gains realized when Obligations held in the Unitholder's respective
New York Trust are sold, redeemed or paid at maturity or when the Unitholder's
Units are sold or redeemed; such gain will equal the proceeds of sale,
redemption or payment less the tax basis of the Obligation or Unit
(adjusted to reflect (a) the amortization of premium or discount (if any) on
Obligations held by the New York Trust, (b) accrued original issue discount
with respect to each Obligation which, at the time the Obligation was issued,
had original issue discount, and (c) the deposit of Obligations with accrued
interest in the New York Trust after the Unitholder's settlement date);

    (D) Interest or gain from a New York Trust derived by a
Unitholder who is not a resident of New York State (or New York City)
will not be subject to New York State (or New York City) personal income
tax, unless the Units are property employed in a business, trade,
profession or occupation carried on in New York State (or New York City);

    (E)  In the case of a New York Insured Trust or New York Intermediate
Insured Trust, amounts paid under the Policies representing maturing interest
on defaulted Obligations held by the Trustee in the Trust will be excludable
from New York State and New York City income if, and to the same extent as,
such interest would have been excludable if paid by the respective
issuer; and

    (F) Amounts distributable from a New York Trust which are, pursuant to
a Unitholder's election, automatically reinvested in Nuveen Municipal
Bond Fund, Inc. will be treated as if actually distributed to and reinvested 
by such Unitholder.

    Because of the requirement that tax cost basis be adjusted as discussed in
(C) above, under some circumstances a Unitholder may realize taxable
gain when his Units are sold or redeemed for an amount equal to or
less than his original cost.

    Although interest on Obligations issued by New York (or a political
subdivision thereof) would generally be exempt from New York State and
New York City tax, a special limitation may apply with respect to private
activity bonds which are not qualified bonds within the meaning of section 
103(b)(1) of the Internal Revenue Code of 1986, as amended.  The interest 
on such bonds, to the extent received by a Unitholder who is a "substantial 
user" (or person related to such user) of the facilities financed by such 
bonds, will not be exempt from New York State and New York City tax for any 
period during which such bonds are beneficially held by such "substantial user" 
or "related person".

    As an additional matter, if borrowed funds are used to purchase Units
in a New York Trust, all (or part) of the interest on such indebtedness will
not be deductible for New York State and New York City tax purposes.  The
purchase of Units may be considered to have been made with borrowed funds even
though such funds are not directly traceable to the purchase of Units in any
New York Trust.

    We are further of the opinion that, for purposes of the New York State and
New York City franchise tax on corporations, Unitholders which are
subject to such tax will be required to include in their entire net income any
interest or gains distributed to them in respect of obligations of any state
or political subdivision thereof, including New York.  No opinion is rendered
on the includability in entire net income of interest distributed to such
Unitholders in respect of obligations issued by Puerto Rico, the Virgin
Islands, Guam, the Northern Mariana Islands or other possessions of the
United States within the meaning of Section 103(c) of the Internal Revenue
Code of 1986, as amended.

    The foregoing opinions are based upon present provisions of Federal,
New York State and New York City law, administrative interpretations thereof
and court decisions.

    In connection with this offering, we have not examined any of the
obligations to be deposited in the New York Trust(s), and express no opinion
whether the interest on any such obligations is, in fact, exempt from Federal,
New York State, or New York City income taxation, or that such interest would 
be tax-exempt under Federal, New York State, or New York City law if directly
received by a Unitholder, nor have we made any review of the proceedings
relating to the issuance of any such obligations.

    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 Prospectus included therein.

Very truly yours,



EDWARDS & ANGELL

<PAGE>

EXHIBIT 3.3


(On Dechert Price & Rhoads Letterhead)

2/17/95


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

RE:  Nuveen Tax-Exempt Unit Trust, Series 785
      
     Pennsylvania Insured Trust 194

Gentlemen:

    You have requested our opinion as to the Pennsylvania tax aspects of the
above-captioned Trust(s) (the "Pennsylvania Trust(s)") which is (are) a part
of the Nuveen Tax-Exempt Unit Trust Series 785 ("Fund").  The Fund is
organized under the Trust Indenture and Agreement, of even date, between John
Nuveen & Co. Incorporated, as Depositor, and United States Trust Company of
New York, as Trustee.  The Fund will contain several trusts, including the
Pennsylvania Trust(s), which will issue Units of fractional undivided
interests.  The Units will be purchased by various investors ("Unit Holder").
Each Unit of the Pennsylvania Trust(s) represents a fractional undivided
interest in the principal and net income of such Trust(s) in the ratio of ten
Units for each $1,000 of value of the obligations initially acquired by such
Trust(s).  Each Pennsylvania Trust will be administered as a distinct entity
with separate certificates, investments, expenses, books and records.
 
    The proceeds of the sale of the Units will be invested primarily in
interest-bearing obligations issued by or on behalf of the Commonwealth of
Pennsylvania, its agencies and instrumentalities, or political subdivisions
thereof, including any county, city, borough, town, township, school disrict,
municipality, and local housing or parking authority in the Commonwealth of
Pennsylvania or issued by Puerto Rico, the Virgin Islands, Guam or the
Northern Mariana Islands ("Bonds").  Distributions of the interest received by
the Trust will be made semi-annually unless the Unit Holder elects otherwise.
In the opinion of bond counsel to each issuer, the interest on all bonds in
the Trust is exempt fromn federal income tax under existing law.

    You have advised us that for federal income tax purposes each Pennsylvania
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.  Each Unit Holder will be considered the owner of a pro
rata portion of the Unit Holder's respective Pennsylvania Trust and will be
subject to tax on the income therefrom under the provisions of Subpart E of
Subchapter J of Chapter 1 of the Internal Revenue Code of 1986. A Pennsylvania
Trust itself will not be subject to federal income taxes. For federal income
tax purposes, each item of trust income will have the same character in the
hands of a Unit Holder as it would have in the hands of the Trustee.
Accordingly, to the extent that the income of a Pennsylvania Trust consists of
interest excludable from gross income under Section 103 of the Internal
Revenue Code of 1986, such income will be excludable from federal gross income
of the Unit Holder.

    Based upon the above facts, it is our opinion that for Pennsylvania state
and local tax purposes, a Pennsylvania Trust will be recognized as a trust not
taxable as a corporation.  It will, therefore, not be subject to the 
Pennsylvania Capital Stock/Franchise Tax or the Pennsylvania Corporate Net
Income Tax.  Since all of the income of a Trust is either itself income exempt
from Pennsylvania Personal Income Tax, as described below, or is required by 
the terms of the Trust to be distributed to the holders of Units, a Trust 
should not be subject to Pennsylvania Personal Income Tax.  The Philadelphia
School District Investment Income Tax described below, is not imposed on 
trusts.

    Various personal property taxes are in effect in Pennsylvania, however, 
each of them exempts, inter alia, Bonds, cash, checking and savings accounts 
in and certificates of deposit issued by commercial banks, savings 
institutions or trust companies and United States Treasury obligations.  In
general, these taxes apply to a specified list of items of intangible 
personal property including, inter alia, mortgages and other evidences of
indebtedness and shares of stock issued by business corporations not doing
business in Pennsylvania.  The taxes referred to above include the County 
Personal Property Tax imposed on residents of Pennsylvania by the Act of 
June 17, 1913, P.L. 507, as amended, the additional personal property taxes 
imposed on Pittsburgh residents by the School District of Pittsburgh under 
the Act of June 20, 1947, P.L. 733, as amended, and by the City of Pittsburgh 
by Ordinance No. 599 of December 28, 1967, under the Act of December 31, 1965,
P.L. 1257, and any additional personal property taxes that the School District
of Philadelphia may reimpose on Philadelphia residents under the authority 
contained in the Act of May 23, 1949, P.L. 1676, as amended.  Units evidencing 
fractional undivided interests in a Pennsylvania Trust will not be subject to 
any of these personal property taxes to the extent of that proportion of a 
Pennsylvania Trust represented by Bonds and other exempt assets. Only that 
proportion of the Units represented by taxable assets will be subject to the 
personal property taxes.  Pennsylvania Trust Units may be taxable under the 
Pennsylvania inheritance and estate taxes.
 
    The interest and gain from obligations issued by the Commonwealth of
Pennsylvania or by its political subdivisions or by any public authority of
either are exempt from tax under the Act of August 31, 1971, P.L. 395, 
Act No. 94.  However, that Act was repealed by the Act of December 3, 1993,
P.L. 473, Act No. 68 ("Act 68 of 1993") with respect to obligations issued
on or after February 1, 1994.  Pursuant to Act 68 of 1993, profits, gains or
income derived from the sale, exchange or other disposition of exempt 
government obligations issued after February 1, 1994 will be subject to
state or local taxation although interest and "income" derived from the
exempt obligations will continue to be exempt from all state and local 
taxation.  Therefore, the proportion of income representing interest from 
Bonds distributable to Unit Holders is not taxable under the Pennsylvania
Personal Income Tax imposed by Article III of the Pennsylvania "Tax Reform
Code of 1971", as amended by the Act of August 31, 1971, P.L. 362, Act No. 93,
or under the Corporate Net Income Tax imposed on corporations by Article IV of
the Tax Reform Code.  Similarly, such interest will not be taxable under the 
Philadelphia School District Investment Income Tax imposed on

<PAGE>

Philadelphia resident individuals under the authority of the Act of August 9,
1963, P.L. 640, as implemented by Section 19-1804 of the Philadelphia Code,
as amended, and resolutions of the Board of Education of the School District
of Philadelphia made pursuant to the ordinances, and such interest will not be
subject to any of the taxes on net income from business activities in 
Philadelphia under Philadelphia Code Sections 19-1500 and 19-2600, imposing
a Net Profits Tax and a Business Privilege Tax respectively.  The City and
School District of Pittsburgh do not impose any taxes on unearned income.
 
    Under the Pennsylvania Personal Income Tax Law, personal income tax is
imposed upon the following specified classes of income:  (1) compensation for
services, (2) net profits from the operation of a business, profession, or 
other activity, (3) net gains or income from the disposition of property, (4) 
net gains or income in the form of rents and royalties, (5) dividends, (6) 
interest from obligations not otherwise exempt, (7) gambling and lottery
winnings, (8) net gains or income from estates or trusts which fall under any 
of the preceding classifications.  Although there is no published authority
on the question, it is our opinion that any insurance proceeds paid in lieu of
interest on defaulted tax-exempt obligations will be exempt from Pennsylvania 
Personal Income Tax either as payment in lieu of tax-exempt interest or as 
payments of insurance proceeds which are not included in any of the classes 
of income specified as taxable under the Pennsylvania Personal Income Tax 
Law.  Since Pennsylvania Corporate Net Income Tax is imposed upon the 
corporation's net income for federal income tax purposes, because such
insurance proceeds will be excluded from the federal income tax base, such
proceeds will not be subject to the Pennsylvania Corporate Net Income Tax.
Finally, since proceeds from insurance policies are expressly excluded from
the Philadelphia School District Investment Income Tax, insurance proceeds
paid to replace defaulted payments under any Bonds held by the Pennsylvania
Trust(s) will not be subject to this tax.

    Under Act 68 of 1993, a Unit Holder's share of gain upon disposition of a 
Bond issued on or after February 1, 1994 by the Pennsylvania Trust, whether 
by sale, exchange, redemption or payment at maturity, will be taxable 
under the Pennsylvania Personal Income Tax.  Gains on the disposition of Bonds
issued before February 1, 1994 will continue to be exempt.  See 72 P.S. Section
7303(a)(3) and 61 Pa. Code Section. 121.9(b)(3).  While there is no published 
authority with respect to the treatment of such gains for purposes of the 
Philadelphia School District Investment Income Tax, it is our opinion that
gains upon dispositions of Bonds issued before February 1, 1994 are exempt from 
this tax under Act of August 31, 1971, P.L. 395, Act No. 94, and, if the 
question were litigated, the Pennsylvania courts should so hold.  Gains on the 
disposition of Bonds issued on or after February 1, 1994 will be taxable.  
In any event, the Philadelphia School District Investment Income Tax has no
application to any gain on the disposition of property held for more than
six months. 

    In C.C. Collings & Co., Inc. v. Commonwealth of Pennsylvania, 514 A.2d 1373
(1986), and two related cases, the Supreme Court of Pennsylvania held that 
gains or losses from the sale of obligations of the Commonwealth of 
Pennsylvania, its political subdivisions, instrumentalities and agencies are 
not subject to the Corporate Net Income Tax.  Profits, gains or income
derived from the sale, exchange or other disposition of those exempt 
obligations issued on or after February 1, 1994, however, will be subject
to tax pursuant to Act 68 of 1993.  

    There is no published authority under any of the Pennsylvania state and
local income taxes described above with respect to gain from the redemption
or sale of a Unit.  To the extent that such gain represents the
Unit Holder's share of any unrealized gain on the Bonds issued before 
February 1, 1994 and held by the Trust, it is our opinion that such gain is 
exempt from the above-described Pennsylvania state and local income taxes and, 
if the question were litigated, the Pennsylvania courts should so hold.  To the
extent that such gain is attributable to unrealized gain on Bonds issued on 
or after February 1, 1994, such gain will be taxable under such taxes.  In any
event, the Philadelphia School District Investment Income Tax has no 
application to any gain on the disposition of property held for more than six 
months.
 
    Interest on obligations of Puerto Rico, the Virgin Islands, Guam, or the
Northern Mariana Islands is, under federal law, exempt from taxation by states
and municipalities.  Federal law does not expressly exclude from taxation gain
realized upon the disposition of such obligations.  Therefore, a disposition
of such obligations by a Pennsylvania Trust could be a taxable event to a
Holder under each of the Pennsylvania state and local income taxes discussed
in the preceding paragraphs.  See Willcuts v. Bunn, 282 U.S. 216 (1931); U.S.
v. Stewart, 311 U.S. 60 (1940).  Similarly, to the extent that gain on the
redemption or sale of a Unit represents unrealized gain on such obligations
held by a Pennsylvania Trust, such gain could be taxable. 

    We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement (No. 33-57365) relating to the Units referred to
above, and to the reference to our firm as special Pennsylvania tax counsel in
said Registration Statement and in the related Prospectus.

Very truly yours,


DECHERT PRICE & RHOADS


<PAGE>

EXHIBIT 4.1

(ON STANDARD & POOR'S CORPORATION LETTERHEAD)

2/17/95

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

RE: Nuveen Tax-Exempt Unit Trust, Series 785

Gentlemen:

    This is in response to your requests regarding the above-
captioned fund which consists of separate underlying unit investment trusts
(the "trusts"), SEC file # 33-57365.

    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 solely 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 attached 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' rating to
the units of each insured trust and a 'AAA' rating to the securities contained
in each insured 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 trust's purchase price
will reduce payment to the unit holders of the interest and 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 the name of Standard & 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
amount of time after the closing or should they not conform to the
certification received by us, we reserve the right to nullify the ratings.

Very truly yours,

STANDARD & POOR'S CORPORATION


 By Vincent S. Orgo



<PAGE>

EXHIBIT 4.2

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

2/17/95

John Nuveen & Company
333 West Wacker Drive
Chicago, IL 60606-1286

RE:  Nuveen Tax Exempt Unit Trust, Series 785

Gentlemen:

      We have examined Registration Statement File No. 33-57365 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 785
                               File No. 33-57365


    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 2/17/95,
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 - 6.  Essential information for each of the Trusts, including
applicable footnotes, has been completed for this Series.

     PAGES 6 - 7.  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 9 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

2/17/95


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