NUVEEN TAX EXEMPT UNIT TRUST SERIES 817
487, 1995-08-10
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<PAGE>


                                                      File No. 33-60961
                                                      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 817

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:  Eric F. Fess
                             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.

*Previously Paid
______
          Check box if it is proposed that this filing will become effective
  X       on 8/10/95 at 1:30 p.m. pursuant to Rule 487.
______


<PAGE>

                 NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 817

                             Cross-Reference Sheet

                     Pursuant to Rule 404(c) of Regulation C
                        under the Securities Act of 1933

               (Form N-8B-2 Items Required by Instruction 1 as
                           to Prospectus on Form S-6)


FORM N-8B-2                                      FORM S-6
ITEM NUMBER                                      HEADING IN PROSPECTUS

    I.   ORGANIZATION AND GENERAL INFORMATION

1.  (a)  Name of trust                    )   Prospectus Cover Page
    (b)  Title of securities issued       )

2.  Name and address of Depositor         )23 Information About the Sponsor

3.  Name and address of Trustee           )22 Information About the Trustee

4.  Name and address of principal         )23 Information About the Sponsor
    Underwriter                           )

5.  Organization of trust                 ) 1 What Is The Nuveen Tax-Exempt
                                          )   Unit Trust?

6.  Execution and termination of          ) 1 What Is The Nuveen Tax-Exempt
    Trust Agreement                       )   Unit Trust?
                                          )22 Information About the Trustee
                                          )24 Other Information

7.  Changes of Name                                    *

8.  Fiscal Year

9.  Litigation

    II.  GENERAL DESCRIPTION OF THE TRUST AND SECURITIES OF THE TRUST

10. General Information regarding         ) 3 Summary of Portfolios
    trust's securities                    ) 5 Why and How are the Bonds
                                              Insured?
                                           13 When Are Distributions
                                              Made to Unitholders?
                                          )18 Ownership and Transfer of Units
                                          )19 How Units May Be Redeemed
                                              Without Charge
                                          )21 How Bonds May Be Removed From
                                          )   The Trusts
                                          )22 Information About the Trustee
                                          )23 Information About the Sponsor
                                          )24 Other Information

                                          )11 What Is The Tax Status of
                                          )   Unitholders?

11. Type of securities comprising         ) 1 What Is The Nuveen Tax-Exempt
    units                                 )   Unit Trust?
                                          ) 3 Summary of Portfolios
                                          ) 4 Composition of Trusts
                                          ) 2 What Are The Objectives Of
                                          )   The Trusts?
                                            5 Why and How are the Bonds
                                              Insured?

12. Certain information regarding         )   *
    periodic payment certificates         )

13. (a)Load, fees, expenses, etc.         )ii Essential Information Regarding
                                          )   the Trusts on Date of Deposit of
                                              Bonds
                                          ) 6 How Is The Public Offering Price
                                          )   Determined?
                                          ) 7 Market For Units
                                          ) 8 What Is Accrued Interest?
                                          ) 9 What Are Estimated Long Term 
                                          )   Return And Estimated Current 
                                          )   Return?
                                          )10 How Was The Price Of The Bonds
                                          )   Determined At Date of Deposit?
                                          )12 What Are Normal Trust Operating
                                          )   Expenses?
                                          ) 3 Summary of Portfolios
                                          )13 When Are Distributions Made
                                          )   To Unitholders?
                                          )15 How Detailed Are Reports To
                                              Unitholders?


<PAGE>


    (b)Certain information regarding      )   *
       periodic payment certificates      )


    (c)Certain percentages                ) 6 How Is the Public Offering Price
                                          )   Determined?
                                          ) 7 Market For Units
                                          ) 9 What Are Estimated Long Term 
                                          )   Return And Estimated Current 
                                          )   Return?
                                          )10 How Was The Price of the Bonds
                                          )   Determined At Date of Deposit?
                                          ) 8 What is Accrued Interest?

    (d)Certain other fees, etc.           )10 How Was The Price Of The Bonds
       payable by holders                 )   Determined At Date of Deposit?
                                          )12 What Are Normal Trust Operating
                                          )   Expenses?
                                          )18 Ownership and Transfer of Units

    (e)Certain profits receivable         ) 4 Composition of Trusts
       by depositor, principal under-     )
       writer, trustee or affiliated      )20 How Units May Be Purchased By
       persons                            )   The Sponsor

    (f)Ratio of annual charges
       to income                                *

14. Issuance of trust's securities        ) 3 Summary of Portfolios
                                          )13 When Are Distributions Made
                                          )   To Unitholders?
                                          )18 Ownership and Transfer of Units
                                          )19 How Units May Be Redeemed
                                          )   Without Charge

15. Receipt and handling of payments      )   *
    from purchasers                       )

16. Acquisition and Disposition of        ) 1 What Is The Nuveen Tax-Exempt
    Underlying Securities                 )   Unit Trust?
                                          ) 3 Summary of Portfolios
                                          ) 4 Composition of Trusts
                                          ) 5 Why and How are the Bonds
                                              Insured?
                                          )19 How Units May Be Redeemed
                                              Without Charge
                                          )21 How Bonds May Be Removed From
                                          )   The Trusts
                                          )24 Other Information

17. Withdrawal or redemption              ) 7 Market For Units
                                          )19 How Units May Be Redeemed
                                          )   Without Charge
                                          )20 How Units May Be Purchased By
                                          )   The Sponsor

18. (a)Receipt and disposition of income  ) 3 Summary of Portfolios
                                          )13 When Are  Distributions
                                              Made To Unitholders?
                                          )15 How Detailed Are Reports To
                                          )   Unitholders?

    (b)Reinvestment of distributions      )14 Accumulation Plan

    (c)Reserves or special funds          ) 3 Summary of Portfolios
                                          )13 When Are Distributions
                                          )   Made To Certificateholders?

    (d)Schedule of distributions          )   *

19. Records, accounts and reports         )13 When Are Distributions Made
                                          )   To Certificateholders?
                                          )15 How Detailed Are Reports To
                                          )   Certificateholders?

20. Certain miscellaneous provisions of   )22 Information About the Trustee
    Trust Agreement                       )23 Information About the Sponsor
                                          )24 Other Information


<PAGE>

21. Loans to security holders             )   *

22. Limitations on liability              ) 3 Summary of Portfolios
                                          ) 4 Composition of Trusts
                                          )22 Information About The Trustee

23. Bond arrangements                     )   *

24. Other material provisions of Trust    )   *
    Agreement.                            )

    III. ORGANIZATION, PERSONNEL AND AFFILIATED PERSONS OF DEPOSITOR

25. Organization of Depositor             )23 Information About the Sponsor

26. Fees received by Depositor            )   *

27. Business of Depositor                 )23 Information About the Sponsor

28. Certain information as to officials   )  *
    and affiliated persons of Depositor   )

29. Voting Securities of Depositor        )23 Information About the Sponsor

30. Persons controlling Depositor         )
                                          )
31. Payments by Depositor for certain     )
    services rendered to trust            )
                                          )   *
32. Payments by Depositor for certain     )
    other services rendered to trust      )
                                          )
33. Remuneration of employees of Depositor)
    for certain services rendered to trust)
                                          )
34. Remuneration of other persons for     )
    certain services rendered to trust    )

<PAGE>


    IV.  DISTRIBUTION AND REDEMPTION OF SECURITIES

35. Distribution of trust's securities by )
    states                                )
                                          )   *
36. Suspension of sales of trust's        )
    securities                            )
                                          )
37. Revocation of authority to distribute )

38. (a)Method of distribution             )
                                          )
    (b)Underwriting agreements            )17 How Units of The Trusts Are
                                          )   Distributed To The Public
    (c)Selling agreements                 )

39. (a)Organization of principal          )
         underwriter                      )
                                          )23 Information About The Sponsor
    (b)NASD membership of principal       )
         underwriter                      )

40. Certain fees received by principal    )   *
    underwriter


41. (a)Business of principal underwriter  )
                                          )
    (b)Branch offices of principal under- )    *
       writer                             )
                                          )
    (c)Salesmen of principal underwriter  )

42. Ownership of trust's securities by    )   *
    certain persons                       )
                                          )
43. Certain brokerage commissions received)   *
    by principal underwriter              )

44. (a)Method of valuation                )ii Essential Information Regarding
                                          )   The Trusts On Date Of Deposit Of
                                          )   Bonds
                                          ) 6 How Is The Public Offering Price
                                          )   Determined?
                                          )10 How Was The Price Of The Bonds
                                          )   Determined At Date of Deposit?
                                          )12 What Are Normal Trust Operating
                                          )   Expenses?


    (b)Schedule as to offering price      )   *

    (c)Variation in offering price to     ) 6 How Is the Public Offering Price
       certain persons                    )   Determined?
                                          ) 8 What Is Accrued Interest?
                                          )10 How Was The Price Of The Bonds
                                          )   Determined At Date of Deposit?

<PAGE>


45. Suspension of redemption rights       )   *

46. (a)Redemption valuation               )16 Unit Value and Evaluation
                                          )19 How Units May Be Redeemed
                                          )   Without Charge
                                          )20 How Units May Be Purchased By
                                          )   The Sponsor

    (b)Schedule as to redemption price    )   *

47. Maintenance of position in underlying ) 5 How Is the Public Offering Price
    securities                            )   Determined?
                                          )20 How Units May Be Purchased By
                                          )   The Sponsor

    V.   INFORMATION CONCERNING THE TRUSTEE OR CUSTODIAN

48. Organization and regulation of Trustee)21 Information About The Trustee

49. Fees and expenses of Trustee          )ii Essential Information Regarding
                                          )   The Trusts On Date of Deposit Of
                                          )   Bonds
                                          )12 What Are Normal Trust Operating
                                          )   Expenses?

50. Trustee's lien                        )12 What Are Normal Trust Operating
                                          )   Expenses?
                                          )13 When Are Distributions Made
                                          )   To Unitholders?

    VI.  INFORMATION CONCERNING INSURANCE OF HOLDERS OF SECURITIES

51. Insurance of holders of trust's       )   *
    securities                            )

                        VII.  POLICY OF REGISTRANT

52. (a)Provisions of trust agreement with )12 What Are Normal Trust Operating
       respect to selection or elimination)   Expenses?
       of underlying securities           )19 How Units May Be Redeemed With-
                                          )   out Charge
                                          )21 How Bonds May Be Removed From
                                          )   The Trusts

    (b)Transactions involving elimination )   *
       of underlying securities           )

    (c)Policy regarding substitution or   ) 3 Summary of Portfolio
       elimination of underlying          ) 4 Composition of Trusts
       securities                         )21 How Bonds May Be Removed From
                                          )   The Trusts

    (d)Fundamental policy not otherwise   )   *
       covered                            )

53. Tax status of trust                   )11 What Is The Tax Status Of
                                          )   Unitholders?

    VIII. FINANCIAL AND STATISTICAL INFORMATION

54. Trust's securities during last ten years)   *

55.)                                      )   *
56.)Certain information regarding         )
57.)periodic payment certificates         )
58.)                                      )

__________

*Inapplicable, omitted, answer negative or not required.

<PAGE>
   
                                AUGUST 10, 1995
                             SUBJECT TO COMPLETION
 
NUVEEN  Tax-Exempt Unit Trusts
             PROSPECTUS
            Series 817
             August 10, 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  817 consists  of  three  underlying
separate  unit  investment trusts  designated as  California Insured  Trust 252,
Massachusetts Insured  Trust 128  and New  York Insured  Trust 239.  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, a Division of the McGraw-Hill Companies ("Standard & Poor's") or Moody's
Investors Service, Inc. ("Moody's") on the  Date of Deposit. All obligations  in
each  Insured Trust are covered by policies  of insurance obtained from the MBIA
Insurance 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 and the Bonds in the
Insured Trusts and the Units of each such Trust have received a rating of  "AAA"
by  Standard & Poor's. INSURANCE RELATES ONLY TO THE BONDS IN THE INSURED TRUSTS
AND NOT TO THE UNITS OFFERED HEREBY OR TO THEIR MARKET VALUE. (See Section 5.)
    
 
THE OBJECTIVES of the Trusts are  tax-exempt income and conservation of  capital
through  a diversified  investment in tax-exempt  Bonds. (SEE SECTIONS  2, 3 AND
11.) The payment of interest and  the preservation of principal are, of  course,
dependent upon the continuing ability of the issuers of Bonds and of any insurer
thereof  to meet  their obligations thereunder.  There is no  guarantee that the
Trusts' objectives will be achieved. (SEE PAGE A-1.)
 
DISTRIBUTIONS of  interest received  by each  Trust will  be made  semi-annually
unless  the Unitholder elects to receive them monthly or quarterly. (SEE SECTION
13.) Distribution of funds in the Principal Account, if any, will ordinarily  be
made semi-annually.
 
FOR  ESTIMATED LONG TERM RETURNS AND ESTIMATED CURRENT RETURNS to Unitholders in
each Trust on the  business day prior to  the Date of Deposit.  (SEE PAGE 3  AND
SECTION 9.)
 
THE  PUBLIC OFFERING PRICE  per Unit of  each Trust during  the initial offering
period is equal to a pro rata share of the OFFERING prices of the Bonds in  such
Trust's  portfolio plus  a sales charge  of up  to 4.90% of  the Public Offering
Price (equivalent to  5.152% of the  net amount invested);  the sales charge  is
somewhat  lower on Trusts  with lesser average maturities.  (SEE SECTION 6.) The
Secondary Market Public Offering Price per Unit for each Trust will be equal  to
a  pro rata share of the  sum of BID prices of the  Bonds in such Trust plus the
sales charges determined based on the number of years remaining to the  maturity
of  each  Bond. Accrued  interest from  the  preceding Record  Date to,  but not
including, the settlement date (normally three 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
      California Insured Trust 252                            3         8-21
      Massachusetts Insured Trust 128                         3        22-36
      New York Insured Trust 239                              3        37-50
      GENERAL MATTERS
      Accrued Interest                                        8         A-17
      Accumulation Plan                                      14         A-25
      Bonds, How Selected                                     3            7
      Bonds, Initial Determination of Offering Price         10         A-19
      Bonds, Limited Right of Substitution                    4          A-7
      Bond Ratings                                            3         8-50
      Bonds, Removal from Trust                              21         A-34
      Call Provisions of Portfolio Bonds                   3, 4     8-50,A-8
      Capital Gains Taxability                               11         A-20
      Dealer Discount                                        17         A-29
      Description of Units of Trust                           1            5
      Distributions to Unitholders                           13         A-24
      Distribution Payment Dates                          3, 13   8-50, A-24
      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-29
      Expenses to Fund                                       12         A-23
      Insurance on Bonds in the Insured Trusts                5         A-10
      Insurance on Certain Bonds in the Traditional
      Trusts                                                  5         A-12
      Interest Income to Trust                                3         8-50
      Investments, Schedules of                               3         8-50
      Legality of Units                                      24         A-38
      Limitations on Liabilities of Sponsor and Trustee       22        A-35
      Market for Units                                        7         A-17
      Minimum Transaction                                    17         A-29
      Objectives of the Trusts                                2            6
      Optional Distribution Plan                             13         A-24
      Other Information                                      24         A-37
      Ownership and Transfer of Units                        18         A-31
      Public Offering Price of Units                          6         A-13
      Quantity Purchases                                      6         A-13
      Record Dates                                           13         A-24
      Ratings, Description of                                24         A-39
      Redemption of Units by Trustee                         19    A-32,A-34
      Report of Independent Public Accountants                3           52
      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-36
      State Tax Status                                        3         8-50
      Statements of Condition                                 3           53
      Successor Trustees and Sponsors                        22         A-35
      Tax Status of Unitholders                              11         A-20
      Trustee, Information About                             22         A-35
      Trust Indenture, Amendment and Termination             24         A-37
      Unit Value                                             16         A-29
</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>
  --------------------------------------------------------------------------------------
  California Insured Trust 252.............      5.65%         5.68%           5.70%
  Massachusetts Insured Trust 128..........      5.52%         5.55%           5.57%
  New York Insured Trust 239...............      5.60%         5.64%           5.66%
</TABLE>
    
 
                           ESTIMATED CURRENT RETURNS
 
   
<TABLE>
<CAPTION>
                                                          PLAN OF DISTRIBUTION
                                                ----------------------------------------
                    TRUST                       MONTHLY      QUARTERLY      SEMI-ANNUAL
  <S>                                           <C>          <C>            <C>
  --------------------------------------------------------------------------------------
  California Insured Trust 252.............      5.54%         5.57%           5.59%
  Massachusetts Insured Trust 128..........      5.41%         5.44%           5.46%
  New York Insured Trust 239...............      5.54%         5.58%           5.60%
</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
                                AUGUST 9, 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>
                                                      CALIFORNIA         MASSACHUSETTS         NEW YORK
                                                        INSURED             INSURED             INSURED
                                                       TRUST 252           TRUST 128           TRUST 239
<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....  $    3,286,365      $    3,350,840      $    3,339,369
    Divided by Number of Units....................  $        93.90      $        95.74      $        95.41
    Plus Sales Charge*............................  $         4.84      $         4.93      $         4.92
    Public Offering Price Per Unit(1).............  $        98.74      $       100.67      $       100.33
Redemption Price Per Unit (exclusive of accrued
  interest).......................................  $        93.40      $        95.28      $        94.93
Sponsor's Initial Repurchase Price Per Unit
  (exclusive of accrued interest).................  $        93.90      $        95.74      $        95.41
Excess of Public Offering Price Per Unit over
  Redemption Price Per Unit.......................  $         5.34      $         5.39      $         5.40
Excess of Public Offering Price Per Unit over
  Sponsor's Repurchase Price Per Unit.............  $         4.84      $         4.93      $         4.92
Calculation of Estimated Net Annual Interest
  Income Per Unit
    Annual Interest Income(2).....................  $       5.7179      $       5.6964      $       5.8116
    Less Estimated Annual Expense.................  $        .2517      $        .2485      $        .2491
                                                    ---------------     ---------------     ---------------
    Estimated Net Annual Interest Income(3).......  $       5.4662      $       5.4479      $       5.5625
Daily Rate of Accrual Per Unit....................  $       .01518      $       .01513      $       .01545
Estimated Current Return(4).......................           5.54%               5.41%               5.54%
Estimated Long Term Return(4).....................           5.65%               5.52%               5.60%
Estimated Annual Organizational Expenses Per
  Unit(5).........................................  $       .02914      $       .02914      $       .02914
 
<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 three 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:
    California Insured Trust--$.08, Massachusetts Insured Trust--$.08 and New York Insured Trust-- $.07. (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.
(5) Each Trust (and therefore Unitholders) will bear all or  a portion of its organizational costs (including costs of  preparing
    the  registration statements,  the trust indenture  and other  closing documents, registering  Units with  the Securities and
    Exchange Commission and states, the initial audit  of each Trust portfolio, legal fees  and the initial fees and expenses  of
    the  Trustee but  not including the  expenses incurred in  the printing of  preliminary and final  prospectuses, and expenses
    incurred in the preparation and printing of brochures and  other advertising materials and any other selling expenses) as  is
    common  for mutual funds. Total organizational expenses will be amortized over a five year period. See "WHAT ARE NORMAL TRUST
    OPERATING EXPENSES?" and "Statements of Condition."  Historically, the sponsors of unit  investment trusts have paid all  the
    costs of establishing such trusts.
</TABLE>
    
 
                                       4
<PAGE>
                   ESSENTIAL INFORMATION REGARDING THE TRUSTS
                                  (CONTINUED)
 
   
<TABLE>
<S>                                              <C>
Record Dates......................................................................See Section 13
Distribution Dates................................................................See Section 13
Minimum Principal Distribution....................................................$0.10 Per Unit
Date Trusts Established..........................................................August 10, 1995
Settlement Date..................................................................August 15, 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>
  California Insured Trust 252.............          $1.6513          $1.3313         $1.1413
  Massachusetts Insured Trust 128..........           1.6196           1.2996          1.1096
  New York Insured Trust 239...............           1.6250           1.3050          1.1150
  ------------
  *  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>
  California Insured Trust 252.............       67064W 259       67064W 267      67064W 275
  Massachusetts Insured Trust 128..........       670947 431       670947 449      670947 456
  New York Insured Trust 239...............       67101K 466       67101K 474      67101K 482
</TABLE>
    
 
                            ------------------------
 
THE NUVEEN TAX-EXEMPT UNIT TRUST
   
SERIES 817
    
 
   
1.  WHAT IS THE NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 817?
    
 
   
Series 817 of the Nuveen  Tax-Exempt Unit Trust is one  of a series of  separate
but  similar  investment companies  created  by the  Sponsor,  each of  which is
designated  by  a  different  Series  number.  This  Series  consists  of  three
underlying  separate unit investment trusts,  combined under one trust indenture
and agreement, designated  California Insured Trust  252, Massachusetts  Insured
Trust  128 and New York  Insured Trust 239. 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  Agreement  dated  August  10,  1995  (the
"Indenture")  between John Nuveen & Co.  Incorporated (the "Sponsor") and United
States Trust Company of New York (the "Trustee").
    
 
                                       5
<PAGE>
   
    The Sponsor has deposited with  the Trustee delivery statements relating  to
contracts  for the  purchase of municipal  debt obligations  together with funds
represented by an irrevocable letter of credit issued by a major commercial bank
in the amount, including accrued interest,  required for their purchase (or  the
obligations  themselves) in the  principal amount of  $10,500,000 (the "Bonds"),
which initially constitute the  underlying securities of  the Trusts. Bonds  may
include  fixed rate obligations with regularly scheduled interest payments, zero
coupon bonds and  stripped obligations, which  represent evidences of  ownership
interests with respect to either a principal payment or a payment of interest on
a  tax-exempt obligation  ("Stripped Obligations"). See  "SUMMARY OF PORTFOLIOS"
and "GENERAL  TRUST INFORMATION"  for  a discussion  of  zero coupon  bonds  and
Stripped  Obligations. The  following principal  amounts were  deposited in each
Trust:  $3,500,000  in   the  California  Insured   Trust,  $3,500,000  in   the
Massachusetts  Insured Trust and $3,500,000 in  the New York Insured Trust. Some
of the delivery  statements may relate  to contracts for  the purchase of  "when
issued"  or other Bonds with  delivery dates after the  date of settlement for a
purchase made on  the Date of  Deposit. See the  "Schedules of Investments"  and
Section  4. For  a discussion  of the  Sponsor's obligations  in the  event of a
failure of any contract  for the purchase  of any of the  Bonds and its  limited
right to substitute other bonds to replace any failed contract, see Section 4.
    
 
    Payment  of interest on the Bonds in each Insured Trust, and of principal at
maturity, is guaranteed under policies of  insurance obtained by the Sponsor  or
by  the issuers of the Bonds. (See Section  5.) As a general matter, neither the
issuer nor the Sponsor has obtained insurance  with respect to the Bonds in  any
Traditional Trust.
 
   
    The  Trustee has delivered to the  Sponsor registered Units for 35,000 Units
of the California Insured Trust, 35,000 Units of the Massachusetts Insured Trust
and 35,000  Units  of the  New  York  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.
    
 
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 MBIA Insurance
Corporation, and as a  result of such insurance  the obligations in the  Insured
Trusts  are rated "Aaa" by Moody's and  "AAA" by Standard & Poor's. (SEE SECTION
5.) All obligations in each Traditional Trust  are rated in the 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 or Moody's  (including
provisional    or   conditional    ratings).   In    addition,   certain   Bonds
 
                                       6
<PAGE>
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 rating  of the Bonds or the
Moody's 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 MBIA Insurance  Corporation
insurance on such Bonds.
 
    In  order for Bonds in the Insured  Trusts to be eligible for MBIA Insurance
Corporation insurance,  they  must have  credit  characteristics which,  in  the
opinion  of the insurer,  would qualify them  as "investment grade" obligations.
Insurance is not a substitute for the basic credit of an issuer, but supplements
the existing credit and provides additional security therefor. (SEE SECTION 5.)
 
    Certain bonds may carry a "mandatory put" (also referred to as a  "mandatory
tender"  or "mandatory repurchase") feature pursuant to which the holder of such
bonds will receive payment of the full principal amount thereof on a stated date
prior to the maturity date unless  such holder affirmatively acts to retain  the
bond.  Under the Indenture,  the Trustee does  not have the  authority to act to
retain Bonds with  such features; accordingly,  it will receive  payment of  the
full  principal amount of any such Bonds on the stated put date and such date is
therefore treated as the maturity date of such Bonds in selecting Bonds for  the
respective  Trusts and for  purposes of calculating the  average maturity of the
Bonds in any Trust.
 
                                       7
<PAGE>
   
CALIFORNIA INSURED TRUST 252
    
 
   
    The  Portfolio of  California Insured  Trust 252  consists of  7 obligations
issued by entities located  in California. 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,  1;
Municipal  Lease Revenue, 2; Water and/or Sewer  Revenue, 2. All of the Bonds in
the Trust, as insured, are rated AAA by Standard & Poor's and Aaa by Moody's
    
 
   
    At the Date of Deposit, the average maturity of the Bonds in the  California
Insured  Trust is 25.3  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 26.5% of the aggregate offering price of the
Bonds)    are   original    issue   discount    bonds.   See    "GENERAL   TRUST
INFORMATION--ORIGINAL ISSUE  DISCOUNT  BONDS  AND STRIPPED  OBLIGATIONS"  for  a
discussion  of the  characteristics of  such bonds  and of  the risks associated
therewith.
    
 
    Approximately 29% of  the aggregate  principal amount  of the  Bonds in  the
Trust  consists of obligations  of issuers whose  revenues are primarily derived
from the sale of water and/or sewerage services.
 
    Approximately 29% of  the aggregate  principal amount  of the  Bonds in  the
Trust consists of municipal lease obligations.
 
    For  a discussion of the  risks associated with investments  in the bonds of
various issuers, see "General Trust Information" in this section.
 
   
    The Sponsor entered into contracts to  acquire the Bonds on August 9,  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>
  $3,268,580       $17,785           $200,125      $3,268,865                 .50%
</TABLE>
    
 
    Neither  cost  to  Sponsor  nor   profit  (or  loss)  to  Sponsor   reflects
underwriting  profits or losses received or  incurred by the Sponsor through its
participation  in  underwriting  syndicates.  An  underwriter  or   underwriting
syndicate  purchases bonds  from the issuer  on a negotiated  or competitive bid
basis as principal with  the motive of  marketing such bonds  to investors at  a
profit.  The Sponsor did not participate as  either the sole underwriter or as a
manager or member of a syndicate that  acted as the original underwriter of  any
of the Bonds.
 
   
    Unitholders  may elect  to have  interest distributions  made on  a monthly,
quarterly or semi-annual basis. The interest on the Bonds initially deposited in
the California Insured Trust, less estimated expenses, is estimated to accrue at
the rate of $.01532 per Unit per day under the semi-annual plan of distribution,
$.01527 per Unit per  day under the quarterly  plan of distribution and  $.01518
per Unit per day under the monthly plan of
    
 
                                       8
<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 California Insured  Trust
under  the various plans appear in the  following table based upon estimated Net
Annual Interest Income at the Date of Deposit:
 
   
<TABLE>
<CAPTION>
                                                                                                          NORMAL
                                                                                                      DISTRIBUTIONS
CALIFORNIA INSURED TRUST                          1995                             1996                  PER YEAR
<S>                                     <C>            <C>            <C>            <C>            <C>
----------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        9/1           11/1            2/1            5/1
Distribution Date.....................       9/15          11/15           2/15           5/15
--------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .3187(1)                                                  $  5.4662
                                                          --------  $.4554 every month  --------
Quarterly Distribution Plan...........  $   .3187(1)   $   .9162(2)   $  1.3743      $  1.3743        $  5.4982
Semi-Annual Distribution Plan.........  $   .3187(1)   $   .9192(3)                  $  2.7576        $  5.5172
--------------------------------------------------------------------------------------------------------------------
<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  2-month distribution;  subsequent  quarterly
    distributions will be regular 3-month distributions.
(3)  The second distribution  under the semi-annual distribution  plan represents a  2-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
    
 
    The accrual amounts set forth above, and  in turn the amount of interest  to
be  distributed annually per Unit, will  generally change as Bonds are redeemed,
mature or are sold or as fees and expenses increase or decrease.
 
TAX STATUS--CALIFORNIA INSURED TRUST
 
    For a discussion of  the Federal tax status  of income earned on  California
Insured Trust Units, see Section 11.
 
    In the opinion of Orrick, Herrington & Sutcliffe, special California counsel
to  the Series, under existing California income and property tax law applicable
to individuals who are California residents:
 
        The California  Insured  Trust  is  not  an  association  taxable  as  a
    corporation  and the income of the  California Insured Trust will be treated
    as the income of the Unitholders under the income tax laws of California.
 
        Interest on the underlying securities (which may include bonds or  other
    obligations  issued by the  governments of Puerto  Rico, the Virgin Islands,
    Guam or  the  Northern Mariana  Islands)  which  is exempt  from  tax  under
    California  personal income tax  and property tax laws  when received by the
    California Insured  Trust  will,  under  such laws,  retain  its  status  as
    tax-exempt  interest when  distributed to Unitholders.  However, interest on
    the underlying securities attributed to a Unitholder which is a  corporation
    subject  to the California franchise tax laws may be includable in its gross
    income for purposes of determining its California franchise tax.
 
        Under California  income  tax law,  each  Unitholder in  the  California
    Insured  Trust will have  a taxable event when  the California Insured Trust
    disposes of a security (whether by sale, exchange, redemption or payment  at
    maturity)  or when  the Unitholder  redeems or  sells Units.  Because of the
    requirement that tax cost basis be  reduced to reflect amortization of  bond
    premium, under some circumstances a
 
                                       9
<PAGE>
    Unitholder  may realize taxable gain when Units  are sold or redeemed for an
    amount equal to, or less  than, their original cost.  The total tax cost  of
    each Unit to a Unitholder is allocated among each of the bond issues held in
    the  California  Insured Trust  (in accordance  with  the proportion  of the
    California Insured Trust comprised by each bond issue) in order to determine
    his per  unit tax  cost for  each bond  issue; and  the tax  cost  reduction
    requirements  relating to amortization of bond premium will apply separately
    to the per unit cost of each bond issue. Unitholders' bases in their  Units,
    and the bases for their fractional interest in each California Insured Trust
    asset,  may have to be adjusted for their pro rata share of accrued interest
    received, if any, on securities delivered after the Unitholders'  respective
    settlement dates.
 
        Under  the California personal  property tax laws,  bonds (including the
    bonds  in  the  California  Insured  Trust  as  well  as  "regular-way"  and
    "when-issued"  contracts for the purchase of  bonds) or any interest therein
    is exempt from such tax.
 
        Any proceeds paid under  the insurance policy issued  to the Trustee  of
    the  fund with respect to the bonds  in the California Insured Trust as well
    as "regular-way" and "when-issued" contracts for the purchase of bonds which
    represent maturing interest  on defaulted  obligations held  by the  Trustee
    will  be exempt  from California  personal income  tax if,  and to  the same
    extent as, such interest would have been so exempt if paid by the issuer  of
    the defaulted obligations.
 
        Under  Section 17280(b)(2) of the  California Revenue and Taxation Code,
    interest on indebtedness incurred or continued to purchase or carry Units of
    the California  Insured Trust  is not  deductible for  the purposes  of  the
    California  personal  income tax.  While  there presently  is  no California
    authority interpreting  this  provision,  Section  17280(b)(2)  directs  the
    California  Franchise  Tax Board  to  prescribe regulations  determining the
    proper allocation and apportionment of interest costs for this purpose.  The
    Franchise  Tax Board has not yet proposed or prescribed such regulations. In
    interpreting the generally similar  Federal provision, the Internal  Revenue
    Service  has taken the position that  such indebtedness need not be directly
    traceable to the purchase or carrying of Units (although the Service has not
    contended that a deduction for interest on indebtedness incurred to purchase
    or improve  a  personal residence  or  to  purchase goods  or  services  for
    personal  consumption  will be  disallowed). In  the absence  of conflicting
    regulations or  other California  authority,  the California  Franchise  Tax
    Board  generally  has  interpreted California  statutory  tax  provisions in
    accord with  Internal Revenue  Service  interpretations of  similar  Federal
    provisions.
 
ECONOMIC FACTORS--CALIFORNIA
 
    As  described  above, except  to the  extent the  Fund invests  in temporary
investments, the Fund will invest substantially all of its assets in  California
Municipal  Obligations. The Fund is therefore susceptible to political, economic
or regulatory  factors affecting  issuers of  California Municipal  Obligations.
These  include the possible adverse effects of certain California constitutional
amendments, legislative measures, voter initiatives  and other matters that  are
described  below. The following information provides only a brief summary of the
complex factors affecting  the financial situation  in California (the  "State")
and  is derived from sources  that are generally available  to investors and are
believed to  be accurate.  No  independent verification  has  been made  of  the
accuracy  or completeness of  any of the  following information. It  is based in
part on information obtained from various State and local agencies in California
or  contained   in  Official   Statements  for   various  California   Municipal
Obligations.
 
                                       10
<PAGE>
    There  can  be  no  assurance that  future  statewide  or  regional economic
difficulties, and the resulting impact  on State or local governmental  finances
generally,  will not adversely  affect the market  value of California Municipal
Obligations held  in the  portfolio of  the Fund  or the  ability of  particular
obligors  to make  timely payments  of debt  service on  (or relating  to) those
obligations.
 
ECONOMIC OVERVIEW
 
    California's economy  is the  largest among  the 50  states and  one of  the
largest  in the  world. The State's  population of almost  32 million represents
12.3% of the total United States population and grew by 27% in the 1980s.  While
the  State's  substantial population  growth during  the 1980s  stimulated local
economic growth and  diversification and  sustained a real  estate boom  between
1984  and 1990, it has increased strains  on the State's limited water resources
and its infrastructure.  Resultant traffic congestion,  school overcrowding  and
high housing costs have increased demands for government services and may impede
future  economic growth. Population growth has slowed between 1991 and 1993 even
while substantial immigration has  continued, due to  a significant increase  in
outmigration  by California residents.  Generally, the household  incomes of new
residents have been substantially lower (and their education and social  service
utilization  higher) than those of departing  households, which may have a major
long-term socioeconomic and fiscal impact. However, with the California  economy
improving,  the recent net outmigration within  the Continental U.S. is expected
to decrease or be reversed.
 
    From mid-1990 to late 1993, the State's economy suffered its worst recession
since the 1930s, with recovery  starting later than for  the nation as a  whole.
The  State  has experienced  the  worst job  losses  of any  post-war recession.
Prerecession job levels may not  be realized until near  the end of the  decade.
The  largest job losses have been in Southern California, led by declines in the
aerospace  and   construction  industries.   Weakness  statewide   occurred   in
manufacturing,  construction,  services  and  trade.  Additional  military  base
closures will have further adverse effects  on the State's economy later in  the
decade.
 
    Since  the start of 1994,  the California economy has  shown signs of steady
recovery and growth.  The State Department  of Finance reports  net job  growth,
particularly  in construction  and related  manufacturing, wholesale  and retail
trade, transportation,  recreation  and services.  This  growth has  offset  the
continuing but slowing job losses in the aerospace industry and restructuring of
the   finance  and  utility   sectors.  Unemployment  in   the  State  was  down
substantially in 1994  from its  10% peak in  January, 1994,  but still  remains
higher  than the national  average rate. Retail  sales were up  strongly in 1994
from year-earlier figures. Delay or  slowdown in recovery will adversely  affect
State revenues.
 
CONSTITUTIONAL LIMITATIONS ON TAXES AND APPROPRIATIONS
 
    LIMITATION  ON  TAXES.  Certain  California  municipal  obligations  may  be
obligations of issuers which rely in  whole or in part, directly or  indirectly,
on  AD  VALOREM property  taxes as  a source  of revenue.  The taxing  powers of
California local governments and districts are  limited by Article XIIIA of  the
California  Constitution, enacted  by the voters  in 1978 and  commonly known as
"Proposition 13." Briefly,  Article XIIIA limits  to 1% of  full cash value  the
rate  of AD VALOREM property taxes on  real property and generally restricts the
reassessment of property to the rate of inflation, not to exceed 2% per year, or
decline in value,  or in the  case of  new construction or  change of  ownership
(subject  to a  number of  exemptions). Taxing  entities may,  however, raise AD
VALOREM taxes above the  1% limit to pay  debt service on voter-approved  bonded
indebtedness.
 
                                       11
<PAGE>
    Under Article XIIIA, the basic 1% AD VALOREM tax levy is applied against the
assessed value of property as of the owner's date of acquisition (or as of March
1,  1975, if acquired earlier), subject  to certain adjustments. This system has
resulted in  widely varying  amounts of  tax on  similarly situated  properties.
Several  lawsuits have  been filed challenging  the acquisition-based assessment
system of Proposition 13 and on June 18, 1992 the U.S. Supreme Court announced a
decision upholding Proposition 13.
 
    Article XIIIA prohibits local governments  from raising revenues through  AD
VALOREM  property  taxes above  the 1%  limit;  it also  requires voters  of any
governmental unit to give two-thirds approval  to levy any "special tax."  Court
decisions,  however, allowed  non-voter approved  levy of  "general taxes" which
were not dedicated to a specific use. In response to these decisions, the voters
of the State in 1986 adopted an initiative statute which imposed significant new
limits on the ability of local entities  to raise or levy general taxes,  except
by  receiving  majority  local  voter  approval.  Significant  elements  of this
initiative, "Proposition 62,"  have been  overturned in recent  court cases.  An
initiative   proposed  to  re-enact  the  provisions  of  Proposition  62  as  a
constitutional amendment was defeated by the voters in November 1990, but such a
proposal may be renewed in the future.
 
    APPROPRIATIONS LIMITS. California and its  local governments are subject  to
an  annual "appropriations  limit" imposed  by Article  XIIIB of  the California
Constitution, enacted  by  the  voters  in 1979  and  significantly  amended  by
Propositions  98 and 111 in 1988 and 1990, respectively. Article XIIIB prohibits
the State or any covered local government from spending "appropriations  subject
to  limitation" in excess  of the appropriations  limit imposed. "Appropriations
subject to limitation" are  authorizations to spend  "proceeds of taxes,"  which
consists  of  tax  revenues and  certain  other funds,  including  proceeds from
regulatory licenses,  user  charges or  other  fees,  to the  extent  that  such
proceeds  exceed the cost of providing the  product or service, but "proceeds of
taxes" excludes most State subventions to local governments. No limit is imposed
on appropriations of funds which are not "proceeds of taxes," such as reasonable
user charges or fees, and certain other non-tax funds, including bond proceeds.
 
    Among the  expenditures not  included in  the Article  XIIIB  appropriations
limit  are (1)  the debt  service cost  of bonds  issued or  authorized prior to
January 1, 1979, or  subsequently authorized by  the voters, (2)  appropriations
arising  from certain emergencies  declared by the  Governor, (3) appropriations
for qualified  capital  outlay projects,  (4)  appropriations by  the  State  of
post-1989  increases  in  gasoline  taxes  and  vehicle  weight  fees,  and  (5)
appropriations made in certain cases of emergency.
 
    The appropriations  limit for  each  year is  adjusted annually  to  reflect
changes  in  cost  of  living  and  population,  and  any  transfers  of service
responsibilities between government units. The definitions for such  adjustments
were liberalized in 1990 to follow more closely growth in California's economy.
 
    "Excess"  revenues are now  measured over a two-year  cycle. With respect to
local governments, excess revenues must be  returned by a revision of tax  rates
or  fee schedules  within the  two subsequent  fiscal years.  The appropriations
limit for  a local  government may  be overridden  by referendum  under  certain
conditions for up to four years at a time. With respect to the State, 50% of any
excess  revenues is  to be  distributed to  K-12 school  districts and community
college districts (collectively, "K-14  districts") and the other  50% is to  be
refunded  to taxpayers. With more liberal  annual adjustment factors since 1988,
and depressed revenues  since 1990  because of the  recession, few  governments,
including the State,
 
                                       12
<PAGE>
are  currently  operating near  their spending  limits,  but this  condition may
change over time. Local governments may by voter approval exceed their  spending
limits for up to four years.
 
    Because  of the complex nature of Articles XIIIA and XIIIB of the California
Constitution, the ambiguities and possible  inconsistencies in their terms,  and
the  impossibility of predicting future  appropriations or changes in population
and cost of living,  and the probability of  continuing legal challenges, it  is
not currently possible to determine fully the impact of Article XIIIA or Article
XIIIB  on California  Municipal Obligations or  on the ability  of California or
local governments to pay debt service on such California Municipal  Obligations.
It  is not presently possible  to predict the outcome  of any pending litigation
with respect  to  the ultimate  scope,  impact or  constitutionality  of  either
Article  XIIIA or Article XIIIB,  or the impact of  any such determinations upon
State agencies or local governments, or  upon their ability to pay debt  service
on  their obligations. Future initiatives or  legislative changes in laws or the
California Constitution  may also  affect  the ability  of  the State  or  local
issuers to repay their obligations.
 
    OBLIGATIONS  OF THE STATE OF  CALIFORNIA. Under the California Constitution,
debt service on outstanding general obligation bonds is the second charge to the
General Fund after support of the  public school system and public  institutions
of  higher  education.  Total  outstanding  general  obligation  bond  and lease
purchase debt of the State increased from $9.4 billion at June 30, 1987 to $23.5
billion at June 30, 1994. In FY1993-94, debt service on general obligation bonds
and lease purchase debt was approximately 5.2% of General Fund revenues.
 
    RECENT FINANCIAL RESULTS. The principal sources of General Fund revenues  in
1992-93  were the  California personal income  tax (44% of  total revenues), the
sales tax (38%), bank and corporation taxes (12%), and the gross premium tax  on
insurance  (3%). California maintains a  Special Fund for Economic Uncertainties
(the "Economic Uncertainties Fund"),  derived from General  Fund revenues, as  a
reserve to meet cash needs of the General Fund.
 
    GENERAL.  Throughout  the 1980's,  State spending  increased rapidly  as the
State population and economy also grew rapidly, including increased spending for
many assistance  programs  to  local  governments,  which  were  constrained  by
Proposition  13 and other laws. The largest State program is assistance to local
public school districts.  In 1988,  an initiative (Proposition  98) was  enacted
which  (subject to suspension  by a two-thirds  vote of the  Legislature and the
Governor) guarantees local  school districts and  community college districts  a
minimum share of State General Fund revenues (currently about 33%).
 
    Since  the  start  of  1990-91  Fiscal Year,  the  State  has  faced adverse
economic, fiscal,  and  budget  conditions.  The  economic  recession  seriously
affected  State tax revenues.  It also caused  increased expenditures for health
and welfare programs.  The State is  also facing a  structural imbalance in  its
budget  with  the largest  programs supported  by  the General  Fund (education,
health, welfare and corrections) growing at  rates higher than the growth  rates
for the principal revenue sources of the General Fund. These structured concerns
will  be  exacerbated in  coming  years by  the  expected need  to substantially
increase capital and  operating funds for  corrections as a  result of a  "Three
Strikes"  law enacted in 1994. As a result, the State entered a period of budget
imbalance, with  expenditures exceeding  revenues for  four of  the five  fiscal
years  ending in 1991-92; revenues and expenditures were about equal in 1992-93.
By June 30,  1993, the State's  General Fund  had an accumulated  deficit, on  a
budget basis, of approximately $2.8 billion.
 
                                       13
<PAGE>
    RECENT  BUDGETS. The  state failed  to enact its  1992-93 budget  by July 1,
1992. Although the  State had no  legal authority  to pay many  of its  vendors,
certain  obligations  (such  as  debt  service,  school  apportionments, welfare
payments, and employee salaries) were  payable because of continuing or  special
appropriations,  or court  orders. However,  the State  Controller did  not have
enough cash to pay as they came due all of these ongoing obligations, as well as
valid obligations incurred in the prior fiscal year.
 
    Starting on July 1, 1992, the  Controller was required to issue  "registered
warrants"  in  lieu  of  normal  warrants  backed  by  cash  to  pay  many State
obligations. Available  cash  was  used to  pay  constitutionally  mandated  and
priority  obligations.  Between July  1 and  September  3, 1992,  the Controller
issued an aggregate of approximately $3.8 billion of registered warrants all  of
which were called for redemption by September 4, 1992 following enactment of the
1992-93 Budget Act and issuance by the State of short-term notes.
 
    The 1992-93 Budget Act, when finally adopted, was projected to eliminate the
State's accumulated deficit, with additional expenditure cuts and a $1.3 billion
transfer of State education funding costs to local governments by shifting local
property  taxes to school districts. However,  as the recession continued longer
and deeper than expected,  revenues once again were  far below projections,  and
only  reached a level just equal to  the amount of expenditures. Thus, the State
continued to carry its $2.8 billion budget deficit at June 30, 1993.
 
    The 1993-94 Budget  Act represented  a third consecutive  year of  difficult
budget  choices. As in the prior year, the budget contained no general state tax
increases, and relied principally on  expenditure cuts, particularly for  health
and  welfare and  higher education,  a two-year  suspension of  the renters' tax
credit, some one-time and accounting  adjustments, and -- the largest  component
--  an additional $2.6 billion transfer of property taxes from local government,
particularly counties, to  school districts  to reduce  State education  funding
requirements.  A temporary state sales tax scheduled  to expire on June 30, 1993
was extended for six  months, and dedicated to  support local government  public
safety costs.
 
    A  major  feature  of  the  budget was  a  two-year  plan  to  eliminate the
accumulated deficit  by  borrowing  into  the  1994-95  fiscal  year.  With  the
recession  still  continuing longer  than expected,  the  General Fund  had $800
million less revenue and  $800 million higher expenditures  than budgeted. As  a
result  revenues only exceed  expenditures by about  $500 million. However, this
was the  first operating  surplus  in four  years  and reduced  the  accumulated
deficit  to $2.0 billion at June 30, 1994 (after taking account of certain other
accounting reserves).
 
    CURRENT BUDGET.  The 1994-95  Budget Act  was passed  on July  8, 1994,  and
provides  for an  estimated $41.9  billion of  General Fund  revenues, and $40.9
billion of expenditures. The budget assumed receipt of about $750 million of new
federal assistance for the costs of incarceration, education, health and welfare
related to undocumented immigrants. Other major components of the budget include
further reductions  in health  and welfare  costs and  miscellaneous  government
costs,  some additional transfers of funds from  local government, and a plan to
defer retirement of $1 billion of the accumulated budget deficit to the  1995-96
fiscal  year. The federal government has apparently budgeted only $33 million of
the expected immigration aid. However, this  shortfall is expected to be  almost
fully  offset  by  higher  than projected  revenues,  and  lower  than projected
caseload growth, as the economy improves.
 
    The State issued $7.0 billion of short-term  debt in July, 1994 to meet  its
cash  flow needs and to  finance the deferral of  part of the accumulated budget
deficit to the 1995-96 fiscal
 
                                       14
<PAGE>
year. In order  to assure repayment  of the  $4 billion, 22-month  part of  this
borrowing,  the State enacted legislation (the  "Trigger Law") which can lead to
automatic, across-the-board  cuts in  General Fund  expenditures in  either  the
1994-95  or 1995-96 fiscal years if cash  flow projections made at certain times
during those years  show deterioration from  the projections made  in July  1994
when  the borrowings were  made. On November  15, 1994, the  State Controller as
part of the Trigger Law reported that  the cash position of the General Fund  on
June  30, 1995 would be about $580  million better than earlier projected, so no
automatic budget adjustments were required  in 1994-95. The Controller's  report
showed  that  loss  of  federal  funds  was  offset  by  higher  revenues, lower
expenditures, and certain other increases in cash resources.
 
    PROPOSED 1995-96 BUDGET.   On January 10, 1995,  the Governor presented  his
proposed FY 1995-96 Budget. This budget projects total General Fund revenues and
transfers  of $42.5 billion, and expenditures  of $41.7 billion, to complete the
elimination of  the  accumulated  deficits from  earlier  years.  However,  this
proposal  leaves no cushion,  as the projected  budget reserve at  June 30, 1996
would be  only about  $92  million. While  proposing  increases in  funding  for
schools,  universities and  corrections, the  Governor proposes  further cuts in
welfare programs,  and a  continuation of  the "realignment"  of functions  with
counties  which  would save  the  State about  $240  million. The  Governor also
expects about  $800  million  in  new  federal aid  for  the  State's  costs  of
incarcerating  and educating illegal  immigrants. The Budget  proposal also does
not account for  possible additional  costs if the  State loses  its appeals  on
lawsuits  which are currently pending concerning  such matters as school funding
and pension payments,  but these appeals  could take several  years to  resolve.
Part  of  the Governor's  proposal  also is  a 15%  cut  in personal  income and
corporate taxes, to be phased in  over three years, starting with calendar  year
1996 (which would have only a small impact on 1995-96 income).
 
    The  State's  difficult financial  condition  for the  current  and upcoming
budget  years  will  result  in   continued  pressure  upon  almost  all   local
governments,  particularly school districts  and counties which  depend on State
aid. Despite efforts in recent years  to increase taxes and reduce  governmental
expenditures, there can be no assurance that the State will not face budget gaps
in the future.
 
    BOND  RATING.   State general obligation bonds ratings were reduced in July,
1994 to "A1" by Moody's and "A" by S&P. Both of these ratings were reduced  from
"AAA"  levels which the  State held until  late 1991. There  can be no assurance
that such ratings will be maintained in the future. It should be noted that  the
creditworthiness  of  obligations  issued  by local  California  issuers  may be
unrelated to  the  creditworthiness  of  obligations  issued  by  the  State  of
California,  and that there  is no obligation on  the part of  the State to make
payment on such local obligations in the event of default.
 
    LEGAL PROCEEDINGS.   The  State  is involved  in certain  legal  proceedings
(described  in the State's recent financial statements) that, if decided against
the State, may require the State to make significant future expenditures or  may
substantially  impair  revenues. Trial  courts  have recently  entered tentative
decisions or  injunctions which  would  overturn several  parts of  the  state's
recent  budget  compromises. The  matters covered  by  these lawsuits  include a
deferral of payments  by the State  to the Public  Employees Retirement  System,
reductions  in welfare payments, and the use  of certain cigarette tax funds for
health costs. All of these cases are subject to further proceedings and appeals,
and if  the State  eventually  loses, the  final remedies  may  not have  to  be
implemented in one year.
 
                                       15
<PAGE>
OBLIGATIONS OF OTHER ISSUERS
 
    OTHER  ISSUERS OF  CALIFORNIA MUNICIPAL OBLIGATIONS.  There are  a number of
state agencies, instrumentalities and political  subdivisions of the State  that
issue  Municipal Obligations, some  of which may  be conduit revenue obligations
payable from  payments from  private borrowers.  These entities  are subject  to
various  economic  risks  and  uncertainties,  and  the  credit  quality  of the
securities issued by them may vary  considerably from the credit quality of  the
obligations backed by the full faith and credit of the State.
 
    STATE  ASSISTANCE.  Property  tax  revenues  received  by  local governments
declined more than 50%  following passage of  Proposition 13. Subsequently,  the
California Legislature enacted measures to provide for the redistribution of the
State's  General Fund  surplus to  local agencies,  the reallocation  of certain
State revenues  to local  agencies and  the assumption  of certain  governmental
functions  by the State  to assist municipal issuers  to raise revenues. Through
1990-91, local assistance (including public schools) accounted for approximately
75% of General Fund  spending. To reduce State  General Fund support for  school
districts,  the  1992-93 and  1993-94 Budget  Acts  caused local  governments to
transfer $3.9 billion of property tax revenues to school districts, representing
loss of all of the post-Proposition 13 "bailout" aid. The largest share of these
transfers came from counties, and the balance from cities, special districts and
redevelopment agencies.  In order  to make  up this  shortfall, the  Legislature
proposed  and  voters approved  in  1993 dedicating  0.5%  of the  sales  tax to
counties and cities for public safety purposes. In addition, the Legislature has
changed laws to relieve local governments of certain mandates, allowing them  to
reduce costs.
 
    To  the  extent  the  State  should  be  constrained  by  its  Article XIIIB
appropriations limit, or its obligation to  conform to Proposition 98, or  other
fiscal  considerations,  the absolute  level, or  the rate  of growth,  of State
assistance to local governments may be reduced. Any such reductions in State aid
could compound the serious fiscal constraints already experienced by many  local
governments,  particularly counties. At least  one rural county (Butte) publicly
announced that it might  enter bankruptcy proceedings  in August 1990,  although
such  plans  were put  off after  the Governor  approved legislation  to provide
additional funds for the county. Other  counties have also indicated that  their
budgetary  condition is  extremely grave.  The Richmond  Unified School District
(Contra Costa  County)  entered  bankruptcy  proceedings in  May  1991  but  the
proceedings have been dismissed.
 
    ASSESSMENT  BONDS.  California  Municipal Obligations  which  are assessment
bonds may be adversely affected by a general decline in real estate values or  a
slowdown in real estate sales activity. In many cases, such bonds are secured by
land  which  is  undeveloped at  the  time  of issuance  but  anticipated  to be
developed within a few years after issuance.  In the event of such reduction  or
slowdown,  such development may not occur  or may be delayed, thereby increasing
the risk of a  default on the  bonds. Because the  special assessments or  taxes
securing  these  bonds are  not  the personal  liability  of the  owners  of the
property assessed, the lien on the property is the only security for the  bonds.
Moreover,  in  most cases  the issuer  of these  bonds is  not required  to make
payments on the bonds in the event of delinquency in the payment of  assessments
or  taxes, except from  amounts, if any,  in a reserve  fund established for the
bonds.
 
    CALIFORNIA LONG-TERM LEASE OBLIGATIONS.  Certain California long-term  lease
obligations, though typically payable from the general fund of the municipality,
are subject to "abatement" in the event the facility being leased is unavailable
for  beneficial use  and occupancy  by the municipality  during the  term of the
lease. Abatement is not a default, and there may
 
                                       16
<PAGE>
be no remedies available to the holders of the certificates evidencing the lease
obligation in the event abatement occurs. The most common cases of abatement are
failure to complete construction  of the facility before  the end of the  period
during  which lease payments have been capitalized and uninsured casualty losses
to the facility (E.G.,  due to earthquake). In  the event abatement occurs  with
respect  to  a  lease obligation,  lease  payments  may be  interrupted  (if all
available insurance proceeds  and reserves are  exhausted) and the  certificates
may not be paid when due.
 
    Several  years  ago the  Richmond Unified  School District  (the "District")
entered into a  lease transaction in  which certain existing  properties of  the
District  were sold and leased back in  order to obtain funds to cover operating
deficits. Following a fiscal crisis in which the District's finances were  taken
over  by  a State  receiver  (including a  brief  period under  bankruptcy court
protection), the  District  failed  to  make  rental  payments  on  this  lease,
resulting  in  a lawsuit  by the  Trustee for  the Certificate  of Participation
holders, in  which the  State was  a named  defendant (on  the grounds  that  it
controlled  the District's  finances). One of  the defenses raised  in answer to
this lawsuit was  the invalidity of  the District's lease.  The trial court  has
upheld  the validity of  the lease and  the case has  been settled. Any ultimate
judgment in any future case against the position asserted by the Trustee in  the
Richmond  case may have adverse implications for lease transactions of a similar
nature by other California entities.
 
    OTHER CONSIDERATIONS.  The repayment  of industrial  development  securities
secured by real property may be affected by California laws limiting foreclosure
rights  of creditors. Securities backed by health care and hospital revenues may
be affected by  changes in  State regulations governing  cost reimbursements  to
health  care providers under Medi-Cal  (the State's Medicaid program), including
risks  related  to  the  policy  of  awarding  exclusive  contracts  to  certain
hospitals.
 
    Limitations  on  AD  VALOREM  property taxes  may  particularly  affect "tax
allocation" bonds issued  by California redevelopment  agencies. Such bonds  are
secured  solely by the increase in assessed valuation of a redevelopment project
area after  the start  of redevelopment  activity. In  the event  that  assessed
values  in the redevelopment  project decline (E.G., because  of a major natural
disaster such as an earthquake), the  tax increment revenue may be  insufficient
to  make principal and  interest payments on  these bonds. Both  Moody's and S&P
suspended ratings  on California  tax allocation  bonds after  the enactment  of
Articles XIIIA and XIIIB, and only resumed such ratings on a selective basis.
 
    Proposition  87, approved  by California voters  in 1988,  requires that all
revenues produced by a tax rate increase go directly to the taxing entity  which
increased  such tax rate to repay that entity's general obligation indebtedness.
As a result, redevelopment  agencies (which, typically, are  the issuers of  tax
allocation securities) no longer receive an increase in tax increment when taxes
on  property in  the project area  are increased to  repay voter-approved bonded
indebtedness.
 
    The effect of these  various constitutional and  statutory changes upon  the
ability of California municipal securities issuers to pay interest and principal
on  their obligations remains unclear. Furthermore, other measures affecting the
taxing or spending authority of California or its political subdivisions may  be
approved  or enacted in  the future. Legislation  has been or  may be introduced
which would modify  existing taxes  or other revenue-raising  measures or  which
either  would further limit  or, alternatively, would  increase the abilities of
state and local governments to impose  new taxes or increase existing taxes.  It
is  not presently possible to  predict the extent to  which any such legislation
will be enacted. Nor is
 
                                       17
<PAGE>
it presently  possible  to determine  the  impact  of any  such  legislation  on
California   Municipal  Obligations  in  which   the  Fund  may  invest,  future
allocations of state revenues to local governments or the abilities of state  or
local  governments  to pay  the interest  on,  or repay  the principal  of, such
California Municipal Obligations.
 
    Substantially all of California is within an active geologic region  subject
to  major seismic activity. Northern California  in 1989 and Southern California
in 1994 experienced major  earthquakes causing billions  of dollars in  damages.
The  federal  government  provided  more  than  $13  billion  in  aid  for  both
earthquakes, and  neither  event is  expected  to have  any  long-term  negative
economic  impact. Any California Municipal  Obligation in the California Insured
Trust could  be affected  by  an interruption  of  revenues because  of  damaged
facilities,  or,  consequently, income  tax  deductions for  casualty  losses or
property tax assessment reductions.  Compensatory financial assistance could  be
constrained  by  the inability  of  (i) an  issuer  to have  obtained earthquake
insurance coverage  at reasonable  rates;  (ii) an  insurer  to perform  on  its
contracts  of insurance in the event of  widespread losses; or (iii) the Federal
or State  government to  appropriate sufficient  funds within  their  respective
budget limitations.
 
    On  January 17, 1994, a major earthquake  with an estimated magnitude of 6.8
on the Richter scale struck the  Los Angeles area, causing significant  property
damage  to public and private facilities, presently estimated at $15-20 billion.
While over $9.5 billion of  federal aid, and a  projected $1.9 billion of  State
aid,  plus insurance proceeds, will  reimburse much of that  loss, there will be
some ultimate loss of wealth and income  in the region, in addition to costs  of
the  disruption  caused  by  the  event.  Short-term  economic  projections  are
generally neutral, as the  infusion of aid will  restore billions of dollars  to
the  local economy within a few  months; already the local construction industry
has picked up. Although the earthquake  will hinder recovery from the  recession
in  Southern California, already hard-hit, its  long-term impact is not expected
to be material in the context of  the overall wealth of the region. Almost  five
years  after the event, there are few  remaining effects of the 1989 Loma Prieta
earthquake in northern  California (which,  however, caused  less severe  damage
than Northridge).
 
    On December 7, 1994, Orange County, California (the "County"), together with
its  pooled  investment  fund (the  "Pooled  Fund") filed  for  protection under
Chapter 9 of the federal Bankruptcy Code, after reports that the Pooled Fund had
suffered significant market losses in its investments caused a liquidity  crisis
for  the Pooled Fund and  the County. More than  180 other public entities, most
but not all located in the County,  were also depositors in the Pooled Fund.  As
of mid-January, 1995, the County estimated the Pooled Fund's loss at about $1.64
billion of its initial deposits of around $7.5 billion. The Pooled Fund has been
almost  completely restructured  to reduce its  exposure to  changes in interest
rates. Many of the entities which kept moneys in the Pooled Fund, including  the
County,  are facing cash flow difficulties  because of the bankruptcy filing and
may be required to reduce programs or  capital projects. The County and some  of
these  entities have, and others may in  the future, default in payment of their
obligations. Moody's  and Standard  & Poor's  have suspended,  reduced to  below
investment  grade levels, or placed on  "Credit Watch" various securities of the
County and the entities participating in the Pooled Fund.
 
    The State of California has no obligation with respect to any obligations or
securities of the County  or any of the  other participating entities,  although
under  existing  legal precedents,  the State  may be  obligated to  ensure that
school districts have sufficient funds to operate.
 
                                       18
<PAGE>
CALIFORNIA TAXABLE ESTIMATED CURRENT RETURN TABLE
 
    The following tables show the approximate taxable estimated current  returns
for  individuals  that are  equivalent to  tax-exempt estimated  current returns
under combined Federal and  state taxes, using  published 1995 marginal  Federal
tax  rates and marginal state tax rates  currently available and scheduled to be
in  effect.  The  tables  incorporate  increased  tax  rates  for  higher-income
taxpayers  that were  included in  the Revenue  Reconciliation Act  of 1993. For
cases in which more than one state  bracket falls within a Federal bracket,  the
highest  state bracket is combined with  the Federal bracket. The combined state
and Federal tax  brackets shown  reflect the fact  that state  tax payments  are
currently  deductible for Federal  tax purposes. The  tables illustrate what you
would have to  earn on  taxable investments  to equal  the tax-exempt  estimated
current  return for your income  tax bracket. A taxpayer's  marginal tax rate is
affected by both his taxable income  and his adjusted gross income. Locate  your
adjusted  gross and  your taxable  income (which  is your  adjusted gross income
reduced by any deductions and exemptions), then locate your tax bracket based on
joint or single  tax filing.  Read across  to the  equivalent taxable  estimated
current return you would need to match the tax-free income.
 
 COMBINED MARGINAL TAX RATES FOR JOINT TAXPAYERS WITH FOUR PERSONAL EXEMPTIONS
--------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL
    FEDERAL      ADJUSTED      COMBINED
    TAXABLE        GROSS      STATE* AND                   TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME        FEDERAL       --------------------------------------------------------------
   (1,000'S)     (1,000'S)     TAX RATE1      4.50%   4.75%   5.00%   5.25%   5.50%   5.75%   6.00%   6.25%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 39.0 $     0-114.7      20.0   %     5.63    5.94    6.25    6.56    6.88    7.19    7.50    7.81
    39.0- 94.3       0-114.7      34.5         6.87    7.25    7.63    8.02    8.40    8.78    9.16    9.54
                 114.7-172.1      35.5         6.98    7.36    7.75    8.14    8.53    8.91    9.30    9.69
    94.3-143.6       0-114.7      37.5         7.20    7.60    8.00    8.40    8.80    9.20    9.60   10.00
                 114.7-172.1      38.5         7.32    7.72    8.13    8.54    8.94    9.35    9.76   10.16
                 172.1-214.9      40.5         7.56    7.98    8.40    8.82    9.24    9.66   10.08   10.50
   143.6-214.9   114.7-172.1      43.0         7.89    8.33    8.77    9.21    9.65   10.09   10.53   10.96
                 172.1-214.9      45.5         8.26    8.72    9.17    9.63   10.09   10.55   11.01   11.47
                 214.9-239.9      46.5         8.41    8.88    9.35    9.81   10.28   10.75   11.21   11.68
                 239.9-294.6      46.0         8.33    8.80    9.26    9.72   10.19   10.65   11.11   11.57
                  Over 294.6      43.5   2     7.96    8.41    8.85    9.29    9.73   10.18   10.62   11.06
   214.9-256.5   172.1-214.9      46.0         8.33    8.80    9.26    9.72   10.19   10.65   11.11   11.57
                 214.9-239.9      47.0         8.49    8.96    9.43    9.91   10.38   10.85   11.32   11.79
                 239.9-294.6      46.5         8.41    8.88    9.35    9.81   10.28   10.75   11.21   11.68
                  Over 294.6      44.0   2     8.04    8.48    8.93    9.38    9.82   10.27   10.71   11.16
   256.5-429.9   239.9-294.6      50.0         9.00    9.50   10.00   10.50   11.00   11.50   12.00   12.50
                  Over 294.6      47.0   3     8.49    8.96    9.43    9.91   10.38   10.85   11.32   11.79
    Over 429.9    Over 294.6      47.5   3     8.57    9.05    9.52   10.00   10.48   10.95   11.43   11.90
</TABLE>
 
                                       19
<PAGE>
  COMBINED MARGINAL TAX RATES FOR SINGLE TAXPAYERS WITH ONE PERSONAL EXEMPTION
--------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL
    FEDERAL      ADJUSTED      COMBINED
    TAXABLE        GROSS      STATE* AND                   TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME        FEDERAL       --------------------------------------------------------------
   (1,000'S)     (1,000'S)     TAX RATE1      4.50%   4.75%   5.00%   5.25%   5.50%   5.75%   6.00%   6.25%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 23.4 $     0-107.5      20.0   %     5.63    5.94    6.25    6.56    6.88    7.19    7.50    7.81
    23.4- 56.6       0-107.5      34.5         6.87    7.25    7.63    8.02    8.40    8.78    9.16    9.54
    56.6-107.5       0-107.5      37.5         7.20    7.60    8.00    8.40    8.80    9.20    9.60   10.00
                 107.5-114.7      38.0         7.26    7.66    8.06    8.47    8.87    9.27    9.68   10.08
                 114.7-132.5      39.5         7.44    7.85    8.26    8.68    9.09    9.50    9.92   10.33
                 132.5-237.2      39.0         7.38    7.79    8.20    8.61    9.02    9.43    9.84   10.25
   107.5-118.0       0-107.5      38.0         7.26    7.66    8.06    8.47    8.87    9.27    9.68   10.08
                 107.5-114.7      38.5         7.32    7.72    8.13    8.54    8.94    9.35    9.76   10.16
                 114.7-132.5      40.0         7.50    7.92    8.33    8.75    9.17    9.58   10.00   10.42
                 132.5-237.2      39.5         7.44    7.85    8.26    8.68    9.09    9.50    9.92   10.33
   118.0-214.9   114.7-132.5      44.5         8.11    8.56    9.01    9.46    9.91   10.36   10.81   11.26
                 132.5-237.2      44.5         8.11    8.56    9.01    9.46    9.91   10.36   10.81   11.26
                  Over 237.2      44.0   2     8.04    8.48    8.93    9.38    9.82   10.27   10.71   11.16
   214.9-256.5   132.5-237.2      45.0         8.18    8.64    9.09    9.55   10.00   10.45   10.91   11.36
                  Over 237.2      44.5   2     8.11    8.56    9.01    9.46    9.91   10.36   10.81   11.26
    Over 256.5    Over 237.2      47.5   3     8.57    9.05    9.52   10.00   10.48   10.95   11.43   11.90
<FN>
------------------
    *  The State tax rates assumed take into account the adjustment  of tax brackets based on changes in the Consumer Price Index
for 1994.
      1 The table reflects the effect of the limitations  on itemized deductions and the deduction for personal exemptions.  They
were  designed to phase out certain benefits of these deductions for higher income taxpayers. These limitations, in effect, raise
the current maximum marginal Federal tax rate to approximately 44.0  percent for taxpayers filing a joint return and entitled  to
four  personal exemptions and to  approximately 41.0 percent for taxpayers  filing a single return  entitled to only one personal
exemption. These limitations are  subject to certain maximums,  which depend on  the number of exemptions  claimed and the  total
amount  of the taxpayer's itemized  deductions. For example, the limitation  on itemized deductions will  not cause a taxpayer to
lose more than 80% of his allowable itemized deductions,  with certain exceptions. The table also reflects California income  tax
laws  that increase state income tax rates for high income taxpayers,  limit itemized deductions and phase out the benefit of the
personal exemption credit and the dependent exemption credit in a manner similar to Federal tax law.
      2 Federal tax rate reverts to 36.0% and the state tax rate reverts to the applicable stated maximum rate after the 80%  cap
on the limitation on itemized deductions, under federal or state law, as appropriate has been met.
      3 Federal tax rate reverts to 39.6% after the 80% cap on the limitation on itemized deductions has been met.
</TABLE>
 
    A  comparison of tax-free  and equivalent taxable  estimated current returns
with the returns on  various taxable investments is  one element to consider  in
making  an  investment  decision. The  Sponsor  may  from time  to  time  in its
advertising and sales materials  compare the then  current estimated returns  on
the Trust and returns over specified periods on other similar Nuveen Trusts with
returns  on taxable investments such as corporate or U.S. Government bonds, bank
CDs 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 CDs 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.
 
                                       20
<PAGE>
   
NUVEEN TAX-EXEMPT UNIT TRUST
SCHEDULE OF INVESTMENTS AT DATE OF DEPOSIT
AUGUST 10, 1995
CALIFORNIA INSURED TRUST 252
(SERIES 817)
    
 
   
<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      Beverly Hills Unified School District, County       2005 at 102        AAA         Aaa     $       474,695
                   of Los Angeles, California, General
                   Obligation Bonds, 1995 Series A, 5.75% Due
                   5/1/20.
    500,000      Castaic Lake Water Agency (California),             2004 at 102        AAA         Aaa             487,825
                   Refunding Revenue Certificates of
                   Participation (Water System Improvement
                   Projects), Series 1994A, 6.00% Due 8/1/18.
    500,000      Los Angeles Convention and Exhibition Center        2003 at 102        AAA         Aaa             431,005
                   Authority (California), Lease Revenue Bonds,
                   1993 Refunding Series A, 5.125% Due 8/15/21.
                   (Original issue discount bonds delivered on
                   or about September 14, 1993 at a price of
                   94.949% of principal amount.)
    500,000      The City of Los Angeles, California, Wastewater     2004 at 102        AAA         Aaa             478,250
                   System Revenue Bonds, Series 1994-A, 5.875%
                   Due 6/1/24.
    500,000      County of Madera, California, Certificates of       2005 at 102        AAA         Aaa             491,790
                   Participation (Valley Children's Hospital
                   Project), Series 1995, 6.125% Due 3/15/23.
    500,000      City of Oceanside, California, 1995 Refunding       2005 at 102        AAA         Aaa             441,100
                   Certificates of Participation (Oceanside
                   Civic Center Project), 5.25% Due 8/1/19.
                   (Original issue discount bonds delivered on
                   or about July 20, 1995 at a price of 89.699%
                   of principal amount.)
    500,000      The City of San Diego, California, Industrial       2003 at 102        AAA         Aaa             481,700
                   Development Revenue Refunding Bonds (San
                   Diego Gas & Electric Company), 1993 Series C,
                   5.90% Due 9/1/18.
-----------                                                                                                 ---------------
$ 3,500,000                                                                                                 $     3,286,365
-----------                                                                                                 ---------------
-----------                                                                                                 ---------------
</TABLE>
    
 
See Notes to Schedules of Investments, page 51.
 
                                       21
<PAGE>
   
MASSACHUSETTS INSURED TRUST 128
    
 
   
    The  Portfolio of Massachusetts Insured Trust  128 consists of 7 obligations
issued by  entities located  in  Massachusetts. Three  Bonds  in the  Trust  are
general  obligations of the governmental entities issuing them and are backed by
the taxing powers thereof. Four 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, 1; Water and/or Sewer  Revenue,
1. All of the Bonds in the Trust, as insured, are rated AAA by Standard & Poor's
and Aaa by Moody's.
    
 
   
    At  the  Date  of  Deposit,  the  average  maturity  of  the  Bonds  in  the
Massachusetts Insured Trust is 23.8 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 August  8,
1995  and August 9, 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>
  $3,345,061       $5,779            $199,375      $3,334,590                 .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  $.01527  per  Unit per  day  under  the  semi-annual  plan  of
distribution,  $.01522 per Unit per day under the quarterly plan of distribution
and $.01513 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  Massachusetts Insured
Trust under the various plans appear in the following table based upon estimated
Net Annual Interest Income at the Date of Deposit:
 
                                       22
<PAGE>
 
   
<TABLE>
<CAPTION>
                                                                                                          NORMAL
                                                                                                      DISTRIBUTIONS
MASSACHUSETTS INSURED TRUST                       1995                             1996                  PER YEAR
<S>                                     <C>            <C>            <C>            <C>            <C>
----------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        9/1           11/1            2/1            5/1
Distribution Date.....................       9/15          11/15           2/15           5/15
--------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .3177(1)                                                  $  5.4479
                                                          --------  $.4539 every month  --------
Quarterly Distribution Plan...........  $   .3177(1)   $   .9132(2)   $  1.3698      $  1.3698        $  5.4799
Semi-Annual Distribution Plan.........  $   .3177(1)   $   .9162(3)                  $  2.7486        $  5.4989
--------------------------------------------------------------------------------------------------------------------
 
<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  2-month distribution;  subsequent  quarterly
    distributions will be regular 3-month distributions.
(3)  The second distribution  under the semi-annual distribution  plan represents a  2-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  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
 
                                       23
<PAGE>
    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
 
                                       24
<PAGE>
various  agencies in Massachusetts. No independent verification has been made of
the accuracy or completeness of the following information.
 
    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.
 
   
    1996 FISCAL  YEAR  BUDGET.__On  June  21,  1995,  the  Governor  signed  the
Commonwealth's  budget for fiscal  1996. The fiscal  1996 budget is  based on an
estimated budgeted revenues and other sources of approximately $16.802  billion,
which  includes  tax  revenue  estimates of  approximately  $11.654  billion, an
increase of  approximately  $475 million,  as  compared to  estimated  1995  tax
revenues  of $11.179 billion. The fiscal  1996 budgeted expenditures are $16.820
billion, which  represents  an  approximately 2.6%  increase  from  fiscal  1995
expenditures.
    
 
   
    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 $16.360 billion,
which includes revised tax revenue  estimates of approximately $11.179  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. On  January 25,  1995,  the Secretary  for Administration  and  Finance
further  revised  the fiscal  1995 tax  revenue estimate  to $11.179  billion, a
reduction of approximately $55 million from the September 26, 1994 estimate. 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
$572 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 $16.449 billion of fiscal 1995 expenditures includes
a reserve  against  certain  contingencies  currently in  the  amount  of  $98.6
million.  On January 25,  1995, the Governor  filed a supplemental appropriation
recommendation aggregating approximately $43.6  million, which expenditures  are
included  in the $98.6 million contingency reserve for fiscal 1995 expenditures.
Included in the approximately $298.2 million of vetoes noted above, the Governor
vetoed approximately $296.9 million in  appropriations for the Executive  Office
of Human Services and the Department of
    
 
                                       25
<PAGE>
   
Public  Welfare, representing the estimate, at the  time, of 4 months of funding
for the Commonwealth's public assistance programs.
    
 
   
    On February 10, 1995,  the Governor signed into  law certain reforms to  the
Commonwealth's  program  for Aid  to Families  with Dependent  Children ("AFDC")
which take  effect on  July 1,  1995,  subject to  federal approval  of  certain
waivers.  The revised program reduces AFDC benefits to able bodied recipients by
2.75%, while  allowing them  to keep  a larger  portion of  their earned  wages,
requires  approximately 22,000  able-bodied parents  of school-aged  children to
work  or  perform  community  service  for  20  hours  per  week  and   requires
approximately  16,000 recipients who  have children between the  ages of two and
six to participate  in an  education or  training program  or perform  community
service.  The plan also establishes a pilot program for up to 2,000 participants
that offers  tax  credits and  wage  subsidies  to employers  who  hire  welfare
recipients.  Parents who find employment will  be provided with extended medical
benefits and day care benefits  for up to one  year. The plan mandates  paternal
identification, expands funding for anti-fraud initiatives, and requires parents
on  AFDC to  immunize their  children. Parents  who are  disabled, caring  for a
disabled child, have a child under the  age of two, or are teen-agers living  at
home  and attending high school, will continue to receive cash assistance. Since
most provisions  of the  new law  do not  take effect  until July  1, 1995,  the
Executive   Office  for  Administration  projects  that  the  reforms  will  not
materially affect  fiscal  1995  public assistance  spending.  The  fiscal  1995
expenditure  estimate of $16.449 billion includes $247.8 million appropriated to
fund the Commonwealth's public assistance programs  for the last four months  of
fiscal  1995. The Commonwealth  is currently evaluating the  new law's impact on
fiscal 1996 projected spending for public assistance programs.
    
 
   
    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.
    
 
   
    1994 FISCAL YEAR.__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
    
 
                                       26
<PAGE>
   
were approximately $15.550 billion. Total  revenues and other sources  increased
by  approximately  5.7%  from fiscal  1993  to  fiscal 1994  while  tax revenues
increased by 6.8% for the same  period. Budgeted expenditures and other uses  of
funds in fiscal 1994 were approximately $15.523 billion, which is $826.5 million
or  approximately 5.6% higher  than fiscal 1993  budgeted expenditures and other
uses.
    
 
   
    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, $625 million in fiscal 1996 and $868
million in fiscal 1997. Additional annual  increases are also expected in  later
fiscal  years. The fiscal  1995 budget as  signed by the  Governor includes $896
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  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,
 
                                       27
<PAGE>
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.
 
                                       28
<PAGE>
    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 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 December 1994 was 5.7%, as compared with the
United States unemployment rate of 5.4% for the same period. Other factors which
may significantly and adversely affect  the employment rate in the  oCmmonwealth
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.
 
                                       29
<PAGE>
    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 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 April
1,  1995  was   approximately  $9.6   billion.  There   were  also   outstanding
approximately  $245 million  in general  obligation notes  and other  short term
general obligation debt. The total bond and note liabilities of the Commonwealth
as of April 1, 1995, including  guaranteed bond and contingent liabilities,  was
approximately $12.9 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 $1.149  billion for fiscal 1993 and 1994,
respectively, and are projected  to be approximately  $1.241 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 5.6% (on a preliminary unaudited  basis) which is projected to increase
to 5.9% in fiscal 1995.
    
 
                                       30
<PAGE>
    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.
 
   
    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 1996  are  $1.044 billion,  representing an
increase of 5.0% over estimated fiscal 1995 expenditures of $994.3 million.
    
 
   
    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  $1.84 billion to be spent on  or
after July 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
 
                                       31
<PAGE>
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 Supreme Judicial
Court heard the appeal on March 7,  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 currently  estimated  to be  approximately  $1.4
billion,  which  amount  includes  interest of  approximately  $1.1  billion and
amounts involved in other  related applications for  abatement pending with  the
Commissioner of Revenue or with the Appellate Tax Board.
    
 
   
    In  March 30, 1995, the parties reported  to the Supreme Judicial Court that
they had agreed  in principle  to settle the  case and  related litigation.  The
agreement  in principle includes an agreement  that the Commonwealth will pay to
the banks $25 million, payable in installments of $10 million on August 1,  1996
and  August 1, 1997, and  $5 million and all  accrued interest on the settlement
amount on August 1,  1998, with an  option for the  Commonwealth to prepay  such
amounts.
    
 
   
    On  March 22,  1995, the  Supreme Judicial Court,  in its  opinion in PERINI
CORPORATION ET AL. V. COMMISSIONER OF REVENUE, held that certain deductions from
the net worth  measure of  the Massachusetts  corporate excise  tax violate  the
Commerce  Clause of the United States  Constitution. The court remanded the case
for entry of a declaration and  further proceedings, if necessary, to  determine
other  appropriate remedies. The  Commonwealth intends to file  a petition for a
writ of certiorari in the United States Supreme Court. The Department of Revenue
is analyzing the impact  of this decision, but  cannot yet determine the  likely
effect  on future aggregate annual corporate  excise tax receipts. 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.
 
                                       32
<PAGE>
    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 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
 
                                       33
<PAGE>
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.
 
                                       34
<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      4.75%   5.00%   5.25%   5.50%   5.75%   6.00%   6.25%   6.50%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 39.0 $     0-114.7      25.0   %     6.33    6.67    7.00    7.33    7.67    8.00    8.33    8.67
    39.0- 94.3       0-114.7      36.5         7.48    7.87    8.27    8.66    9.06    9.45    9.84   10.24
                 114.7-172.1      37.5         7.60    8.00    8.40    8.80    9.20    9.60   10.00   10.40
    94.3-143.6       0-114.7      39.5         7.85    8.26    8.68    9.09    9.50    9.92   10.33   10.74
                 114.7-172.1      40.0         7.92    8.33    8.75    9.17    9.58   10.00   10.42   10.83
                 172.1-294.6      42.0         8.26    8.70    9.13    9.57   10.00   10.43   10.87   11.30
   143.6-256.5   114.7-172.1      44.5         8.56    9.01    9.46    9.91   10.36   10.81   11.26   11.71
                 172.1-294.6      47.0         8.96    9.43    9.91   10.38   10.85   11.32   11.79   12.26
                  Over 294.6      44.5   2     8.56    9.01    9.46    9.91   10.36   10.81   11.26   11.71
    Over 256.5   172.1-294.6      50.5         9.60   10.10   10.61   11.11   11.62   12.12   12.63   13.13
                  Over 294.6      48.0   3     9.13    9.62   10.10   10.58   11.06   11.54   12.02   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      4.75%   5.00%   5.25%   5.50%   5.75%   6.00%   6.25%   6.50%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 23.4 $     0-114.7      25.0   %     6.33    6.67    7.00    7.33    7.67    8.00    8.33    8.67
    23.4- 56.6       0-114.7      36.5         7.48    7.87    8.27    8.66    9.06    9.45    9.84   10.24
    56.6-118.0       0-114.7      39.5         7.85    8.26    8.68    9.09    9.50    9.92   10.33   10.74
                 114.7-237.2      40.5         7.98    8.40    8.82    9.24    9.66   10.08   10.50   10.92
   118.0-256.5   114.7-237.2      45.5         8.72    9.17    9.63   10.09   10.55   11.01   11.47   11.93
                  Over 237.2      44.5   2     8.56    9.01    9.46    9.91   10.36   10.81   11.26   11.71
    Over 256.5    Over 237.2      48.0   3     9.13    9.62   10.10   10.58   11.06   11.54   12.02   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
CDs 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 CDs 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.
 
                                       35
<PAGE>
   
NUVEEN TAX-EXEMPT UNIT TRUST
SCHEDULE OF INVESTMENTS AT DATE OF DEPOSIT
AUGUST 10, 1995
MASSACHUSETTS INSURED TRUST 128
(SERIES 817)
    
 
   
<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     * The Commonwealth of Massachusetts, General         2005 at 101        AAA         Aaa     $       480,000
                   Obligation Bonds, Consolidated Loan of 1995,
                   Series C, 5.625% Due 8/1/14. (When issued.)
    500,000      Massachusetts Bay Transportation Authority,         2004 at 102        AAA         Aaa             486,010
                   General Transportation System Bonds, 1994
                   Series B Bonds, 5.875% Due 3/1/19. (General
                   Obligation Bonds.)
    500,000      Massachusetts Health and Educational Facilities     2005 at 102        AAA         Aaa             492,500
                   Authority, Revenue Bonds, Berkshire Health
                   Systems Issue, Series D, 6.00% Due 10/1/19.
    500,000      Massachusetts Municipal Wholesale Electric          2004 at 102        AAA         Aaa             440,570
                   Company, Power Supply System Revenue Bonds,
                   1994 Series B, 5.00% Due 7/1/13.
    500,000      Massachusetts Water Resources Authority,          2004 at 101 1/2      AAA         Aaa             493,225
                   General Revenue Bonds, 1994 Series A, 6.00%
                   Due 8/1/24.
    500,000      Massachusetts Health and Educational Facilities     2005 at 102        AAA         Aaa             473,080
                   Authority, Revenue Bonds, Harvard University
                   Issue, Series P, 5.625% Due 11/1/28.
    500,000      City of Worcester, Massachusetts, General           2005 at 102        AAA         Aaa             485,455
                   Obligation Bonds, Municipal Purpose Loan of
                   1995, Series C, 5.75% Due 10/1/15.
-----------                                                                                                 ---------------
$ 3,500,000                                                                                                 $     3,350,840
-----------                                                                                                 ---------------
-----------                                                                                                 ---------------
</TABLE>
    
 
See Notes to Schedules of Investments, page 51.
 
   
* These  Bonds,  or a  portion thereof,  have delivery  dates beyond  the normal
  settlement date. Their expected  delivery date is  August 17, 1995.  Contracts
  relating  to  Bonds  with delivery  dates  after  the date  of  settlement for
  purchase made  on the  Date of  Deposit constitute  approximately 14%  of  the
  aggregate principal amount of the Trust. (See Section 4.)
    
 
                                       36
<PAGE>
   
NEW YORK INSURED TRUST 239
    
 
   
    The Portfolio of New York Insured Trust 239 consists of 8 obligations issued
by  entities located in New York. 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, 2; College and University Revenue,
2; 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 and Aaa  by
Moody's.
    
 
   
    At  the Date of Deposit,  the average maturity of the  Bonds in the New York
Insured Trust is 27.2  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.
    
 
   
    Approximately  11.6% of the  aggregate principal amount of  the Bonds in the
Trust (accounting for approximately 11.9% of the aggregate offering price of the
Bonds)   are    original   issue    discount   bonds.    See   "GENERAL    TRUST
INFORMATION--ORIGINAL  ISSUE  DISCOUNT  BONDS AND  STRIPPED  OBLIGATIONS"  for a
discussion of the  characteristics of  such bonds  and of  the risks  associated
therewith.
    
 
    Approximately  28% of  the aggregate  principal amount  of the  Bonds in the
Trust consists of obligations  of issuers whose  revenues are primarily  derived
from  payments  to  colleges  and  universities,  including  tuition,  dormitory
revenues, grants and endorsements.
 
    Approximately 29% of  the aggregate  principal amount  of the  Bonds in  the
Trust  consists of obligations supported by tax revenues specifically pledged to
secure the obligations.
 
    For a discussion of  the risks associated with  investments in the bonds  of
various issuers, see "General Trust Information" in this section.
 
   
    The  Sponsor entered into contracts to acquire  the Bonds on August 9, 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>
  $3,321,264       $18,105           $203,405      $3,322,494                 .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 York Insured Trust, less estimated  expenses, is estimated to accrue at
the rate of $.01559 per Unit per day under the semi-annual plan of distribution,
$.01554 per Unit per  day under the quarterly  plan of distribution and  $.01545
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
    
 
                                       37
<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 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                             1996                  PER YEAR
<S>                                     <C>            <C>            <C>            <C>            <C>
----------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        9/1           11/1            2/1            5/1
Distribution Date.....................       9/15          11/15           2/15           5/15
--------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .3125(1)                                                  $  5.5625
                                                          --------  $.4635 every month  --------
Quarterly Distribution Plan...........  $   .3125(1)   $   .9324(2)   $  1.3986      $  1.3986        $  5.5945
Semi-Annual Distribution Plan.........  $   .3125(1)   $   .9354(3)                  $  2.8062        $  5.6135
--------------------------------------------------------------------------------------------------------------------
<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  2-month distribution;  subsequent  quarterly
    distributions will be regular 3-month distributions.
(3)  The second distribution  under the semi-annual distribution  plan represents a  2-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).
 
                                       38
<PAGE>
        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) 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
 
                                       39
<PAGE>
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,  as  compared to  other  recoveries.  Moderate
economic  growth continued  in calendar year  1994. The State  has projected the
rate of economic growth to slow within New York during 1995, as the expansion of
the national economy moderates. 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.
 
    1995-96 FISCAL YEAR.   The Governor issued a  proposed Executive Budget  for
the  1995-96  fiscal year  (the "Proposed  Budget") on  February 1,  1995, which
projected a  balanced  general fund  and  receipts and  disbursements  of  $32.5
billion  and  $32.4  billion,  respectively.  As  of  May  29,  1995,  the State
legislature had  not yet  enacted,  nor had  the  Governor and  the  legislature
reached  an agreement on, the budget for the 1995-96 fiscal year which commenced
on April 1, 1995. The delay in the enactment of the budget may negatively affect
certain proposed actions and reduce projected savings.
 
    The Proposed Budget and the 1995-96  Financial Plan provide for the  closing
of  a  projected  $4.7  billion  budget  gap  in  the  1995-96  fiscal  year  by
cost-containment savings in social welfare  programs, savings from State  agency
restructurings,  freezing  the level  of some  categories of  local aid  and new
revenue measures.
 
    The State's proposed budget and the 1995-96 Plan may be impacted  negatively
by  uncertainties relating to  the economy and  tax collections, although recent
signs of improvement in the national economy could lead to short-term  increases
in State receipts.
 
    1994-1995  FISCAL YEAR.   The State Legislature  enacted the State's 1994-95
fiscal year budget on June 7, 1994, more than two months after the start of that
fiscal year. As of  February 1, 1995, the  updated 1994-95 State Financial  Plan
(the  "Plan") projected total  general fund receipts  and disbursements of $33.3
billion and $33.5 billion, respectively, representing reductions in receipts and
disbursements of $1 billion and $743 million, respectively, from the amount  set
forth  in the 1994-95 budget.  The Plan projected for  a General Fund balance of
approximately $157 million at the close of the 1994-95 fiscal year.
 
    1993-94 FISCAL  YEAR.   The State  ended  the 1993-94  fiscal year  with  an
operating surplus of approximately $1.0 billion.
 
    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  March 31,  1994, the  total amount  of long-term  State
general obligation debt authorized but unissued stood at $2.0 billion. As of the
same  date, the State had approximately $5.4 billion in general obligation bonds
including $224 million of Bond Anticipation Notes outstanding.
 
    The State  originally projected  that its  borrowings for  capital  purposes
during  the State's 1994-95 fiscal year would consist of $374 million in general
obligation bonds  and  bond  anticipation  notes and  $140  million  in  general
obligation  commercial paper. The Legislature has  authorized the issuance of up
to $69 million in certificates of participation in pools of leases for equipment
and  real  property  to  be  utilized  by  State  agencies.  Through  March  15,
 
                                       40
<PAGE>
1995,  the State had issued in excess  of $590 million of its general obligation
bonds (including $430 million of refunding bonds). The projections of the  State
regarding  its borrowings for  any fiscal year  are subject to  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 March 31, 1994, LGAC has issued its bonds to provide net proceeds of  $4.5
billion. The LGAC was authorized to provide net proceeds of $315 million, during
the  State's 1994-95 fiscal year. The LGAC issued $347 million of bonds on March
1, 1995 providing the authorized net proceeds.
 
    Financing of capital programs  by other public authorities  of the State  is
also   obtained   from  lease-purchase   and   contractual-obligation  financing
arrangements, the debt service for which  is paid from State appropriations.  As
of March 31, 1994, there were $16.6 billion of such other financing arrangements
outstanding  and additional financings of this  nature by public authorities are
projected to total  $2.4 billion during  the 1994-95 fiscal  year. In  addition,
certain agencies had issued and outstanding approximately $7.3 billion of "moral
obligation financings" as of March 31, 1994, which are to be repaid from project
revenues.  While there has never been a  default on moral obligation debt of the
State, the State would be required to make up any shortfall in debt service.
 
    RATINGS.  The $850 million in TRANS  issued by the State in April 1993  were
rated  SP-1-Plus by S&P and MIG-1 by Moody's which represent 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
February 28, 1994,  and S&P's  rating stood  at A-  with a  positive outlook  on
February  28, 1994,  an improvement  from S&P's  stable outlook  from April 1993
through February  1994 and  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  $537 million of its general obligation
bonds in March 1995.
 
    (2) THE  CITY AND  THE MUNICIPAL  ASSISTANCE CORPORATION  ("MAC"): The  City
accounts  for approximately 40%  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 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")).
 
    In   recent  years,  the  rate  of   economic  growth  in  the  City  slowed
substantially as the City's economy entered a recession. While by some  measures
the  City's economy may  have begun to  recover, a number  of factors, including
poor performance  by the  City's  financial services  companies, may  prevent  a
significant improvement in the City's economy and may
 
                                       41
<PAGE>
in fact negatively impact upon the City's finances by reducing tax receipts. The
City  Comptroller has issued reports concluding that the recession of the City's
economy may  be  ending,  but  there  is  little  prospect  of  any  significant
improvement in the near term.
 
    FISCAL  YEAR 1996 AND THE  1995-1998 FINANCIAL PLAN.   On February 14, 1995,
the Mayor released his  preliminary $30.5 billion budget  for fiscal year  1996,
which  included $2.7 billion of deficit reduction measures. The Mayor is seeking
a $1.2 billion reduction in mandated welfare and Medicaid expenditures from  the
State,  a $569 million reduction in expenditures  by city agencies and the Board
of Education budget, $600  million in personnel  related savings partly  through
the elimination of 15,000 jobs within 18 months, and other measures.
 
    The  1995-1998  Financial  Plan (the  "Plan"),  which was  submitted  to the
Control Board on February  23, 1995, projected budget  gaps of $3.2 billion  and
$3.8  billion for fiscal years 1997 and 1998, respectively. The City Comptroller
warned on March 7, 1995 that the budget gap for fiscal year 1996 could  increase
by  $500 million to as much as $3.2 billion. The Control Board reported on March
17, 1995 that the proposed budget for  fiscal year 1996 relies heavily on  risky
assumptions  such as $600 million  in savings to be  negotiated with City unions
and $1.4 billion in savings dependent on State legislative approval.
 
    The City  successfully negotiated  concessions with  a number  of unions  in
order  to ensure that the fiscal year 1995 budget remained in balance. The Mayor
has indicated that to avoid additional lay-offs, higher than the number referred
to above, reductions will be necessary in the benefit plans of City employees to
close the budget gaps for fiscal years 1996 and thereafter. Union leadership has
publicly opposed such "givebacks". With respect to fiscal year 1995 the City was
also successful in obtaining additional  funds and relief from certain  mandated
expenditures  from the State for  various programs, including Medicaid. However,
the amount of gap closing measures requiring State action set forth in the  Plan
is  well in excess of proposed assistance to the City outlined in the Governor's
Proposed Budget.
 
    The Mayor has directed City agencies to identify an additional $300  million
in  cuts for fiscal  year 1996 because  of anticipated shortfalls  of as much as
$500 million in State aid and budgetary actions. An extended delay by the  State
in  adopting its  1995-96 fiscal  year budget  would negatively  impact upon the
City's financial condition  and ability to  close budget gaps  for fiscal  years
1996 and thereafter.
 
    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.
 
    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
1995-96 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 the  1996-97 or  future fiscal  years will  be
adopted
 
                                       42
<PAGE>
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 the 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 the 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  1996 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 1995  through  1998  contemplates capital
spending of $16.4  billion, which  will be  financed through  issuance of  $10.7
billion  of general  obligation bonds  and the  balance through  Water Authority
Revenue Bonds  and  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 YEAR 1995.  New York City adopted its fiscal year 1995 budget on June
21, 1994, which provided for spending of  $31.6 billion and closed a budget  gap
of  $2.3 billion.  However, following adoption  of the fiscal  year 1995 budget,
additional unexpected  budget  gaps  totaling approximately  $2.0  billion  were
identified.  The widening of the  budget gap for fiscal  year 1995 resulted from
shortfalls in tax revenues  and State and  federal aid. The  Mayor and the  City
Council  were unable to reach agreement on additional cuts proposed by the Mayor
in October 1994. The City Council passed its own budget cut proposal in November
1994. The Mayor vetoed the City  Council version, the City Council overrode  his
veto and the Mayor implemented his original plan. A state court held in December
1994  that  neither budget  cut proposal  could be  implemented. The  Mayor then
elected not to spend certain funds in order to keep the budget in balance.
 
    FISCAL YEARS  1990  THROUGH 1994.    The City  achieved  balanced  operating
results  as reported in accordance  with GAAP for its  fiscal years 1990 through
1994. The City was
 
                                       43
<PAGE>
required to close  substantial budget  gaps in  these fiscal  years to  maintain
balanced operating results.
 
    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 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, 1994, the City estimated its potential future liability to
be $2.6 billion.
 
    On January  30, 1995,  Robert L.  Schulz and  other defendants  commenced  a
federal district court action seeking among other matters to cancel the issuance
on January 31, 1995 of $659 million of City bonds. While the federal courts have
rejected  requests for temporary  restraining orders and  expedited appeals, the
case is still pending. The City has indicated that it believes the action to  be
without merit as it relates to the City, but there can be no assurance as to the
outcome  of the litigation and an adverse  ruling or the granting of a permanent
injunction would have a  negative impact on the  City's financial condition  and
its ability to fund its operations.
 
    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  BBB+.  On
February  11, 1991,  Moody's had  lowered its rating  from A.  S&P's lowered its
rating from A-  on July  10, 1995  after placing  the City  on "negative  credit
watch" in January 1995.
 
    On  March 13, 1995, Moody's  confirmed its Baa1 rating  in connection with a
scheduled March  1995 sale  of $795  million of  the City's  general  obligation
bonds.
 
    In  dropping  the City's  rating in  July 1995,  S&P's cited  the "sluggish"
economy and the poor  outlook for job  growth, as well as  the continued use  of
"one-time  measures" to close budget gaps. The lowered rating could increase the
City's borrowing costs by forcing it to offer higher interest rates on its bonds
thereby adding further pressures to the City's budget problems. In addition, the
lowered rating may prevent certain  institutional investors from purchasing  the
City's  bonds reducing demand  for future offerings, which  could also force the
City to increase interest rates on its bonds.
 
    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 December 31, 1994, the  City and MAC had, respectively, $22.5  billion
and $4.1 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
 
                                       44
<PAGE>
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.
 
    As  of  September 30,  1993,  the State  reported  that there  were eighteen
Agencies that each had outstanding debt of $100 million or more and an aggregate
of $63.5  billion  of  outstanding  debt, some  of  which  was  state-supported,
state-related debt.
 
    (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   State  has  entered   into  a  settlement   agreement  with  Delaware,
Massachusetts and all other parties with  respect to STATE OF DELAWARE V.  STATE
OF  NEW  YORK, an  action  by Delaware  and  other states  to  recover unclaimed
property from New York-based brokers, which has escheated to the State  pursuant
to  its ABANDONED  PROPERTY LAW. Annual  payments under this  settlement will be
made through the  State's 2002-03  fiscal year  in amounts  not exceeding  $48.4
million in any fiscal year subsequent to the State's 1994-95 fiscal year.
 
    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.
 
    Petitioners in SCHULZ 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. On June
30, 1994, the Court of Appeals, the State's highest court, upheld the  decisions
of  the Supreme Court  and Appellate Division in  SCHULZ, Plaintiffs' motion for
reargument was denied by  the Court of  Appeals on September  1, 1994 and  their
writ of certiorari to the U.S. Supreme Court was denied on January 23, 1995.
 
    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
1994-95 fiscal years.
 
                                       45
<PAGE>
    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 1992, the  total indebtedness of all localities in
the State was approximately  $35.2 billion, of which  $19.5 billion was debt  of
New  York City  (excluding $5.9  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.  Seventeen  localities  had  outstanding  indebtedness  for   state
financing at the close of their fiscal year ending in 1992.
 
    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.
 
                                       46
<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      4.75%   5.00%   5.25%   5.50%   5.75%   6.00%   6.25%   6.50%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 39.0 $     0-100.0     21.5    %     6.05    6.37    6.69    7.01    7.32    7.64    7.96    8.28
                 100.0-114.7     22.5          6.13    6.45    6.77    7.10    7.42    7.74    8.06    8.39
    39.0- 94.3       0-100.0     33.5          7.14    7.52    7.89    8.27    8.65    9.02    9.40    9.77
                 100.0-114.7     34.5          7.25    7.63    8.02    8.40    8.78    9.16    9.54    9.92
                 114.7-150.0     35.0          7.31    7.69    8.08    8.46    8.85    9.23    9.62   10.00
                 150.0-172.1     34.0          7.20    7.58    7.95    8.33    8.71    9.09    9.47    9.85
    94.3-143.6       0-100.0     36.0          7.42    7.81    8.20    8.59    8.98    9.38    9.77   10.16
                 100.0-114.7     37.0          7.54    7.94    8.33    8.73    9.13    9.52    9.92   10.32
                 114.7-150.0     38.0          7.66    8.06    8.47    8.87    9.27    9.68   10.08   10.48
                 150.0-172.1     37.0          7.54    7.94    8.33    8.73    9.13    9.52    9.92   10.32
                 172.1-294.6     39.5          7.85    8.26    8.68    9.09    9.50    9.92   10.33   10.74
   143.6-256.5   114.7-150.0     42.5          8.26    8.70    9.13    9.57   10.00   10.43   10.87   11.30
                 150.0-172.1     42.0          8.19    8.62    9.05    9.48    9.91   10.34   10.78   11.21
                 172.1-294.6     44.5          8.56    9.01    9.46    9.91   10.36   10.81   11.26   11.71
                  Over 294.6     42.0    2     8.19    8.62    9.05    9.48    9.91   10.34   10.78   11.21
    Over 256.5   172.1-294.6     48.0          9.13    9.62   10.10   10.58   11.06   11.54   12.02   12.50
                  Over 294.6     45.5    3     8.72    9.17    9.63   10.09   10.55   11.01   11.47   11.93
</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      4.75%   5.00%   5.25%   5.50%   5.75%   6.00%   6.25%   6.50%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 23.4 $     0-100.0     21.5    %     6.05    6.37    6.69    7.01    7.32    7.64    7.96    8.28
                 100.0-114.7     22.0          6.09    6.41    6.73    7.05    7.37    7.69    8.01    8.33
    23.4- 56.6       0-100.0     33.5          7.14    7.52    7.89    8.27    8.65    9.02    9.40    9.77
                 100.0-114.7     34.0          7.20    7.58    7.95    8.33    8.71    9.09    9.47    9.85
    56.6-118.0       0-100.0     36.0          7.42    7.81    8.20    8.59    8.98    9.38    9.77   10.16
                 100.0-114.7     36.5          7.48    7.87    8.27    8.66    9.06    9.45    9.84   10.24
                 114.7-150.0     38.0          7.66    8.06    8.47    8.87    9.27    9.68   10.08   10.48
                 150.0-237.2     37.5          7.60    8.00    8.40    8.80    9.20    9.60   10.00   10.40
   118.0-256.5   114.7-150.0     43.0          8.33    8.77    9.21    9.65   10.09   10.53   10.96   11.40
                 150.0-237.2     42.5          8.26    8.70    9.13    9.57   10.00   10.43   10.87   11.30
                  Over 237.2     42.0    2     8.19    8.62    9.05    9.48    9.91   10.34   10.78   11.21
    Over 256.5    Over 237.2     45.5    3     8.72    9.17    9.63   10.09   10.55   11.01   11.47   11.93
</TABLE>
 
                                       47
<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      4.75%   5.00%   5.25%   5.50%   5.75%   6.00%   6.25%   6.50%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 39.0 $     0-100.0     25.0    %     6.33    6.67    7.00    7.33    7.67    8.00    8.33    8.67
                 100.0-114.7     26.0          6.42    6.76    7.09    7.43    7.77    8.11    8.45    8.78
    39.0- 94.3       0-100.0     36.5          7.48    7.87    8.27    8.66    9.06    9.45    9.84   10.24
                 100.0-114.7     37.5          7.60    8.00    8.40    8.80    9.20    9.60   10.00   10.40
                 114.7-150.0     38.0          7.66    8.06    8.47    8.87    9.27    9.68   10.08   10.48
                 150.0-172.1     37.5          7.60    8.00    8.40    8.80    9.20    9.60   10.00   10.40
    94.3-143.6       0-100.0     39.5          7.85    8.26    8.68    9.09    9.50    9.92   10.33   10.74
                 100.0-114.7     40.0          7.92    8.33    8.75    9.17    9.58   10.00   10.42   10.83
                 114.7-150.0     41.0          8.05    8.47    8.90    9.32    9.75   10.17   10.59   11.02
                 150.0-172.1     40.0          7.92    8.33    8.75    9.17    9.58   10.00   10.42   10.83
                 172.1-294.6     42.5          8.26    8.70    9.13    9.57   10.00   10.43   10.87   11.30
   143.6-256.5   114.7-150.0     45.5          8.72    9.17    9.63   10.09   10.55   11.01   11.47   11.93
                 150.0-172.1     44.5          8.56    9.01    9.46    9.91   10.36   10.81   11.26   11.71
                 172.1-294.6     47.0          8.96    9.43    9.91   10.38   10.85   11.32   11.79   12.26
                  Over 294.6     44.5    2     8.56    9.01    9.46    9.91   10.36   10.81   11.26   11.71
    Over 256.5   172.1-294.6     50.5          9.60   10.10   10.61   11.11   11.62   12.12   12.63   13.13
                  Over 294.6     48.0    3     9.13    9.62   10.10   10.58   11.06   11.54   12.02   12.50
</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      4.75%   5.00%   5.25%   5.50%   5.75%   6.00%   6.25%   6.50%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 23.4 $     0-100.0     25.0    %     6.33    6.67    7.00    7.33    7.67    8.00    8.33    8.67
                 100.0-114.7     25.5          6.38    6.71    7.05    7.38    7.72    8.05    8.39    8.72
    23.4- 56.6       0-100.0     36.5          7.48    7.87    8.27    8.66    9.06    9.45    9.84   10.24
                 100.0-114.7     37.0          7.54    7.94    8.33    8.73    9.13    9.52    9.92   10.32
    56.6-118.0       0-100.0     39.5          7.85    8.26    8.68    9.09    9.50    9.92   10.33   10.74
                 100.0-114.7     39.5          7.85    8.26    8.68    9.09    9.50    9.92   10.33   10.74
                 114.7-150.0     41.0          8.05    8.47    8.90    9.32    9.75   10.17   10.59   11.02
                 150.0-237.2     40.5          7.98    8.40    8.82    9.24    9.66   10.08   10.50   10.92
   118.0-256.5   114.7-150.0     45.5          8.72    9.17    9.63   10.09   10.55   11.01   11.47   11.93
                 150.0-237.2     45.5          8.72    9.17    9.63   10.09   10.55   11.01   11.47   11.93
                  Over 237.2     44.5    2     8.56    9.01    9.46    9.91   10.36   10.81   11.26   11.71
    Over 256.5    Over 237.2     48.0    3     9.13    9.62   10.10   10.58   11.06   11.54   12.02   12.50
</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>
 
                                       48
<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
CDs 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 CDs 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.
 
                                       49
<PAGE>
   
NUVEEN TAX-EXEMPT UNIT TRUST
SCHEDULE OF INVESTMENTS AT DATE OF DEPOSIT
AUGUST 10, 1995
NEW YORK INSURED TRUST 239
(SERIES 817)
    
 
   
<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      Dormitory Authority of the State of New York,       2004 at 102        AAA         Aaa     $       425,955
                   Mount Sinai School of Medicine, Insured
                   Revenue Bonds, Series 1994A, 5.00% Due
                   7/1/21.
    495,000      Dormitory Authority of the State of New York,       2004 at 102        AAA         Aaa             445,812
                   State University Educational Facilities
                   Revenue Bonds, Series 1993C, 5.40% Due
                   5/15/23.
    100,000      New York State Medical Care Facilities Finance      2004 at 102        AAA         Aaa             102,500
                   Agency, Mental Health Services Facilities
                   Improvement Revenue Bonds, 1994 Series E,
                   6.50% Due 8/15/24. (General Obligation
                   Bonds.)
    500,000      New York State Thruway Authority, Highway and       2005 at 102        AAA         Aaa             471,335
                   Bridge Trust Fund Bonds, Series 1995A, 5.50%
                   Due 4/1/15.
    500,000      Dormitory Authority of the State of New York,       2005 at 102        AAA         Aaa             493,240
                   Comsewogue Public Library, Insured Revenue
                   Bonds, Series 1995, 6.05% Due 7/1/24.
    500,000      The City of New York (New York), General            2005 at 101        AAA         Aaa             517,295
                   Obligation Bonds, Fiscal 1995 Series F,
                   6.625% Due 2/15/25.
    405,000      Metropolitan Transportation Authority (New        2004 at 101 1/2      AAA         Aaa             396,807
                   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 94.875% of principal
                   amount.)
    500,000     * New York City, New York, Municipal Water           2005 at 101        AAA         Aaa             486,425
                   Finance Authority, Water and Sewer System
                   Revenue Bonds, Fiscal 1996 Series A, 6.00%
                   Due 6/15/25. (When issued.)
-----------                                                                                                 ---------------
$ 3,500,000                                                                                                 $     3,339,369
-----------                                                                                                 ---------------
-----------                                                                                                 ---------------
</TABLE>
    
 
See Notes to Schedules of Investments, page 51.
 
   
* These  Bonds,  or a  portion thereof,  have delivery  dates beyond  the normal
  settlement date. Their expected  delivery date is  August 16, 1995.  Contracts
  relating  to  Bonds  with delivery  dates  after  the date  of  settlement for
  purchase made  on the  Date of  Deposit constitute  approximately 14%  of  the
  aggregate principal amount of the Trust. (See Section 4.)
    
 
                                       50
<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
        and Aaa by Moody's. (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.
 
                                       51
<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 817:
    
 
   
       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  817
     (comprising California Insured Trust 252, Massachusetts Insured  Trust
     128  and New  York Insured  Trust 239), as  of August  10, 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 817
     as  of  August  10,  1995,  in  conformity  with  generally   accepted
     accounting principles.
    
 
                                                        ARTHUR ANDERSEN LLP
 
   
     Chicago, Illinois,
     August 10, 1995.
    
 
                                       52
<PAGE>
                            Statements of Condition
   
                    NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 817
    
   
  (California Insured Trust 252, Massachusetts Insured Trust 128 and New York
                               Insured Trust 239)
    
   
                             AS OF AUGUST 10, 1995
    
 
   
<TABLE>
<CAPTION>
                                            CALIFORNIA         MASSACHUSETTS         NEW YORK
                                              INSURED             INSURED             INSURED
    TRUST PROPERTY                           TRUST 252           TRUST 128           TRUST 239
<S>                                       <C>                 <C>                 <C>
                                          ---------------     ---------------     ---------------
Sponsor's contracts to purchase
 Tax-Exempt Bonds, backed by an
 irrevocable letter of credit(1)(2).....  $     3,286,365     $     3,350,840     $     3,339,369
Accrued interest to August 10, 1995 on
  underlying Bonds(1)...................           44,743              36,606              43,261
Organizational costs(3).................            5,100               5,100               5,100
                                          ---------------     ---------------     ---------------
            Total.......................  $     3,336,208     $     3,392,546     $     3,387,730
                                          ---------------     ---------------     ---------------
                                          ---------------     ---------------     ---------------
   LIABILITY AND INTEREST OF UNITHOLDERS
LIABILITY:
    Accrued interest to August 10, 1995
      on underlying Bonds(4)............  $        44,743     $        36,606     $        43,261
    Accrued organizational costs(3).....            5,100               5,100               5,100
                                          ---------------     ---------------     ---------------
            Total.......................  $        49,843     $        41,706     $        48,361
                                          ---------------     ---------------     ---------------
                                          ---------------     ---------------     ---------------
INTEREST OF UNITHOLDERS:
    Units of fractional undivided
      interest outstanding (California
      Insured Trust 252-- 35,000;
      Massachusetts Insured Trust 128--
      35,000; New York Insured Trust
      239--35,000)
      Cost to investors(5)..............  $     3,455,679     $     3,523,475     $     3,511,413
        Less: Gross underwriting
          commission(6).................         (169,314)           (172,635)           (172,044)
                                          ---------------     ---------------     ---------------
    Net amount applicable to
      investors.........................  $     3,286,365     $     3,350,840     $     3,339,369
                                          ---------------     ---------------     ---------------
            Total.......................  $     3,336,208     $     3,392,546     $     3,387,730
                                          ---------------     ---------------     ---------------
                                          ---------------     ---------------     ---------------
<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) Each Trust  (and therefore  Unitholders) will bear  all or  a portion  of its estimated  organizational costs  which will  be
    deferred and amortized over five years from the Initial Date of Deposit.
(4) 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.
(5) Aggregate Public Offering Price (exclusive of accrued interest) computed as set forth under Section 6.
(6) 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>
    
 
                                       53
<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 MBIA Insurance 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,  formerly   known  as  Municipal   Bond  Investors  Assurance
Corporation, 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
 
                                      A-10
<PAGE>
of  Columbia, the Commonwealth of Puerto  Rico, the Commonwealth of the Northern
Mariana Islands, the Virgin  Islands of the United  States and the Territory  of
Guam. The Insurer has one European branch in the Republic of France.
 
    As  of  March 31,  1995  the Insurer  had  admitted assets  of  $3.5 billion
(unaudited), total liabilities  of $2.4 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.  As of December 31,  1994, the Insurer had  admitted assets of $3.4
billion (audited),  total  liabilities  of $2.3  billion  (audited),  and  total
capital  and surplus  of $1.1  billion (audited)  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  rates all  new issues  insured by  the Association "AAA"
Prime Grade.
 
                                      A-11
<PAGE>
    Moody's rates all  bond issues insured  by the Association  "Aaa" and  short
term loans "MIG 1", both designated to be of the highest quality.
 
    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  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 rates  all new issues insured  by the Insurer "AAA"  Prime
Grade."
 
    The  Moody's rating of the Insurer  should be evaluated independently of the
Standard & Poor's 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. The Insurer  does
not  guarantee the  market price  of the  Bonds nor  does it  guarantee that the
ratings on the Bonds will not be reversed or withdrawn.
 
    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 and/or  "AAA" by  Standard  & Poor's  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"), MBIA  Insurance 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
 
                                      A-12
<PAGE>
the preceding disclosure  regarding MBIA). There  can be no  assurance that  any
insurer  listed therein  will be  able to satisfy  its commitments  in the event
claims are  made  in  the future.  However,  Standard  & Poor's  has  rated  the
claims-paying  ability of  each insurer "AAA,"  and Moody's has  rated all bonds
insured by each such insurer, except ConnieLee, "Aaa." Moody's 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
 
                                      A-13
<PAGE>
amounts which would have been paid if the higher sales charge had been  applied.
If  such Unitholder  does not  pay the  additional amount  within 20  days after
written request by  the Sponsor or  the Unitholder's securities  representative,
the  Sponsor will instruct  the Trustee to  redeem an appropriate  number of the
escrowed units to meet the required payment. By establishing a letter of intent,
a Unitholder irrevocably appoints the  Sponsor as attorney to give  instructions
to  redeem any or  all of such  Unitholder's escrowed units,  with full power of
substitution in the premises. A Unitholder or his securities representative must
notify the Sponsor whenever  such Unitholder makes a  purchase of Units that  he
wishes  to  be counted  towards the  intended amount.  Sales charges  during the
primary offering period are as follows:
 
<TABLE>
<CAPTION>
                                                         NATIONAL AND STATE      LONG INTERMEDIATE
                                                               TRUSTS                  TRUSTS           INTERMEDIATE TRUSTS
                                                       ----------------------  ----------------------  ----------------------
<S>                                                    <C>          <C>        <C>          <C>        <C>          <C>
                                                         PERCENT     PERCENT     PERCENT     PERCENT     PERCENT     PERCENT
                                                           OF        OF NET        OF        OF NET        OF        OF NET
                                                        OFFERING     AMOUNT     OFFERING     AMOUNT     OFFERING     AMOUNT
                  NUMBER OF UNITS*                        PRICE     INVESTED      PRICE     INVESTED      PRICE     INVESTED
-----------------------------------------------------  -----------  ---------  -----------  ---------  -----------  ---------
Less than 500........................................        4.90%      5.152%       4.25%      4.439%       3.90%      4.058%
500 but less than 1,000..............................        4.75       4.987        4.15       4.330        3.70       3.842
1,000 but less than 2,500............................        4.50       4.712        3.85       4.004        3.50       3.627
2,500 but less than 5,000............................        4.25       4.439        3.60       3.734        3.25       3.359
5,000 but less than 10,000...........................        3.50       3.627        3.35       3.466        3.00       3.093
10,000 but less than 25,000..........................        3.00       3.093        3.00       3.093        2.75       2.828
25,000 but less than 50,000..........................        2.50       2.564        2.50       2.564        2.50       2.564
50,000 or more.......................................        2.00       2.041        2.00       2.041        2.00       2.041
</TABLE>
 
<TABLE>
<CAPTION>
                                                         SHORT INTERMEDIATE
                                                               TRUSTS            SHORT TERM TRUSTS
                                                       ----------------------  ----------------------
<S>                                                    <C>          <C>        <C>          <C>        <C>          <C>
                                                         PERCENT     PERCENT     PERCENT     PERCENT
                                                           OF        OF NET        OF        OF NET
                                                        OFFERING     AMOUNT     OFFERING     AMOUNT
                  NUMBER OF UNITS*                        PRICE     INVESTED      PRICE     INVESTED
-----------------------------------------------------  -----------  ---------  -----------  ---------
Less than 500........................................        3.00%      3.093%       2.50%      2.564%
500 but less than 1,000..............................        2.80       2.881        2.30       2.354
1,000 but less than 2,500............................        2.60       2.670        2.10       2.145
2,500 but less than 5,000............................        2.35       2.407        1.85       1.885
5,000 but less than 10,000...........................        2.10       2.145        1.60       1.626
10,000 but less than 25,000..........................        1.85       1.885        1.35       1.368
25,000 but less than 50,000..........................        1.80       1.833        1.25       1.266
50,000 or more.......................................        1.50       1.523        1.15       1.163
</TABLE>
 
*Breakpoint sales charges are computed both on  a dollar basis and on the  basis
 of the number of Units purchased, using the equivalent of 500 Units to $50,000,
 2,500  Units to $250,000 etc., and will be  applied on that basis which is more
 favorable to the purchaser.
 
    For "secondary market"  sales the  Public Offering  Price per  Unit of  each
Trust is determined by adding to the Trustee's determination of the BID price of
each  Bond in the Trust  a sales charge determined  in accordance with the table
set forth below based upon the number of years remaining to the maturity of each
such Bond, adjusting  the total to  reflect the amount  of any cash  held in  or
advanced  to the principal account  of the Trust and  dividing the result by the
number of Units then outstanding. For  purposes of this calculation, Bonds  will
be  deemed to mature on  their stated maturity dates  unless: (a) the Bonds have
been called for redemption or funds or securities have been placed in escrow  to
redeem  them on  an earlier  call date, in  which case  such call  date shall be
deemed to be the date upon which they mature; or (b) such Bonds are subject to a
"mandatory put," in which case such mandatory put date shall be deemed to be the
date upon  which  they  mature.  Any assumptions  regarding  maturity  made  for
purposes  of  determining the  appropriate  sales charge  in  no way  predict or
guarantee the actual remaining life of a given Trust.
 
    Pursuant to the terms of the Indenture, the Trustee may terminate a Trust if
the net asset value of such Trust, as shown by any evaluation, is less than  20%
of the original
 
                                      A-14
<PAGE>
principal  amount of the Trust. In the  course of regularly appraising the value
of Bonds in 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 will
be added to the Public Offering Price to determine the purchase price of  Units.
The date of settlement is currently three business days after purchase.
 
    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 as  the  Trustee can  complete the  mechanics  of
registration.  The date  of settlement  is currently  three business  days after
purchase. 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
 
                                      A-17
<PAGE>
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  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, less  any distributions from the related
Interest Account. The date of settlement is currently three business days  after
purchase.  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 third 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.
 
                                      A-18
<PAGE>
    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 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.
 
   
    All or  a portion  of  the expenses  incurred  in establishing  the  Trusts,
including costs of preparing the registration statement, the trust indenture and
other  closing  documents, registering  Units with  the Securities  and Exchange
Commission and states, the initial audit of each Trust portfolio, legal fees and
the initial  fees  and  expenses  of the  Trustee  and  any  other  non-material
out-of-pocket  expenses, will be paid by the Trusts and amortized over the first
five years of such 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.
    
 
                                      A-23
<PAGE>
    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 $.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
 
                                      A-24
<PAGE>
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  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
 
                                      A-25
<PAGE>
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 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
 
                                      A-26
<PAGE>
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  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
 
                                      A-27
<PAGE>
bonds  rated  "baa" or  "BBB" or  better, limited  to  no more  than 20%  of the
Multistate Trust's 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
 
                                      A-28
<PAGE>
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;
(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 third business day following the date of tender, 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 third 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.  A description of the applicable Standard & Poor's 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  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.  A brief description of  the applicable Moody's 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>
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                                      A-42
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                                      A-43
<PAGE>
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                                      A-44
<PAGE>
 
   
<TABLE>
<C>                <S>        <C>
           NUVEEN             Tax-Exempt Unit Trusts
 
                           PROSPECTUS
                           105,000 Units
                           California Insured Trust 252
                           Massachusetts Insured Trust
                           128
                           New York Insured Trust 239
</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.
 
   
   817
    
<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 cross-reference 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 817 hereby
identifies Series 401, 507, 512, 515, 517, 519, 723 and 814 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 817 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 8/10/95.

 
                                NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 817
                                (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))
                                                      )
                                                      )8/10/95
___________________

*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>

817

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

    The consent of Arthur Anderson LLP to the use of its name in the Prospectus
included in the Registration Statement is filed by this amendment as Exhibit
4.4 to the Registratin Statement.
                       
                        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,
                     A DIVISION OF THE MCGRAW-HILL COMPANIES 

    The consent of Standard & Poor's, a Division of The McGraw-Hill
Companies, 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, a Division of The McGraw-Hill Companies.

4.2      Consent of Kenny S&P Evaluation Services.

4.3      Consent of Carter, Ledyard & Milburn.

4.4      Consent of Arthur Anderson LLP

6.1      List of Directors and Officers of Depositor and other related 
         information (incorporated by reference to Form S-6 [File No.
         33-58059] filed on March 13, 1995 on behalf of Nuveen Tax-Exempt
         Unit Trust, Series 795).  

                                                                      
<PAGE>                                                                        
                                                                              
Exhibit 1.1(b)                                                                
                                                                              
                                                                              
                                                                              
                                                                              
                                 SCHEDULE A                                   
                                                                              
                                                                              
Series 817                                           August 10, 1995          
                                                                              
Item 1.  This Indenture relates to the Nuveen Tax-Exempt Unit Trust           
         Series 817.                                                          
                                                                              
Item 2.  The date of this Indenture is August 10, 1995.                       
                                                                              
Item 3.  Series 817 shall initially contain Trusts as follows:                
                                                                              
         (a)   California Insured Trust 252                                   
         (b)   Massachusetts Insured Trust 128                                
         (c)   New York Insured Trust 239                                     
                                                                              
                                                                              
Item 4.  Each Trust shall initially consist of the following number of Units: 
                                                                              
         (a)   California Insured Trust                 35,000 Units          
         (b)   Massachusetts Insured Trust              35,000 Units          
         (c)   New York 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)  California Insured Trust                $ .3187 per Unit       
         ( 2)  Massachusetts Insured Trust             $ .3177 per Unit       
         ( 3)  New York Insured Trust                  $ .3125 per Unit       
                                                                              
         (b) The date of the second distribution from the Interest Account    
             of the respective Trusts will be as follows:                     
                                                                              
         ( 1)  California Insured Trust                September 15, 1995     
         ( 2)  Massachusetts Insured Trust             September 15, 1995     
         ( 3)  New York Insured Trust                  September 15, 1995     
                                                                              
         (c) The record date for the second distribution from the             
             Interest Account of the respective Trusts will be as             
             follows:                                                         
                                                                              
         ( 1)  California Insured Trust                September 1, 1995      
         ( 2)  Massachusetts Insured Trust             September 1, 1995      
         ( 3)  New York Insured Trust                  September 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                 
             November 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)   California Insured Trust                September 1, 1995      
         (b)   Massachusetts Insured Trust             September 1, 1995      
         (c)   New York Insured Trust                  September 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)  California Insured Trust                $1.6513                
         ( 2)  Massachusetts Insured Trust             $1.6196                
         ( 3)  New York Insured Trust                  $1.625                 
                                                                              
         (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)  California Insured Trust                                       
                                                                              
               Monthly Plan of Distribution                  $1.6513          
               Quarterly Plan of Distribution                $1.3313          
               Semi-Annual Plan of Distribution              $1.1413          
                                                                              
         ( 2)  Massachusetts Insured Trust                                    
                                                                              
               Monthly Plan of Distribution                  $1.6196          
               Quarterly Plan of Distribution                $1.2996          
               Semi-Annual Plan of Distribution              $1.1096          
                                                                              
         ( 3)  New York Insured Trust                                         
                                                                              
               Monthly Plan of Distribution                  $1.625           
               Quarterly Plan of Distribution                $1.305           
               Semi-Annual Plan of Distribution              $1.115           
                                                                              
                                                                              
                                                                              
                            ADDITIONAL SCHEDULES                              
                                                                              
                                                                              
                         BONDS INITIALLY DEPOSITED                            
                                                                              
                  NUVEEN TAX-EXEMPT UNIT TRUST SERIES 817                     
                                                                              
                                                                              
                                                                              
                                                                              
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:  California Insured Trust 252                            
         Schedule C:  Massachusetts Insured Trust 128                         
         Schedule D:  New York Insured Trust 239                              


<PAGE>

EXHIBIT 3.1

(ON CHAPMAN AND CUTLER LETTERHEAD)

8/10/95


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

RE:  Nuveen Tax-Exempt Unit Trust, Series 817

Gentlemen:

    We have served as counsel for you, as depositor of Nuveen Tax-Exempt Unit
Trust, Series 817 (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. 33-60961) 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 4.4

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 ANDERSON LLP

Chicago, Illinois
8/10/95




<PAGE>

EXHIBIT 4.2

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

8/10/95

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

RE:  Nuveen Tax Exempt Unit Trust, Series 817

Gentlemen:

      We have examined Registration Statement File No. 33-60961 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>

EXHIBIT 4.1

(ON STANDARD & POOR'S, A DIVISION OF THE MCGRAW-HILL COMPANIES LETTERHEAD)

8/10/95

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

RE: Nuveen Tax-Exempt Unit Trust, Series 817

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 # 33-60961.

    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, a Division of The
McGraw-Hill Companies 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, a Division of The McGraw-Hill Companies 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, a Division
of The McGraw-Hill Companies 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, A DIVISION OF THE MCGRAW-HILL COMPANIES

 By Sanford Bragg


<PAGE>

EXHIBIT 3.2

(ON CHAPMAN AND CUTLER LETTERHEAD)

8/10/95

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

RE:  Nuveen Tax-Exempt Unit Trust, Series 817

Gentlemen:

    We have served as counsel for you, as Depositor of Nuveen Tax-Exempt Unit
Trust, Series 817 (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 817.

    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 MBIA Insurance 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. 33-60961) 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 ORRICK, HERRINGTON & SUTCLIFFE LETTERHEAD)




8/10/95


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

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

     Re: Nuveen Tax-Exempt Unit Trust, Series 817
            
            
         California Insured Trust 252  
            
                  

Dear Sirs:

        We have acted as special California counsel for John Nuveen & Co.
Incorporated, as Depositor of the above captioned trust(s) (each a "Trust"),
in connection with the issuance under the Trust Agreement dated 8/10/95,
among John Nuveen & Co. Incorporated, as Depositor, and United States Trust
Company of New York, as Trustee, of units of fractional undivided
interest in each Trust (the "Units") in exchange for certain bonds, as well as
"regular-way" and "when-issued" contracts for the purchase of bonds (such
bonds and contracts are hereinafter referred to collectively as the
Securities").

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

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

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

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

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

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

<PAGE> 

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


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

        We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement (File No. 33-60961) relating to the Units referred to
above and to the use of our name and to the reference to our firm in said
Registration Statement and in the related Prospectus.

Very truly yours,



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



<PAGE>

EXHIBIT 3.3

(ON EDWARDS & ANGELL LETTERHEAD)

8/10/95

Nuveen Tax-Exempt Unit Trust,
  Series 817
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 817
770 Broadway
New York, NY  10003

                 Re:   
                      Massachusetts Insured Trust 128

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 817 (the "Fund") concerning a Registration
Statement (No. 33-60961) 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 EDWARDS & ANGELL LETTERHEAD)

8/10/95

Nuveen Tax-Exempt Unit Trust,
Series 817
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 817
770 Broadway
New York, NY  10003

Re:  
    New York Insured Trust 239
     
     

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 817 (the "Fund") concerning a
Registration Statement (No. 33-60961) 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 4.3

(ON CARTER LEDYARD & MILBURN LETTERHEAD)

8/10/95


Nuveen Tax-Exempt Unit Trust, Series 817
c/o John Nuveen & Co. Incorporated,
as Depositor of Nuveen Tax-Exempt Unit
Trust, Series 817
333 W. Wacker Drive
Chicago, Illinois  60606

RE:  Nuveen Tax-Exempt Unit Trust, Series 817

Dear Sirs:

    We hereby consent to the reference to our firm under the caption "What is
the Tax Status of Unitholders?" in the Registration Statement and
related Prospectus of Nuveen Tax-Exempt Unit Trust, Series 817 for the
registration of units of fractional undivided interest in the Fund in the 
aggregate principal amount as set forth in the Closing Memorandum dated 
today's date.
 
Very truly yours,


CARTER, LEDYARD & MILBURN
 
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
California Insured  Trust 252  which  is incorporated  in the  Prospectus  dated
August  10,  1995  and  is  qualified  in  its  entirety  by  reference  to such
prospectus.
</LEGEND>
 
       
<S>                                                <C>
<PERIOD-TYPE>                                      OTHER
<FISCAL-YEAR-END>                                              July-30-1996
<PERIOD-END>                                                   July-30-1996
<INVESTMENTS-AT-COST>                                             3,268,580
<INVESTMENTS-AT-VALUE>                                            3,286,365
<RECEIVABLES>                                                        44,743
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    3,336,208
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            44,743
<TOTAL-LIABILITIES>                                                  44,743
<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>                                                      3,286,365
<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>                                                 93.90
<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 128  which is incorporated  in the Prospectus  dated
August  10,  1995  and  is  qualified  in  its  entirety  by  reference  to such
prospectus.
</LEGEND>
 
       
<S>                                                <C>
<PERIOD-TYPE>                                      OTHER
<FISCAL-YEAR-END>                                              July-30-1996
<PERIOD-END>                                                   July-30-1996
<INVESTMENTS-AT-COST>                                             3,345,061
<INVESTMENTS-AT-VALUE>                                            3,350,840
<RECEIVABLES>                                                        36,606
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    3,392,546
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            36,606
<TOTAL-LIABILITIES>                                                  36,606
<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>                                                      3,350,840
<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>                                                 95.74
<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 239 which is incorporated in the Prospectus dated August 10, 1995
and is qualified in its entirety by reference to such prospectus.
</LEGEND>
 
       
<S>                                                <C>
<PERIOD-TYPE>                                      OTHER
<FISCAL-YEAR-END>                                              July-30-1996
<PERIOD-END>                                                   July-30-1996
<INVESTMENTS-AT-COST>                                             3,321,264
<INVESTMENTS-AT-VALUE>                                            3,339,369
<RECEIVABLES>                                                        43,261
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    3,387,730
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            43,261
<TOTAL-LIABILITIES>                                                  43,261
<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>                                                      3,339,369
<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>                                                 95.41
<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>

                                   MEMORANDUM

                 Nuveen Tax-Exempt Unit Trust, Series 817
                               File No. 33-60961


    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 8/10/95,
and to set forth certain statistical data based thereon.  In addition, there 
are a number of other changes from the Prospectus as originally filed to which
reference is made, including the increase in the size of the Fund, a
corresponding increase in the number of Units and a change in the individual
trusts constituting the Fund.  All references to the Units, prices and related
statistical data will apply to each trust of the Fund and the Units thereof
individually.

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

                                    FORM S-6

    FACING SHEET.  The file number is now shown.

                                 THE PROSPECTUS

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

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

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

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

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

         Data regarding the composition of the portfolio of each
         Trust

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

         Concentrations of issues by purpose in each Trust

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

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

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

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

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

         The distribution table for each Trust

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

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

         The amount of the Trustee's Fee

                             THE INDENTURE

The Schedules to the Indenture have been completed.


CHAPMAN AND CUTLER


Chicago, Illinois

8/10/95


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