NUVEEN TAX FREE UNIT TRUST SERIES 917
487, 1997-02-05
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<PAGE>
   
                                                    FILE NO. 333-19723
                                                    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
 
   
<TABLE>
<S> <C>                 <C>
A.  Exact name of Trust: NUVEEN TAX-FREE UNIT TRUST, SERIES 917
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: Gifford R. Zimmerman
                        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 February 5, 1997 pursuant to paragraph (b)
/ / 60 days after filing pursuant to paragraph (a)
 
/ / on February 5, 1997 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: $0.
 
H.  Approximate date of proposed sale  to the public: As  soon as practicable after  the
    effective date of the Registration Statement.
 
/X/ Check  box if it is  proposed that this filing will  become effective on February 5,
    1997 at 1:30 P.M. pursuant to Rule 487.
</TABLE>
    
 
<PAGE>
   
                     NUVEEN TAX-FREE UNIT TRUST, SERIES 917
    
 
                             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)
 
<TABLE>
<C>  <S>  <C>                                          <C> <C>
FORM N-8B-2                                                FORM S-6
ITEM NUMBER                                                HEADING IN PROSPECTUS
 
          I. ORGANIZATION AND GENERAL INFORMATION
 1.  (a)  Name of trust                                 )  Prospectus Part A -- Cover Page
     (b)  Title of securities issued                    )
 2.  Name and address of Depositor                      )  Information About the Sponsor
 3.  Name and address of Trustee                        )  Information About the Trustee
 4.  Name and address of principal Underwriter          )  Information About the Sponsor
 5.  Organization of trust                              )  What Is The Nuveen Tax-Free Unit Trust?
 6.  Execution and termination of Trust Agreement       )  What Is The Nuveen Tax-Free Unit Trust?
                                                        )  Information About The Trustee
                                                        )  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 trust's securities   )  Summary of Portfolios
                                                        )  Why and How are the Bonds Insured?
                                                        )  When Are Distributions Made to Unitholders?
                                                        )  Ownership and Transfer of Units
                                                        )  How Units May Be Redeemed Without Charge?
                                                        )  How Bonds May Be Removed From The Trusts?
                                                        )  Information About the Trustee
                                                        )  Information About the Sponsor
                                                        )  Other Information
                                                        )  What Is The Tax Status of Unitholders?
11.  Type of securities comprising units                )  What Is The Nuveen Tax-Free Unit Trust?
                                                        )  Summary of Portfolios
                                                        )  Composition of Trusts
                                                        )  What Are The Objectives Of The Trusts?
                                                        )  Why and How are the Bonds Insured?
12.  Certain information regarding                      )  *
     periodic payment certificates                      )
13.  (a)  Load, fees, expenses, etc.                    )  Part A -- Essential Information
                                                        )  How Is The Public Offering Price Determined?
                                                        )  Market For Units
                                                        )  What Is Accrued Interest?
                                                        )  What Are Estimated Long Term Return
                                                        )  And Estimated Current Return?
                                                        )  How Was The Price Of The Bonds
                                                        )  Determined At The Date of Deposit?
                                                        )  What Are Normal Trust Operating Expenses?
                                                        )  When Are Distributions Made To Unitholders?
                                                        )  Summary Of Portfolios
                                                        )  How Detailed Are Reports To Unitholders?
</TABLE>
<PAGE>
<TABLE>
<C>  <S>  <C>                                          <C> <C>
     (b)  Certain information regarding                 )  *
          periodic payment certificates                 )
     (c)  Certain percentages                           )  How Is The Public Offering Price Determined?
                                                        )  Market For Units
                                                        )  What Are Estimated Long Term Return
                                                        )  And Estimated Current Return?
                                                        )  How Was The Price Of The Bonds
                                                        )  Determined At The Date Of Deposit?
                                                        )  What Is Accrued Interest?
     (d)  Certain other fees, etc. payable by holders   )  How Was The Price Of The Bonds Determined
                                                        )  At The Date Of Deposit?
                                                        )  What Are Normal Trust Operating Expenses?
                                                        )  Ownership And Transfer Of Units
     (e)  Certain profits receivable by depositor,      )  Composition Of Trusts
          principal underwriter, trustee or             )
          affiliated persons                            )
                                                        )  How Units May Be Purchased By The Sponsor
 
     (f)  Ratio of annual charges to income             )  *
14.  Issuance of trust's securities                     )  Summary of Portfolios
                                                        )  When Are Distributions Made To Unitholders?
                                                        )  Ownership and Transfer of Units
                                                        )  How Units May Be Redeemed Without Charge
15.  Receipt and handling of payments                   )  *
     from purchasers                                    )
16.  Acquisition and Disposition of                     )  What Is The Nuveen Tax-Free Unit Trust?
     Underlying Securities                              )
                                                        )  Summary of Portfolios
                                                        )  Composition of Trusts
                                                        )  Why and How are the Bonds Insured?
                                                        )  How Units May Be Redeemed Without Charge
                                                        )  How Bonds May Be Removed From The Trusts
                                                        )  Other Information
17.  Withdrawal or redemption                           )  Market For Units
                                                        )  How Units May Be Redeemed Without Charge
                                                        )  How Units May Be Purchased By The Sponsor
18.  (a)  Receipt and disposition of income             )  Summary of Portfolios
                                                        )  When Are Distributions Made To Unitholders?
                                                        )  How Detailed Are Reports To Unitholders?
     (b)  Reinvestment of distributions                 )  Accumulation Plan
     (c)  Reserves or special funds                     )  Summary of Portfolios
                                                        )  When Are Distributions Made To Unitholders?
     (d)  Schedule of distributions                     )  *
19.  Records, accounts and reports                      )  When Are Distributions Made To Unitholders?
                                                        )  How Detailed Are Reports To Unitholders?
20.  Certain miscellaneous provisions of                )  Information About the Trustee
     Trust Agreement                                    )
                                                        )  Information About the Sponsor
                                                        )  Other Information
21.  Loans to security holders                          )  *
22.  Limitations on liability                           )  Summary of Portfolios
                                                        )  Composition of Trusts
                                                        )  Information About The Trustee
23.  Bond arrangements                                  )  *
</TABLE>
<PAGE>
<TABLE>
<C>  <S>  <C>                                          <C> <C>
24.  Other material provisions of Trust Agreement.      )  *
 
          III. ORGANIZATION, PERSONNEL AND AFFILIATED PERSONS OF DEPOSITOR
25.  Organization of Depositor                          )  Information About the Sponsor
26.  Fees received by Depositor                         )  *
27.  Business of Depositor                              )  Information About the Sponsor
28.  Certain information as to officials                )  *
     and affiliated persons of Depositor                )
29.  Voting Securities of Depositor                     )  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                 )
 
          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                       )  How Units of The Trusts Are
                                                        )  Distributed To The Public
     (c)  Selling agreement                             )
39.  (a)  Organization of principal underwriter         )  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 underwriter       )  *
     (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                           )  Part A -- Essential Information
                                                        )  How Is The Public Offering Price Determined?
                                                        )  How Was The Price Of The Bonds
                                                        )  Determined At The Date of Deposit?
                                                        )  What Are Normal Trust Operating Expenses?
     (b)  Schedule as to offering price                 )  *
     (c)  Variation in offering price to                )  How Is the Public Offering Price
          certain persons                               )  Determined?
                                                        )  What Is Accrued Interest?
                                                        )  How Was The Price Of The Bonds
                                                        )  Determined At The Date of Deposit?
45.  Suspension of redemption rights                    )  *
</TABLE>
<PAGE>
<TABLE>
<C>  <S>  <C>                                          <C> <C>
46.  (a)  Redemption valuation                          )  Unit Value and Evaluation
                                                        )  How Units May Be Redeemed Without Charge
                                                        )  How Units May Be Purchased By The Sponsor
     (b)  Schedule as to redemption price               )  *
47.  Maintenance of position in underlying              )  How Is the Public Offering Price
     securities                                         )  Determined?
                                                        )  How Units May Be Purchased By The Sponsor
 
          V. INFORMATION CONCERNING THE TRUSTEE OR CUSTODIAN
48.  Organization and regulation of Trustee             )  Information About The Trustee
49.  Fees and expenses of Trustee                       )  Part A -- Essential Information
                                                        )  What Are Normal Trust Operating Expenses?
50.  Trustee's lien                                     )  What Are Normal Trust Operating Expenses?
                                                        )  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            )  What Are Normal Trust Operating
          respect to selection or elimination           )  Expenses?
          of underlying securities                      )
                                                        )  How Units May Be Redeemed Without Charge
                                                        )  How Bonds May Be Removed From The Trusts
     (b)  Transactions involving elimination            )  *
          of underlying securities                      )
     (c)  Policy regarding substitution or              )  Summary of Portfolios
          elimination of underlying securities          )
                                                        )  Composition of Trusts
                                                        )  How Bonds May Be Removed From The Trusts
     (d)  Fundamental policy not otherwise covered      )  *
53.  Tax status of trust                                )  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                      )  *
     periodic payment certificate                       )
57.                                                     )
58.                                                     )
</TABLE>
 
- ---------
 
* Inapplicable, omitted, answer negative or not required.
<PAGE>
   
                                FEBRUARY 5, 1997
                             SUBJECT TO COMPLETION
    
                                           A
   
NUVEEN                 NUVEEN NEW YORK INSURED TRUST 263
                    (NUVEEN TAX-FREE UNIT TRUSTS SERIES 917)
    
                                               CUSIP NUMBERS:
   
                                               Monthly:               67102K 408
                                               Quarterly:             67102K 416
                                               Semi-Annually:         67102K 424
    
   
            PROSPECTUS--PART A (SPECIFIC TERMS) -- FEBRUARY 5, 1997
 THIS PART A OF THE PROSPECTUS MAY NOT BE DISTRIBUTED UNLESS ACCOMPANIED BY THE
                                   PART B OF
THE NUVEEN TAX-FREE UNIT TRUSTS PROSPECTUS DATED FEBRUARY 1, 1997, TO WHICH SUCH
                                   REFERENCE
   HEREIN APPLIES. BOTH PARTS OF THE PROSPECTUS SHOULD BE RETAINED FOR FUTURE
                                   REFERENCE.
    
 
   
    New  York  Insured  Trust  263  (the "Trust")  consists  of  a  portfolio of
interest-bearing obligations issued by  or on behalf of  the State of New  York,
certain  United  States Territories  or  authorities and  political subdivisions
thereof which,  in  the  opinion  of recognized  bond  counsel  to  the  issuing
authorities, provide income which is exempt from Federal income tax and New York
state and city income taxes, to the extent indicated below.
    
    The  objectives of the Trust are income exempt from Federal and state income
taxes, and conservation  of capital.  The objectives are,  of course,  dependent
upon  the continuing  ability of the  issuers, obligors and/or  insurers to meet
their respective obligations.
   
    The Portfolio of  the Trust  consists of  8 obligations  issued by  entities
located  in New York. The  Bonds in the Trust  are either general obligations of
the governmental entity issuing them and are backed by the taxing power  thereof
or  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 the Bonds are divided as follows:
    
 
   
<TABLE>
<CAPTION>
     NUMBER OF                                              PORTFOLIO
      ISSUES                PURPOSE OF ISSUE                PERCENTAGE
  ---------------  ----------------------------------------------------
  <C>              <S>                                     <C>
         2         College and University Revenue                 29   %
         1         General Obligations                            14
         1         Health Care Facility Revenue                   14
         1         Industrial Revenue                             14
         1         Water and/or Sewer Revenue                     14
         1         Miscellaneous Revenue                          10
         1         Bridge and Toll Road Revenue                    4
</TABLE>
    
 
   
    Approximately  18.6% of the  aggregate principal amount of  the Bonds in the
Trust (accounting for approximately 16.4% of the aggregate offering price of the
Bonds) are original issue discount obligations. Certain of these original  issue
discount  obligations, amounting to  4.3% of the  aggregate principal amount and
1.7% of  the aggregate  offering price  of the  Bonds in  the Trust,  are  "zero
coupon"  bonds. See "RISK FACTORS" in Part B of this Prospectus for a discussion
of  the  characteristics  of  such  obligations  and  of  the  risks  associated
therewith.
    
    All  of the Bonds in the Trust are covered by policies of insurance obtained
from the  MBIA  Insurance  Corporation guaranteeing  payment  of  principal  and
interest  when due. As a  result of such insurance, the  Bonds in the Trust have
received a rating of "Aaa" by Moody's, "AAA" by Fitch, and/or "AAA" by  Standard
& Poor's.
   
    The  Trust  is  considered  to  be  concentrated  in  Bonds  of  College and
University Revenue Issuers whose revenues are subject to certain risks including
declines in  "college  age" individuals  and  the possible  inability  to  raise
tuition  and fees. For a discussion of  the risks associated with investments in
the bonds of various issuers, see "RISK FACTORS" in Part B of this Prospectus.
    
   
                             ESSENTIAL INFORMATION
                REGARDING THE NUVEEN NEW YORK INSURED TRUST 263
       ON THE BUSINESS DAY PRIOR TO THE DATE OF DEPOSIT, FEBRUARY 4, 1997
    
         Sponsor and Evaluator.......... John Nuveen & Co. Incorporated
         Trustee.............................. The Chase Manhattan Bank
                ------------------------------------------------
 
The income, expense and distribution data  set forth below have been  calculated
for   Unitholders  receiving  monthly,  quarterly  or  semi-annual  distribution
options.
 
   
<TABLE>
<S>                                                   <C>
Principal Amount of Bonds in Trust..................  $     3,500,000
Number of Units.....................................           35,000
Fractional Undivided Interest in Trust Per Unit.....         1/35,000
Public Offering Price--Less than 500 Units
    Aggregate Offering Price of Bonds in Trust......  $     3,401,368
    Divided by Number of Units......................  $         97.18
    Plus Sales Charge 4.9% (5.152% of the Aggregate
     Offering Price of the Bonds per Unit)..........  $          5.01
    Public Offering Price Per Unit(1)...............  $        102.19
Redemption Price Per Unit (exclusive of accrued
  interest).........................................  $         96.71
Sponsor's Initial Repurchase Price Per Unit
  (exclusive of accrued interest)...................  $         97.18
Excess of Public Offering Price Per Unit over
  Redemption Price Per Unit.........................  $          5.48
Excess of Public Offering Price Per Unit over
  Sponsor's Repurchase Price Per Unit...............  $          5.01
Average Maturity of Bonds in the Trust(2)...........       25.6 years
</TABLE>
    
 
- ----------
 
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.
 
Information   contained  herein  is  subject   to  completion  or  amendment.  A
registration statement  relating to  these securities  has been  filed with  the
Securities  and Exchange  Commission. These securities  may not be  sold nor may
offers to buy be accepted prior  to the time the registration statement  becomes
effective.  This  Prospectus  shall  not  constitute an  offer  to  sell  or the
solicitation of an offer to buy nor shall there be any sale of these  securities
in  any State in which such offer,  solicitation or sale would be unlawful prior
to registration or qualification under the securities laws of any State.
 
                                     1 of 7
<PAGE>
                         ESSENTIAL INFORMATION (CONT.)
 
   
<TABLE>
<CAPTION>
                                                  MONTHLY        QUARTERLY      SEMI-ANNUAL
                                                -----------     -----------     -----------
  <S>                                           <C>             <C>             <C>
  Calculation of Estimated Net Annual
    Interest Income Per Unit
      Annual Interest Income(3)............         $5.5036         $5.5036        $5.5036
      Less Estimated Annual Expense........          $.2462          $.2142         $.1952
                                                -----------     -----------     -----------
      Estimated Net Annual Interest
        Income(4)..........................         $5.2574         $5.2894        $5.3084
  Daily Rate of Accrual Per Unit...........         $.01460         $.01469        $.01474
  ESTIMATED CURRENT RETURN(5)..............            5.14%           5.18%          5.19 %
  ESTIMATED LONG TERM RETURN(5)............            5.16%           5.19%          5.21 %
  Trustee's Annual Fees(6).................         $1.5831         $1.2631        $1.0731
Date of Deposit...................................................................................February 5, 1997
Settlement Date..................................................................................February 10, 1997
Mandatory Termination Date....................................See "OTHER INFORMATION" in Part B of this Prospectus
Minimum Value of Each Trust...................................See "OTHER INFORMATION" in Part B of this Prospectus
Sponsor's Annual Evaluation Fee.........................................$0.17 per $1,000 principal amount of Bonds
Estimated Annual Organizational Expenses(7).......................................................$.03086 per Unit
- ----------
</TABLE>
    
 
The evaluation time for purpose  of sale, purchase or  redemption of Units is  4
p.m.  Eastern time or as of  any earlier closing time on  a day on which the New
York Stock Exchange is scheduled in advance to close at such earlier time.  (See
"HOW IS THE PUBLIC OFFERING PRICE DETERMINED?" in Part B of this Prospectus.)
 
   
(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 Trust and, accordingly, for Units purchased on the Date
    of Deposit, $.07 of accrued interest to the Settlement Date will be added to
    the Public Offering  Price. (See "WHAT  IS ACCRUED INTEREST?"  in Part B  of
    this Prospectus.)
    
 
(2) The  Average Maturity  of Bonds  in the Trust  is calculated  based upon the
    stated maturities of the Bonds in the  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
    Bonds in the  Trust may  increase or  decrease from  time to  time as  Bonds
    mature or are called or sold.
 
(3) Assumes  delivery of  all Bonds. (See  "COMPOSITION OF  TRUSTS" appearing in
    Part B of this  Prospectus.) Interest income does  not include accretion  of
    original  issue  discount on  "zero coupon"  Bonds, Stripped  Obligations or
    other original issue discount Bonds. (See  "RISK FACTORS" in Part B of  this
    Prospectus.)
 
(4) The  amount and  timing of interest  distributions from the  Trust under the
    various plans of distribution  are set forth below.  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. 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.
 
(5) Estimated Long  Term Return  for the  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  a compounding factor, 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 "WHAT  ARE ESTIMATED  LONG TERM  RETURN AND
    ESTIMATED CURRENT RETURN?" in Part B of this Prospectus.
 
(6) Each Trustee annual  fee is per  $1,000 principal amount  of the  underlying
    Bonds  in  the  Trust  for  that portion  of  the  Trust  that  represents a
    particular plan of distribution.
 
(7) The 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 the Trust  portfolio, initial evaluation fees,  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?" in Part B of this Prospectus and
    "Statement of  Condition." Historically,  the  sponsors of  unit  investment
    trusts have paid all the costs of establishing such trusts.
 
                                     2 of 7
<PAGE>
                             INTEREST DISTRIBUTION
 
    Details  of interest distributions  per Unit of the  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
                                                                  1997                               PER YEAR
<S>                                     <C>            <C>            <C>            <C>        <C>
- ------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        3/1            5/1            8/1           11/1
Distribution Date.....................       3/15           5/15           8/15          11/15
- ----------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .3796(1)                                              $  5.2574
                                                          --------$.4380 every month--------
Quarterly Distribution Plan...........  $   .3796(1)   $   .8814(2)   $  1.3221      $  1.3221    $  5.2894
Semi-Annual Distribution Plan.........  $   .3796(1)   $   .8844(3)                  $  2.6532    $  5.3084
- ----------------------------------------------------------------------------------------------------------------
</TABLE>
    
 
 * 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.
   Distribution  Dates under each distribution plan are the fifteenth day of the
   month  in  which  the  respective   Record  Date  occurred.  For   additional
   information  see "WHEN ARE  DISTRIBUTIONS MADE TO UNITHOLDERS?"  in Part B of
   this Prospectus.
 
(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.
    
 
                             NEW YORK RISK FACTORS
 
    The  financial condition  of the  State of New  York is  affected by various
national,  economic,   social  and   environmental  policies   and   conditions.
Additionally,  Constitutional and statutory limitations imposed on the State and
its local governments concerning taxes, bond indebtedness and other matters  may
constrain the revenue-generating capacity of the State and its local governments
and,  therefore,  the ability  of  the issuers  of  the Bonds  to  satisfy their
obligations. Historically, the State  has been one of  the wealthiest states  in
the  nation; however, for decades  the State economy has  grown more slowly than
that of the nation as a  whole, gradually eroding the State's relative  economic
affluence.
 
    The  economic vitality of the State  and its various regions and, therefore,
the ability of the  State and its  local governments to  satisfy the Bonds,  are
affected  by  numerous  factors.  The  economy  of  the  State  continues  to be
influenced by the financial health of the City of New York, which faces  greater
competition  as other major cities  develop financial and business capabilities.
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.
 
    The State is party to numerous  lawsuits in which an adverse final  decision
could materially affect the State's governmental operations and consequently its
ability  to pay debt service on its  obligations. On January 21, 1994, the State
entered into a  settlement with Delaware  with respect to  STATE OF DELAWARE  V.
STATE OF NEW YORK. The State made an immediate $35 million payment and agreed to
make  a $33 million  annual payment in each  of the next  five fiscal years. The
State has not settled with other parties to the litigation and will continue  to
incur litigation expenses as to those claims.
 
    All  outstanding general  obligation bonds  of the  State are  rated "A-" by
Standard and Poor's and "A" by Moody's.
 
    Further information concerning New  York risk factors  may be obtained  upon
written  or telephonic request to the Trustee as described in "OTHER INFORMATION
- -- Supplemental Information" appearing in Part B of this Prospectus.
 
                                   TAX STATUS
 
    For a discussion of the Federal tax status of income earned on Trust  Units,
see "WHAT IS THE TAX STATUS OF UNITHOLDERS?" in Part B of this Prospectus.
 
    In  the opinion of Edwards  & Angell, special counsel  for the Trust 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
 
                                     3 of 7
<PAGE>
    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 Trust and distributed to such Unitholder. Thus, interest on
    bonds received by Unitholders which is not subject to New York State tax  is
    also exempt from New York City personal income tax.
 
        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 Trust are
    sold, redeemed or paid at maturity  or when the Unitholder's Units are  sold
    or  redeemed;  such gain  will  equal the  proceeds  of sale,  redemption or
    payment less the tax basis of the  New York Obligation or Unit (adjusted  to
    reflect  (a) the amortization  of premium or  discount, if any,  on New York
    Obligations held by  the Trust,  (b) accrued original  issue discount,  with
    respect  to  each  New York  Obligation  which,  at the  time  the  New York
    Obligation was issued, had original issue  discount, and (c) the deposit  of
    New   York  Obligations  with  accrued  interest  in  the  Trust  after  the
    Unitholder's settlement date).
 
        Interest or gain from  the Trust derived  by a Unitholder  who is not  a
    resident  of New York  State (or New York  City) will not  be subject to New
    York State (or  New York  City) 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 the Trust.
 
                                     4 of 7
<PAGE>
   
                       NUVEEN NEW YORK INSURED TRUST 263
                    (NUVEEN TAX-FREE UNIT TRUST SERIES 917)
        SCHEDULE OF INVESTMENTS AT THE DATE OF DEPOSIT, FEBRUARY 5, 1997
    
 
   
<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
<C>          <C> <S>                                              <C>                <C>         <C>        <C>
- ---------------------------------------------------------------------------------------------------------------------------
$   500,000      Dormitory Authority of the State of New York,       2006 at 102        AAA         Aaa     $       486,185
                   City University System Consolidated Third
                   General Resolution Revenue Bonds, 1996 Series
                   1, 5.50% Due 7/1/24.
    500,000      Dormitory Authority of the State of New York,       2005 at 102        AAA         Aaa             500,000
                   St. Vincent's Hospital and Medical Center of
                   New York, FHA-Insured Mortgage Revenue Bonds,
                   Series 1995, 5.80% Due 8/1/25.
    500,000      Dormitory Authority of the State of New York,       2005 at 102        AAA         Aaa             511,490
                   State University Educational Facilities
                   Revenue Bonds, Series 1995A, 6.00% Due
                   5/15/16.
    500,000      New York State Energy Research and Development      2006 at 102        AAA         Aaa             488,750
                   Authority, Gas Facilities Revenue Bonds, 1996
                   Series (The Brooklyn Union Gas Company
                   Project), 5.50% Due 1/1/21.
    500,000      The City of New York (New York), General            2007 at 101        AAA         Aaa             516,535
                   Obligation Bonds, Fiscal 1997 Series H,
                   6.125% Due 8/1/25.
    350,000      The Trust for Cultural Resources of the City of     2007 at 102        AAA         Aaa             342,125
                   New York (New York), Revenue Refunding Bonds,
                   Series 1996A (The Museum Of Modern Art),
                   5.50% Due 1/1/21.
    500,000      New York City (New York), Municipal Water           2006 at 101        AAA         Aaa             500,000
                   Finance Authority, Water and Sewer System
                   Revenue Bonds, Fiscal 1996 Series B, 5.75%
                   Due 6/15/26. (Original issue discount bonds
                   delivered on or about May 16, 1996 at a price
                   of 93.892% of principal amount.)
    150,000      Triborough Bridge and Tunnel Authority (New      No Optional Call      AAA         Aaa              56,283
                   York), General Purpose Revenue Bonds, Series
                   1993B, 0.00% Due 1/1/15. (Original issue
                   discount bonds delivered on or about November
                   9, 1993 at a price of 31.751% of principal
                   amount.)
- -----------                                                                                                 ---------------
$ 3,500,000                                                                                                 $     3,401,368
- -----------                                                                                                 ---------------
- -----------                                                                                                 ---------------
</TABLE>
    
 
- ------------
 
    (1)  The Sponsor's contracts to purchase  Bonds were entered into during the
period from January 22,  1997 to February 4,  1997. Other information  regarding
the Bonds in the Trust on the Date of Deposit is as follows:
 
   
<TABLE>
<CAPTION>
                                                                        ANNUAL
                                                           PROFIT      INTEREST
                                              COST TO     (OR LOSS)    INCOME TO    BID PRICE
                   TRUST                      SPONSOR    TO SPONSOR      TRUST      OF BONDS
  ----------------------------------------  -----------  -----------  -----------  -----------
  <S>                                       <C>          <C>          <C>          <C>
  NEW YORK INSURED TRUST 263..............  $ 3,385,961  $   15,407   $  192,625   $ 3,384,868
</TABLE>
    
 
   
In  addition,  the difference  between the  Trustee's determination  of Offering
Price and Bid Price (as a percentage of principal amount) is .47%. 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. 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.
    
 
    (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 specified in the  instruments setting forth the terms
and provisions of  such Bonds.  See "COMPOSITION OF  TRUSTS", "WHAT  IS THE  TAX
STATUS OF UNITHOLDERS?" and "RISK FACTORS" in Part B of this Prospectus.
 
    (3)  All the  Bonds in the  Insured Trusts,  as insured by  the Insurer, are
rated AAA  by  Standard &  Poor's,  AAA by  Fitch  and/or Aaa  by  Moody's.  The
insurance obtained by the Trust guarantees the payment of interest and principal
on  the Bonds when due  but does not cover  certain market risks associated with
fixed income  securities  such  as accelerated  payments,  premiums  payable  on
mandatory  redemptions or interest rate  risks. (See "WHY AND  HOW ARE THE BONDS
INSURED?" in  Part B  of this  Prospectus and  "Description of  Ratings" in  the
Information Supplement.)
 
                                     5 of 7
<PAGE>
                             Statement of Condition
 
   
                       NUVEEN NEW YORK INSURED TRUST 263
    
 
   
                    (Nuveen Tax-Free Unit Trust, Series 917)
    
 
   
                             AS OF FEBRUARY 5, 1997
    
 
   
<TABLE>
<S>                                                 <C>
    TRUST PROPERTY
Sponsor's contracts to purchase Tax-Free Bonds,
  backed by an irrevocable letter of
  credit(1)(2)....................................  $    3,401,368
Accrued interest to February 5, 1997 on underlying
  Bonds(1)........................................          18,590
Organizational costs(3)...........................           5,400
                                                    --------------
            Total.................................  $    3,425,358
                                                    --------------
                                                    --------------
   LIABILITIES AND INTEREST OF UNITHOLDERS
LIABILITIES:
    Accrued interest to February 5, 1997 on
     underlying Bonds(4)..........................  $       18,590
    Accrued organizational costs(3)...............           5,400
                                                    --------------
            Total.................................  $       23,990
                                                    --------------
                                                    --------------
INTEREST OF UNITHOLDERS:
    Units of fractional undivided interest
     outstanding (35,000)
      Cost to investors(5)........................  $    3,576,606
        Less: Gross underwriting commission(6)....        (175,238)
                                                    --------------
    Net amount applicable to investors............  $    3,401,368
                                                    --------------
            Total.................................  $    3,425,358
                                                    --------------
                                                    --------------
</TABLE>
    
 
- ------------
 
(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 on the Date of Deposit. 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 "Schedule of Investments" herein,  and their aggregate cost to
    the Trust are the  same. Such offering prices  were determined by Kenny  S&P
    Evaluation  Services, a division of J.J. Kenny Co., Inc., as of the close of
    business on the business day prior to the Date of Deposit. (See "HOW WAS THE
    PRICE OF THE BONDS  DETERMINED AT THE  DATE OF DEPOSIT?" in  Part B of  this
    Prospectus.)  Insurance coverage providing for the timely payment, when due,
    of all principal of and interest on  the Bonds in an Insured Trust 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) The 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 Date of Deposit.
 
(4) Representing, as set forth in "WHAT IS ACCRUED INTEREST?" in Part B of  this
    Prospectus,  advancement by  the Trustee of  an amount equal  to the accrued
    Bond interest as of the Date of Deposit.
 
(5) Aggregate Public Offering Price (exclusive of accrued interest) computed  as
    set  forth under "HOW IS THE PUBLIC OFFERING PRICE DETERMINED?" in Part B of
    this Prospectus.
 
(6) The gross underwriting commission of 4.90% of the Public Offering Price  has
    been  calculated on the assumption that the  Units sold are not subject to a
    reduction of sales  charge for  quantity purchases.  In single  transactions
    involving  500 Units or more, the sales  charge is reduced. (See "HOW IS THE
    PUBLIC OFFERING PRICE DETERMINED?" in Part B of this Prospectus.)
 
                                     6 of 7
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
   
TO THE BOARD OF DIRECTORS OF JOHN  NUVEEN & CO. INCORPORATED AND UNITHOLDERS  OF
NEW YORK INSURED TRUST 263:
    
 
   
    We  have audited the accompanying statement of condition and the schedule of
investments at date of deposit  (included in Part A  of this Prospectus) of  New
York Insured Trust 263 (contained in Nuveen Tax-Free Unit Trust, Series 917), as
of  February 5, 1997.  These financial statements are  the responsibility of the
Sponsor. Our  responsibility  is  to  express  an  opinion  on  these  financial
statements based on our audit.
    
 
    We  conducted  our  audit  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   statement  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
audit provides a reasonable basis for our opinion.
 
   
    In  our opinion, the statement of  condition and the schedule of investments
at date of deposit referred to  above present fairly, in all material  respects,
the  financial position of New York Insured Trust 263 as of February 5, 1997, in
conformity with generally accepted accounting principles.
    
 
                                                             ARTHUR ANDERSEN LLP
 
   
Chicago, Illinois,
February 5, 1997.
    
 
                                     7 of 7
<PAGE>
   
                                FEBRUARY 5, 1997
                             SUBJECT TO COMPLETION
    
                                           A
   
NUVEEN                   NUVEEN OHIO INSURED TRUST 140
                    (NUVEEN TAX-FREE UNIT TRUSTS SERIES 917)
    
                                               CUSIP NUMBERS:
   
                                               Monthly:               67102G 373
                                               Quarterly:             67102G 381
                                               Semi-Annually:         67102G 399
    
   
            PROSPECTUS--PART A (SPECIFIC TERMS) -- FEBRUARY 5, 1997
 THIS PART A OF THE PROSPECTUS MAY NOT BE DISTRIBUTED UNLESS ACCOMPANIED BY THE
                                   PART B OF
THE NUVEEN TAX-FREE UNIT TRUSTS PROSPECTUS DATED FEBRUARY 1, 1997, TO WHICH SUCH
                                   REFERENCE
   HEREIN APPLIES. BOTH PARTS OF THE PROSPECTUS SHOULD BE RETAINED FOR FUTURE
                                   REFERENCE.
    
    Ohio   Insured  Trust  140   (the  "Trust")  consists   of  a  portfolio  of
interest-bearing obligations  issued by  or  on behalf  of  the State  of  Ohio,
certain  United  States Territories  or  authorities and  political subdivisions
thereof which,  in  the  opinion  of recognized  bond  counsel  to  the  issuing
authorities,  provide income  which is exempt  from Federal income  tax and Ohio
state and local income tax, to the extent indicated below.
    The objectives of the Trust are income exempt from Federal and state  income
taxes,  and conservation  of capital. The  objectives are,  of course, dependent
upon the continuing  ability of the  issuers, obligors and/or  insurers to  meet
their respective obligations.
    The  Portfolio of  the Trust  consists of  9 obligations  issued by entities
located in Ohio. The Bonds  in the Trust are  either general obligations of  the
governmental  entity issuing them and are backed  by the taxing power thereof or
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 the Bonds are divided as follows:
 
<TABLE>
<CAPTION>
     NUMBER OF                                              PORTFOLIO
      ISSUES                PURPOSE OF ISSUE                PERCENTAGE
  ---------------  ----------------------------------------------------
  <C>              <S>                                     <C>
         2         Health Care Facility Revenue                   29   %
         2         General Obligations                            28
         1         Bridge and Toll Road Revenue                   15
         1         Miscellaneous Revenue                          15
         2         Water and/or Sewer Revenue                     11
         1         Dedicated-Tax Supported Revenue                 3
</TABLE>
 
    Approximately 17.9% of the  aggregate principal amount of  the Bonds in  the
Trust (accounting for approximately 16.1% of the aggregate offering price of the
Bonds)  are original issue discount obligations. Certain of these original issue
discount obligations, amounting to  2.9% of the  aggregate principal amount  and
 .7% of the aggregate offering price of the Bonds in the Trust, are "zero coupon"
bonds.  See "RISK FACTORS" in Part B of  this Prospectus for a discussion of the
characteristics of such obligations and of the risks associated therewith.
    All of the Bonds in the Trust are covered by policies of insurance  obtained
from  the  MBIA  Insurance  Corporation guaranteeing  payment  of  principal and
interest when due. As a  result of such insurance, the  Bonds in the Trust  have
received  a rating of "Aaa" by Moody's, "AAA" by Fitch, and/or "AAA" by Standard
& Poor's.
   
    The Trust is considered to be concentrated in Bonds of Health Care  Facility
Revenue  Issuers whose revenues are subject to certain risks including increased
governmental regulation, fluctuating occupancy levels and increased competition.
For a  discussion of  the risks  associated  with investments  in the  bonds  of
various issuers, see "RISK FACTORS" in Part B of this Prospectus.
    
   
                             ESSENTIAL INFORMATION
                  REGARDING THE NUVEEN OHIO INSURED TRUST 140
       ON THE BUSINESS DAY PRIOR TO THE DATE OF DEPOSIT, FEBRUARY 4, 1997
    
         Sponsor and Evaluator.......... John Nuveen & Co. Incorporated
         Trustee.............................. The Chase Manhattan Bank
                ------------------------------------------------
 
The  income, expense and distribution data  set forth below have been calculated
for  Unitholders  receiving  monthly,  quarterly  or  semi-annual   distribution
options.
 
   
<TABLE>
<S>                                                   <C>
Principal Amount of Bonds in Trust..................  $     3,500,000
Number of Units.....................................           35,000
Fractional Undivided Interest in Trust Per Unit.....         1/35,000
Public Offering Price--Less than 500 Units
    Aggregate Offering Price of Bonds in Trust......  $     3,354,914
    Divided by Number of Units......................  $         95.85
    Plus Sales Charge 4.9% (5.152% of the Aggregate
     Offering Price of the Bonds per Unit)..........  $          4.94
    Public Offering Price Per Unit(1)...............  $        100.79
Redemption Price Per Unit (exclusive of accrued
  interest).........................................  $         95.40
Sponsor's Initial Repurchase Price Per Unit
  (exclusive of accrued interest)...................  $         95.85
Excess of Public Offering Price Per Unit over
  Redemption Price Per Unit.........................  $          5.39
Excess of Public Offering Price Per Unit over
  Sponsor's Repurchase Price Per Unit...............  $          4.94
Average Maturity of Bonds in the Trust(2)...........       24.8 years
</TABLE>
    
 
- ----------
 
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.
 
Information  contained  herein  is  subject   to  completion  or  amendment.   A
registration  statement relating  to these  securities has  been filed  with the
Securities and Exchange  Commission. These securities  may not be  sold nor  may
offers  to buy be accepted prior to  the time the registration statement becomes
effective. This  Prospectus  shall  not  constitute an  offer  to  sell  or  the
solicitation  of an offer to buy nor shall there be any sale of these securities
in any State in which such offer,  solicitation or sale would be unlawful  prior
to registration or qualification under the securities laws of any State.
 
                                     1 of 7
<PAGE>
                         ESSENTIAL INFORMATION (CONT.)
 
   
<TABLE>
<CAPTION>
                                                  MONTHLY        QUARTERLY      SEMI-ANNUAL
                                                -----------     -----------     -----------
  <S>                                           <C>             <C>             <C>
  Calculation of Estimated Net Annual
    Interest Income Per Unit
      Annual Interest Income(3)............         $5.3311         $5.3311        $5.3311
      Less Estimated Annual Expense........          $.2377          $.2057         $.1867
                                                -----------     -----------     -----------
      Estimated Net Annual Interest
        Income(4)..........................         $5.0934         $5.1254        $5.1444
  Daily Rate of Accrual Per Unit...........         $.01414         $.01423        $.01429
  ESTIMATED CURRENT RETURN(5)..............            5.05%           5.09%          5.10 %
  ESTIMATED LONG TERM RETURN(5)............            5.10%           5.13%          5.15 %
  Trustee's Annual Fees(6).................         $1.5152         $1.1952        $1.0052
Date of Deposit...................................................................................February 5, 1997
Settlement Date..................................................................................February 10, 1997
Mandatory Termination Date....................................See "OTHER INFORMATION" in Part B of this Prospectus
Minimum Value of Each Trust...................................See "OTHER INFORMATION" in Part B of this Prospectus
Sponsor's Annual Evaluation Fee.........................................$0.17 per $1,000 principal amount of Bonds
Estimated Annual Organizational Expenses(7).......................................................$.02914 per Unit
- ----------
</TABLE>
    
 
The  evaluation time for purpose  of sale, purchase or  redemption of Units is 4
p.m. Eastern time or as of  any earlier closing time on  a day on which the  New
York  Stock Exchange is scheduled in advance to close at such earlier time. (See
"HOW IS THE PUBLIC OFFERING PRICE DETERMINED?" in Part B of this Prospectus.)
 
   
(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 Trust and, accordingly, for Units purchased on the  Date
    of Deposit, $.07 of accrued interest to the Settlement Date will be added to
    the  Public Offering Price.  (See "WHAT IS  ACCRUED INTEREST?" in  Part B of
    this Prospectus.)
    
 
(2) The Average Maturity  of Bonds  in the Trust  is calculated  based upon  the
    stated  maturities of the Bonds in the  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
    Bonds  in the  Trust may  increase or  decrease from  time to  time as Bonds
    mature or are called or sold.
 
(3) Assumes delivery of  all Bonds.  (See "COMPOSITION OF  TRUSTS" appearing  in
    Part  B of this  Prospectus.) Interest income does  not include accretion of
    original issue  discount on  "zero coupon"  Bonds, Stripped  Obligations  or
    other  original issue discount Bonds. (See "RISK  FACTORS" in Part B of this
    Prospectus.)
 
(4) The amount and  timing of interest  distributions from the  Trust under  the
    various  plans of distribution  are set forth below.  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. 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.
 
(5) Estimated  Long  Term Return  for the  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 a compounding factor, 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 "WHAT  ARE ESTIMATED  LONG TERM  RETURN  AND
    ESTIMATED CURRENT RETURN?" in Part B of this Prospectus.
 
(6) Each  Trustee annual  fee is per  $1,000 principal amount  of the underlying
    Bonds in  the  Trust  for  that  portion of  the  Trust  that  represents  a
    particular plan of distribution.
 
(7) The  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 the Trust  portfolio, initial evaluation fees,  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?" in Part B of this Prospectus and
    "Statement  of  Condition." Historically,  the  sponsors of  unit investment
    trusts have paid all the costs of establishing such trusts.
 
                                     2 of 7
<PAGE>
                             INTEREST DISTRIBUTION
 
    Details of interest distributions  per Unit of the  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
                                                                  1997                               PER YEAR
<S>                                     <C>            <C>            <C>            <C>        <C>
- ------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        3/1            5/1            8/1           11/1
Distribution Date.....................       3/15           5/15           8/15          11/15
- ----------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .3676(1)                                              $  5.0934
                                                        --------  $.4242 every month  --------
Quarterly Distribution Plan...........  $   .3676(1)   $   .8538(2)   $  1.2807      $  1.2807    $  5.1254
Semi-Annual Distribution Plan.........  $   .3676(1)   $   .8574(3)                  $  2.5722    $  5.1444
- ----------------------------------------------------------------------------------------------------------------
</TABLE>
    
 
 * 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.
   Distribution Dates under each distribution plan are the fifteenth day of  the
   month   in  which  the  respective   Record  Date  occurred.  For  additional
   information see "WHEN ARE  DISTRIBUTIONS MADE TO UNITHOLDERS?"  in Part B  of
   this Prospectus.
 
(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.
    
 
                               OHIO RISK FACTORS
 
    The financial  condition  of  the  State of  Ohio  is  affected  by  various
national,   economic,   social  and   environmental  policies   and  conditions.
Additionally, Constitutional and statutory limitations imposed on the State  and
its  local governments concerning taxes, bond indebtedness and other matters may
constrain the revenue-generating capacity of the State and its local governments
and, therefore,  the  ability of  the  issuers of  the  Bonds to  satisfy  their
obligations.  The  State operates  on the  basis  of a  fiscal biennium  for its
appropriations and expenditures, and is precluded by law from ending its  fiscal
year or fiscal biennium in a deficit position.
 
    The  economic vitality of the State  and its various regions and, therefore,
the ability of the  State and its  local governments to  satisfy the Bonds,  are
affected by numerous factors. While diversifying more into the service and other
non-manufacturing  areas, the Ohio economy continues  to rely in part on durable
goods manufacturing,  largely  concentrated  in motor  vehicles  and  equipment,
steel,  rubber products and household appliances.  As a result, general economic
activity, as  in many  other  industrially-developed states,  tends to  be  more
cyclical  than in some other states and in the nation as a whole. Agriculture is
an important segment of the economy, with over half the State's area devoted  to
farming and approximately 15% of total employment in agribusiness.
 
    The State is a party to numerous lawsuits in which an adverse final decision
could  materially affect the State  governmental operations and consequently its
ability to pay debt service on its obligations.
 
    Further information  concerning  State risk  factors  may be  obtained  upon
written  or telephonic request to the Trustee as described in "OTHER INFORMATION
- -- Supplemental Information" appearing in Part B of this Prospectus.
 
                                   TAX STATUS
 
    For a discussion of the Federal tax status of income earned on Trust  Units,
see "WHAT IS THE TAX STATUS OF UNITHOLDERS?" in Part B of this Prospectus.
 
    The  Trust is comprised primarily  of interest-bearing obligations issued by
or on behalf of the State  of Ohio, political subdivisions thereof, or  agencies
or  instrumentalities thereof (the "Ohio Obligations"), or by the governments of
Puerto  Rico,  the  Virgin  Islands,  the  Northern  Mariana  Islands  or   Guam
(collectively, "Obligations").
 
    In  the opinion of  Squire, Sanders &  Dempsey, special Ohio  counsel to the
Trust, provided that at  all times at  least fifty percent of  the value of  the
total assets of the Trust consist of Ohio Obligations, or similar obligations of
other states or their subdivisions, under existing Ohio law:
 
        The  Trust is not taxable as a  corporation or otherwise for purposes of
    the Ohio personal income  tax, Ohio school district  income taxes, the  Ohio
    corporation franchise tax, or the Ohio dealers in intangibles tax.
 
                                     3 of 7
<PAGE>
        Income of the Trust will be treated as the income of the Unitholders for
    purposes  of the Ohio personal income  tax and municipal and school district
    income taxes in Ohio and the Ohio corporation franchise tax in proportion to
    the respective interest therein of each Unitholder.
 
        Interest on  Obligations held  by  the Trust  is  exempt from  the  Ohio
    personal income tax, and municipal and school district income taxes in Ohio,
    and  is excluded from the net income  base of the Ohio corporation franchise
    tax when distributed or deemed distributed to Unitholders.
 
        Proceeds paid under insurance  policies, if any, to  the Trustee of  the
    Trust  representing maturing interest  on defaulted obligations  held by the
    Trust that is  excluded from gross  income for federal  income tax  purposes
    will  be exempt from the  Ohio personal income tax  and municipal and school
    district income  taxes  in  Ohio  and  the  net  income  base  of  the  Ohio
    corporation franchise tax.
 
        Gains  and losses realized on the sale, exchange or other disposition by
    the Trust of Ohio Obligations are excluded in determining adjusted gross and
    taxable income for purposes of the  Ohio personal income tax, and  municipal
    and  school district  income taxes  in Ohio, and  are excluded  from the net
    income base of the Ohio corporation franchise tax when distributed or deemed
    distributed to Unitholders.
 
                                     4 of 7
<PAGE>
   
                         NUVEEN OHIO INSURED TRUST 140
                    (NUVEEN TAX-FREE UNIT TRUST SERIES 917)
        SCHEDULE OF INVESTMENTS AT THE DATE OF DEPOSIT, FEBRUARY 5, 1997
    
 
   
<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
<C>          <C> <S>                                              <C>                <C>         <C>        <C>
- ---------------------------------------------------------------------------------------------------------------------------
$   525,000      State of Ohio, Turnpike Revenue Bonds, 1996         2006 at 102        AAA         Aaa     $       513,812
                   Series A, Issued by the Ohio Turnpike
                   Commission, 5.50% Due 2/15/26. (Original
                   issue discount bonds delivered on or about
                   June 20, 1996 at a price of 93.50% of
                   principal amount.)
    270,000      Ohio Water Development Authority, State of          2005 at 101        AAA         Aaa             272,063
                   Ohio, Water Pollution Control Loan Fund
                   Revenue Bonds, State Match Series 1995, 5.75%
                   Due 12/1/17.
    110,000      Cleveland-Cuyahoga County Port Authority            2006 at 102        AAA         Aaa             108,078
                   (Ohio), Senior Refunding Revenue Bonds,
                   Series 1997 (Rock and Roll Hall of Fame and
                   Museum Project), 5.40% Due 12/1/15.
    525,000      City of Cleveland, Ohio, Parking Facilities         2006 at 102        AAA         Aaa             514,369
                   Refunding Revenue Bonds, Series 1996, 5.50%
                   Due 9/15/22.
    500,000      Greater Cleveland Regional Transit Authority        2006 at 101        AAA         Aaa             502,095
                   (Ohio), General Obligation Capital
                   Improvement Bonds, Series 1996, 5.65% Due
                   12/1/16.
    500,000      County of Cuyahoga, Ohio, Hospital Improvement      2006 at 102        AAA         Aaa             494,690
                   and Refunding Revenue Bonds, Series 1996A
                   (University Hospitals Health System, Inc.
                   Project), 5.625% Due 1/15/26.
    100,000      City of Huber Heights, Ohio, Water System        No Optional Call      AAA         Aaa              24,781
                   Revenue Bonds, Series 1995, 0.00% Due
                   12/1/21. (Original issue discount bonds
                   delivered on or about September 29, 1995 at a
                   price of 20.229% of principal amount.)
    500,000      County of Mahoning, Ohio, Hospital Improvement      2005 at 102        AAA         Aaa             485,905
                   Revenue Bonds, Series 1995 (Western Reserve
                   Care System Project), 5.50% Due 10/15/25.
    470,000      City of North Olmsted, Ohio, General                2007 at 101        AAA         Aaa             439,121
                   Obligation, Various Purpose Bonds, Series
                   1996, 5.00% Due 12/1/16.
- -----------                                                                                                 ---------------
$ 3,500,000                                                                                                 $     3,354,914
- -----------                                                                                                 ---------------
- -----------                                                                                                 ---------------
</TABLE>
    
 
- ------------
 
    (1) The Sponsor's contracts to purchase Bonds were entered into on  February
4,  1997. Other  information regarding  the Bonds  in the  Trust on  the Date of
Deposit is as follows:
 
   
<TABLE>
<CAPTION>
                                                                        ANNUAL
                                                           PROFIT      INTEREST
                                              COST TO     (OR LOSS)    INCOME TO    BID PRICE
                   TRUST                      SPONSOR    TO SPONSOR      TRUST      OF BONDS
  ----------------------------------------  -----------  -----------  -----------  -----------
  <S>                                       <C>          <C>          <C>          <C>
  OHIO INSURED TRUST 140..................  $ 3,336,548  $   18,366   $  186,590   $ 3,339,014
</TABLE>
    
 
   
In addition,  the difference  between the  Trustee's determination  of  Offering
Price  and Bid Price (as a percentage of principal amount) is .45%. 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.  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.
    
 
    (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 specified in  the instruments setting forth the  terms
and  provisions of  such Bonds.  See "COMPOSITION OF  TRUSTS", "WHAT  IS THE TAX
STATUS OF UNITHOLDERS?" and "RISK FACTORS" in Part B of this Prospectus.
 
    (3) All the  Bonds in the  Insured Trusts,  as insured by  the Insurer,  are
rated  AAA  by  Standard &  Poor's,  AAA by  Fitch  and/or Aaa  by  Moody's. The
insurance obtained by the Trust guarantees the payment of interest and principal
on the Bonds when due  but does not cover  certain market risks associated  with
fixed  income  securities  such  as accelerated  payments,  premiums  payable on
mandatory redemptions or interest  rate risks. (See "WHY  AND HOW ARE THE  BONDS
INSURED?"  in Part  B of  this Prospectus  and "Description  of Ratings"  in the
Information Supplement.)
 
                                     5 of 7
<PAGE>
                             Statement of Condition
 
   
                         NUVEEN OHIO INSURED TRUST 140
    
 
   
                    (Nuveen Tax-Free Unit Trust, Series 917)
    
 
   
                             AS OF FEBRUARY 5, 1997
    
 
   
<TABLE>
<S>                                                 <C>
    TRUST PROPERTY
Sponsor's contracts to purchase Tax-Free Bonds,
  backed by an irrevocable letter of
  credit(1)(2)....................................  $    3,354,914
Accrued interest to February 5, 1997 on underlying
  Bonds(1)........................................          49,287
Organizational costs(3)...........................           5,100
                                                    --------------
            Total.................................  $    3,409,301
                                                    --------------
                                                    --------------
   LIABILITIES AND INTEREST OF UNITHOLDERS
LIABILITIES:
    Accrued interest to February 5, 1997 on
     underlying Bonds(4)..........................  $       49,287
    Accrued organizational costs(3)...............           5,100
                                                    --------------
            Total.................................  $       54,387
                                                    --------------
                                                    --------------
INTEREST OF UNITHOLDERS:
    Units of fractional undivided interest
     outstanding (35,000)
      Cost to investors(5)........................  $    3,527,759
        Less: Gross underwriting commission(6)....        (172,845)
                                                    --------------
    Net amount applicable to investors............  $    3,354,914
                                                    --------------
            Total.................................  $    3,409,301
                                                    --------------
                                                    --------------
</TABLE>
    
 
- ------------
 
(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 on the Date of Deposit. 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 "Schedule of Investments"  herein, and their aggregate cost  to
    the  Trust are the same.  Such offering prices were  determined by Kenny S&P
    Evaluation Services, a division of J.J. Kenny Co., Inc., as of the close  of
    business on the business day prior to the Date of Deposit. (See "HOW WAS THE
    PRICE  OF THE BONDS  DETERMINED AT THE DATE  OF DEPOSIT?" in  Part B of this
    Prospectus.) Insurance coverage providing for the timely payment, when  due,
    of  all principal of and interest on the  Bonds in an Insured Trust 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) The  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 Date of Deposit.
 
(4) Representing,  as set forth in "WHAT IS ACCRUED INTEREST?" in Part B of this
    Prospectus, advancement by  the Trustee of  an amount equal  to the  accrued
    Bond interest as of the Date of Deposit.
 
(5) Aggregate  Public Offering Price (exclusive of accrued interest) computed as
    set forth under "HOW IS THE PUBLIC OFFERING PRICE DETERMINED?" in Part B  of
    this Prospectus.
 
(6) The  gross underwriting commission of 4.90% of the Public Offering Price has
    been calculated on the assumption that the  Units sold are not subject to  a
    reduction  of sales  charge for  quantity purchases.  In single transactions
    involving 500 Units or more, the sales  charge is reduced. (See "HOW IS  THE
    PUBLIC OFFERING PRICE DETERMINED?" in Part B of this Prospectus.)
 
                                     6 of 7
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
   
TO  THE BOARD OF DIRECTORS OF JOHN  NUVEEN & CO. INCORPORATED AND UNITHOLDERS OF
OHIO INSURED TRUST 140:
    
 
   
    We have audited the accompanying statement of condition and the schedule  of
investments  at date of deposit (included in  Part A of this Prospectus) of Ohio
Insured Trust 140 (contained in Nuveen  Tax-Free Unit Trust, Series 917), as  of
February  5,  1997. These  financial statements  are  the responsibility  of the
Sponsor. Our  responsibility  is  to  express  an  opinion  on  these  financial
statements based on our audit.
    
 
    We  conducted  our  audit  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   statement  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
audit provides a reasonable basis for our opinion.
 
   
    In  our opinion, the statement of  condition and the schedule of investments
at date of deposit referred to  above present fairly, in all material  respects,
the  financial position  of Ohio Insured  Trust 140  as of February  5, 1997, in
conformity with generally accepted accounting principles.
    
 
                                                             ARTHUR ANDERSEN LLP
 
   
Chicago, Illinois,
February 5, 1997.
    
 
                                     7 of 7
<PAGE>


<PAGE>
 
                                           B
 
NUVEEN  Tax-Exempt Unit Trusts
             PROSPECTUS -- PART B
            (GENERAL TERMS)
              SEPTEMBER 1, 1995
 
THIS PART B OF THE PROSPECTUS MAY NOT BE DISTRIBUTED UNLESS ACCOMPANIED BY  PART
A. BOTH PARTS OF THIS PROSPECTUS SHOULD BE RETAINED FOR FUTURE REFERENCE.
FURTHER  DETAIL REGARDING CERTAIN OF THE  INFORMATION PROVIDED IN THE PROSPECTUS
MAY BE OBTAINED WITHIN  FIVE BUSINESS DAYS OF  WRITTEN OR TELEPHONIC REQUEST  TO
THE TRUSTEE AT 770 BROADWAY, NEW YORK, NY 10003 OR (800) 257-8787.
 
INTEREST  INCOME TO A TRUST 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.
 
THIS  NUVEEN TAX-EXEMPT  UNIT TRUST SERIES  consists of  the underlying separate
unit investment  trust  set forth  in  Part A  to  this Prospectus.  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  "Schedule of  Investments"
appearing  in Part A of this Prospectus).  Except in specific instances as noted
in Part A of  this Prospectus, the  information contained in  this Part B  shall
apply  to each Trust in its entirety.  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 "WHY AND HOW ARE THE  BONDS
INSURED?".)
 
THE  OBJECTIVES of  a Trust  are tax-exempt  income and  conservation of capital
through a diversified investment  in tax-exempt Bonds.  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 a Trust's objectives will be
achieved. (See "RISK FACTORS".)
 
DISTRIBUTIONS of interest received by a Trust will be made semi-annually  unless
the  Unitholder  elects to  receive them  monthly or  quarterly. (See  "WHEN ARE
DISTRIBUTIONS MADE TO  UNITHOLDERS?".) 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 Part A of this
Prospectus and  "WHAT  ARE ESTIMATED  LONG  TERM RETURN  AND  ESTIMATED  CURRENT
RETURN?".)
 
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 "HOW IS THE PUBLIC
OFFERING  PRICE DETERMINED?".)  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 "HOW IS THE PUBLIC OFFERING PRICE DETERMINED?".)
 
A  UNITHOLDER MAY REDEEM UNITS at the office of the Trustee 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 "HOW  UNITS MAY BE REDEEMED  WITHOUT
CHARGE?".)  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 "MARKET  FOR UNITS".) RETAIN  BOTH
PART A AND PART B OF THIS PROSPECTUS FOR FUTURE REFERENCE.
 
<PAGE>
RISK FACTORS. An investment in a Trust  should be made with an understanding  of
the risks associated therewith, including, among other factors, the inability of
the issuer or an insurer to pay the principal of or interest on a bond when due,
volatile interest rates, early call provisions, and changes to the tax status of
the Bonds. See Part A of this Prospectus and "RISK FACTORS."
 
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                                                             PAGE
<C>   <S>                                              <C>        <C>
      WHAT IS THE NUVEEN TAX-EXEMPT UNIT TRUST?                            3
      WHAT ARE THE OBJECTIVES OF THE TRUSTS?                               3
      SUMMARY OF PORTFOLIOS                                                3
      RISK FACTORS                                                         4
      COMPOSITION OF TRUSTS                                                6
      WHY AND HOW ARE THE BONDS INSURED?                                   7
      HOW IS THE PUBLIC OFFERING PRICE DETERMINED?                         8
      MARKET FOR UNITS                                                    11
      WHAT IS ACCRUED INTEREST?                                           11
      WHAT ARE ESTIMATED LONG TERM RETURN AND ESTIMATED
      CURRENT RETURN?                                                     12
      HOW WAS THE PRICE OF THE BONDS DETERMINED AT THE
      DATE
      OF DEPOSIT?                                                         12
      WHAT IS THE TAX STATUS OF UNITHOLDERS?                              13
      WHAT ARE NORMAL TRUST OPERATING EXPENSES?                           14
      WHEN ARE DISTRIBUTIONS MADE TO UNITHOLDERS?                         15
      ACCUMULATION PLAN                                                   16
      HOW DETAILED ARE REPORTS TO UNITHOLDERS?                            17
      UNIT VALUE AND EVALUATION                                           17
      HOW UNITS OF THE TRUSTS ARE DISTRIBUTED TO THE
      PUBLIC                                                              17
      OWNERSHIP AND TRANSFER OF UNITS                                     19
      HOW UNITS MAY BE REDEEMED WITHOUT CHARGE                            19
      HOW UNITS MAY BE PURCHASED BY THE SPONSOR                           20
      HOW BONDS MAY BE REMOVED FROM THE TRUSTS                            20
      INFORMATION ABOUT THE TRUSTEE                                       21
      INFORMATION ABOUT THE SPONSOR                                       22
      OTHER INFORMATION                                                   22
</TABLE>
 
                  2
<PAGE>
WHAT IS THE NUVEEN TAX-EXEMPT UNIT TRUST?
 
This 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. The underlying unit investment trusts contained in this
Series  are  combined  under  one   Trust  Indenture  and  Agreement.   Specific
information  regarding this Trust is set forth in Part A of this Prospectus. The
various Nuveen Tax-Exempt Unit Trusts are collectively referred to herein as the
"Trusts"; the trusts in which few or none of the Bonds are insured are sometimes
referred to as the "Traditional  Trusts", the trusts in  which all of the  Bonds
are  insured  as described  herein  are sometimes  referred  to as  the "Insured
Trusts", and  the state  trusts  (both Traditional  and Insured)  are  sometimes
referred to as the "State Trusts." This Series was created under the laws of the
State  of New York pursuant to a Trust Indenture and Agreement dated the Date of
Deposit (the "Indenture") between John Nuveen & Co. Incorporated (the "Sponsor")
and The Chase Manhattan Bank, N.A. (the "Trustee").
 
    The Sponsor has deposited with  the Trustee delivery statements relating  to
contracts  for the  purchase of municipal  debt obligations  together with funds
represented by an irrevocable letter of credit issued by a major commercial bank
in the amount, including accrued interest,  required for their purchase (or  the
obligations  themselves) (the "Bonds"). See "Schedule  of Investments" in Part A
of this Prospectus, for  a description of the  Securities deposited in a  Trust.
See  "SUMMARY OF PORTFOLIOS" and "RISK FACTORS"  for a discussion of zero coupon
bonds and  stripped obligations  included in  the Trusts,  if any.  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 "Schedule of  Investments" in Part  A of this
Prospectus and  "COMPOSITION  OF TRUSTS".  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 "COMPOSITION OF TRUSTS."
 
    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 "WHY AND HOW  ARE THE BONDS INSURED?".) 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 which  represent
ownership  of  the  entire  Trust,  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 set forth in "Essential
Information" in Part A of this Prospectus.  Units may only be sold in states  in
which  they  are registered.  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.
 
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  and  certain  state  income  tax and
intangibles taxes, if any, for purchasers who qualify as residents of that State
in which Bonds are issued. 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 "WHY  AND
HOW  ARE THE  BONDS INSURED?".)  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  in  certain  Traditional  Trusts  may  be  covered  by  insurance
guaranteeing  the timely payment, when due, of all principal and interest. 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  the Appendices to  the
Information Supplement of this Prospectus.
 
SUMMARY OF PORTFOLIOS
 
In  selecting  Bonds for  the respective  Trusts,  the following  factors, among
others, were considered:  (i) the Standard  & Poor's Corporation  rating of  the
Bonds  or the Moody's Investors Service, Inc. rating of the Bonds (see "WHAT ARE
THE OBJECTIVES OF THE TRUSTS?" 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. (See "WHY AND HOW ARE THE BONDS INSURED?".)
 
                                       3
<PAGE>
RISK FACTORS
 
    An  investment in Units of any Trust should be made with an understanding of
the risks that such an investment may entail. Each Trust consists of  fixed-rate
municipal  debt  obligations. As  such, 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. The Sponsor cannot  predict
the  extent or timing  of such fluctuations and,  accordingly, their effect upon
the value of the debt obligations.  Additional risk factors include the  ability
of  the issuer, or, if applicable, an  insurer, to make payments of interest and
principal when  due, "mandatory  put" features,  early call  provisions and  the
potential  for changes in the tax status of the Bonds. As set forth in Part A of
this Prospectus, the Trusts may contain or be concentrated in one or more of the
types of bonds discussed below. The following paragraphs briefly 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,  and
which  also  therefore 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. The Bonds
described  below  may  be  subject   to  special  or  extraordinary   redemption
provisions.  For economic risks specific to the individual Trusts, see Part A of
this Prospectus  and  the  Appendices  to the  Information  Supplement  of  this
Prospectus.
 
    HEALTH  FACILITY OBLIGATIONS are  obligations of issuers  whose revenues are
derived from services  provided by  hospitals or other  health care  facilities,
including  nursing  homes. The  ability  of such  issuers  to make  debt service
payments on  these  obligations  is  dependent  on  various  factors,  including
occupancy  levels  of the  facility, demand  for  services, wages  of employees,
overhead  expenses,  competition  from   other  similar  providers,   government
regulation,  the cost of  malpractice insurance, and  the degree of governmental
financial assistance, including Medicare and Medicaid.
 
    HOUSING OBLIGATIONS are obligations of issuers whose revenues are  primarily
derived  from mortgage loans on single family residences or housing projects for
low to moderate income families. Housing obligations are generally prepayable at
any time and  therefore their average  life will ordinarily  be less than  their
stated  maturities. The ability of such issuers to make debt service payments on
these obligations is dependent on  various factors, including occupancy  levels,
rental  income, mortgage default rates,  taxes, operating expenses, governmental
regulations and the appropriation of subsidies.
 
    INDUSTRIAL  REVENUE  OBLIGATIONS  are  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. Debt  service  payment on  IRBs  is dependent  upon  various  factors,
including  the creditworthiness of the corporate operator of the project and, if
applicable, corporate guarantor, revenues  generated from the project,  expenses
associated with the project and regulatory and environmental restrictions.
 
    ELECTRIC  UTILITY OBLIGATIONS are obligations  of issuers whose revenues are
primarily derived from the sale of electric energy. The ability of such  issuers
to  make  debt service  payments on  these obligations  is dependent  on various
factors, including the rates  for electricity, the  demand for electricity,  the
degree  of competition, governmental regulation,  overhead expenses and variable
costs, such as fuel.
 
    TRANSPORTATION FACILITY REVENUE OBLIGATIONS are 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 ability of issuers
to make  debt  service payments  on  airport  obligations is  dependent  on  the
capability  of airlines to  meet their obligations under  use agreements. Due to
increased competition,  deregulation, increased  fuel costs  and other  factors,
many  airlines may  have difficulty  meeting their  obligations under  these use
agreements. 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. The revenue of issuers of transit system obligations will
be affected by variations in utilization, which  in turn may be affected by  the
degree  of  local governmental  subsidization, competition  from other  forms of
transportation, and  increased costs.  Port  authorities derive  their  revenues
primarily  from fees imposed  on ships using the  facilities which may fluctuate
depending on  the local  economy  and on  competition  from competing  forms  of
transportation  such  as air,  rail and  trucks. The  revenues of  issuers which
derive their  payments  from bridge,  road  or  tunnel toll  revenues  could  be
adversely  affected  by  increases  in fuel  costs,  competition  from toll-free
vehicular bridges and roads and alternative modes of transportation.
 
    WATER AND/OR SEWERAGE OBLIGATIONS are obligations of issuers whose  revenues
are  payable from user fees from the sale of water and/or sewerage services. The
problems   of   such    issuers   include   the    ability   to   obtain    rate
 
                                       4
<PAGE>
increases,  population  declines, the  limitations  on operations  and increased
costs and delays attributable to environmental considerations, the  difficulties
obtaining  new supplies of fresh water,  the effect of conservation programs and
in "no-growth" zoning ordinances.
 
    UNIVERSITY AND COLLEGE REVENUE OBLIGATIONS are obligations of issuers  whose
revenues  are  derived  mainly  from  tuition,  dormitory  revenues,  grants and
endowments. General  problems faced  by  such issuers  include declines  in  the
number  of "college" age  individuals, possible inability  to raise tuitions and
fees, 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.
 
    DEDICATED-TAX SUPPORTED  OBLIGATIONS are  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  OBLIGATIONS  are  obligations that  are  secured  by lease
payments of a  governmental entity  and 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 OBLIGATIONS AND STRIPPED OBLIGATIONS are bonds which
were  issued with  nominal interest  rates less than  the rates  then offered by
comparable securities and as  a consequence were originally  sold at a  discount
from  their face,  or par,  values. 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 obligations 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.  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  obligations, 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  "Schedule of  Investments"  appearing in  Part A  of  this
Prospectus 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 ("Stripped Obligations").  Each
Stripped  Obligation has been purchased at a discount from the amount payable at
maturity. A Stripped Obligation  therefore has economic characteristics  similar
to zero coupon bonds, as described above.
 
    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  issue  discount  obligations  or  Stripped
Obligations  may be  deemed to be  received in  the year of  accrual even though
there is no corresponding cash payment.
 
                                       5
<PAGE>
    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.  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.
 
COMPOSITION OF TRUSTS
 
Each Trust initially consists  of delivery statements  relating to contracts  to
purchase  Bonds (or of such Bonds) as are listed under "Schedule of Investments"
in Part A of this Prospectus 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  a  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. 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  believes it  unlikely, 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  in Part  A of  this Prospectus  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 in Part A of this Prospectus (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" in Part A of this Prospectus. 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 "Schedule of Investments" in Part A of
this Prospectus.
 
    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 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  must satisfy the  criteria previously  described for the
Trusts and shall be substantially identical to the Failed Bonds they replace  in
terms  of (i) the exemption from federal  and state taxation; (ii) maturity and;
(iii) cost to the Trust. In addition,  Replacement Bonds 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.
 
    To  the extent Replacement Bonds are  not acquired, 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 "Schedule of Investments"  in Part A of
 
                                       6
<PAGE>
this Prospectus  and  in  most  cases  pursuant  to  sinking  fund,  special  or
extraordinary  redemption provisions. 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.  The exercise of redemption  or call provisions is
more likely to occur in  situations where when the  Bonds have an offering  side
evaluation  which represents a premium  over par (as opposed  to a discount from
par). (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  "WHAT IS THE TAX STATUS OF  UNITHOLDERS?" and "WHEN ARE DISTRIBUTIONS MADE
TO UNITHOLDERS?" in Part B and the  "Schedule of Investments" in Part A of  this
Prospectus.)
 
    CERTAIN  TAX  MATTERS;  LITIGATION.    Certain of  the  Bonds  in  a Trust's
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.
 
WHY AND HOW ARE THE BONDS INSURED?
 
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 the Bonds from the MBIA Insurance Corporation
(the "Insurer"). Certain of the  Bonds in an 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 claims-paying ability of both
the Insurer  and the  Association was  rated  "AAA Prime  Grade" by  Standard  &
Poor's.  Moody's rates  all bond  issuers insured by  either the  Insurer or the
Association "Aaa" and  short-term loans "MIG  1," both designated  to be of  the
highest  quality.  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).
 
    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.
 
                                       7
<PAGE>
    If a Bond in a Traditional  Trust is insured, the "Schedule of  Investments"
appearing in Part A of this Prospectus will identify the insurer. The Sponsor to
date  has purchased  and presently  intends to  purchase insurance  for Bonds in
Traditional Trusts exclusively from the Insurer. 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 and/or Moody's  have
rated the claims-paying ability of each insurer "AAA" or "Aaa," respectively.
 
    The  Insurer is the principal operating subsidiary of MBIA, Inc., a New York
Stock Exchange listed company. MBIA, Inc. is  not obligated to pay the debts  of
or  claims against the  Insurer. The Insurer is  a limited liability corporation
rather than a  several liability association.  The Insurer is  domiciled in  the
State  of New York and licensed to do business in all 50 states, the District of
Columbia, 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  June  30,  1995 the  Insurer  had  admitted assets  of  $3.6  billion
(unaudited),  total liabilities of  $2.4 billion (unaudited),  and total capital
and surplus of $1.2 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.
 
    The Association is comprised  of the five insurance  companies set forth  in
the following table, which provides certain unaudited financial information with
respect to each of the five insurance companies comprising the Association.
 
                      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>
 
    Insurance  companies  are subject  to  extensive regulation  and supervision
where they  do  business  by  state insurance  commissioners  who  regulate  the
standards of solvency which must be maintained, the nature of and limitations on
investments, reports of financial condition, and requirements regarding reserves
for  unearned premiums, losses  and other matters. A  significant portion of the
assets of insurance companies are required by law to be held in reserve  against
potential claims on policies and is not available to general creditors. Although
the  federal government  does not  regulate the  business of  insurance, federal
initiatives including  pension  regulation,  controls  on  medical  care  costs,
minimum  standards for no-fault automobile insurance, national health insurance,
tax law changes affecting life insurance  companies and repeal of the  antitrust
exemption  for  the insurance  business can  significantly impact  the insurance
business.
 
    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. See the Information
Supplement--for further information concerning insurance.
 
    Because the insurance on the Bonds, if any, 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.
 
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
 
                                       8
<PAGE>
Trustee) plus a sales charge set forth  in "Essential Information" in Part A  of
this  Prospectus, 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. See "UNIT VALUE AND EVALUATION."
 
    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 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  the  Trustee pending
completion of these purchases. All distributions on Units held in escrow will be
credited  to  such  Unitholder's  account.  If  total  purchases  prior  to  the
expiration  of the letter of intent period  equal or exceed the amount specified
in a Unitholder's letter of intent, the Units held in escrow will be transferred
to such Unitholder's account.  If the total purchases  are less than the  amount
specified,  the Unitholder involved must pay the  Sponsor an amount equal to the
difference between the amounts  paid for these purchases  and the amounts  which
would  have  been paid  if the  higher sales  charge had  been applied.  If such
Unitholder 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 TRUSTS         LONG INTERMEDIATE TRUSTS        INTERMEDIATE
                                                                                                                 TRUSTS
                                          -----------------------------     -----------------------------     ------------
<S>                                       <C>              <C>              <C>              <C>              <C>
                                            PERCENT          PERCENT          PERCENT          PERCENT          PERCENT
                                               OF             OF NET             OF             OF NET             OF
                                            OFFERING          AMOUNT          OFFERING          AMOUNT          OFFERING
            NUMBER OF UNITS*                 PRICE           INVESTED          PRICE           INVESTED          PRICE
- ----------------------------------------  ------------     ------------     ------------     ------------     ------------
Less than 500...........................         4.90 %           5.152%           4.25 %           4.439%           3.90%
500 but less than 1,000.................         4.75             4.987            4.15             4.330            3.70
1,000 but less than 2,500...............         4.50             4.712            3.85             4.004            3.50
2,500 but less than 5,000...............         4.25             4.439            3.60             3.734            3.25
5,000 but less than 10,000..............         3.50             3.627            3.35             3.466            3.00
10,000 but less than 25,000.............         3.00             3.093            3.00             3.093            2.75
25,000 but less than 50,000.............         2.50             2.564            2.50             2.564            2.50
50,000 or more..........................         2.00             2.041            2.00             2.041            2.00
 
<CAPTION>
 
<S>                                       <C>
                                            PERCENT
                                             OF NET
                                             AMOUNT
            NUMBER OF UNITS*                INVESTED
- ----------------------------------------  ------------
Less than 500...........................         4.058%
500 but less than 1,000.................         3.842
1,000 but less than 2,500...............         3.627
2,500 but less than 5,000...............         3.359
5,000 but less than 10,000..............         3.093
10,000 but less than 25,000.............         2.828
25,000 but less than 50,000.............         2.564
50,000 or more..........................         2.041
</TABLE>
<TABLE>
<CAPTION>
                                            SHORT INTERMEDIATE TRUSTS
                                                                                  SHORT TERM TRUSTS
                                          -----------------------------     -----------------------------
<S>                                       <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. See "UNIT VALUE AND EVALUATION."  The effect of this method of sales
charge calculation will be that different sales charge
 
                                       9
<PAGE>
rates will be applied to the various  Bonds in a Trust portfolio based upon  the
maturities  of such Bonds. 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>          <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.............     1.523 %     1.446 %      1.369 %      1.317 %      1.215 %      1.061 %       .900 %       .750 %
2 but less than 3.............     2.041       1.937        1.833        1.729        1.626        1.420        1.225        1.030
3 but less than 4.............     2.564       2.433        2.302        2.175        2.041        1.781        1.546        1.310
4 but less than 5.............     3.093       2.961        2.828        2.617        2.459        2.175        1.883        1.590
5 but less than 7.............     3.627       3.433        3.239        3.093        2.881        2.460        2.165        1.870
7 but less than 10............     4.167       3.951        3.734        3.520        3.239        2.828        2.489        2.150
10 but less than 13...........     4.712       4.467        4.221        4.004        3.788        3.253        2.842        2.430
13 but less than 16...........     5.263       4.988        4.712        4.439        4.167        3.627        3.169        2.710
16 or more....................     5.820       5.542        5.263        4.987        4.603        4.004        3.500        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).  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.
 
    Pursuant to the terms of the Indenture, the Trustee may terminate a Trust if
the  net asset value of such Trust, as shown by any evaluation, is less than 20%
of the original principal amount of the Trust.
 
    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.
 
    Accrued interest from the preceding Record  Date to, but not including,  the
settlement  date of the transaction (three business days after purchase) will be
added to the Public Offering Price to determine the purchase price of Units. See
"WHAT IS ACCRUED INTEREST?".
 
    The graduated sales  charges set forth  above 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  ("immediate family members") 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 "HOW
UNITS OF  THE TRUSTS  ARE DISTRIBUTED  TO  THE PUBLIC?")  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.
 
                                       10
<PAGE>
    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 between 1/2% to 2% more than the BID
prices of such  Bonds. 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 this purpose, a "business
day" shall be any day on which  the Exchange is normally open. (See "UNIT  VALUE
AND EVALUATION.")
 
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. UNITHOLDERS WHO WISH  TO DISPOSE OF  THEIR
UNITS SHOULD INQUIRE OF THE TRUSTEE OR THEIR BROKER AS TO THE CURRENT REDEMPTION
PRICE. (See "HOW UNITS MAY BE REDEEMED WITHOUT CHARGE?".) 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 (three business days after purchase) as the Trustee
can  complete  the mechanics  of registration,  normally  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 "HOW UNITS MAY BE REDEEMED WITHOUT CHARGE?".)
 
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.  Accrued
interest  does not  include accrual  of original  issue discount  on zero coupon
bonds, Stripped Obligations  or other  original issue  discount bonds.  Interest
accrues  to the  benefit of Unitholders  commencing with the  settlement date of
their purchase transaction.
 
    In an effort to reduce the  amount of accrued interest that investors  would
have  to pay in addition to the Public Offering Price, the Trustee has agreed to
advance to each Trust the amount of accrued interest due on the Bonds as of  the
Date  of Deposit (which has been designated  the first Record Date for all plans
of distribution).  This accrued  interest will  be paid  to the  Sponsor as  the
holder  of record of all Units on  the Date of Deposit. Consequently, the amount
of accrued interest  to be  added to  the Public  Offering Price  of Units  will
include  only accrued interest from  the Date of Deposit  to, but not including,
the date of  settlement of the  investor's purchase (three  business days  after
purchase), less any distributions from the related Interest Account. The Trustee
will  recover its  advancements (without interest  or other cost  to the Trusts)
from interest received on the Bonds deposited in each Trust.
 
    The Trustee has no  cash for distribution to  Unitholders until it  receives
interest  payments on the Bonds in the  Trusts. Since municipal bond interest is
accrued daily but  paid only  semi-annually, during  the initial  months of  the
Trusts,  the Interest Accounts,  consisting of accrued  but uncollected interest
and collected interest  (cash), will  be predominantly  the uncollected  accrued
interest that is not available for distribution. However, due to advances by the
Trustee,  the Trustee will provide a first distribution between approximately 30
and 60 days after the Date of Deposit. Assuming each Trust retains its  original
size  and composition  and expenses  and fees  remain the  same, annual interest
collected and distributed  will approximate  the estimated  Net Annual  Interest
Income  stated herein. However, the  amount of accrued interest  at any point in
time will  be  greater than  the  amount that  the  Trustee will  have  actually
received and distributed to the Unitholders. Therefore, there will always remain
an  item of  accrued interest  that is  included in  the Purchase  Price and the
redemption price of the Units.
 
    Interest is accounted  for daily and  a proportionate share  of accrued  and
undistributed  interest computed from the preceding  Record Date is added to the
daily valuation of each Unit of each  Trust. (See Part A of this Prospectus  and
"WHEN ARE DISTRIBUTIONS MADE TO UNITHOLDERS?".) As Bonds mature, or are redeemed
or  sold,  the  accrued  interest  applicable to  such  bonds  is  collected and
subsequently distributed to Unitholders. Unitholders who
 
                                       11
<PAGE>
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.
 
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  expected  to be  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  of  any premium  over,  or discount  from,  the par  (maturity) value
inherent in the bond's purchase price. In the calculation of 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. This weighted  average yield is  then
adjusted  to  reflect estimated  expenses, is  compounded, and  is reduced  by a
factor which represents the amortization of  the sales charge over the  expected
average  life of the Trust. The Estimated  Long Term Return calculation does not
take into account the effect  of a first distribution which  may be less than  a
regular  distribution or may  be paid at some  point after 30  days (or a second
distribution which may be  less than a normal  distribution for Unitholders  who
choose  quarterly or  semi-annual plans of  distribution), and it  also does not
take into account the difference in timing of payments to Unitholders who choose
quarterly or semi-annual plans  of distribution, each of  which will reduce  the
return.
 
    Estimated  Current Return  is computed by  dividing the  Net Annual Interest
Income per Unit by the Public Offering Price. In contrast to Estimated Long Term
Return, Estimated 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
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 "OTHER INFORMATION."
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. 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.
 
    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" appearing
in Part A  of this  Prospectus, "COMPOSITION  OF TRUSTS"  and "WHAT  IS THE  TAX
STATUS OF UNITHOLDERS?")
 
    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  a
Trust  and returns  over specified periods  on other similar  Nuveen Trusts with
returns on taxable investments such as corporate or U.S. Government bonds,  bank
CD's  and  money  market accounts  or  money  market funds,  each  of  which has
investment characteristics  that  may  differ  from those  of  the  Trust.  U.S.
Government  bonds, for example, are  backed by the full  faith and credit of the
U.S. Government and bank CD's and money market accounts are insured by an agency
of the federal government. Money market accounts and money market funds  provide
stability  of principal, but pay interest at  rates that vary with the condition
of the short-term debt market. The investment characteristics of the Trusts  are
described more fully elsewhere in the Prospectus.
 
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 "WHY AND HOW ARE THE BONDS INSURED?".)
 
                                       12
<PAGE>
    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 Part  A of  this Prospectus.)  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.
 
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 Part
A of this Prospectus. 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.  If  the
interest  on a Bond should be determined to be taxable, the Bond would generally
have to  be sold  at a  substantial discount.  In addition,  investors could  be
required  to pay  income tax  on interest  received prior  to the  date of which
interest is determined to be taxable.
 
    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 tax-exempt 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. 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.
 
    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 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
 
                                       13
<PAGE>
        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 Part A of this Prospectus.
 
    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 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.
 
    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.
 
    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 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 PART  A OF THIS  PROSPECTUS, 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.
 
WHAT ARE NORMAL TRUST OPERATING EXPENSES?
 
No  annual advisory  fee is charged  to the  Trusts by the  Sponsor. The Sponsor
does, however, receive a fee as set  forth in "Essential Information" in Part  A
of  this  Prospectus  for regularly  evaluating  the Bonds  and  for maintaining
surveillance over the portfolio. (See "UNIT VALUE AND EVALUATION.")
 
    The Trustee receives for ordinary recurring services an annual fee for  each
plan  of distribution  for each  Trust as  set forth  in "Essential Information"
appearing in Part A of this Prospectus. 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 of  Shelter" 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.
 
                                       14
<PAGE>
    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,
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 additional expenses of the Trusts
and, when paid  by or are  owed to  the Trustee, are  secured by a  lien on  the
assets  of the  Trust or Trusts  to which  such expenses are  allocable: (1) the
expenses and costs of any action undertaken by the Trustee to protect the Trusts
and the  rights  and interests  of  the Unitholders;  (2)  all taxes  and  other
governmental  charges upon the Bonds or any part of the Trusts (no such taxes or
charges are  being  levied  or  made  or,  to  the  knowledge  of  the  Sponsor,
contemplated); (3) amounts payable to the Trustee as fees for ordinary recurring
services  and for extraordinary non-recurring  services rendered pursuant to the
Indenture, all disbursements and expenses including counsel fees (including fees
of bond  counsel which  the Trustee  may retain)  sustained or  incurred by  the
Trustee  in connection therewith; and (4)  any losses or liabilities accruing to
the Trustee without negligence, bad faith or willful misconduct on its part. The
Trustee is empowered to sell  Bonds in order to pay  these amounts if funds  are
not otherwise available in the applicable Interest and Principal Accounts.
 
    The  Indenture requires each Trust  to be audited on  an annual basis at the
expense of the Trust by independent public accountants selected by the  Sponsor.
The  Trustee  shall not  be  required, however,  to cause  such  an audit  to be
performed if its cost to a Trust shall exceed $.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.
 
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. See Part  A of  this
Prospectus for details of distributions per Unit of each Trust under the various
plans  based upon estimated Net  Annual Interest Income at  the Date of Deposit.
The amount of  the regular distributions  will generally change  when Bonds  are
redeemed, mature or are sold or when fees and expenses increase or decrease. 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  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
 
                                       15
<PAGE>
Trustee  not later than  the semi-annual Record  Date to be  effective as of the
semi-annual distribution  following  the  subsequent  semi-annual  Record  Date.
Unitholders  are requested to make any such  changes within 45 days prior to the
applicable Record  Date.  Certificates should  only  be sent  by  registered  or
certified  mail to minimize the possibility of  their being lost or stolen. (See
"OWNERSHIP AND TRANSFER OF UNITS.")
 
    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. In addition, 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.
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.
 
ACCUMULATION PLAN
 
The  Sponsor  is  also  the  principal  underwriter  of  the  Accumulation Funds
described  in  the  following  table.  Each  of  these  funds  is  an  open-end,
diversified  management investment company into  which Unitholders may choose to
reinvest  Trust   distributions  automatically,   without  any   sales   charge.
(Reinvestment  generally 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. For a
more detailed description,  Unitholders of  each Accumulation  Fund should  read
carefully  the prospectus of the Accumulation Fund in which they are interested.
For additional information concerning the Accumulation Plan see the  Information
Supplement of this Prospectus.
 
<TABLE>
<CAPTION>
                      ACCUMULATION FUND                                            GENERAL FUND DESCRIPTION
- --------------------------------------------------------------  --------------------------------------------------------------
<S>                                                             <C>
Nuveen Municipal Bond Fund                                      Tax-exempt   income  by   investing  in   long-term  municipal
                                                                securities.
Nuveen Tax-Free  Reserves,  Inc.  and  Nuveen  Tax-Free  Money
Market Fund, Inc.:
Nuveen  Massachusetts  Tax-Free Money  Market Fund  Nuveen New  Tax-exempt and in certain cases double and triple tax-  exempt
York Tax-Free Money Market Fund                                 "money market" funds with checkwriting privileges.
Nuveen California Tax-Free Fund:
Nuveen California Tax-Free Value Fund                           Double  tax-exempt income by investing in long-term investment
                                                                grade California tax-exempt securities.
Nuveen California Insured Tax-Free Value Fund                   Double tax-exempt income  by investing  in insured  California
                                                                tax-exempt securities.
Nuveen California Tax-Free Money Market Fund                    California  tax-exempt "money  market" fund  with checkwriting
                                                                privileges.
Nuveen Tax-Free  Bond Fund,  Inc.  and the  Nuveen  Multistate
Tax-Free Trust:
Nuveen  Massachusetts  Tax-Free  Value Fund,  Nuveen  New York  Double and  in  certain  cases  triple  tax-exempt  income  by
Tax-Free  Value Fund, Nuveen Ohio  Tax-Free Value Fund, Nuveen  investing in tax-exempt securities in the state for which  the
New  Jersey Tax-Free Value Fund, Nuveen Arizona Tax-Free Value  portfolio is named.
Fund, Nuveen  Florida  Tax-Free Value  Fund,  Nuveen  Maryland
Tax-Free  Value  Fund,  Nuveen Michigan  Tax-Free  Value Fund,
Nuveen Pennsylvania Tax-Free  Value Fund  and Nuveen  Virginia
Tax-Free Value Fund
Nuveen Insured Tax-Free Bond Fund, Inc.:
Nuveen  Insured  Municipal  Bond  Fund,  Nuveen  Massachusetts  Tax-exempt and in certain cases double and triple tax-  exempt
Insured  Tax-Free Value Fund  and the Nuveen  New York Insured  funds investing in insured tax-exempt securities in the  state
Tax-Free Value Fund.                                            for which the portfolio is named.
</TABLE>
 
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
 
                                       16
<PAGE>
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.
 
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, if any, and the amount  of
other  receipts (received  since the preceding  distribution) being distributed,
expressed in each case  as a dollar  amount representing the  pro rata share  of
each Unit of a Trust outstanding and a year to date summary of all distributions
paid  on said Units.  Within a reasonable period  of time after  the end of each
calendar year, the Trustee shall furnish to  each person who at any time  during
the  calendar  year was  a registered  Unitholder  of a  Trust a  statement with
respect to  such  Trust  (i)  as to  the  Interest  Account:  interest  received
(including  amounts  representing  interest  received  upon  any  disposition of
Bonds), and, except  for any  State Trust, the  percentage of  such interest  by
states  in which the issuers  of the Bonds are  located, deductions for fees and
expenses of such Trust, redemption of Units and the balance remaining after such
distributions and deductions,  expressed in  each case  both as  a total  dollar
amount  and as  a dollar  amount representing  the pro  rata share  of each Unit
outstanding on the  last business  day of  such calendar  year; (ii)  as to  the
Principal  Account: the dates of  disposition of any Bonds  and the net proceeds
received therefrom (excluding  any portion representing  accrued interest),  the
amount  paid for purchase of Replacement  Bonds, the amount paid upon redemption
of Units, deductions for  payment of applicable taxes  and fees and expenses  of
the  Trustee, and the balance remaining  after such distributions and deductions
expressed both as a total dollar amount and as a dollar amount representing  the
pro  rata  share of  each  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.
 
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.
 
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 of  the United  States  of
America,  and Units  of State Trusts  only in the  state for which  the Trust is
named and selected other states.
 
                                       17
<PAGE>
    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. 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.
 
    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:
 
<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 "MARKET  FOR UNITS."  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 "HOW IS THE PUBLIC OFFERING PRICE DETERMINED?",
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 "HOW IS THE PUBLIC OFFERING PRICE DETERMINED?").
 
    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 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
 
                                       18
<PAGE>
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.
 
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.
 
   
    For Trusts allowing optional plans  of distribution, 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  address listed on the back cover  of
this  Part B of  the Prospectus, 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.   This
indemnification  must be in the form of an Open Penalty Bond of Indemnification.
The premium for such an indemnity bond may vary, 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.
 
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 address  listed  on  the  back  cover of  this  Part  B  of  the  Prospectus
(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 above, or provide satisfactory indemnity
required  in  connection with  lost, stolen  or  destroyed Certificates  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. (See "OWNERSHIP AND TRANSFER OF UNITS".) 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. The time  a
telephone redemption request is received
 
                                       19
<PAGE>
determines the "date of tender" as discussed below. The redemption proceeds will
be mailed within three business days following the telephone redemption request.
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.
Unitholders  should  check with  the Trustee  or their  broker to  determine the
Redemption Price before tendering Units.
 
    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 "HOW BONDS MAY  BE REMOVED FROM  THE TRUSTS.") 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 1/2%  to 2%  of
principal amount. 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 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 a specified percentage 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."
 
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 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 "HOW UNITS MAY BE REDEEMED WITHOUT
CHARGE.")  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.
 
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 Part A of  this Prospectus and "RISK  FACTORS" for a discussion of
call provisions of portfolio Bonds.
 
                                       20
<PAGE>
    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. 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 "COMPOSITION OF  TRUSTS" 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 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.
 
INFORMATION ABOUT THE TRUSTEE
 
The Trustee and its address are stated on  the back cover of this Part B of  the
Prospectus. The Trustee is subject to supervision and examination by the Federal
Deposit  Insurance Corporation,  the Board of  Governors of  the Federal Reserve
System and either the Comptroller of the Currency or state banking authorities.
 
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.
 
                                       21
<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.
 
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 16 mutual funds and 60  closed-end
funds.  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  Sponsor  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.
 
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 "COMPOSITION OF TRUSTS" 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.
 
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" appearing in Part A of this Prospectus.)
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
 
                                       22
<PAGE>
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
appearing  in  Part A  of this  Prospectus.  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 "Statement  of  Condition" and  "Schedule  of Investments"  at  Date  of
Deposit  included  in Part  A of  this  Prospectus have  been audited  by Arthur
Andersen LLP, independent public  accountants, as indicated  in their report  in
Part  A  of  this Prospectus,  and  are  included herein  in  reliance  upon the
authority of said firm as experts in giving said report.
 
SUPPLEMENTAL INFORMATION
 
    Upon written or telephonic request to the Trustee, investors will receive at
no cost to  the investor supplemental  information about this  Trust, which  has
been  filed  with the  Securities  and Exchange  Commission  and is  intended to
supplement information contained in  Part A and Part  B of this Prospectus.  The
supplemental  information includes more  detailed information concerning certain
of the Bonds included in the Trusts contained in the applicable Series and  more
specific   risk  information  concerning  the   individual  state  Trusts.  This
supplement also includes  additional general information  about the Sponsor  and
the Trusts.
 
                                       23
<PAGE>
                         NUVEEN  Tax-Exempt Unit Trusts
 
   
                              PROSPECTUS -- PART B
                               SEPTEMBER 1, 1995
    
 
<TABLE>
<C>                       <S>        <C>
                 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             The Chase Manhattan Bank, N.A.
                                     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 supplemental information
or  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.


<PAGE>
                          NUVEEN TAX-FREE UNIT TRUSTS
 
                 ---------------------------------------------
 
                             INFORMATION SUPPLEMENT
 
   
                               NUVEEN SERIES 917
    
 
   
                This   Information  Supplement  provides  additional
            information concerning  the  structure,  operations  and
            risks  of a Nuveen Tax-Free Unit  Trust not found in the
            prospectuses for the Trusts. This Information Supplement
            is not  a prospectus  and does  not include  all of  the
            information  that a prospective investor should consider
            before investing in a Trust. This Information Supplement
            should be read  in conjunction with  the prospectus  for
            the  Trust in which an investor is considering investing
            ("Prospectus"). Copies of the Prospectus can be obtained
            by calling  or  writing  the Trustee  at  the  telephone
            number   and  address   indicated  in  Part   B  of  the
            Prospectus. This Information Supplement has been created
            to supplement information contained in the Prospectus.
    
 
   
                This Information  Supplement  is dated  February  5,
            1997.   Capitalized  terms  have  been  defined  in  the
            Prospectus.
    
 
                               TABLE OF CONTENTS
 
               --------------------------------------------------
 
<TABLE>
<S>                                                                           <C>
GENERAL RISK DISCLOSURE.....................................................           2
  Health Care Facility Obligations..........................................           2
  Housing Obligations.......................................................           2
  Single Family Mortgage Revenue Bonds......................................           2
  Federally Enhanced Obligations............................................           3
  Industrial Revenue Obligations............................................           3
  Electric Utility Obligations..............................................           3
  Transportation Facility Revenue Bonds.....................................           4
  Water and/or Sewerage Obligations.........................................           4
  University and College Revenue Obligations................................           4
  Bridge Authority and Tollroad Obligations.................................           4
  Dedicated-Tax Supported Bonds.............................................           4
  Municipal Lease Bonds.....................................................           5
  Original Issue Discount Bonds and Stripped Obligations....................           5
WHY AND HOW ARE THE BONDS INSURED?..........................................           6
ACCUMULATION PLAN...........................................................           7
INFORMATION ABOUT THE SPONSOR...............................................           9
DESCRIPTION OF RATINGS......................................................          10
HOW THE TRUST COMPARES PERFORMANCE..........................................          13
HOW TO CALCULATE YOUR ESTIMATED INCOME......................................          14
Appendix A -- New York Disclosure...........................................         A-1
Appendix B -- Ohio Disclosure...............................................         B-1
</TABLE>
 
<PAGE>
GENERAL RISK DISCLOSURE
 
    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 in Part A  of this Prospectus, 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 "Risk Factors" for each Trust.
 
    HEALTH CARE 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  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
 
                                       2
<PAGE>
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 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  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
 
                                       3
<PAGE>
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  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
 
                                       4
<PAGE>
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 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
"WHAT IS THE TAX STATUS OF UNITHOLDERS?" in Part B of this Prospectus.)
 
    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  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.
 
                                       5
<PAGE>
WHY AND HOW ARE THE BONDS INSURED?
 
INSURANCE ON BONDS
 
INSURED TRUSTS--The Insurer's policy unconditionally and irrevocably  guarantees
the  full and complete payment required to be made by or on behalf of the Issuer
to the Paying Agent or its successor of an amount equal to (i) the principal  of
(either  at the stated maturity  or by an advancement  of maturity pursuant to a
mandatory sinking fund  payment) and  interest on,  the Bonds  as such  payments
shall  become due  but shall not  be so  paid (except that  in the  event of any
acceleration of  the  due date  of  such principal  by  reason of  mandatory  or
optional  redemption or acceleration resulting  from default or otherwise, other
than any advancement of maturity pursuant  to a mandatory sinking fund  payment,
the  payments guaranteed by the  Insurer's policy shall be  made in such amounts
and at such times as  such payments of principal would  have been due had  there
not  been any such acceleration); and (ii) the reimbursement of any such payment
which is subsequently removed from  any owner of the  Bonds purusant to a  final
judgment  by a court of competent  jurisdiction that such payment constitutes an
avoidable preference  to  such  owner  within  the  meaning  of  any  applicable
bankruptcy law (a "Preference").
 
    The  Insurer's policy does not insure against loss of any prepayment premium
which may at any time be payable with respect to any Bond. The Insurer's  policy
does  not, under any circumstance, insure against loss relating to: (i) optional
or mandatory redemptions (other than  mandatory sinking fund redemptions);  (ii)
any  payments to be made on an accelerated basis; (iii) payments of the purchase
price of Bonds upon tender by an owner thereof; or (iv) any Preference  relating
to  (i) through (iii) above.  The Insurer's policy also  does not insure against
nonpayment of  principal  of  or  interest  on  the  Bonds  resulting  from  the
insolvency,  negligence or any other act or  omission of the Paying Agent or any
other paying agent for the Bonds.
 
    Upon receipt of  telephonic notice,  such notice  subsequently confirmed  in
writing  by registered or certified  mail, or upon receipt  of written notice by
registered or certified mail, by the Insurer from the Paying Agent or any  owner
of  a Bond the  payment of an  insured amount for  which is then  due, that such
required payment has not been made, the Insurer on the due date of such  payment
or within one business day after receipt of notice of such nonpayment, whichever
is later, will make a deposit of funds, in an account with State Street Bank and
Trust Company, N.A., in New York, New York, or its successor, sufficient for the
payment  of any such  insured amounts which  are then due.  Upon presentment and
surrender of such Bonds or presentment of  such other proof of ownership of  the
Bonds,  together with any appropriate instruments  of assignment to evidence the
assignment of the insured amounts due on  the Bonds as are paid by the  Insurer,
and  appropriate instruments to  effect the appointment of  the Insurer as agent
for such owners  of the  Bonds in  any legal  proceeding related  to payment  of
insured  amounts on the Bonds, such instruments  being in a form satisfactory to
State Street Bank and Trust Company,  N.A. State Street Bank and Trust  Company,
N.A.  shall disclose to such  owners or the Paying  Agent payment of the insured
amounts due on  such Bonds, less  any amount held  by the Paying  Agent for  the
payment of such insured amounts and legally available therefor.
 
    The  Insurer is the principal operating subsidiary of MBIA, Inc., a New York
Stock Exchange listed company. MBIA Inc. is not obligated to pay the debts of or
claims against the Insurer. The  Insurer is domiciled in  the State of New  York
and  licensed to do business in and subject  to regulation under the laws of all
50 states,  the District  of  Columbia, the  Commonwealth  of Puerto  Rico,  the
Commonwealth  of the Northern Mariana Islands,  the Virgin Islands of the United
States and the Territory of Guam. The Insurer has two European branches, one  in
the  Republic of France and the other in the Kingdom of Spain. New York has laws
prescribing minimum capital requirements, limiting classes and concentrations of
investments and requiring  the approval of  policy rates and  forms. State  laws
also  regulate the amount of both the aggregate and individual risks that may be
insured, the  payment  of dividends  by  the  insurer, changes  in  control  and
transactions among affiliates. Additionally, the Insurer is required to maintain
contingency  reserves  on its  liabilities in  certain  amounts and  for certain
periods of time.
 
   
    As of December  31, 1995  the Insurer had  admitted assets  of $3.8  billion
(audited),  total liabilities of  $2.5 billion (audited),  and total capital and
surplus of  $1.3  billion  (audited) determined  in  accordance  with  statutory
accounting   practices   prescribed   or  permitted   by   insurance  regulatory
authorities. As of September 30, 1996,  the Insurer had admitted assets of  $4.3
billion  (unaudited), total liabilities  of $2.9 billion  (unaudited), and total
capital and surplus of  $1.4 billion (unaudited)  determined in accordance  with
statutory  accounting practices prescribed or  permitted by insurance regulatory
authorities.
    
 
    Furthermore, copies of the Insurer's year end financial statements  prepared
in  accordance with statutory accounting  practices are available without charge
from the Insurer.  A copy of  the Annual Report  on Form 10-K  of MBIA, Inc.  is
available  from  the Insurere  or the  Securities  and Exchange  Commission. The
address of the Insurer is 113 King Street, Armonk, New York 10504. The telephone
number of the Insurer is (914) 273-4545.
 
    Moody's Investors Service  rates the  claims paying ability  of the  Insurer
"Aaa".
 
                                       6
<PAGE>
    Standard  & Poor's Ratings Service, a division of the McGraw Hill Companies,
Inc. rates the claims paying ability of the Insurer "AAA".
 
    Fitch Investors  Service,  L.P., rates  the  claims paying  ability  of  the
Insurer "AAA".
 
    Each rating of the Insurer should be evaluated independently. 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. 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 guaranty the market price of the Bonds nor does it guaranty that the ratings
on the Bonds will not be revised or withdrawn.
 
TRADITIONAL  TRUSTS--Insurance guaranteeing the timely payment, when due, of all
principal and interest  on certain Bonds  in a Traditional  Trust may have  been
obtained  by the Sponsor, issuer or underwriter of the particular Bonds involved
or by another party. Such  insurance, which provides coverage substantially  the
same  as that  obtained with  respect to  Bonds in  Insured Trusts  as described
above, is effective so long as the  insured Bond is outstanding and the  insurer
remains  in business. Insurance relates  only to the particular  Bond and not to
the Units offered hereby or to their market value. Insured Bonds have received a
rating of "Aaa" by  Moody's Investors Service, Inc.  and/or "AAA" by Standard  &
Poor's Corporation in recognition of such insurance.
 
    If  a Bond in a Traditional Trust is insured, the Schedule of Investments in
Part A of  this Prospectus  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
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 Corporation has rated
the claims-paying ability of each  insurer "AAA," and Moody's Investors  Service
has  rated  all bonds  insured by  each such  insurer, except  ConnieLee, "Aaa."
Moody's Investor's Service gives no ratings for bonds insured by ConnieLee.
 
    Because any such insurance  will be effective so  long as the insured  Bonds
are  outstanding, such insurance  will be taken into  account in determining the
market value  of  such Bonds  and  therefore  some value  attributable  to  such
insurance  will be included in the value of the Units of the Trust that includes
such Bonds. The insurance does not,  however, guarantee the market value of  the
Bonds or of the Units.
 
ACCUMULATION PLAN
 
   
The  Sponsor, John Nuveen & Co.  Incorporated, is also the principal underwriter
of the Accumulation Funds listed in the following table. Each of these funds  is
an  open-end, diversified  management investment company  into which Unitholders
may choose  to reinvest  Trust distributions  automatically, without  any  sales
charge.  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  a wholly-owned subsidiary of the  Sponsor.
Unitholders  should contact their financial adviser  or the Sponsor to determine
which of  the Accumulation  Funds they  may reinvest  into, as  reinvestment  in
certain of the Accumulation Funds may be restricted to residents of a particular
state  or states. Unitholders may obtain a prospectus for each Accumulation Fund
through their financial adviser or through the Sponsor at (800) 621-7227. For  a
more  detailed  description,  Unitholders  should  read  the  prospectus  of the
Accumulation Fund in which they are interested.
    
 
   
The following is a complete list of the Accumulation Funds currently  available,
as  of  the  Date  of  Deposit of  this  Prospectus,  to  Unitholders  under the
Accumulation Plan. The list of available Accumulation Funds is subject to change
without the consent of any of the Unitholders.
    
 
                                       7
<PAGE>
ACCUMULATION FUNDS
 
MUTUAL FUNDS
 
NUVEEN FLAGSHIP MUNICIPAL TRUST
 
       Nuveen Municipal Bond Fund
       Nuveen Insured Municipal Bond Fund
       Nuveen Flagship All-American Municipal Bond Fund
       Nuveen Flagship Limited Term Municipal Bond Fund
       Nuveen Flagship Intermediate Municipal Bond Fund
 
NUVEEN FLAGSHIP MULTISTATE TRUST I
 
       Nuveen Flagship Arizona Municipal Bond Fund
       Nuveen Flagship Colorado Municipal Bond Fund
       Nuveen Flagship Florida Municipal Bond Fund
       Nuveen Flagship Florida Intermediate Municipal Bond Fund
       Nuveen Maryland Municipal Bond Fund
       Nuveen Flagship New Mexico Municipal Bond Fund
       Nuveen Flagship Pennsylvania Municipal Bond Fund
       Nuveen Flagship Virginia Municipal Bond Fund
 
NUVEEN FLAGSHIP MULTISTATE TRUST II
 
       Nuveen California Municipal Bond Fund
       Nuveen California Insured Municipal Bond Fund
       Nuveen Flagship Connecticut Municipal Bond Fund
       Nuveen Massachusetts Municipal Bond Fund
       Nuveen Massachusetts Insured Municipal Bond Fund
       Nuveen Flagship New Jersey Municipal Bond Fund
       Nuveen Flagship New Jersey Intermediate Municipal Bond Fund
       Nuveen Flagship New York Municipal Bond Fund
       Nuveen New York Insured Municipal Bond Fund
 
NUVEEN FLAGSHIP MULTISTATE TRUST III
 
       Nuveen Flagship Alabama Municipal Bond Fund
       Nuveen Flagship Georgia Municipal Bond Fund
       Nuveen Flagship Louisiana Municipal Bond Fund
       Nuveen Flagship North Carolina Municipal Bond Fund
       Nuveen Flagship South Carolina Municipal Bond Fund
       Nuveen Flagship Tennessee Municipal Bond Fund
 
NUVEEN FLAGSHIP MULTISTATE TRUST IV
 
       Nuveen Flagship Kansas Municipal Bond Fund
       Nuveen Flagship Kentucky Municipal Bond Fund
       Nuveen Flagship Kentucky Limited Term Municipal Bond Fund
       Nuveen Flagship Michigan Municipal Bond Fund
       Nuveen Flagship Missouri Municipal Bond Fund
       Nuveen Flagship Ohio Municipal Bond Fund
       Nuveen Flagship Wisconsin Municipal Bond Fund
 
Flagship Utility Income Fund
 
Nuveen Growth and Income Stock Fund
 
MONEY MARKET FUNDS
 
Nuveen California Tax-Free Money Market Fund
 
Nuveen Massachusetts Tax-Free Money Market Fund
 
Nuveen New York Tax-Free Money Market Fund
 
Nuveen Tax-Free Reserves, Inc.
 
Nuveen Tax-Free Money Market Fund, Inc.
 
                                       8
<PAGE>
    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.
 
   
    The Transfer Agent of the Accumulation Fund 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 the Transfer
Agent. 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.
    
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-Free 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-Free 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-Exempt 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
 
                                       9
<PAGE>
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  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.
 
    The  Sponsor  offers  a  program   of  advertising  support  to   registered
broker-dealer  firms, banks and bank affiliates  ("Firms") that sell Trust Units
or shares  of  Nuveen Open-End  Tax-Free  Mutual Funds  (excluding  money-market
funds) ("Funds"). Under this program, the Sponsor will pay or reimburse the Firm
for  up  to one  half  of specified  media costs  incurred  in the  placement of
advertisements which jointly feature the Firm  and the Nuveen Funds and  Trusts.
Reimbursements  to the Firm will be based on the number of the Firm's registered
representatives who have sold  Fund Shares and/or Trust  Units during the  prior
calendar  year according to  an established schedule.  Reimbursements under this
program will be made by the Sponsor and not by the Funds or Trusts.
 
DESCRIPTION OF RATINGS*
 
    STANDARD & POOR'S CORPORATION.  A  description of the applicable Standard  &
Poor's Corporation rating symbols and their meanings follows:
 
    A  Standard & Poor's rating is  a current assessment of the creditworthiness
of an obligor with  respect to a specific  debt obligation. This assessment  may
take into consideration obligors such as guarantors, insurers or lessees.
 
    The  rating is not  a recommendation to  purchase, sell or  hold a security,
inasmuch as  it  does not  comment  as to  market  price or  suitability  for  a
particular investor.
 
    The  ratings are  based on  current information  furnished by  the issuer or
obtained by Standard & Poor's from other sources it considers reliable. Standard
& Poor's does not  perform an audit  in connection with any  rating and may,  on
occasion,  rely on unaudited financial information.  The ratings may be changed,
suspended or withdrawn  as a result  of changes in,  or unavailability of,  such
information, or for other circumstances.
 
- ----------
*As published by the rating companies.
 
                                       10
<PAGE>
    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.
 
    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 INVESTORS  SERVICE, INC.    A brief  description of  the  applicable
Moody's Investors Service, Inc. rating symbols and their meanings follows:
 
    Aaa--Bonds which are rated Aaa are judged to be the best quality. They carry
the  smallest degree of investment  risk and are generally  referred to as "gilt
edge." Interest payments are protected by a large or by an exceptionally  stable
margin and principal is secure. While the various protective elements are likely
to  change, such changes  as can be  visualized are most  unlikely to impair the
fundamentally strong position of such issues.
 
                                       11
<PAGE>
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  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.
 
    FITCH  INVESTORS SERVICE, INC.  A brief description  of the applicable Fitch
Investors Service, Inc. rating symbols and their meanings follow:
 
    AAA--Bonds considered  to be  investment  grade and  of the  highest  credit
quality.  The obligor  has an exceptionally  strong ability to  pay interest and
repay principal,  which is  unlikely to  be affected  by reasonably  foreseeable
events.
 
    AA--Bonds considered to be investment grade and of very high credit quality.
The  obligor's  ability to  pay  interest and  repay  principal is  very strong,
although not quite as strong as bonds rated  AAA. Bonds rated in the AAA and  AA
categories are not significantly vulnerable to foreseeable future developments.
 
    A--Bonds  considered to be investment grade  and of high credit quality. The
obligor's ability  to pay  interest  and repay  principal  is considered  to  be
strong, but may be more vulnerable to adverse changes in economic conditions and
circumstances than bonds with higher ratings.
 
    BBB--Bonds  considered  to be  investment grade  and of  satisfactory credit
quality. The obligor's ability to pay interest and repay principal is considered
to be  adequate.  Adverse  changes in  economic  conditions  and  circumstances,
however,  are more likely to  have adverse impact on  these bonds, and therefore
impair timely payment. The likelihood that the ratings of these bonds will  fall
below investment grade is higher than for bonds with higher ratings.
 
    To  provide more detailed indications  of credit quality, the  AA, A and BBB
ratings may be modified by the addition of a plus or minus sign to show relative
standing within these major rating categories.
 
                                       12
<PAGE>
NOTE RATINGS:
 
    FIN-1  Notes assigned  this  rating are  regarded  as having  the  strongest
           degree of assurance for timely payment.
 
    FIN-2  Notes  assigned this rating reflect a  degree of assurance for timely
           payment only slightly less in degree than the highest category.
 
HOW THE TRUST COMPARES PERFORMANCE
 
    The Sponsor may compare the estimated returns of the Trust with the  returns
or  yields  of  other  tax-free  and taxable  investments,  often  on  a taxable
equivalent basis. In addition, the Sponsor  from time to time may quote  various
performance  measures and  studies in  order to  compare the  historical returns
available from an investment  in municipal securities  with investments in  both
tax-free and taxable securities.
 
    In  September 1995, Nuveen  Research prepared one  such study which compared
the after-tax value  of $100,000  initially invested  in 1975  in various  asset
classes  including  municipal  bonds,  treasury bonds  and  corporate  bonds. As
indicated in the chart  provided below, the 20-year  study shows that  municipal
bonds  significantly outperformed corporate and  treasury bonds once the effects
of taxes were  factored in.  In fact, over  the 20-year  period, municipal  bond
returns in dollars were more than double those of treasury bonds.
 
                 AFTER-TAX VALUE OF $100,000 INVESTED IN 1975*
 
    The  graph appearing  on this  page of  the Information  Supplement compares
after-tax total returns  of $100,000  initially in 1975  in each  of the  Lehman
Brothers MuniBond Index, Long-Term Treasury Index and Long-Term Corporate Index.
As  indicated in the graph,  such an investment in  the Lehman Brothers MuniBond
Index, Long-Term  Treasury  Index  and  Long-Term  Corporate  Index  would  have
appreciated  to $448,740,  $267,668, and  $304,049, respectively  at the  end of
1994. The  graph  assumes all  proceeds  of  investment are  reinvested  at  the
respective  index rates at the time of reinvestment and also assumes that 20% of
the assets in each category are turned over annually and proceeds are reinvested
in the respective indexes. The tax rates assumed to generate the after-tax total
returns were based upon the income  and capital gain rates applicable each  year
from  1975-1994 for an investor who earned the inflation-adjusted equivalents of
$400,000 in 1994. In addition, treasury returns were "grossed up" an assumed  5%
to  take into account the Treasuries' exemption from state income tax. The graph
is for  illustrative  purposes  only,  and does  not  represent  the  return  or
performance  of any Nuveen  Tax-Free Unit Trust  and is not  intended to predict
future results.
 
    * The  graph compares  after-tax  total returns  using the  Lehman  Brothers
MuniBond  Index,  Long-Term Treasury  Index and  Long-Term Corporate  Index. The
graph assumes all proceeds of investment are reinvested at the respective  index
rates  at the time  of reinvestment and also  assumes that 20%  of the assets in
each category  are turned  over  annually and  proceeds  are reinvested  in  the
respective  indexes.  The  tax rates  assumed  to generate  the  after-tax total
returns were based upon the income  and capital gain rates applicable each  year
from  1975-1994 for an investor who earned the inflation-adjusted equivalents of
$100,000 in 1994. In addition, treasury returns were "grossed up" an assumed  5%
to  take into account the Treasuries' exemption from state income tax. The graph
is for  illustrative  purposes  only,  and does  not  represent  the  return  or
performance  of any Nuveen  Tax-Free Unit Trust  and is not  intended to predict
future results.
 
    A comparison  of  the  estimated  returns of  the  Trust  and  the  historic
performance  of  municipal  bonds  to  the  returns  and  performance  of  other
investments is  one  element  to  consider  in  making  an  informed  investment
decision.  Taxable investments have investment  characteristics that differ from
those of the Trust.  U.S. Government bonds are  long-term investments backed  by
the  full faith  and credit of  the U.S.  Government and are  subject to federal
income tax  but are  exempt from  state  income taxes.  Bank CDs  are  generally
short-term  FDIC insured investments, which pay fixed principal and interest but
are subject to fluctuating rollover rates. Both bank CDs and corporate bonds are
generally subject to both federal and state income taxes. Money market funds are
short term  investments with  stable net  asset values,  fluctuating yields  and
special features that enhance liquidity.
 
HOW TO CALCULATE YOUR ESTIMATED INCOME
 
    The examples provided below illustrate how to calculate the estimated annual
income  generated by a hypothetical $10,000 investment in each respective Trust.
The illustrations assume that the  investment was made on  the day prior to  the
date  of deposit  by an investor  electing the monthly  distribution plan. These
hypothetical
 
                                       13
<PAGE>
examples are  for illustrative  purposes only  and not  intended to  reflect  or
predict the results of any actual investment.
 
<TABLE>
<S>                              <C>        <C>                              <C>        <C>
EXAMPLE OF HOW TO CALCULATE YOUR ESTIMATED INCOME:
 
    NEW YORK INSURED TRUST 263
 
    $10,000                       DIVIDED  BY $102.26                        =          97.789
    Investment                              Offering price and                          # of units purchased
    (as of 02/04/97)                        accrued interest
 
    97.789                       X          $5.2574                          =          $514.12
    # of units purchased                    Annual income per unit                      annual income
                                            (monthly plan)
</TABLE>
 
<TABLE>
<S>                              <C>        <C>                              <C>        <C>
EXAMPLE OF HOW TO CALCULATE YOUR ESTIMATED INCOME:
 
    OHIO INSURED TRUST 140
 
    $10,000                       DIVIDED  BY $100.86                        =          99.147
    Investment                              Offering price and                          # of units purchased
    (as of 02/04/97)                        accrued interest
 
    99.147                       X          $5.0934                          =          $505.00
    # of units purchased                    Annual income per unit                      annual income
                                            (monthly plan)
</TABLE>
 
                                       14
<PAGE>
                                   APPENDIX A
                              NEW YORK DISCLOSURE
 
ECONOMIC FACTORS--NEW YORK
 
    The  Portfolio of the New York  Insured Trust includes obligations issued by
New York State  (the "State"), by  its various public  bodies (the  "Agencies"),
and/or  by other entities  located within the  State, including the  City of New
York (the "City").
 
    Some of the more significant events and conditions relating to the financial
situation in New York are summarized  below. This section provides only a  brief
summary of the complex factors affecting the financial situation in New York and
is  derived  from  sources that  are  generally  available to  investors  and is
believed to  be  accurate.  It is  based  in  part on  Official  Statements  and
prospectuses issued by, and on other information reported by the State, the City
and the Agencies in connection with the issuance of their respective securities.
 
    There  can  be no  assurance that  current or  future statewide  or regional
economic difficulties, and  the resulting  impact on State  or local  government
finances  generally,  will not  adversely affect  the market  value of  New York
Municipal Obligations  held in  the portfolio  of the  Trust or  the ability  of
particular  obligors to make timely payments of debt service on (or relating to)
those obligations.
 
    (1) THE STATE: The State has historically been one of the wealthiest  states
in  the nation. For  decades, however, the  State economy has  grown more slowly
than that  of the  nation as  a whole,  gradually eroding  the State's  relative
economic  affluence.  Statewide,  urban  centers  have  experienced  significant
changes involving migration of the more affluent to the suburbs and an influx of
generally less affluent residents. Regionally,  the older Northeast cities  have
suffered because of the relative success that the South and the West have had in
attracting  people  and  business.  The  City  has  also  had  to  face  greater
competition  as  other  major  cities  have  developed  financial  and  business
capabilities  which  make  them  less  dependent  on  the  specialized  services
traditionally available almost exclusively in the City.
 
    The State has  for many years  had a very  high state and  local tax  burden
relative to other states. The burden of State and local taxation, in combination
with  the many other causes of regional economic dislocation, has contributed to
the decisions of  some businesses and  individuals to relocate  outside, or  not
locate within, the State.
 
    SLOWDOWN  OF REGIONAL ECONOMY.  A national recession  commenced in mid-1990.
The downturn  continued  throughout the  State's  1990-91 fiscal  year  and  was
followed  by a period of weak economic growth during the 1991 calendar year. For
calendar year 1992,  the national economy  continued to recover,  although at  a
rate  below all  post-war recoveries. For  calendar year 1993,  the economy grew
faster than in 1992,  but still at  a very moderate rate,  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,
 
                                      A-1
<PAGE>
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, 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 in fact negatively  impact
upon  the  City's  finances  by  reducing  tax  receipts.  The  City Comptroller
 
                                      A-2
<PAGE>
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 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
 
                                      A-3
<PAGE>
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  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
 
                                      A-4
<PAGE>
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 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.
 
                                      A-5
<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.
 
                                      A-6
<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 and  state taxes, using  published 1997 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. The
tables assume that federal taxable income and adjusted gross income are equal to
state and city income subject to tax and adjusted gross income, and for cases in
which more than one state rate falls within a Federal bracket, the highest state
rate corresponding to the  highest income within that  Federal bracket is  used.
The  combined state and Federal  tax brackets shown reflect  the fact that state
tax payments are currently  deductible for Federal tax  purposes. The tables  do
not  reflect any local taxes, other than New York City in Chart II, or any taxes
other than personal income taxes. 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-FREE 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- 41.2 $    0-100.00     21.0    %     5.70    6.01    6.33    6.65    6.96    7.28    7.59    7.91
               100.00-121.20     22.0          5.77    6.09    6.41    6.73    7.05    7.37    7.69    8.01
    41.2- 99.6      0-100.00     33.0          6.72    7.09    7.46    7.84    8.21    8.58    8.96    9.33
               100.00-121.20     34.0          6.82    7.20    7.58    7.95    8.33    8.71    9.09    9.47
               121.20-150.00     35.0          6.92    7.31    7.69    8.08    8.46    8.85    9.23    9.62
                150.0-181.80     34.0          6.82    7.20    7.58    7.95    8.33    8.71    9.09    9.47
   99.6-151.75      0-100.00     35.5          6.98    7.36    7.75    8.14    8.53    8.91    9.30    9.69
                100.0-121.20     37.0          7.14    7.54    7.94    8.33    8.73    9.13    9.52    9.92
               121.20-150.00     38.0          7.26    7.66    8.06    8.47    8.87    9.27    9.68   10.08
               150.00-181.80     36.5          7.09    7.48    7.87    8.27    8.66    9.06    9.45    9.84
               181.80-304.30     39.0          7.38    7.79    8.20    8.61    9.02    9.43    9.84   10.25
 151.75-271.05 121.20-150.00     42.5          7.83    8.26    8.70    9.13    9.57   10.00   10.43   10.87
               150.00-181.80     41.5          7.69    8.12    8.55    8.97    9.40    9.83   10.26   10.68
               181.80-304.30     44.5          8.11    8.56    9.01    9.46    9.91   10.36   10.81   11.26
                 Over 304.30     41.5    2     7.69    8.12    8.55    8.97    9.40    9.83   10.26   10.68
   Over 271.05 181.80-304.30     48.0          8.65    9.13    9.62   10.10   10.58   11.06   11.54   12.02
                 Over 304.30     45.0    3     8.18    8.64    9.09    9.55   10.00   10.45   10.91   11.36
</TABLE>
 
  COMBINED MARGINAL TAX RATES FOR SINGLE TAXPAYERS WITH ONE PERSONAL EXEMPTION
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL
    FEDERAL      ADJUSTED      COMBINED
    TAXABLE        GROSS       STATE AND                    TAX-FREE 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- 24.65 $    0-100.00     21.0    %     5.70    6.01    6.33    6.65    6.96    7.28    7.59    7.91
               100.00-121.20     21.5          5.73    6.05    6.37    6.69    7.01    7.32    7.64    7.96
  24.65- 59.75      0-100.00     33.0          6.72    7.09    7.46    7.84    8.21    8.58    8.96    9.33
               100.00-121.20     33.5          6.77    7.14    7.52    7.89    8.27    8.65    9.02    9.40
  59.75-124.65      0-100.00     35.5          6.98    7.36    7.75    8.14    8.53    8.91    9.30    9.69
               100.00-121.20     36.5          7.09    7.48    7.87    8.27    8.66    9.06    9.45    9.84
               121.20-150.00     38.0          7.26    7.66    8.06    8.47    8.87    9.27    9.68   10.08
               150.00-243.70     37.5          7.20    7.60    8.00    8.40    8.80    9.20    9.60   10.00
 124.65-271.05 121.20-150.00     42.5          7.83    8.26    8.70    9.13    9.57   10.00   10.43   10.87
               150.00-243.70     42.0          7.76    8.19    8.62    9.05    9.48    9.91   10.34   10.78
                 Over 243.70     41.5    2     7.69    8.12    8.55    8.97    9.40    9.83   10.26   10.68
   Over 271.05   Over 243.70     45.0    3     8.18    8.64    9.09    9.55   10.00   10.45   10.91   11.36
</TABLE>
 
                                      A-7
<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-FREE ESTIMATED CURRENT RETURN
    INCOME        INCOME      AND 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- 41.2 $    0-100.00     24.0    %     5.92    6.25    6.58    6.91    7.24    7.57    7.89    8.22
               100.00-121.20     25.5          6.04    6.38    6.71    7.05    7.38    7.72    8.05    8.39
    41.2- 99.6      0-100.00     35.5          6.98    7.36    7.75    8.14    8.53    8.91    9.30    9.69
               100.00-121.20     37.0          7.14    7.54    7.94    8.33    8.73    9.13    9.52    9.92
               121.20-150.00     38.0          7.26    7.66    8.06    8.47    8.87    9.27    9.68   10.08
                150.0-181.80     36.5          7.09    7.48    7.87    8.27    8.66    9.06    9.45    9.84
   99.6-151.75      0-100.00     38.5          7.32    7.72    8.13    8.54    8.94    9.35    9.76   10.16
                100.0-121.20     39.5          7.44    7.85    8.26    8.68    9.09    9.50    9.92   10.33
               121.20-150.00     40.5          7.56    7.98    8.40    8.82    9.24    9.66   10.08   10.50
               150.00-181.80     39.5          7.44    7.85    8.26    8.68    9.09    9.50    9.92   10.33
               181.80-304.30     42.0          7.76    8.19    8.62    9.05    9.48    9.91   10.34   10.78
 151.75-271.05 121.20-150.00     45.0          8.18    8.64    9.09    9.55   10.00   10.45   10.91   11.36
               150.00-181.80     44.0          8.04    8.48    8.93    9.38    9.82   10.27   10.71   11.16
               181.80-304.30     46.5          8.41    8.88    9.35    9.81   10.28   10.75   11.21   11.68
                 Over 304.30     44.0    2     8.04    8.48    8.93    9.38    9.82   10.27   10.71   11.16
   Over 271.05 181.80-304.30     50.5          9.09    9.60   10.10   10.61   11.11   11.62   12.12   12.63
                 Over 304.30     47.5    3     8.57    9.05    9.52   10.00   10.48   11.95   11.43   11.90
</TABLE>
 
  COMBINED MARGINAL TAX RATES FOR SINGLE TAXPAYERS WITH ONE PERSONAL EXEMPTION
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL      COMBINED
    FEDERAL      ADJUSTED       STATE,
    TAXABLE        GROSS         LOCAL                      TAX-FREE ESTIMATED CURRENT RETURN
    INCOME        INCOME      AND 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- 24.65 $    0-100.00     24.0    %     5.92    6.25    6.58    6.91    7.24    7.57    7.89    8.22
               100.00-121.20     24.5          5.96    6.29    6.62    6.95    7.28    7.62    7.95    8.28
  24.65- 59.75      0-100.00     35.5          6.98    7.36    7.75    8.14    8.53    8.91    9.30    9.69
               100.00-121.20     36.5          7.09    7.48    7.87    8.27    8.66    9.06    9.45    9.84
  59.75-124.65      0-100.00     38.5          7.32    7.72    8.13    8.54    8.94    9.35    9.76   10.16
               100.00-121.20     39.5          7.44    7.85    8.26    8.68    9.09    9.50    9.92   10.33
               121.20-150.00     40.5          7.56    7.98    8.40    8.82    9.24    9.66   10.08   10.50
               150.00-243.70     40.0          7.50    7.92    8.33    8.75    9.17    9.58   10.00   10.42
 124.65-271.05 121.20-150.00     45.0          8.18    8.64    9.09    9.55   10.00   10.45   10.91   11.36
               150.00-243.70     44.5          8.11    8.56    9.01    9.46    9.91   10.36   10.81   11.26
                 Over 243.70     44.0    2     8.04    8.48    8.93    9.38    9.82   10.27   10.71   11.16
   Over 271.05   Over 243.70     47.5    3     8.57    9.05    9.52   10.00   10.48   10.95   11.43   11.90
</TABLE>
 
- ------------------
 
      1 The table  reflects the effect  of the federal  limitations on  itemized
deductions  (and  the corresponding  state limitations)  and the  deductions 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 combined Federal and state tax rate to approximately 48.09 percent  for
taxpayers  filing a joint return and entitled to four personal exemptions and to
approximately 44.97 percent  for taxpayers  filing a single  return entitled  to
only  one personal exemption  and, in effect raise  the marginal combined State,
New York City and Federal tax rate to approximately 50.32 percent for  taxpayers
filing  a  joint  return  and  entitled  to  four  personal  exemptions  and  to
approximately 47.33 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
Federal  or state 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. Although the table does reflect the effect of the state limitation
on  itemized deductions that corresponds to  the federal limitation, it does not
reflect additional limitations under which a New York taxpayer could lose up  to
an additional 50 percent of his otherwise allowable itemized deductions, because
the  affect of this limitation varies according  to the particular amount of his
itemized deductions. The application  of this limit may  result in a higher  tax
rate  than indicated in the  table for joint taxpayers  with a New York adjusted
gross income  of  $2000,000  to  $250,000 or  $475,000  to  $525,000  or  single
taxpayers  with a  New York  adjusted gross  income of  $100,000 to  $150,000 or
$475,000 to $525,000.  The table  assumes that  a taxpayer's  New York  adjusted
gross  income  equals his  Federal  adjusted gross  income.  The table  does not
reflect the treatment of  various state and city  tax credits that could  affect
the tax rate of particular New York taxpayers.
 
      2 Combined Federal and state tax rate reverts to 40.38% after the 80% caps
on  the limitation on itemized deductions has been met. Combined state, New York
City and Federal tax rate reverts to 42.86% after the 80% cap on the  limitation
on itemized deductions has been met.
 
      3 Combined Federal and state tax rate reverts to 43.74% after the 80% caps
on  the limitation on itemized deductions has been met. Combined state, New York
City and Federal tax rate reverts to 46.08% after the 80% cap on the  limitation
on itemized deductions has been met.
 
                                      A-8
<PAGE>
                                   APPENDIX B
                                OHIO DISCLOSURE
 
ECONOMIC FACTORS--OHIO
 
    As  described above, the  Ohio Trust will  invest most of  its net assets in
securities issued by  or on behalf  of (or in  certificates of participation  in
lease-purchase  obligations of) the State of Ohio, political subdivisions of the
State,  or  agencies  or  instrumentalities  of  the  State  or  its   political
subdivisions  (Ohio  Obligations). The  Ohio Trust  is therefore  susceptible to
general or particular economic, political, or regulatory factors that may affect
issuers of Ohio Obligations. The following information constitutes only a  brief
summary  of  some of  the  many complex  factors that  may  have an  effect. The
information does not apply to "conduit"  obligations on which the public  issuer
itself  has  no  financial  responsibility.  This  information  is  derived from
official statements of certain Ohio  issuers published in connection with  their
issuance  of securities  and from other  publicly available  information, and is
believed to be accurate. No independent verification has been made of any of the
following information.
 
    Generally, the  creditworthiness of  Ohio Obligations  of local  issuers  is
unrelated  to that  of obligations  of the  State itself,  and the  State has no
responsibility to make payments on those local obligations.
 
    There may be specific factors that  at particular times apply in  connection
with  investment  in  particular Ohio  Obligations  or in  those  obligations of
particular Ohio issuers. It is possible that the investment may be in particular
Ohio Obligations, or in those of  particular issuers, as to which those  factors
apply. However, the information below is intended only as a general summary, and
is  not intended  as a discussion  of any  specific factors that  may affect any
particular obligation or issuer.
 
    The timely payment of principal of and interest on Ohio Obligations has been
guaranteed by bond insurance purchased by  the issuers, the Ohio Trust or  other
parties. Those Ohio Obligations may not be subject to the factors referred to in
this section of the Prospectus.
 
    Ohio is the seventh most populous state. The 1990 Census count of 10,847,000
indicated  a 0.5% population increase from 1980. The Census estimate for 1994 is
11,102,000.
 
    While diversifying more into the service and other non-manufacturing  areas,
the  Ohio  economy continues  to  rely in  part  on durable  goods manufacturing
largely concentrated in motor vehicles and equipment, steel, rubber products and
household appliances. As a result, general  economic activity, as in many  other
industrially-developed  states, tends  to be  more cyclical  than in  some other
states and in the nation as a whole. Agriculture is an important segment of  the
economy,  with over half  the State's area devoted  to farming and approximately
16% of total employment in agribusiness.
 
    In prior years, the State's overall unemployment rate was commonly  somewhat
higher  than the national figure. For example, the reported 1990 average monthly
State rate was 5.7%, compared to the 5.5% national figure. However, for the last
five years the State rates  were below the national  rates (4.8% versus 5.6%  in
1995).  The unemployment rate and its effects vary among geographic areas of the
State.
 
    There can  be no  assurance  that future  national, regional  or  state-wide
economic  difficulties, and  the resulting impact  on State  or local government
finances  generally,  will  not  adversely  affect  the  market  value  of  Ohio
Obligations held in the Ohio Trust or the ability of particular obligors to make
timely  payments  of  debt service  on  (or  lease payments  relating  to) those
Obligations.
 
    The State operates on the basis of a fiscal biennium for its  appropriations
and  expenditures, and  is precluded by  law from ending  its July 1  to June 30
fiscal year (FY) or fiscal biennium in a deficit position. Most State operations
are financed through  the General  Revenue Fund  (GRF), for  which the  personal
income  and sales-use taxes are  the major sources. Growth  and depletion of GRF
ending fund  balances show  a consistent  pattern related  to national  economic
conditions,  with  the  ending  FY balance  reduced  during  less  favorable and
increased during more favorable economic periods. The State has well-established
procedures  for,   and   has  timely   taken,   necessary  actions   to   ensure
resource/expenditure  balances  during  less favorable  economic  periods. Those
procedures included general and selected reductions in appropriations spending.
 
    Key biennium-ending fund balances  at June 30, 1989  were $475.1 million  in
the  GRF and  $353 million  in the  Budget Stabilization  Fund (BSF,  a cash and
budgetary management  fund). June  30,  1991 ending  fund balances  were  $135.3
million (GRF) and $300 million (BSF).
 
    The  next  biennium,  1992-93,  presented  significant  challenges  to State
finances, successfully  addressed.  To  allow time  to  resolve  certain  budget
differences,  an interim appropriations act was  enacted effective July 1, 1991;
it included GRF  debt service  and lease  rental appropriations  for the  entire
biennium, while continuing most other
 
                                      B-1
<PAGE>
appropriations  for a month. Pursuant to  the general appropriations act for the
entire biennium, passed on July 11,  1991, $200 million was transfered from  the
BSF to the GRF in FY 1992.
 
    Based  on updated results  and forecasts in  the course of  that FY, both in
light of  a  continuing  uncertain  nationwide  economic  situation,  there  was
projected,  and then timely addressed, an FY 1992 imbalance in GRF resources and
expenditures. In response, the  Governor ordered most  State agencies to  reduce
GRF  spending in the last six months of FY 1992 by a total of approximately $184
million; the  $100.4 million  BSF balance  and additional  amounts from  certain
other  funds were transferred  late in the  FY to the  GRF; and adjustments were
made in the timing of certain tax payments.
 
    A significant GRF shortfall (approximately $520 million) was then  projected
for  FY 1993.  It was  addressed by  appropriate legislative  and administrative
actions, including the Governor's ordering $300 million in selected GRF spending
reductions and subsequent executive and legislative action (a combination of tax
revisions and additional spending reductions). The June 30, 1993 ending GRF fund
balance was  approximately  $111 million,  of  which, as  a  first step  to  BSF
replenishment, $21 million was deposited in the BSF.
 
    None  of the spending  reductions were applied  to appropriations needed for
debt service or lease rentals relating to any State obligations.
 
    The 1994-95 biennium  presented a  more affirmative  financial picture,  and
ended  June 30, 1995  with a GRF ending  fund balance of  $928 million, of which
$535.2 million was transferred into the BSF (which had an August 8, 1996 balance
of over $828 million).
 
    The GRF appropriations act for the  1995-96 biennium was passed on June  28,
1995 and promptly signed (after selective vetoes) by the Governor. All necessary
GRF  appropriations  for  State  debt service  and  lease  rental  payments then
projected for the  biennium were included  in that act.  In accordance with  the
appropriations  act,  the  significant June  30,  1995 GRF  fund  balance, after
leaving in the  GRF an unreserved  and undesignated balance  of $70 million  was
transferred to the BSF and other funds including school assistance funds and, in
anticipation of possible federal program changes, a human services stabilization
fund.
 
    The  State's incurrence or assumption  of debt without a  vote of the people
is,  with  limited  exceptions,  prohibited  by  current  State   constitutional
provisions.  The State may incur  debt, limited in amount  to $750,000, to cover
casual deficits  or failures  in  revenues or  to  meet expenses  not  otherwise
provided  for. The Constitution expressly precludes  the State from assuming the
debts of any  local government  or corporation. (An  exception is  made in  both
cases  for any debt incurred to repel invasion, suppress insurrection, or defend
the State in war.)
 
    By 14 constitutional amendments, the last adopted in 1995, Ohio voters  have
authorized  the incurrence of State  debt and the pledge  of taxes or excises to
its payment. At August  8, 1996, $856 million  (excluding certain highway  bonds
payable  primarily from highway  use charges) of this  debt was outstanding. The
only such State debt at that date still authorized to be incurred were  portions
of  the highway bonds, and the following:  (a) up to $100 million of obligations
for coal research  and development  may be outstanding  at any  one time  ($34.9
million  outstanding); (b) $240 million of obligations previously authorized for
local infrastructure improvements,  no more than  $120 million of  which may  be
issued  in any calendar  year ($774.7 million  outstanding); and (c)  up to $200
million in general obligation bonds  for parks, recreation and natural  resource
purposes  which may be  outstanding at any one  time ($47.2 million outstanding,
with no more than $50 million to be issued in any one year).
 
    The electors approved a November  constitutional amendment that extends  the
local  infrastructure bond  program (authorizing  an additional  $1.2 billion of
State full faith  and credit  obligations to  be issued  over 10  years for  the
purpose),  and  authorizes  additional  highway bonds  (expected  to  be payable
primarily from  highway use  receipts).  The latter  supersedes the  prior  $500
million  highway  obligation authorization,  and authorizes  not more  than $1.2
billion to be  outstanding at  any time  and not more  than $220  million to  be
issued in a fiscal year.
 
    Common  resolutions are pending in both  houses of the General Assembly that
would submit a  constitutional amendment  relating to certain  other aspects  of
State  debt. The proposal  would authorize, among other  things, the issuance of
State general obligation debt  for a variety of  purposes, with debt service  on
all State general obligation debt and GRF-supported obligations not to exceed 5%
of the preceding fiscal year's GRF expenditures.
 
    The  Constitution  also authorizes  the  issuance of  State  obligations for
certain purposes, the owners of which do  not have the right to have excises  or
taxes  levied to pay debt service. Those special obligations include obligations
issued by the Ohio Public Facilities Commission and the Ohio Building Authority,
and certain obligations issued by the State Treasurer over $4.8 billion of which
was outstanding at August 8, 1996.
 
    A 1990  constitutional  amendment  authorizes greater  State  and  political
subdivision participation (including financing) in the provision of housing. The
General   Assembly  may  for  that  purpose  authorize  the  issuance  of  State
 
                                      B-2
<PAGE>
obligations secured by a pledge of all or such portion as it authorizes of State
revenues or receipts (but not by a pledge of the State's full faith and credit).
 
    A 1994 constitutional amendment pledges the full faith and credit and taxing
power of  the State  to meeting  certain guarantees  under the  State's  tuition
credit  program which provides for purchase  of tuition credits, for the benefit
of State residents, guaranteed to cover  a specified amount when applied to  the
cost  of  higher  education  tuition.  (A  1965  constitutional  provision  that
authorized student loan guarantees payable from available State moneys has never
been implemented, apart from a "guarantee fund" approach funded essentially from
program revenues.)
 
    The House  has adopted  a resolution  that would  submit to  the electors  a
constitutional  amendment prohibiting the  General Assembly from  imposing a new
tax or increasing an existing tax unless approved by a three-fifths vote of each
house or  by a  majority  vote of  the electors.  The  deadline has  passed  for
submission of constitutional amendments at the November 1996 election.
 
    State  and local agencies  issue obligations that  are payable from revenues
from or  relating  to certain  facilities  (but  not from  taxes).  By  judicial
interpretation,   these  obligations   are  not   "debt"  within  constitutional
provisions. In general, payment  obligations under lease-purchase agreements  of
Ohio  public agencies (in which certificates of participation may be issued) are
limited in duration to the agency's  fiscal period, and are renewable only  upon
appropriations being made available for the subsequent fiscal period.
 
    Local school districts in Ohio receive a major portion (state-wide aggregate
approximately  44%  in  recent  years)  of  their  operating  moneys  from State
subsidies, but are dependent on local property taxes, and in 120 districts  from
voter-authorized  income  taxes,  for  significant  portions  of  their budgets.
Litigation, similar  to  that  in  other  states,  is  pending  questioning  the
constitutionality  of Ohio's system of school funding. The trial court concluded
that  aspects  of  the  system   (including  basic  operating  assistance)   are
unconstitutional,  and  ordered  the State  to  provide  for and  fund  a system
complying with the Ohio Constitution. The State appealed and a court of  appeals
reversed  the trial  court's findings for  plaintiff districts. The  case is now
pending on appeal in the Ohio Supreme  Court. A small number of the State's  612
local  school districts  have in any  year required special  assistance to avoid
year-end deficits.  A current  program provides  for school  district cash  need
borrowing  directly  from commercial  lenders, with  diversion of  State subsidy
distributions to  repayment  if needed.  Recent  borrowings under  this  program
totalled  $94.5 million for 27  districts (including $75 million  for one) in FY
1993, $41.1 million for 28 districts in FY 1994, $71.1 million for 29  districts
in FY 1995 (including $29.5 million for one), and $87.2 million for 20 districts
in FY 1996 (including $42.1 million for one).
 
    Ohio's  943 incorporated cities and villages  rely primarily on property and
municipal income taxes for their operations. With other subdivisions, they  also
receive  local government support and property  tax relief moneys distributed by
the State. For those few municipalities that on occasion have faced  significant
financial  problems,  there are  statutory  procedures for  a  joint State/local
commission to monitor the municipality's fiscal affairs and for development of a
financial plan to eliminate deficits and  cure any defaults. Since inception  in
1979,  these procedures have been  applied to 23 cities  and villages; for 19 of
them the fiscal situation was resolved and the procedures terminated.
 
    At present  the State  itself does  not levy  ad valorem  taxes on  real  or
tangible personal property. Those taxes are levied by political subdivisions and
other  local taxing districts. The Constitution has  since 1934 limited to 1% of
true value in  money the  amount of  the aggregate  levy (including  a levy  for
unvoted  general obligations) of property taxes by all overlapping subdivisions,
without a vote of  the electors or a  municipal charter provision, and  statutes
limit the amount of that aggregate levy to 10 mills per $1 of assessed valuation
(commonly  referred to as the  "ten-mill limitation"). Voted general obligations
of subdivisions are payable from property taxes that are unlimited as to  amount
or rate.
 
OHIO 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 1997 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.  The
table  assumes that federal taxable  income is equal to  state income subject to
tax, and for  cases in which  more than one  state rate falls  within a  Federal
bracket,  the state rate corresponding to the highest income within that Federal
bracket is used. The combined state  and Federal tax brackets shown reflect  the
fact  that state tax payments are currently deductible for Federal tax purposes.
The tables do  not reflect  any local  taxes or  any taxes  other than  personal
income  taxes. 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
 
                                      B-3
<PAGE>
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-FREE 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- 41.2 $    0-121.20      18.5   %     5.52    5.83    6.13    6.44    6.75    7.06    7.36    7.67
    41.2- 99.6      0-121.20      32.0         6.62    6.99    7.35    7.72    8.09    8.46    8.82    9.19
               121.20-181.80      33.0         6.72    7.09    7.46    7.84    8.21    8.58    8.96    9.33
   99.6-151.75      0-121.20      35.5         6.98    7.36    7.75    8.14    8.53    8.91    9.30    9.69
               121.20-181.80      36.5         7.09    7.48    7.87    8.27    8.66    9.06    9.45    9.84
               181.80-304.30      38.5         7.32    7.72    8.13    8.54    8.94    9.35    9.76   10.16
 151.75-271.05 121.20-181.80      41.5         7.69    8.12    8.55    8.97    9.40    9.83   10.26   10.68
               181.80-304.30      44.0         8.04    8.48    8.93    9.38    9.82   10.27   10.71   11.16
                 Over 304.30      41.5   2     7.69    8.12    8.55    8.97    9.40    9.83   10.26   10.68
   Over 271.05 181.80-304.30      48.5         8.74    9.22    9.71   10.19   10.68   11.17   11.65   12.14
                 Over 304.30      45.0   3     8.18    8.64    9.09    9.55   10.00   10.45   10.91   11.36
</TABLE>
 
  COMBINED MARGINAL TAX RATES FOR SINGLE TAXPAYERS WITH ONE PERSONAL EXEMPTION
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL
    FEDERAL      ADJUSTED      COMBINED
    TAXABLE        GROSS       STATE AND                    TAX-FREE 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- 24.65 $    0-121.20      18.5   %     5.52    5.83    6.13    6.44    6.75    7.06    7.36    7.67
  24.65- 59.75      0-121.20      31.5         6.57    6.93    7.30    7.66    8.03    8.39    8.76    9.12
  59.75-124.65      0-121.20      35.5         6.98    7.36    7.75    8.14    8.53    8.91    9.30    9.69
               121.20-243.70      37.0         7.14    7.54    7.94    8.33    8.73    9.13    9.52    9.92
 124.65-271.05 121.20-243.70      42.0         7.76    8.19    8.62    9.05    9.48    9.91   10.34   10.78
                 Over 243.70      41.5   2     7.69    8.12    8.55    8.97    9.40    9.83   10.26   10.68
   Over 271.05   Over 243.70      45.0   3     8.18    8.64    9.09    9.55   10.00   10.45   10.91   11.36
</TABLE>
 
- ------------------
 
      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 combined Federal  and
state  tax  rate to  approximately 48.34  percent for  taxpayers filing  a joint
return and  entitled to  four  personal exemptions  and to  approximately  45.23
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 does not  reflect the Ohio  joint filing credit,
which has the effect of reducing the state tax rates by 5% to 20% of such  rates
for  certain married taxpayers filing a joint  return. The amount of this credit
cannot exceed $650.00.
 
      2 Combined Federal and state tax rate  reverts to 40.8% after the 80%  cap
on the limitation on itemized deductions has been met.
 
      3  Combined Federal and state tax rate reverts to 44.13% after the 80% cap
on the limitation on itemized deductions has been met.
 
                                      B-4
<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)   In the  printed document, footnote  symbols may include  a "dagger" or
multiple "dagger". The  "dagger" symbol is  represented as #  in the  electronic
document.
 
    (3)  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:
 
<TABLE>
<S>                                                                       <C>
    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
</TABLE>
 
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
 
C.  EXPLANATORY NOTE:
 
    This Amendment  No.  1  to  the  Registration  Statement  contains  multiple
separate  prospectuses.  Each  prospectus  will  relate  to  an  individual unit
investment trust and  will consist  of a  Part A, a  Part B  and an  Information
Supplement.  Each  prospectus  will  be  identical  will  the  exception  of the
respective Part A which will contain the financial information specific to  such
underlying unit investment trust.
 
D.  UNDERTAKINGS:
 
    1.   With the  exception of the  information included in  the state specific
appendices to the  Information Supplement,  which will vary  depending upon  the
make-up  of a  Fund or  updated to  reflect current  events, any  amendment to a
Fund's Information Supplement will be subject to the review of the staff of  the
Securities and Exchange Commission prior to distribution; and
 
    2.   The Information  Supplement to the  Trust will not  include third party
financial information.
 
                                      S-1
<PAGE>
                                   SIGNATURES
 
   
    The Registrant, Nuveen  Tax-Free Unit  Trust, Series  917 hereby  identifies
Series  401, 507, 512, 515, 517, 519, 723,  814 and 823 of the Nuveen Tax-Exempt
Unit Trust (the former name of the  Nuveen Tax-Free 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-Free  Unit  Trust, Series  917  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 February  5,
1997.
    
 
   
                                          NUVEEN TAX-FREE UNIT TRUST, SERIES 917
                                                             (Registrant)
    
 
                                          By JOHN NUVEEN & CO. INCORPORATED
                                                             (Depositor)
 
                                          By:  Anna R. Kucinskis
                                          --------------------------------------
                                                             Vice President
 
                                          Attest:  Morrison C. Warren
                                          --------------------------------------
                                                             Assistant Secretary
 
                                      S-2
<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:
 
   
<TABLE>
<CAPTION>
          SIGNATURE                        TITLE*                 DATE
<S>                            <C>                              <C>        <C>
Timothy T. Schwertfeger        Chairman, Board of Directors         )
                               Chief Executive Officer and          )
                               Director                             )
                                                                    )
Anthony T. Dean                President, Chief Operating           )
                               Officer and Director                 )           Larry Woods Martin
                                                                    )           Attorney-In-Fact**
                                                                    )
John P. Amboian                Chief Financial Officer and          )            February 5, 1997
                               Executive Vice President             )
                                                                    )
                                                                    )
O. Walter Renfftlen            Vice President and Controller        )
                               (Principal Accounting Officer)       )
                                                                    )
                                                                    )
</TABLE>
    
 
- --------------
 
*  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. Renfftlen, Dean  and
Schwertfeger  with the  Amendment to the  Registration Statement on  Form S-6 of
Nuveen Tax-Free  Unit  Trust, Series  671  (File  No. 33-49175).  The  Power  of
Attorney  for Messr.  Amboian was filed  with the Amendment  to the Registration
statement on  Form S-6  of Nuveen  Tax-Free  Unit Trust,  Series 823  (File  No.
33-62325).
 
                                      S-3
<PAGE>
   
917
    
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
    The  consent of Arthur Andersen 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.
 
                                      S-4
<PAGE>
                                LIST OF EXHIBITS
 
<TABLE>
<S>         <C>
1.1(a)      Copy of Standard Terms and Conditions of Trust between John Nuveen & Co.  Incorporated,
            Depositor,  and The Chase Manhattan  Bank, Trustee (as Exibit  1.1 (a) to the Sponsor's
            Registration Statement  on Form  S-6  relating to  Series 823  of  the Fund  (file  No.
            33-62325) and incorporated herein by reference).
1.1(b)      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 Andersen LLP
6.1         List of Directors and Officers of Depositor and other related information (incorporated
            by reference to Form S-6  [File No. 33-62325] filed on  September 7, 1995 on behalf  of
            Nuveen Tax-Free Unit Trust, Series 823).
</TABLE>
 
                                      S-5

<PAGE>
   
EXHIBIT 1.1(B)
NUVEEN TAX-FREE UNIT TRUST SERIES 917
TRUST INDENTURE AND AGREEMENT
DATED FEBRUARY 5, 1997
    
 
    This  Trust  Indenture  and  Agreement  by and  between  John  Nuveen  & Co.
Incorporated, as Depositor and The Chase Manhattan Bank, as Trustee, sets  forth
certain provisions in full and incorporates other provisions by reference to the
document  entitled 'Standard Terms  and Conditions of  Trust for Nuveen Tax-Free
Unit Trust  Series  823 and  subsequent  Series, effective  September  7,  1995'
(herein  called  the  'Standard  Terms  and  Conditions  of  Trust'),  and  such
provisions as are set forth in full  and such provisions as are incorporated  by
reference  constitute a single instrument. All references herein to Articles and
Sections are to Articles  and Sections of the  Standard Terms and Conditions  of
Trust.
 
    Witnesseth That:
 
    In  consideration  of  the  promises and  of  the  mutual  agreements herein
contained, the Depositor and the Trustee, agree as follows:
 
PART I
 
    Standard Terms and Conditions of Trust Subject to the Provisions of Part  II
hereof,  all the  provisions contained in  the Standard Terms  and Conditions of
Trust are herein incorporated by reference in their entirety and shall be deemed
to be a part of this instrument as  fully and to the same extent as though  said
provisions had been set forth in full in this instrument.
 
PART II
 
    Special  Terms  and  Conditions of  Trust  The following  special  terms and
conditions are hereby agreed to:
 
    (a)  The Bonds defined in Section  1.01(1) listed in Schedule A hereto  have
been deposited in trust under this Trust Indenture and Agreement.
 
    (b)   The fractional undivided  interest in and ownership  of the Trust Fund
represented by each  Unit for  a Trust  on the Initial  Date of  Deposit is  the
amount  set  forth  under  the  captions  "Essential  Information  -- Fractional
Undivided Interest in the Trust per Unit" in the Prospectus.
 
    (c)  The number of  Units created of each Trust  are as set forth under  the
caption  "Essential Information --  Number of Units" in  the Prospectus for each
Trust.
 
    (d)  Notwithstanding  anything to  the contrary  in the  Standard Terms  and
Conditions  of Trust, the phrase "Nuveen  Tax-Exempt Unit Trust" shall be hereby
replaced with the phrase "Nuveen Tax-Free Unit Trust."
<PAGE>
   
    In Witness Whereof, John  Nuveen & Co. Incorporated,  has caused this  Trust
Indenture and Agreement for Nuveen Tax-Free Unit Trust Series 917 to be executed
by  its  President, one  of its  Vice Presidents  or one  of its  Assistant Vice
Presidents and  its corporate  seal to  be hereto  affixed and  attested by  its
Secretary  or its  Assistant Secretary and  The Chase Manhattan  Bank has caused
this Trust Indenture and Agreement to be executed by one of its Vice  Presidents
or  Second  Vice Presidents  and its  corporate  seal to  be hereto  affixed and
attested to by one  of its Assistant  Treasurers; all as of  the day, month  and
year first above written.
    
 
John Nuveen & Co. Incorporated,
Depositor
By Larry Woods Martin
Authorized Officer
(Seal)
Attest:
By Morrison C. Warren
                   Assistant Secretary
 
The Chase Manhattan Bank, Trustee
By Timothy Kelley
Second Vice President
(Seal)
Attest:
By Joseph Lyons
                   Assistant Treasurer
 
   
Schedule A to the Trust Indenture and Agreement Securities Initially Deposited
in Nuveen Tax-Free Unit Trust Series 917
    
 
(Note:  Incorporated herein and made a part hereof is the "Schedule of
Investments" as set forth for each Trust in the Prospectus.)

<PAGE>
EXHIBIT 3.1
 
(ON CHAPMAN AND CUTLER LETTERHEAD)
 
   
February 5, 1997
    
 
John Nuveen & Co. Incorporated
333 W. Wacker Drive
Chicago, Illinois 60606
 
   
RE:  Nuveen Tax-Free Unit Trust, Series 917
    
 
Gentlemen:
 
   
    We  have served  as counsel  for you, as  depositor of  Nuveen Tax-Free Unit
Trust, Series 917 (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 The Chase  Manhattan
Bank,  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.  333-19723) 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 ANDERSEN LLP
 
Chicago, Illinois
 
   
February 5, 1997
    

<PAGE>
EXHIBIT 4.2
 
(On J. J. Kenny Co., Inc. Letterhead)
 
   
February 5, 1997
    
 
John Nuveen & Company
333 West Wacker Drive
Chicago, IL 60606
 
   
Re:  Nuveen Tax Free Unit Trust, Series 917
    
 
Gentlemen:
 
   
    We  have  examined the  registration statement  File  No. 333-19723  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)
 
   
February 5, 1997
    
 
John Nuveen & Co. Incorporated
333 W. Wacker Drive
Chicago, IL 60606
 
   
RE:--Nuveen Tax-Free Unit Trust, Series 917
    
 
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 # 333-19723.
    
 
    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.
 
    Standard  &  Poor's will  maintain surveillance  on  the "AAA"  rating until
thirteen months from the initial Date of  Deposit. On this date the rating  will
be  automatically withdrawn by Standard &  Poor's unless a post effective letter
is requested by the 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)
 
   
February 5, 1997
    
 
John Nuveen & Co. Incorporated
333 W. Wacker Drive
Chicago, Illinois 60606
 
   
RE:  Nuveen Tax-Free Unit Trust, Series 917
    
 
Gentlemen:
 
   
    We  have served  as counsel  for you, as  Depositor of  Nuveen Tax-Free Unit
Trust, Series 917 (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 The Chase  Manhattan Bank, 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-Free 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-Free Unit
Trust, Series 917.
    
 
    We have concluded that  the Trust Indenture and  Agreement for the Fund  and
its counterpart in each of the prior issues of Nuveen Tax-Free 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)  Each of the Trusts will not be an association taxable as a  corporation
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 of the  Trust in the
proportion described and an item of Trust income will have the same character in
the hands  of a  Unitholder  as it  would  have in  the  hands of  the  Trustee.
Accordingly,  to the extent that the income  of 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  with respect  to his  Units attributable  to such  industrial
development  bonds or  such private  activity bonds  is includable  in his gross
income. To the extent the Trust holds bonds that are "specified private activity
bonds" within the meaning  of Section 57(a)(5) of  the Code, a Unitholder's  pro
rate  portion of the  income of such  Bonds will be  included as an  item of tax
preference in  the  computation  of  the  alternative  minimum  tax  applied  to
taxpayers (including non-corporate taxpayers) subject to the alternative minimum
tax.  In the case of certain corporations,  interest on the Bonds is included in
computing the alternative minimum  tax pursuant to Sections  56(c) 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 respect  to
U.S. branches of foreign corporations.
 
    (iii)   Gain or loss  will be recognized to  a Unitholder upon redemption or
sale of his  Units. Unitholders  must reduce  the tax  basis of  their share  of
accrued  interest received by  the Trust, if  any, on Bonds  delivered after the
Unitholders pay for their Units to the extent that such interest accrued on such
Bonds before the date the Trust acquired ownership of the Bonds (and the  amount
of  this reduction may exceed the amount of accrued interest paid to the seller)
and, consequently, such  Unitholders may  have an  increase in  taxable gain  or
reduction  in capital loss upon the disposition of such Units. Such gain or loss
is  measured  by  comparing  the  proceeds  of  such  redemption  or  sale  with
<PAGE>
the  adjusted basis of such Units. In  addition, such basis will be increased by
both the Unitholder's aliquot share of the accrued original issue discount  (and
market  discount, if the Unitholder elects  to include market discount in income
as it accrues) with respect to each Bond held by the Trust with respect to which
there was original issue discount at the time the Bond was issued (or which  was
purchased  with market discount) and reduced  by the annual amortization of bond
premium, if any, on Bonds held by the Trust.
 
    (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 accrued interest  received by the Trust, if
any, on Bonds delivered after the Unitholders pay for their Units to the  extent
that  such interest  accrued on  the Bonds  before the  date the  Trust acquired
ownership of the Bonds (and the amount  of this reduction may exceed the  amount
of  accrued  interest  paid  to  the seller),  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 (and
market discount, if the Unitholder elects  to include market discount in  income
as it accrues) with respect to each Bond which, at the time the Bond was issued,
had original issue discount (or which was purchased with market 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 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 Bonds 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 in normal course of business by the respective issuer of  the
defaulted  Bonds, 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.
 
    Because the Trusts do  not include any "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) for tax years beginning in 1989 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 operating  loss
deduction).  "Adjusted  current  earnings"  includes  all  tax-exempt  interest,
including interest on  all Bonds  in the  Trust, and  tax-exempt original  issue
discount.  Under  current  code provisions,  the  Superfund Tax  does  not apply
<PAGE>
to tax years beginning on or after  January 1, 1996. However, the Superfund  Tax
could be extended retroactively.
 
    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.
 
    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 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
(with certain exceptions), 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.  On
December  7,  1995 the  U.S. Treasury  Department released  proposed legislation
that, if adopted, would generally extend the financial institution rules to  all
corporations, effective for obligations acquired after the date of announcement.
 
    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 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 have not examined any of the Bonds to be deposited and held in the  Trust
or the proceedings for the issuance thereof or the opinions of bond counsel with
respect thereto, and therefore express no opinion as to the exemption from State
income taxed of interest on the Bonds if received directly be a Unitholder.
 
   
    We  hereby  consent to  the  filing of  this opinion  as  an exhibit  to the
Registration Statement (File No.  333-19723) 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,
<PAGE>
CHAPMAN AND CUTLER

<PAGE>
EXHIBIT 3.3
 
(ON EDWARDS & ANGELL LETTERHEAD)
 
   
FEBRUARY 5, 1997
    
 
   
Nuveen Tax-Free Unit Trust,
Series 917
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
 
   
The Chase Manhattan Bank,
as Trustee of Nuveen Tax-Free Unit Trust,
Series 917
4 New York Plaza, 3rd Floor
New York, NY 10004-2413
    
 
Re:--New York Insured Trust 263
 
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-Free Unit Trust, Series 917 (the "Fund") concerning a Registration Statement
(No.  333-19723) 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;
<PAGE>
    (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;
 
    (C)--A  Unitholder who is  a resident of  New York State  (or New York City)
will be subject to New  York State (or New York  City) personal income tax  with
respect  to gains realized when Obligations  held in the Unitholder's respective
New York Trust are sold, redeemed or  paid at maturity or when the  Unitholder's
Units  are  sold  or  redeemed;  such gain  will  equal  the  proceeds  of sale,
redemption or payment less the tax basis of the Obligation or Unit (adjusted  to
reflect (a) the amortization of premium or discount (if any) on Obligations held
by  the New York Trust, (b) accrued original issue discount with respect to each
Obligation which, at  the time  the Obligation  was issued,  had original  issue
discount,  and (c) the deposit  of Obligations with accrued  interest in the New
York Trust after the Unitholder's settlement date);
 
    (D)--Interest or gain from a New York  Trust derived by a Unitholder who  is
not  a resident of New York State (or New  York City) will not be subject to New
York State (or New York City) personal income tax, unless the Units are property
employed in a business, trade, profession  or occupation carried on in New  York
State (or New York City);
 
    (E)--In  the  case of  a New  York  Insured Trust  or New  York Intermediate
Insured Trust, amounts paid under the Policies representing maturing interest on
defaulted Obligations held by the Trustee  in the Trust will be excludable  from
New  York State and  New York City  income if, and  to the same  extent as, such
interest would have been excludable if paid by the respective issuer; and
 
    (F)--Amounts distributable from a  New York Trust which  are, pursuant to  a
Unitholder's  election, automatically reinvested in  Nuveen Municipal Bond Fund,
Inc. will  be treated  as if  actually  distributed to  and reinvested  by  such
Unitholder.
 
    Because  of the requirement that tax cost  basis be adjusted as discussed in
(C) above, under some circumstances a  Unitholder may realize taxable gain  when
his  Units are sold or redeemed for an amount equal to or less than his original
cost.
 
    Although interest  on  Obligations  issued  by  New  York  (or  a  political
subdivision  thereof) would generally be exempt from New York State and New York
City tax, a special limitation may apply with respect to private activity  bonds
which  are not qualified  bonds within the  meaning of section  103(b)(1) of the
Internal Revenue Code of 1986,  as amended. The interest  on such bonds, to  the
extent  received by a Unitholder who is  a "substantial user" (or person related
to such user) of the facilities financed by such bonds, will not be exempt  from
New  York State and New York City tax for any period during which such bonds are
beneficially held by such "substantial user" or "related person".
 
    As an additional matter, if borrowed funds  are used to purchase Units in  a
New  York Trust, all (or part) of the  interest on such indebtedness will not be
deductible for New York State  and New York City  tax purposes. The purchase  of
Units  may be considered to have been  made with borrowed funds even though such
funds are not directly traceable to the purchase of Units in any New York Trust.
 
    We are further of the opinion that,  for purposes of the New York State  and
New  York City franchise  tax on corporations, Unitholders  which are subject to
such tax will be required to include in their entire net income any interest  or
gains  distributed to them in  respect of obligations of  any state or political
subdivision  thereof,  including  New  York.  No  opinion  is  rendered  on  the
includability  in entire net income of  interest distributed to such Unitholders
in respect of obligations issued by  Puerto Rico, the Virgin Islands, Guam,  the
Northern  Mariana Islands or  other possessions of the  United States within the
meaning of Section 103(c) of the Internal Revenue Code of 1986, as amended.
 
    The foregoing opinions  are based  upon present provisions  of Federal,  New
York  State and  New York City  law, administrative  interpretations thereof and
court decisions.
 
    In  connection  with  this  offering,  we  have  not  examined  any  of  the
obligations  to be deposited  in the New  York Trust(s), and  express no opinion
whether the interest on any such  obligations is, in fact, exempt from  Federal,
New York State, or New York City income taxation, or that such interest would be
tax-exempt  under Federal,  New York  State, or  New York  City law  if directly
received by  a  Unitholder, nor  have  we made  any  review of  the  proceedings
relating to the issuance of any such obligations.
 
    We  hereby  consent to  the  filing of  this opinion  as  an exhibit  to the
Registration Statement and  to the reference  to our firm  in such  Registration
Statement and the Prospectus included therein.
 
Very truly yours,
 
EDWARDS & ANGELL

<PAGE>
EXHIBIT 3.3
 
(ON SQUIRE, SANDERS & DEMPSEY LETTERHEAD)
 
   
FEBRUARY 5, 1997
    
 
John Nuveen & Co. Incorporated
333 West Wacker Drive
Chicago, Illinois 60606
 
The Chase Manhattan Bank
Nuveen Administration Department
4 New York Plaza - 3rd Floor
New York, New York 10004-2413
 
   
RE:  Nuveen Tax-Free Unit Trust, Series 917
     Ohio Insured Trust 140
    
 
Gentlemen:
 
   
    You  have requested  our opinion as  to the  Ohio tax aspects  of the above-
captioned Trust(s)  (the "Ohio  Trust(s)"),  which is(are)  part of  the  Nuveen
Tax-Free  Unit Trust -- Series 917 (the  "Fund"). We understand that the Fund is
organized under  the  Trust Indenture  and  Agreement, dated  the  date  hereof,
between  John Nuveen &  Co. Incorporated, as Depositor,  and The Chase Manhattan
Bank, as Trustee. We further  understand that (i) the  Fund will issue Units  of
fractional  undivided  interests in  several  state trusts,  including  the Ohio
Trust(s), (ii) the Units will be purchased by various investors ("Unitholders"),
(iii) each Unit of the Ohio Trust(s) represents a fractional undivided  interest
in  the principal and net income of the  Ohio Trust(s) in the ratio of ten Units
for each $1,000 of principal amount of the obligations initially acquired by the
Ohio Trust(s), and  (iv) each  state trust will  be administered  as a  distinct
entity with separate certificates, investments, expenses, books and records.
    
 
    In  addition, we  understand that  (i) the  Ohio Trust(s)  is(are) comprised
primarily of interest-bearing obligations issued by or on behalf of the State of
Ohio, political subdivisions thereof,  or agencies or instrumentalities  thereof
("Ohio  Obligations"), or by the governments of Puerto Rico, the Virgin Islands,
the Northern Mariana Islands or Guam ("Territorial Obligations")  (collectively,
"Obligations"),  (ii) at all times at least fifty percent of the total assets of
the Ohio Trust(s) will  consist of Ohio Obligations,  or similar obligations  of
other states or their subdivisions, and (iii) distributions of interest received
by  the Ohio  Trust(s) will be  made semi-annually unless  the Unitholder elects
otherwise. We further understand that, based on the opinion of bond counsel with
respect to each issue of Ohio Obligations held or to be held by the Ohio  Trust,
rendered  on  the date  of  issuance thereof,  interest  on each  such  issue is
excluded from gross income for federal income tax purposes under Section  103(a)
of  the Internal Revenue Code of 1986,  as amended ("Code"), or other provisions
of federal  law, provided  that with  respect to  certain Ohio  and  Territorial
Obligations,  certain  representations are  accurate  and certain  covenants are
satisfied.
 
    We understand  that Chapman  and Cutler  has rendered  an opinion  that  for
federal  income  tax purposes  the Ohio  Trust(s)  will not  be taxable  as (an)
association(s) but will be governed by the provisions of subchapter J  (relating
to  trusts) of  Chapter 1 of  the Code;  each Unitholder will  be considered the
owner of a  pro rata  portion of the  Unitholder's respective  Ohio Trust  under
Section  676(a) of the  Code; the Ohio  Trust(s) will not  be subject to federal
income tax; each  Unitholder will be  considered to have  received his pro  rata
share  of interest on  the underlying bonds in  the Unitholder's respective Ohio
Trust when it is received  by such Ohio Trust; and  each Unitholder will have  a
taxable  event  when  the  Unitholder's respective  Ohio  Trust  disposes  of an
underlying obligation  (whether by  sale, exchange,  redemption, or  payment  at
maturity) or when the Unitholder redeems or sells his Units.
 
    Based  on the foregoing and upon an  examination of such other documents and
an investigation of such other  matters of law as  we have deemed necessary,  we
are of the opinion that under existing Ohio law:
 
    1.--The Ohio Trust(s) is(are) not taxable as (a) corporation(s) or otherwise
for purposes of the Ohio personal income tax, Ohio school district income taxes,
the Ohio corporation franchise tax, or the Ohio dealers in intangibles tax.
 
    2.--Income  of  the Ohio  Trust(s)  will be  treated  as the  income  of the
Unitholders for  purposes of  the Ohio  personal income  tax and  municipal  and
school  district income taxes in Ohio and  the Ohio corporation franchise tax in
proportion to the respective interest therein of each Unitholder.
<PAGE>
    3.--Interest on Obligations  held by the  Ohio Trust(s) is  exempt from  the
Ohio  personal income  tax, and  municipal and  school district  income taxes in
Ohio, and is excluded from the net income base of the Ohio corporation franchise
tax when distributed or deemed distributed to Unitholders.
 
    4.--Proceeds paid under insurance  policies, if any, to  the Trustee of  the
Ohio  Trust(s) representing maturing  interest on defaulted  obligations held by
the Ohio Trust(s)  that is  excluded from gross  income for  federal income  tax
purposes  will be  exempt from  the Ohio personal  income tax  and municipal and
school district  income taxes  in  Ohio and  the net  income  base of  the  Ohio
corporation franchise tax.
 
    5.--Gains  and losses realized on the sale, exchange or other disposition by
the Ohio Trust(s) of Ohio Obligations are excluded in determining adjusted gross
and taxable income for purposes of  the Ohio personal income tax, and  municipal
and  school district income taxes in Ohio,  and are excluded from the net income
base  of  the  Ohio  corporation  franchise  tax  when  distributed  or   deemed
distributed to Unitholders.
 
    We  have not  examined any of  the obligations  to be deposited  in the Ohio
Trust(s) and  express  no  opinion  as to  whether  such  obligations,  interest
thereon,  or gain from  the sale or  other disposition thereof  would in fact be
exempt from any federal  or Ohio taxes  if such obligations  were held, or  such
interest or gain were received, directly by the Unitholders.
 
   
    We  hereby  consent to  the  filing of  this opinion  as  an exhibit  to the
Registration Statement (No. 333-19723) relating to the Units referred to  above,
and  to  the  reference  to  our  firm  as  special  Ohio  tax  counsel  in said
Registration Statement and in the Prospectus contained therein.
    
 
Respectfully submitted,
 
SQUIRE, SANDERS & DEMPSEY

<PAGE>
EXHIBIT 4.3
 
(ON CARTER LEDYARD & MILBURN LETTERHEAD)
 
   
February 5, 1997
    
 
   
Nuveen Tax-Free Unit Trust, Series 917
c/o John Nuveen & Co. Incorporated,
as Depositor of Nuveen Tax-Free Unit
Trust, Series 917
333 W. Wacker Drive
Chicago, Illinois 60606
    
 
   
RE:  Nuveen Tax-Free Unit Trust, Series 917
    
 
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-Free Unit Trust,  Series 917 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

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the New York
Insured Trust 263 which is incorporated in the Prospectus dated February 5, 1997
and is qualified in its entirety by reference to such prospectus.
</LEGEND>
<SERIES>
<NUMBER>                     001
<NAME>                        New York Insured
 
       
<S>                                                <C>
<PERIOD-TYPE>                                      OTHER
<FISCAL-YEAR-END>                                               JAN-31-1998
<PERIOD-END>                                                    JAN-31-1998
<INVESTMENTS-AT-COST>                                             3,385,961
<INVESTMENTS-AT-VALUE>                                            3,401,368
<RECEIVABLES>                                                        18,590
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    3,425,358
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            18,590
<TOTAL-LIABILITIES>                                                  18,590
<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>                                                      3,401,368
<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>                                                 97.18
<PER-SHARE-NII>                                                           0
<PER-SHARE-GAIN-APPREC>                                                   0
<PER-SHARE-DIVIDEND>                                                      0
<PER-SHARE-DISTRIBUTIONS>                                                 0
<RETURNS-OF-CAPITAL>                                                      0
<PER-SHARE-NAV-END>                                                       0
<EXPENSE-RATIO>                                                           0
<AVG-DEBT-OUTSTANDING>                                                    0
<AVG-DEBT-PER-SHARE>                                                      0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<LEGEND>
This  schedule contains  summary financial  information extracted  from the Ohio
Insured Trust 140 which is incorporated in the Prospectus dated February 5, 1997
and is qualified in its entirety by reference to such prospectus.
</LEGEND>
<SERIES>
<NUMBER>                     002
<NAME>                        Ohio Insured
 
       
<S>                                                <C>
<PERIOD-TYPE>                                      OTHER
<FISCAL-YEAR-END>                                               JAN-31-1998
<PERIOD-END>                                                    JAN-31-1998
<INVESTMENTS-AT-COST>                                             3,336,548
<INVESTMENTS-AT-VALUE>                                            3,354,914
<RECEIVABLES>                                                        49,287
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    3,409,301
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            49,287
<TOTAL-LIABILITIES>                                                  49,287
<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>                                                      3,354,914
<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>                                                 95.85
<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-FREE UNIT TRUST, SERIES 917
                           FILE NO. 333-19723
    
 
   
    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 February 5,
1997,  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
 
    PART A-PAGE  2.--The "Estimated  Long-Term  Return" and  "Estimated  Current
Return" to Unitholders under each Trust under each of the distribution plans are
stated.
 
    PART A-PAGES 1 - 2.--Essential information for each of the Trusts, including
applicable footnotes, has been completed for this Series.
 
    PART  A-PAGES 1 - 2.--The date of the Indenture has been inserted in Section
1 along with the size and number of Units of each of the Trusts.
 
    PART A-PAGES 1 - 6 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  statements of condition  for each Trust  and the accountant's report
       with regard thereto.
 
       The amount of the Trustee's Fee
 
CHAPMAN AND CUTLER
 
Chicago, Illinois
 
   
February 5, 1997
    


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