NUVEEN TAX EXEMPT UNIT TRUST SERIES 768
487, 1994-11-22
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<PAGE>


                                                      File No. 33-56357
                                                      40 Act File No. 811-2271


                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549

                                AMENDMENT NO. 1
                                       TO
                                    FORM S-6

For Registration under the Securities Act of 1933 of Securities of Unit
Investment Trusts Registered on Form N-8B-2

A.  Exact name of Trust:     NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 768

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

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

                             333 West Wacker Drive
                             Chicago, Illinois  60606

D.  Name and complete address of agents for service:

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

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

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

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

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

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

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

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

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

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

H.  Approximate date of proposed sale to the public:

    As soon as practicable after the effective date of the Registration
    Statement.
______
          Check box if it is proposed that this filing will become effective
  X       on 11/22/94 at 1:30 p.m. pursuant to Rule 487.
______



<PAGE>
   
                               NOVEMBER 22, 1994
                             SUBJECT TO COMPLETION
 
NUVEEN  Tax-Exempt Unit Trusts
             PROSPECTUS
             Series 768
             November 22, 1994
    
INTEREST  INCOME TO THE  TRUSTS AND TO  UNITHOLDERS, IN THE  OPINION OF COUNSEL,
UNDER EXISTING LAW IS EXEMPT FROM FEDERAL INCOME TAX. CAPITAL GAINS, IF ANY, ARE
SUBJECT TO TAX. IN ADDITION, INTEREST INCOME OF STATE TRUSTS IS, IN THE  OPINION
OF  COUNSEL,  EXEMPT,  TO THE  EXTENT  INDICATED,  FROM STATE  AND  LOCAL TAXES.
INTEREST INCOME OF ANY TRUST  OTHER THAN A STATE TRUST  MAY BE SUBJECT TO  STATE
AND LOCAL TAXES.
 
CURRENTLY  OFFERED AT PUBLIC OFFERING PRICE PLUS INTEREST ACCRUED TO THE DATE OF
SETTLEMENT. MINIMUM PURCHASE--EITHER $5,000 OR 50 UNITS, WHICHEVER IS LESS.
 
   
THE NUVEEN  TAX-EXEMPT  UNIT  TRUST,  SERIES 768  consists  of  four  underlying
separate  unit  investment trusts  designated as  California Insured  Trust 236,
Colorado Insured Trust  54, Georgia  Insured Trust 41  and Pennsylvania  Insured
Trust  190. Each  Trust initially  consists of  delivery statements  relating to
contracts to  purchase Bonds  and,  thereafter, will  consist of  a  diversified
portfolio of obligations issued by or on behalf of states and territories of the
United  States and authorities and political subdivisions thereof (see SCHEDULES
OF INVESTMENTS), the interest on which is, in the opinion of bond counsel to the
issuers, exempt from  Federal income tax  under existing law.  In addition,  the
interest  on Bonds in each State Trust is, in the opinion of bond counsel to the
issuers of the obligations, exempt from  such State's income taxes, if any.  All
obligations in each Traditional Trust are rated in the category "A" or better by
Standard  & Poor's Corporation or Moody's Investors Service, Inc. on the Date of
Deposit. All  obligations in  each  Insured Trust  are  covered by  policies  of
insurance  obtained  from  the Municipal  Bond  Investors  Assurance Corporation
guaranteeing payment of principal  and interest when due.  All such policies  of
insurance  remain effective  so long  as the  obligations are  outstanding. As a
result of such insurance, the Bonds in each portfolio of the Insured Trusts have
received a rating of "Aaa" by Moody's  Investors Service, Inc. and the Bonds  in
the  Insured Trusts and the  Units of each such Trust  have received a rating of
"AAA" by Standard & Poor's Corporation.  INSURANCE RELATES ONLY TO THE BONDS  IN
THE INSURED TRUSTS AND NOT TO THE UNITS OFFERED HEREBY OR TO THEIR MARKET VALUE.
(See Section 5.)
    
 
THE  OBJECTIVES of the Trusts are  tax-exempt income and conservation of capital
through a diversified  investment in tax-exempt  Bonds. (SEE SECTIONS  2, 3  AND
11.)  The payment of interest and the  preservation of principal are, of course,
dependent upon the continuing ability of the issuers of Bonds and of any insurer
thereof to meet  their obligations thereunder.  There is no  guarantee that  the
Trusts' objectives will be achieved. (SEE PAGE A-1.)
 
DISTRIBUTIONS  of interest  received by  each Trust  will be  made semi-annually
unless the Unitholder elects to receive them monthly or quarterly. (SEE  SECTION
13.)  Distribution of funds in the Principal Account, if any, will ordinarily be
made semi-annually.
 
FOR ESTIMATED LONG TERM RETURNS AND ESTIMATED CURRENT RETURNS to Unitholders  in
each  Trust on the  business day prior to  the Date of Deposit.  (SEE PAGE 3 AND
SECTION 9.)
 
THE PUBLIC OFFERING  PRICE per Unit  of each Trust  during the initial  offering
period  is equal to a pro rata share of the OFFERING prices of the Bonds in such
Trust's portfolio plus  a sales charge  of up  to 4.90% of  the Public  Offering
Price  (equivalent to 5.152%  of the net  amount invested); the  sales charge is
somewhat lower on Trusts  with lesser average maturities.  (SEE SECTION 6.)  The
Secondary  Market Public Offering Price per Unit for each Trust will be equal to
a pro rata share of the  sum of BID prices of the  Bonds in such Trust plus  the
sales  charges determined based on the number of years remaining to the maturity
of each  Bond. Accrued  interest from  the  preceding Record  Date to,  but  not
including,  the settlement date (normally five  business days after purchase) is
added to the Public Offering Price. The  sales charge is reduced on a  graduated
scale  for sales involving at least $50,000 or  500 Units and will be applied on
whichever basis is more favorable to the purchaser. (SEE SECTION 6.)
 
A UNITHOLDER MAY REDEEM UNITS at the office of the Trustee, United States  Trust
Company of New York, at prices based upon the BID prices of the Bonds. The price
received  upon  redemption  may  be  more  or  less  than  the  amount  paid  by
Unitholders, depending upon the  value of the  Bonds on the  date of tender  for
redemption.  (SEE  SECTION 19.)  The Sponsor,  although not  required to  do so,
intends to make a secondary market for  the Units of the Trusts at prices  based
upon  the BID  prices of the  Bonds in  the respective Trusts.  (SEE SECTION 7.)
RETAIN THIS PROSPECTUS FOR FUTURE REFERENCE.
 
UNITS OF THE TRUST ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK AND ARE NOT FEDERALLY INSURED OR OTHERWISE PROTECTED BY THE FEDERAL
DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY AND
INVOLVE INVESTMENT RISK, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.
 
THESE SECURITIES HAVE  NOT BEEN APPROVED  OR DISAPPROVED BY  THE SECURITIES  AND
EXCHANGE  COMMISSION OR ANY  STATE SECURITIES COMMISSION  NOR HAS THE SECURITIES
AND EXCHANGE  COMMISSION OR  ANY  STATE SECURITIES  COMMISSION PASSED  UPON  THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
<PAGE>
  NUVEEN  Tax-Exempt Unit Trusts
 
<TABLE>
<CAPTION>
      INDEX                                             SECTION         PAGE
<C>   <S>                                              <C>        <C>
      SPECIFIC TRUST MATTERS
      California Insured Trust 236                            3         8-20
      Colorado Insured Trust 54                               3        21-28
      Georgia Insured Trust 41                                3        29-36
      Pennsylvania Insured Trust 190                          3        37-46
      GENERAL MATTERS
      Accrued Interest                                        8         A-17
      Accumulation Plan                                      14         A-24
      Bonds, How Selected                                     3            7
      Bonds, Initial Determination of Offering Price         10         A-19
      Bonds, Limited Right of Substitution                    4          A-7
      Bond Ratings                                            3         8-46
      Bonds, Removal from Trust                              21         A-33
      Call Provisions of Portfolio Bonds                   3, 4     8-46,A-8
      Capital Gains Taxability                               11         A-19
      Dealer Discount                                        17         A-29
      Description of Units of Trust                           1            5
      Distributions to Unitholders                           13         A-23
      Distribution Payment Dates                          3, 13   8-46, A-23
      Distribution of Units to the Public                    17         A-29
      Essential Information Regarding the Trusts             --            4
      Estimated Long Term Return and Estimated Current
      Return                                                  9      3, A-18
      Evaluation                                             16         A-28
      Expenses to Fund                                       12         A-22
      Insurance on Bonds in the Insured Trusts                5         A-10
      Insurance on Certain Bonds in the Traditional
      Trusts                                                  5         A-12
      Interest Income to Trust                                3         8-46
      Investments, Schedules of                               3         8-46
      Legality of Units                                      24         A-37
      Limitations on Liabilities of Sponsor and Trustee       22        A-34
      Market for Units                                        7         A-16
      Minimum Transaction                                    17         A-29
      Objectives of the Trusts                                2            6
      Optional Distribution Plan                             13         A-23
      Other Information                                      24         A-36
      Ownership and Transfer of Units                        18         A-30
      Public Offering Price of Units                          6         A-13
      Quantity Purchases                                      6         A-13
      Record Dates                                           13         A-23
      Ratings, Description of                                24         A-38
      Redemption of Units by Trustee                         19         A-31
      Reports to Unitholders                                 15         A-28
      Repurchase of Units by Sponsor                         20         A-33
      Risk Factors                                            3          A-1
      Sales Charge                                            6         A-13
      Sponsor, Information About                             23         A-35
      State Tax Status                                        3         8-46
      Successor Trustees and Sponsors                        22         A-34
      Tax Status of Unitholders                              11         A-19
      Trustee, Information About                             22         A-34
      Trust Indenture, Amendment and Termination             24         A-36
      Unit Value                                             16         A-28
</TABLE>
 
                  2
<PAGE>
                          ESTIMATED LONG TERM RETURNS
                                      AND
                    ESTIMATED CURRENT RETURNS FOR THE TRUSTS
 
Following  are the  Estimated Long Term  and Estimated Current  Returns for each
Trust on the  business day  prior to  the Date  of Deposit,  under the  monthly,
quarterly and semi-annual plans of distribution (SEE SECTION 3):
 
                          ESTIMATED LONG TERM RETURNS
 
<TABLE>
<CAPTION>
                                                          PLAN OF DISTRIBUTION
                                                ----------------------------------------
                    TRUST                       MONTHLY      QUARTERLY      SEMI-ANNUAL
  <S>                                           <C>          <C>            <C>
  --------------------------------------------------------------------------------------
  California Insured Trust 236.............      6.55%         6.59%           6.61%
  Colorado Insured Trust 54................      6.49%         6.52%           6.54%
  Georgia Insured Trust 41.................      6.49%         6.52%           6.54%
  Pennsylvania Insured Trust 190...........      6.54%         6.57%           6.59%
</TABLE>
 
                           ESTIMATED CURRENT RETURNS
 
<TABLE>
<CAPTION>
                                                          PLAN OF DISTRIBUTION
                                                ----------------------------------------
                    TRUST                       MONTHLY      QUARTERLY      SEMI-ANNUAL
  <S>                                           <C>          <C>            <C>
  --------------------------------------------------------------------------------------
  California Insured Trust 236.............      6.40%         6.44%           6.46%
  Colorado Insured Trust 54................      6.31%         6.35%           6.37%
  Georgia Insured Trust 41.................      6.28%         6.32%           6.34%
  Pennsylvania Insured Trust 190...........      6.34%         6.38%           6.40%
</TABLE>
 
    The  Estimated Long Term Return for each Trust is a measure of the return to
the investor earned  over the estimated  life of the  Trust. The Estimated  Long
Term  Return represents an  average of the  yields to maturity  (or call) of the
Bonds in  the Trust's  portfolio  calculated in  accordance with  accepted  bond
practice and adjusted to reflect expenses and sales charges. Under accepted bond
practice,  tax-exempt bonds  are customarily  offered to  investors on  a "yield
price" basis, which involves computation of  yield to maturity or to an  earlier
call date (whichever produces the lower yield), and which takes into account not
only the interest payable on the bonds but also the amortization or accretion to
a  specified date of any premium over  or discount from the par (maturity) value
in the bond's  purchase price. In  calculating Estimated Long  Term Return,  the
average  yield for  the Trust's  portfolio is  derived by  weighting each Bond's
yield by the market value of the Bond and by the amount of time remaining to the
date to which the Bond is priced. Once the average portfolio yield is  computed,
this  figure is then reduced to reflect estimated expenses and the effect of the
maximum sales  charge paid  by investors.  The Estimated  Long Term  Return  and
Estimated  Current Return calculations do not take  into account the effect of a
first distribution which may be less than a regular distribution or may be  paid
at  some point after 30 days (or a  second distribution which may be less than a
normal distribution for Unitholders who choose quarterly or semi-annual plans of
distribution), and it also does not  take into account the difference in  timing
of  payments  to  Unitholders  who  choose  quarterly  or  semi-annual  plans of
distribution, each of which will reduce the return.
 
    Estimated Current Return  is computed  by dividing the  Net Annual  Interest
Income per Unit by the Public Offering Price. In contrast to Estimated Long Term
Return, Estimated Current Return does not reflect the amortization of premium or
accretion of discount, if any, on the Bonds in the Trust's portfolio. Net Annual
Interest Income per Unit is calculated by dividing the annual interest income to
the Trust, less estimated expenses, by the number of Units outstanding.
 
    Net  Annual Interest  Income per Unit,  used to  calculate Estimated Current
Return, will vary  with changes  in fees  and expenses  of the  Trustee and  the
Evaluator  and with the redemption, maturity, exchange or sale of Bonds. A Trust
may experience expenses and  portfolio changes different  from those assumed  in
the  calculation of Estimated Long  Term Return. There thus  can be no assurance
that the Estimated  Current Returns or  the Estimated Long  Term Returns  quoted
herein will be realized in the future. Both the Estimated Current Return and the
Estimated  Long Term Return quoted  herein are based on  the market value of the
underlying Bonds on the  business day prior to  the Date of Deposit;  subsequent
calculations  of these performance measures will reflect the then current market
value of the underlying Bonds and may be higher or lower. For more  information,
see Section 9. The Sponsor will provide estimated cash flow information relating
to  a Trust without  charge to each  potential investor in  a Trust who receives
this prospectus and makes  an oral or  written request to  the Sponsor for  such
information.
 
                                       3
<PAGE>
   
                 ESSENTIAL INFORMATION REGARDING THE TRUSTS ON
                               NOVEMBER 21, 1994+
    
           Sponsor and Evaluator...... John Nuveen & Co. Incorporated
           Trustee........... United States Trust Company of New York
                  -------------------------------------------
 
The  income, expense and distribution data  set forth below have been calculated
for  Unitholders   receiving   MONTHLY   distributions.   Unitholders   choosing
distributions  quarterly or  semi-annually will receive  slightly higher returns
because of the lower Trustee's fees and expenses under such plans. (SEE  SECTION
3 FOR DATA RELATING TO THESE PLANS.)
 
<TABLE>
<CAPTION>
                                                        CALIFORNIA           COLORADO             GEORGIA          PENNSYLVANIA
                                                          INSURED             INSURED             INSURED             INSURED
                                                         TRUST 236           TRUST 54            TRUST 41            TRUST 190
<S>                                                   <C>                 <C>                 <C>                 <C>
                                                      ---------------     ---------------     ---------------     ---------------
Principal Amount of Bonds in Trust..................  $    3,500,000      $    3,500,000      $    3,500,000      $    3,500,000
Number of Units.....................................          35,000              35,000              35,000              35,000
Fractional Undivided Interest in Trust Per Unit.....        1/35,000            1/35,000            1/35,000            1/35,000
Public Offering Price--Less than 500 Units
    Aggregate Offering Price of Bonds in Trust......  $    3,067,130      $    3,100,120      $    3,071,400      $    3,090,230
    Divided by Number of Units......................  $        87.63      $        88.57      $        87.75      $        88.29
    Plus Sales Charge*..............................  $         4.51      $         4.56      $         4.52      $         4.55
    Public Offering Price Per Unit(1)...............  $        92.14      $        93.13      $        92.27      $        92.84
Redemption Price Per Unit (exclusive of accrued
  interest).........................................  $        87.13      $        88.09      $        87.27      $        87.81
Sponsor's Initial Repurchase Price Per Unit
  (exclusive of accrued interest)...................  $        87.63      $        88.57      $        87.75      $        88.29
Excess of Public Offering Price Per Unit over
  Redemption Price Per Unit.........................  $         5.01      $         5.04      $         5.00      $         5.03
Excess of Public Offering Price Per Unit over
  Sponsor's Repurchase Price Per Unit...............  $         4.51      $         4.56      $         4.52      $         4.55
Calculation of Estimated Net Annual Interest Income
  Per Unit
    Annual Interest Income(2).......................  $       6.1464      $       6.1009      $       6.0364      $       6.1286
    Less Estimated Annual Expense...................  $        .2481      $        .2237      $        .2380      $        .2388
                                                      ---------------     ---------------     ---------------     ---------------
    Estimated Net Annual Interest Income(3).........  $       5.8983      $       5.8772      $       5.7984      $       5.8898
Daily Rate of Accrual Per Unit......................  $       .01638      $       .01632      $       .01610      $       .01636
Estimated Current Return(4).........................           6.40%               6.31%               6.28%               6.34%
Estimated Long Term Return(4).......................           6.55%               6.49%               6.49%               6.54%
 
<FN>
- ----------
Evaluations  for purpose of sale,  purchase or redemption of  Units are made as of  4 p.m. Eastern time  on the business day next
following receipt of an order by the Sponsor or Trustee. (See Section 6.)
 + The business day prior to the Date of Deposit.
 * National and State, 5.152%;  Long Intermediate, 4.439%; Intermediate, 4.058%;  Short Intermediate, 3.093%; Short Term,  2.564%
   (4.9%, 4.25%, 3.9%, 3.0% and 2.5% of the Public Offering Prices, respectively.)
(1)  Units are offered at the Public  Offering Price plus accrued interest from the  preceding Record Date to, but not including,
    the date of settlement (normally five business days after purchase).  The Date of Deposit of the Fund has been designated  as
    the  First Record  Date for all  plans of distribution  of the Trusts  and, accordingly, for  Units purchased on  the Date of
    Deposit, the following  amounts of accrued  interest to  the Settlement Date  will be  added to the  Public Offering  Prices:
    California  Insured  Trust--$.13,  Colorado  Insured  Trust--$.13,  Georgia  Insured  Trust--$.13  and  Pennsylvania  Insured
    Trust--$.13. (See Section 8.)
(2) Assumes delivery of  all Bonds. (See Section  4.) Interest income does  not include accretion of  original issue discount  on
    "zero coupon" Bonds, Stripped Obligations or other original issue discount Bonds. (See "General Trust Information" in Section
    3.)
(3)  The amount and timing of interest distributions from each Trust under the various plans of distribution are shown in Section
    3.
(4) Estimated Long Term Return  for each Trust represents  the average of the yields  to maturity (or call)  of the Bonds in  the
    Trust's  portfolio calculated in accordance with accepted bond practices  and adjusted to reflect expenses and sales charges.
    Estimated Current Return is computed by dividing the Net Annual Interest Income per Unit by the Public Offering Price, and in
    contrast to Estimated Long Term  Return does not reflect the  amortization of premium or accretion  of discount, if any.  For
    more information see page 3 and Section 9.
</TABLE>
 
                                       4
<PAGE>
                   ESSENTIAL INFORMATION REGARDING THE TRUSTS
                                  (CONTINUED)
 
<TABLE>
<S>                                         <C>
Record Dates............................................................See Section 13
Distribution Dates......................................................See Section 13
Minimum Principal Distribution..........................................$0.10 Per Unit
Date Trusts Established..............................................November 22, 1994
Settlement Date......................................................November 30, 1994
Mandatory Termination Date..............................................See Section 24
Minimum Value of Each Trust.............................................See Section 24
Sponsor's Annual Evaluation Fee.............$0.17 per $1,000 principal amount of Bonds
Trustee's Annual Fees:
</TABLE>
 
<TABLE>
<CAPTION>
                                                           PLAN OF DISTRIBUTION
                                                ------------------------------------------
                    TRUST                        MONTHLY       QUARTERLY      SEMI-ANNUAL
  -----------------------------------------     ----------     ----------     ------------
  <S>                                           <C>            <C>            <C>
  California Insured Trust 236.............     $  1.8504      $  1.5304      $   1.3404
  Colorado Insured Trust 54................        1.6059         1.2859          1.0959
  Georgia Insured Trust 41.................        1.7492         1.4292          1.2392
  Pennsylvania Insured Trust 190...........        1.7571         1.4371          1.2471
  ------------
  *  Each Trustee annual fee is  per $1,000 principal amount of  the underlying Bonds in a
    Trust for that portion of the Trust that represents a particular plan of distribution.
</TABLE>
 
                          ---------------------------
 
THE NUVEEN TAX-EXEMPT UNIT TRUST
   
SERIES 768
    
 
   
1.  WHAT IS THE NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 768?
    
 
   
Series 768 of the Nuveen  Tax-Exempt Unit Trust is one  of a series of  separate
but  similar  investment companies  created  by the  Sponsor,  each of  which is
designated by a different Series number. This Series consists of four underlying
separate  unit  investment  trusts,  combined  under  one  trust  indenture  and
agreement,  designated California Insured Trust  236, Colorado Insured Trust 54,
Georgia Insured Trust 41 and Pennsylvania Insured Trust 190. The various  trusts
are  collectively referred to herein as the "Trusts"; the trusts in which few or
none of the  Bonds are  insured are sometimes  referred to  as the  "Traditional
Trusts",  the trusts in which  all of the Bonds  are insured as described herein
are sometimes referred to  as the "Insured Trusts",  and the state trusts  (both
Traditional  and Insured) are sometimes referred to as the "State Trusts." THERE
ARE NO TRADITIONAL TRUSTS IN THIS SERIES. This Series was created under the laws
of the State  of New  York pursuant  to a  Trust Indenture  and Agreement  dated
November  22, 1994 (the "Indenture") between John Nuveen & Co. Incorporated (the
"Sponsor") and United States Trust Company of New York (the "Trustee").
    
 
   
    The Sponsor has deposited with  the Trustee delivery statements relating  to
contracts  for the  purchase of municipal  debt obligations  together with funds
represented by an irrevocable letter of credit issued by a major commercial bank
in the amount, including accrued interest,  required for their purchase (or  the
obligations  themselves) in the  principal amount of  $14,000,000 (the "Bonds"),
which initially constitute the underlying securities of the
    
 
                                       5
<PAGE>
   
Trusts. Bonds  may  include  fixed rate  obligations  with  regularly  scheduled
interest  payments, zero coupon bonds  and stripped obligations, which represent
evidences of ownership interests with respect to either a principal payment or a
payment of interest  on a  tax-exempt obligation  ("Stripped Obligations").  See
"SUMMARY OF PORTFOLIOS" and "GENERAL TRUST INFORMATION" for a discussion of zero
coupon  bonds  and Stripped  Obligations. The  following principal  amounts were
deposited in each Trust: $3,500,000 in the California Insured Trust,  $3,500,000
in  the  Colorado Insured  Trust, $3,500,000  in the  Georgia Insured  Trust and
$3,500,000 in the Pennsylvania  Insured Trust. Some  of the delivery  statements
may  relate to contracts for  the purchase of "when  issued" or other Bonds with
delivery dates after the date of settlement  for a purchase made on the Date  of
Deposit.  See the "Schedules of Investments" and  Section 4. For a discussion of
the Sponsor's obligations  in the event  of a  failure of any  contract for  the
purchase  of any of the Bonds and its limited right to substitute other bonds to
replace any failed contract, see Section 4.
    
 
    Payment of interest on the Bonds in each Insured Trust, and of principal  at
maturity,  is guaranteed under policies of  insurance obtained by the Sponsor or
by the issuers of the Bonds. (See  Section 5.) As a general matter, neither  the
issuer  nor the Sponsor has obtained insurance  with respect to the Bonds in any
Traditional Trust.
 
   
    The Trustee has delivered to the  Sponsor registered Units for 35,000  Units
of  the California  Insured Trust, 35,000  Units of the  Colorado Insured Trust,
35,000 Units of the Georgia Insured  Trust and 35,000 Units of the  Pennsylvania
Insured  Trust, which  together represent  ownership of  the entire  Series, and
which are offered for sale by this Prospectus. Each Unit of a Trust represents a
fractional undivided interest in the principal  and net income of such Trust  in
the  ratio  of 10  Units  for each  $1,000  principal value  of  Bonds initially
deposited in such Trust.
    
 
2.  WHAT ARE THE OBJECTIVES OF THE TRUSTS?
 
The objectives of the Trusts are income  exempt from Federal income tax and,  in
the  case of State Trusts, where applicable, state income and intangibles taxes,
and conservation of capital, through an  investment in obligations issued by  or
on  behalf of states  and territories of  the United States  and authorities and
political subdivisions thereof,  the interest  on which  is, in  the opinion  of
recognized  bond counsel  to the  issuing governmental  authorities, exempt from
Federal income tax under existing law. Bonds in any State Trust have been issued
primarily by  or on  behalf of  the  State for  which such  Trust is  named  and
counties,  municipalities, authorities  and political  subdivisions thereof, the
interest on which Bonds is, in the opinion of bond counsel, exempt from  Federal
and  certain state income tax and intangibles  taxes, if any, for purchasers who
qualify as residents of that  State. Insurance guaranteeing the timely  payment,
when  due, of all principal and interest on  the Bonds in each Insured Trust has
been obtained by the Sponsor or by the issuers of such Bonds from Municipal Bond
Investors  Assurance  Corporation,  and  as  a  result  of  such  insurance  the
obligations  in the Insured Trusts are rated "Aaa" by Moody's Investors Service,
Inc. and "AAA" by Standard & Poor's Corporation. (SEE SECTION 5) All obligations
in each Traditional Trust are rated in the category "A" or better (SP-1 or MIG 2
or better  in the  case  of short  term obligations  included  in a  Short  Term
Traditional  Trust)  by  Standard  &  Poor's  Corporation  or  Moody's Investors
Service, Inc.  (including  provisional  or conditional  ratings).  In  addition,
certain  Bonds  in  certain  Traditional  Trusts  may  be  covered  by insurance
guaranteeing the timely payment, when due,  of all principal and interest.  (SEE
SECTION  3.) The  portfolios of National  and State Trusts  consist of long-term
(approximately   15   to   40    year   maturities)   obligations;   those    of
 
                                       6
<PAGE>
Long  Intermediate Trusts consist of intermediate to long term (approximately 11
to 19  year maturities)  obligations; those  of Intermediate  Trusts consist  of
intermediate  term (approximately 5 to 15 year maturities) obligations; those of
Short Intermediate Trusts consist of short to intermediate term (approximately 3
to 7 year  maturities) obligations; and  those of Short  Term Trusts consist  of
short  term (approximately  1 to  5 year  maturities) obligations.  There is, of
course, no  guarantee  that the  Trusts'  objectives  will be  achieved.  For  a
comparison  of net  after-tax return for  various tax brackets  see the "Taxable
Equivalent Estimated Current Return Tables" included in this Prospectus.
 
    Each Trust consists  of fixed-rate  municipal debt  obligations. Because  of
this  an investment in a Trust should be made with an understanding of the risks
which an investment in such debt obligations may entail, including the risk that
the value of the debt obligations and  therefore of the Units will decline  with
increases  in  interest  rates. In  general,  the  longer the  period  until the
maturity of a  Bond, the more  sensitive its  value will be  to fluctuations  in
interest rates. During the past decade, there have been substantial fluctuations
in  interest  rates, and,  accordingly, in  the value  of debt  obligations. The
Sponsor cannot predict whether such fluctuations will recur.
 
3.  SUMMARY OF PORTFOLIOS
 
In selecting  Bonds for  the  respective Trusts,  the following  factors,  among
others,  were considered:  (i) the Standard  & Poor's Corporation  rating of the
Bonds or the Moody's Investors Service, Inc. rating of the Bonds (see Section  2
for  a description of  minimum rating standards),  (ii) the prices  of the Bonds
relative  to  other  bonds  of  comparable  quality  and  maturity,  (iii)   the
diversification of Bonds as to purpose of issue and location of issuer, (iv) the
maturity dates of the Bonds, and (v) in the case of the Insured Trusts only, the
availability of Municipal Bond Investors Assurance Corporation insurance on such
Bonds.
 
    In  order for Bonds in the Insured  Trusts to be eligible for Municipal Bond
Investors Assurance Corporation insurance, they must have credit characteristics
which, in the opinion of the  insurer, would qualify them as "investment  grade"
obligations.  Insurance is not a  substitute for the basic  credit of an issuer,
but supplements the existing credit  and provides additional security  therefor.
(SEE SECTION 5.)
 
    Certain  bonds may carry a "mandatory put" (also referred to as a "mandatory
tender" or "mandatory repurchase") feature pursuant to which the holder of  such
bonds will receive payment of the full principal amount thereof on a stated date
prior  to the maturity date unless such  holder affirmatively acts to retain the
bond. Under the Indenture,  the Trustee does  not have the  authority to act  to
retain  Bonds with  such features; accordingly,  it will receive  payment of the
full principal amount of any such Bonds on the stated put date and such date  is
therefore  treated as the maturity date of such Bonds in selecting Bonds for the
respective Trusts and for  purposes of calculating the  average maturity of  the
Bonds in any Trust.
 
                                       7
<PAGE>
   
CALIFORNIA INSURED TRUST 236
    
 
   
    The  Portfolio of  California Insured  Trust 236  consists of  6 obligations
issued by entities located in California and one obligation issued by an  entity
located  in the  Territory of Puerto  Rico. One Bond  in the Trust  is a general
obligation of the  governmental entity issuing  it and is  backed by the  taxing
power  thereof. Six Bonds in the Trust  are payable as to principal and interest
from the income of a specific project or authority and are not supported by  the
issuer's power to levy taxes. The sources of payment for these Bonds are divided
as  follows:  Electrical System  Revenue, 1;  Health  Care Facility  Revenue, 1;
Municipal Lease  Revenue,  1;  Water  and/or  Sewer  Revenue,  2;  Miscellaneous
Revenue, 1. All of the Bonds in the Trust, as insured, are rated AAA by Standard
& Poor's Corporation and Aaa by Moody's Investors Service, Inc.
    
 
   
    At  the Date of Deposit, the average maturity of the Bonds in the California
Insured Trust is 28.4  years. The average  maturity of the Bonds  in a Trust  is
calculated based upon the stated maturities of the Bonds in such Trust (or, with
respect  to Bonds for  which funds or  securities have been  placed in escrow to
redeem such Bonds on a stated call date, based upon such call date). The average
maturity of the Bonds in a Trust may  increase or decrease from time to time  as
Bonds mature or are called or sold.
    
 
    Approximately  29% of  the aggregate  principal amount  of the  Bonds in the
Trust consists of obligations  of issuers whose  revenues are primarily  derived
from the sale of water and/or sewerage services.
 
    For  a discussion of the  risks associated with investments  in the bonds of
various issuers, see "General Trust Information" in this section.
 
   
    The Sponsor entered  into contracts  to acquire  the Bonds  on November  21,
1994.  The following  summarizes certain information  about the Bonds  as of the
business day prior to the Date of Deposit:
    
 
<TABLE>
<CAPTION>
                                                                  DIFFERENCE BETWEEN TRUSTEE'S
                                                               DETERMINATION OF OFFERING PRICE AND
   COST TO    PROFIT (OR LOSS)   ANNUAL INTEREST   BID PRICE              THE BID PRICE
   SPONSOR       TO SPONSOR      INCOME TO TRUST    OF BONDS       (AS % OF PRINCIPAL AMOUNT)
  ----------  -----------------  ----------------  ----------  -----------------------------------
  <S>         <C>                <C>               <C>         <C>
  $3,056,082       $11,048           $215,125      $3,049,630                 .50%
</TABLE>
 
    Neither  cost  to  Sponsor  nor   profit  (or  loss)  to  Sponsor   reflects
underwriting  profits or losses received or  incurred by the Sponsor through its
participation  in  underwriting  syndicates.  An  underwriter  or   underwriting
syndicate  purchases bonds  from the issuer  on a negotiated  or competitive bid
basis as principal with  the motive of  marketing such bonds  to investors at  a
profit.  The Sponsor did not participate as  either the sole underwriter or as a
manager or member of a syndicate that  acted as the original underwriter of  any
of the Bonds.
 
   
    Unitholders  may elect  to have  interest distributions  made on  a monthly,
quarterly or semi-annual basis. The interest on the Bonds initially deposited in
the California Insured Trust, less estimated expenses, is estimated to accrue at
the rate of $.01652 per Unit per day under the semi-annual plan of distribution,
$.01647 per Unit per  day under the quarterly  plan of distribution and  $.01638
per  Unit per day under the monthly plan of distribution. It is anticipated that
the amount of interest to be distributed  per Unit in each year under each  plan
of  distribution  will initially  be substantially  equal  to the  Estimated Net
Annual Interest Income per Unit for that plan.
    
 
                                       8
<PAGE>
    Details of interest distributions per  Unit of the California Insured  Trust
under  the various plans appear in the  following table based upon estimated Net
Annual Interest Income at the Date of Deposit:
 
<TABLE>
<CAPTION>
                                                                                                                       NORMAL
                                                                                                                   DISTRIBUTIONS
CALIFORNIA INSURED TRUST                                                1995                                          PER YEAR
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        1/1            2/1            5/1            8/1           11/1
Distribution Date.....................       1/15           2/15           5/15           8/15          11/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .6388(1)                                                               $  5.8983
                                                              --------   $.4914 every month   --------
Quarterly Distribution Plan...........  $   .6388(1)   $   .4941(2)   $  1.4823      $  1.4823      $  1.4823      $  5.9303
Semi-Annual Distribution Plan.........  $   .6388(1)                  $  1.9824(3)                  $  2.9736      $  5.9493
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
 * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May  1,
   August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1)  The first distribution will be paid to all Unitholders,  regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The  second distribution  under the  quarterly  distribution plan  represents a  1-month distribution;  subsequent  quarterly
    distributions will be regular 3-month distributions.
(3)  The second distribution  under the semi-annual distribution  plan represents a  4-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
    The accrual amounts set forth above, and  in turn the amount of interest  to
be  distributed annually per Unit, will  generally change as Bonds are redeemed,
mature or are sold or as fees and expenses increase or decrease.
 
TAX STATUS--CALIFORNIA INSURED TRUST
 
    For a discussion of  the Federal tax status  of income earned on  California
Insured Trust Units, see Section 11.
 
    In the opinion of Orrick, Herrington & Sutcliffe, special California counsel
to  the Series, under existing California income and property tax law applicable
to individuals who are California residents:
 
        The California  Insured  Trust  is  not  an  association  taxable  as  a
    corporation  and the income of the  California Insured Trust will be treated
    as the income of the Unitholders under the income tax laws of California.
 
        Interest on the underlying securities (which may include bonds or  other
    obligations  issued by the  governments of Puerto  Rico, the Virgin Islands,
    Guam or  the  Northern Mariana  Islands)  which  is exempt  from  tax  under
    California  personal income tax  and property tax laws  when received by the
    California Insured  Trust  will,  under  such laws,  retain  its  status  as
    tax-exempt  interest when  distributed to Unitholders.  However, interest on
    the underlying securities attributed to a Unitholder which is a  corporation
    subject  to the California franchise tax laws may be includable in its gross
    income for purposes of determining its California franchise tax.
 
        Under California  income  tax law,  each  Unitholder in  the  California
    Insured  Trust will have  a taxable event when  the California Insured Trust
    disposes of a security (whether by sale, exchange, redemption or payment  at
    maturity)  or when  the Unitholder  redeems or  sells Units.  Because of the
    requirement that tax cost basis be  reduced to reflect amortization of  bond
    premium, under some circumstances a Unitholder may realize taxable gain when
    Units  are sold  or redeemed  for an  amount equal  to, or  less than, their
    original cost.  The  total  tax  cost  of  each  Unit  to  a  Unitholder  is
 
                                       9
<PAGE>
    allocated among each of the bond issues held in the California Insured Trust
    (in accordance with the proportion of the California Insured Trust comprised
    by  each bond issue)  in order to determine  his per unit  tax cost for each
    bond issue; and the tax cost reduction requirements relating to amortization
    of bond premium  will apply separately  to the  per unit cost  of each  bond
    issue. Unitholders' bases in their Units, and the bases for their fractional
    interest in each California Insured Trust asset, may have to be adjusted for
    their  pro rata  share of accrued  interest received, if  any, on securities
    delivered after the Unitholders' respective settlement dates.
 
        Under the California  personal property tax  laws, bonds (including  the
    bonds  in  the  California  Insured  Trust  as  well  as  "regular-way"  and
    "when-issued" contracts for the purchase  of bonds) or any interest  therein
    is exempt from such tax.
 
        Any  proceeds paid under  the insurance policy issued  to the Trustee of
    the fund with respect to the bonds  in the California Insured Trust as  well
    as "regular-way" and "when-issued" contracts for the purchase of bonds which
    represent  maturing interest  on defaulted  obligations held  by the Trustee
    will be  exempt from  California personal  income tax  if, and  to the  same
    extent  as, such interest would have been so exempt if paid by the issuer of
    the defaulted obligations.
 
        Under Section 17280(b)(2) of the  California Revenue and Taxation  Code,
    interest on indebtedness incurred or continued to purchase or carry Units of
    the  California  Insured Trust  is not  deductible for  the purposes  of the
    California personal  income  tax. While  there  presently is  no  California
    authority  interpreting  this  provision,  Section  17280(b)(2)  directs the
    California Franchise  Tax Board  to  prescribe regulations  determining  the
    proper  allocation and apportionment of interest costs for this purpose. The
    Franchise Tax Board has not yet proposed or prescribed such regulations.  In
    interpreting  the generally similar Federal  provision, the Internal Revenue
    Service has taken the position that  such indebtedness need not be  directly
    traceable to the purchase or carrying of Units (although the Service has not
    contended that a deduction for interest
    on  indebtedness incurred to purchase or  improve a personal residence or to
    purchase goods or services for personal consumption will be disallowed).  In
    the  absence of conflicting  regulations or other  California authority, the
    California  Franchise  Tax  Board   generally  has  interpreted   California
    statutory   tax  provisions   in  accord   with  Internal   Revenue  Service
    interpretations of similar Federal provisions.
 
ECONOMIC FACTORS--CALIFORNIA
 
    As described  above, except  to the  extent the  Fund invests  in  temporary
investments,  the Fund will invest substantially all of its assets in California
Municipal Obligations. The Fund is therefore susceptible to political,  economic
or  regulatory factors  affecting issuers  of California  Municipal Obligations.
These include the possible adverse effects of certain California  constitutional
amendments,  legislative measures, voter initiatives  and other matters that are
described below. The following information provides only a brief summary of  the
complex  factors affecting the  financial situation in  California (the "State")
and is derived from  sources that are generally  available to investors and  are
believed  to  be accurate.  No  independent verification  has  been made  of the
accuracy or completeness  of any of  the following information.  It is based  in
part on information obtained from various State and local agencies in California
or   contained  in   Official  Statements   for  various   California  Municipal
Obligations.
 
                                       10
<PAGE>
    There can  be  no  assurance  that future  statewide  or  regional  economic
difficulties,  and the resulting impact on  State or local governmental finances
generally, will not adversely  affect the market  value of California  Municipal
Obligations  held in  the portfolio  of the  Fund or  the ability  of particular
obligors to  make timely  payments of  debt service  on (or  relating to)  those
obligations.
 
ECONOMIC OVERVIEW
 
    California's  economy is  the largest  among the  50 states  and one  of the
largest in the  world. The State's  population of almost  32 million  represents
12.3%  of the total United States population and grew by 27% in the 1980s. Total
personal income in the State, at an estimated $662 billion in 1992, accounts for
13% of all personal income in the nation. Total employment is almost 14 million,
the majority of which is in the service, trade and manufacturing sectors.
 
    Reports issued by the State Department of Finance and other sources indicate
that the State's economy is suffering its worst recession since the 1930s,  with
prospects  for recovery  slower than for  the nation  as a whole.  The State has
experienced the worst job losses in any postwar recession and employment  levels
are  not expected to stabilize until late 1994 or 1995. Pre-recession job levels
may not be reached until near the end of the decade. The largest job losses have
been in Southern California, led by  declines in the aerospace and  construction
industries. Weakness statewide occurred in manufacturing, construction, services
and  trade and will be hurt  in the next few years  by continued cuts in federal
defense spending and base closures. Unemployment averaged over 9% in 1993 and is
expected to remain high in  1994. The State's economy  is only expected to  pull
out  of the recession  slowly, following the national  recovery which has begun.
Delay in recovery will exacerbate shortfalls in State revenues.
 
CONSTITUTIONAL LIMITATIONS ON TAXES AND APPROPRIATIONS
 
    LIMITATION  ON  TAXES.  Certain  California  municipal  obligations  may  be
obligations  of issuers which rely in whole  or in part, directly or indirectly,
on AD  VALOREM property  taxes as  a source  of revenue.  The taxing  powers  of
California  local governments and districts are  limited by Article XIIIA of the
California Constitution, enacted  by the voters  in 1978 and  commonly known  as
"Proposition  13." Briefly, Article  XIIIA limits to  1% of full  cash value the
rate of AD VALOREM property taxes  on real property and generally restricts  the
reassessment  of property to 2% per year, except upon new construction or change
of ownership (subject to a number of exemptions). Taxing entities may,  however,
raise  AD VALOREM taxes above the 1% limit to pay debt service on voter-approved
bonded indebtedness.
 
    Under Article XIIIA, the basic 1% AD VALOREM tax levy is applied against the
assessed value of property as of the owner's date of acquisition (or as of March
1, 1975, if acquired earlier), subject  to certain adjustments. This system  has
resulted  in widely  varying amounts  of tax  on similarly  situated properties.
Several lawsuits have  been filed challenging  the acquisition-based  assessment
system of Proposition 13 and on June 18, 1992 the U.S. Supreme Court announced a
decision upholding Proposition 13.
 
    Article  XIIIA prohibits local governments  from raising revenues through AD
VALOREM property  taxes above  the 1%  limit;  it also  requires voters  of  any
governmental  unit to give two-thirds approval  to levy any "special tax." Court
decisions, however, allowed  non-voter approved  levy of  "general taxes"  which
were not dedicated to a specific use. In response to these decisions, the voters
of the State in 1986 adopted an initiative statute which imposed significant new
limits  on the ability of local entities  to raise or levy general taxes, except
by
 
                                       11
<PAGE>
receiving  majority  local   voter  approval.  Significant   elements  of   this
initiative,  "Proposition 62,"  have been overturned  in recent  court cases. An
initiative  proposed  to  re-enact  the  provisions  of  Proposition  62  as   a
constitutional amendment was defeated by the voters in November 1990, but such a
proposal may be renewed in the future.
 
    APPROPRIATIONS  LIMITS. California and its  local governments are subject to
an annual  "appropriations limit"  imposed by  Article XIIIB  of the  California
Constitution,  enacted  by  the  voters in  1979  and  significantly  amended by
Propositions 98 and 111 in 1988 and 1990, respectively. Article XIIIB  prohibits
the  State or any covered local government from spending "appropriations subject
to limitation" in  excess of the  appropriations limit imposed.  "Appropriations
subject  to limitation" are  authorizations to spend  "proceeds of taxes," which
consists of  tax  revenues and  certain  other funds,  including  proceeds  from
regulatory  licenses,  user  charges or  other  fees,  to the  extent  that such
proceeds exceed the cost of providing  the product or service, but "proceeds  of
taxes" excludes most State subventions to local governments. No limit is imposed
on appropriations of funds which are not "proceeds of taxes," such as reasonable
user charges or fees, and certain other non-tax funds, including bond proceeds.
 
    Among  the  expenditures not  included in  the Article  XIIIB appropriations
limit are (1)  the debt  service cost  of bonds  issued or  authorized prior  to
January  1, 1979, or  subsequently authorized by  the voters, (2) appropriations
arising from certain  emergencies declared by  the Governor, (3)  appropriations
for  certain  capital  outlay  projects,  (4)  appropriations  by  the  State of
post-1989  increases  in  gasoline  taxes  and  vehicle  weight  fees,  and  (5)
appropriations made in certain cases of emergency.
 
    The  appropriations  limit for  each year  is  adjusted annually  to reflect
changes in  cost  of  living  and  population,  and  any  transfers  of  service
responsibilities  between government units. The definitions for such adjustments
were liberalized in 1990 to follow more closely growth in California's economy.
 
    "Excess" revenues are measured over a two-year cycle. Local governments must
return any excess to taxpayers by rate  reduction. The State must refund 50%  of
any excess, with the other 50% paid to schools and community colleges. With more
liberal  annual adjustment factors since 1988, and depressed revenues since 1990
because of the  recession, few  governments are currently  operating near  their
spending  limits, but this condition may change over time. Local governments may
by voter approval exceed their spending limits for up to four years.
 
    Because of the complex nature of Articles XIIIA and XIIIB of the  California
Constitution,  the ambiguities and possible  inconsistencies in their terms, and
the impossibility of predicting future  appropriations or changes in  population
and  cost of living, and  the probability of continuing  legal challenges, it is
not currently possible to determine fully the impact of Article XIIIA or Article
XIIIB on California  Municipal Obligations or  on the ability  of California  or
local  governments to pay debt service on such California Municipal Obligations.
It is not presently  possible to predict the  outcome of any pending  litigation
with  respect  to  the ultimate  scope,  impact or  constitutionality  of either
Article XIIIA or Article  XIIIB, or the impact  of any such determinations  upon
State  agencies or local governments, or upon  their ability to pay debt service
on their obligations. Future initiatives or  legislative changes in laws or  the
California  Constitution  may also  affect  the ability  of  the State  or local
issuers to repay their obligations.
 
                                       12
<PAGE>
    OBLIGATIONS OF THE STATE OF CALIFORNIA. As of April 1, 1994, California  had
approximately  $18.1 billion of  general obligation bonds  outstanding, and $5.6
billion remained authorized  but unissued. In  addition, at June  30, 1993,  the
State  had lease-purchase obligations, payable from the State's General Fund, of
approximately $4.0 billion. Four general obligation bond propositions, totalling
$5.9 billion, will  be on the  June 1994  ballot. In fiscal  year 1992-93,  debt
service  on general obligation  bonds and lease-purchase  debt was approximately
4.1% of General Fund revenues. The State has paid the principal of and  interest
on  its general obligation bonds, lease-purchase debt and short-term obligations
when due.
 
    RECENT FINANCIAL RESULTS. The principal sources of General Fund revenues  in
1992-93  were the  California personal income  tax (44% of  total revenues), the
sales tax (38%), bank and corporation taxes (12%), and the gross premium tax  on
insurance  (3%). California maintains a  Special Fund for Economic Uncertainties
(the "Economic Uncertainties Fund"),  derived from General  Fund revenues, as  a
reserve to meet cash needs of the General Fund.
 
    GENERAL.  Throughout  the 1980's,  State spending  increased rapidly  as the
State population and economy also grew rapidly, including increased spending for
many assistance  programs  to  local  governments,  which  were  constrained  by
Proposition  13 and other laws. The largest State program is assistance to local
public school districts.  In 1988,  an initiative (Proposition  98) was  enacted
which  (subject to suspension  by a two-thirds  vote of the  Legislature and the
Governor) guarantees local  school districts and  community college districts  a
minimum share of State General Fund revenues (currently about 34%).
 
    Since  the  start  of  1990-91  Fiscal Year,  the  State  has  faced adverse
economic, fiscal,  and  budget  conditions.  The  economic  recession  seriously
affected  State tax revenues.  It also caused  increased expenditures for health
and welfare programs.  The State is  also facing a  structural imbalance in  its
budget  with  the largest  programs supported  by  the General  Fund (education,
health, welfare and corrections) growing at  rates higher than the growth  rates
for  the principal revenue sources  of the General Fund.  As a result, the State
entered a period of budget  imbalance, with expenditures exceeding revenues  for
four of the five fiscal years ending in 1991-92.
 
    As  the State fell  into a deep recession  in the summer  of 1990, the State
budget fell sharply  out of  balance in the  1990-91 and  1991-92 fiscal  years,
despite   significant  expenditure  cuts  and   tax  increases.  The  State  had
accumulated a $2.8 billion  budget deficit by June  30, 1992. This deficit  also
severely  reduced the State's cash resources, so that it had to rely on external
borrowing in the short-term markets to meet its cash needs.
 
    1992-93 FISCAL YEAR.  With  the failure to enact a  budget by July 1,  1992,
the State had no legal authority to pay many of its vendors until the budget was
passed;   nevertheless,  certain  obligations  (such  as  debt  service,  school
apportionments, welfare payments, and employee salaries) were payable because of
continuing or  special  appropriations,  or court  orders.  However,  the  State
Controller did not have enough cash to pay as they came due all of these ongoing
obligations, as well as valid obligations incurred in the prior fiscal year.
 
    Because  of the delay in enacting the  budget, the State could not carry out
its normal cash flow borrowing and, starting on July 1, 1992, the Controller was
required to issue  "registered warrants" in  lieu of normal  warrants backed  by
cash   to  pay  many   State  obligations.  Available  cash   was  used  to  pay
constitutionally mandated and priority obligations. Between July 1 and September
3, 1992, the  Controller issued an  aggregate of approximately  $3.8 billion  of
registered  warrants, all  of which were  called for redemption  by September 4,
 
                                       13
<PAGE>
1992 following enactment of the 1992-93 Budget Act and issuance by the State  of
$3.3 billion of Interim Notes.
 
    The 1992-93 Budget Act, when finally adopted, was projected to eliminate the
State's accumulated deficit, with additional expenditure cuts and a $1.3 billion
transfer of State education funding costs to local governments by shifting local
property  taxes to school districts. However,  as the recession continued longer
and deeper than expected,  revenues once again were  far below projections,  and
only  reached a level just equal to  the amount of expenditures. Thus, the State
continued to carry its $2.8 billion budget deficit at June 30, 1993.
 
    The 1993-94  Budget  Act was  similar  to the  prior  year, in  reliance  on
expenditure  cuts  and an  additional $2.6  billion transfer  of costs  to local
government, particularly counties. A major feature of the budget was a  two-year
plan  to eliminate the accumulated deficit  by borrowing into the 1994-95 fiscal
year. With  the recession  still continuing  longer than  expected, the  1994-95
Governor's Budget now projects that in the 1993-94 Fiscal Year, the General Fund
will  have $900 million  less revenue and $800  million higher expenditures than
budgeted. As  a result  revenues will  only exceed  expenditures by  about  $400
million.  If this projection is  met, it will be  the first operating surplus in
four years;  however, some  budget analysts  outside the  Department of  Finance
project revenues in the balance of 1993-94 will not even meet the revised, lower
projection.  In addition,  the General  Fund may  have some  unplanned costs for
relief related to the January 17, 1994 Northridge earthquake.
 
    The State has implemented  its short-term borrowing as  part of the  deficit
elimination  plan,  and has  also borrowed  additional sums  to cover  cash flow
shortfalls in the spring  of 1994, for  a total of $3.2  billion, coming due  in
July  and  December,  1994. Repayment  of  these short-term  notes  will require
additional borrowing, as  the State's  cash position continues  to be  adversely
affected.
 
    The  Governor's 1994-95 Budget proposal recognizes  the need to bridge a gap
of around $5 billion by June 30, 1995. Over $3.1 billion of this amount is being
requested from the federal government  as increased aid, particularly for  costs
associated  with  incarcerating,  educating  and  providing  health  and welfare
services to undocumented immigrants. However, President Clinton has not included
these costs in his proposed  Fiscal 1995 Budget. The rest  of the budget gap  is
proposed  to be closed with  expenditure cuts and projected  $600 million of new
revenue assuming the State wins a tax case presently pending in the U.S. Supreme
Court. Thus the State  will once again face  significant uncertainties and  very
difficult  choices in the 1994-95 budget, as tax increases are unlikely and many
cuts and budget adjustments have been made in the past three years.
 
    The State's  severe  financial difficulties  for  the current  and  upcoming
budget   years  will  result  in  continued   pressure  upon  almost  all  local
governments, particularly school  districts and counties  which depend on  State
aid.  Despite efforts in recent years  to increase taxes and reduce governmental
expenditures, there can be no assurance that the State will not face budget gaps
in the future.
 
    BOND RATING.    State general obligation bonds  are currently rated "Aa"  by
Moody's  and "A+" by S&P.  Both of these ratings  were reduced from "AAA" levels
which the  State held  until late  1991. There  can be  no assurance  that  such
ratings  will  be  maintained  in  the  future.  It  should  be  noted  that the
creditworthiness of  obligations  issued  by local  California  issuers  may  be
unrelated  to  the  creditworthiness  of  obligations  issued  by  the  State of
California, and
 
                                       14
<PAGE>
that there is no  obligation on the part  of the State to  make payment on  such
local obligations in the event of default.
 
    LEGAL  PROCEEDINGS.   The  State is  involved  in certain  legal proceedings
(described in the State's recent financial statements) that, if decided  against
the  State, may require the State to make significant future expenditures or may
substantially impair revenues. The U.S. Supreme Court has granted review of  two
cases   challenging  California's  "unitary"   method  of  taxing  multinational
corporations. Although this taxing method has  since been changed, if the  State
loses these cases, it could be liable for tax refunds and lost receipts of taxes
assessed totalling $3.5 billion to $4 billion.
 
OBLIGATIONS OF OTHER ISSUERS
 
    OTHER  ISSUERS OF  CALIFORNIA MUNICIPAL OBLIGATIONS.  There are  a number of
state agencies, instrumentalities and political  subdivisions of the State  that
issue  Municipal Obligations, some  of which may  be conduit revenue obligations
payable from  payments from  private borrowers.  These entities  are subject  to
various  economic  risks  and  uncertainties,  and  the  credit  quality  of the
securities issued by them may vary  considerably from the credit quality of  the
obligations backed by the full faith and credit of the State.
 
    STATE  ASSISTANCE.  Property  tax  revenues  received  by  local governments
declined more than 50%  following passage of  Proposition 13. Subsequently,  the
California Legislature enacted measures to provide for the redistribution of the
State's  General Fund  surplus to  local agencies,  the reallocation  of certain
State revenues  to local  agencies and  the assumption  of certain  governmental
functions  by the  State to  assist municipal  issuers to  raise revenues. Total
local assistance (including public schools)  accounted for approximately 75%  of
General  Fund expenditures, including  the effect of  implementing reductions in
certain aid programs. To reduce State General Fund support for school districts,
the 1992-93 and 1993-94  Budget Acts caused local  governments to transfer  $3.9
billion  of property tax revenues to  school districts, representing loss of all
of the post-Proposition 13 "bailout" aid.  The largest share of these  transfers
came  from  counties,  and  the  balance  from  cities,  special  districts  and
redevelopment agencies.  In order  to make  up this  shortfall, the  Legislature
proposed  and voters approved dedicating  0.5% of the sales  tax to counties and
cities for public safety purposes. In addition, the Legislature has changed laws
to relieve local governments of certain mandates, allowing them to reduce costs.
 
    To the  extent  the  State  should  be  constrained  by  its  Article  XIIIB
appropriations  limit, or its obligation to  conform to Proposition 98, or other
fiscal considerations,  the absolute  level, or  the rate  of growth,  of  State
assistance to local governments may be reduced. Any such reductions in State aid
could  compound the serious fiscal constraints already experienced by many local
governments, particularly counties. The Richmond Unified School District (Contra
Costa County) entered  bankruptcy proceedings  in May 1991  but the  proceedings
have been dismissed.
 
    ASSESSMENT  BONDS.  California  Municipal Obligations  which  are assessment
bonds may be adversely affected by a general decline in real estate values or  a
slowdown in real estate sales activity. In many cases, such bonds are secured by
land  which  is  undeveloped at  the  time  of issuance  but  anticipated  to be
developed within a few years after issuance.  In the event of such reduction  or
slowdown,  such development may not occur  or may be delayed, thereby increasing
the risk of a  default on the  bonds. Because the  special assessments or  taxes
securing  these  bonds are  not  the personal  liability  of the  owners  of the
property assessed, the lien on the property is the only security for the  bonds.
Moreover, in most cases
 
                                       15
<PAGE>
the  issuer of these bonds is not required  to make payments on the bonds in the
event of  delinquency  in the  payment  of  assessments or  taxes,  except  from
amounts, if any, in a reserve fund established for the bonds.
 
    CALIFORNIA  LONG-TERM LEASE OBLIGATIONS.  Certain California long-term lease
obligations, though typically payable from the general fund of the municipality,
are subject to "abatement" in the event the facility being leased is unavailable
for beneficial use  and occupancy  by the municipality  during the  term of  the
lease. Abatement is not a default, and there may be no remedies available to the
holders  of  the  certificates  evidencing the  lease  obligation  in  the event
abatement occurs. The  most common cases  of abatement are  failure to  complete
construction  of the facility  before the end  of the period  during which lease
payments have been  capitalized and  uninsured casualty losses  to the  facility
(E.G., due to earthquake). In the event abatement occurs with respect to a lease
obligation,  lease  payments  may  be interrupted  (if  all  available insurance
proceeds and reserves are exhausted) and  the certificates may not be paid  when
due.
 
    Several  years  ago the  Richmond Unified  School District  (the "District")
entered into a  lease transaction in  which certain existing  properties of  the
District  were sold and leased back in  order to obtain funds to cover operating
deficits. Following a fiscal crisis in which the District's finances were  taken
over  by  a State  receiver  (including a  brief  period under  bankruptcy court
protection), the  District  failed  to  make  rental  payments  on  this  lease,
resulting  in  a lawsuit  by the  Trustee for  the Certificate  of Participation
holders, in  which the  State was  a named  defendant (on  the grounds  that  it
controlled  the District's  finances). One of  the defenses raised  in answer to
this lawsuit was  the invalidity of  the District's lease.  The trial court  has
upheld  the validity of the lease and the case has been settled. Any judgment in
a future case against the position asserted by the Trustee in the Richmond  case
may  have adverse  implications for  lease transactions  of a  similar nature by
other California entities.
 
    OTHER CONSIDERATIONS.  The repayment  of industrial  development  securities
secured by real property may be affected by California laws limiting foreclosure
rights  of creditors. Securities backed by health care and hospital revenues may
be affected by  changes in  State regulations governing  cost reimbursements  to
health  care providers under Medi-Cal  (the State's Medicaid program), including
risks  related  to  the  policy  of  awarding  exclusive  contracts  to  certain
hospitals.
 
    Limitations  on  AD  VALOREM  property taxes  may  particularly  affect "tax
allocation" bonds issued  by California redevelopment  agencies. Such bonds  are
secured  solely by the increase in assessed valuation of a redevelopment project
area after  the start  of redevelopment  activity. In  the event  that  assessed
values  in the redevelopment  project decline (E.G., because  of a major natural
disaster such as an earthquake), the  tax increment revenue may be  insufficient
to  make principal and  interest payments on  these bonds. Both  Moody's and S&P
suspended ratings  on California  tax allocation  bonds after  the enactment  of
Articles XIIIA and XIIIB, and only resumed such ratings on a selective basis.
 
    Proposition  87, approved  by California voters  in 1988,  requires that all
revenues produced by a tax rate increase go directly to the taxing entity  which
increased  such tax rate to repay that entity's general obligation indebtedness.
As a result, redevelopment  agencies (which, typically, are  the issuers of  tax
allocation securities) no longer receive an increase in tax increment when taxes
on  property in  the project area  are increased to  repay voter-approved bonded
indebtedness.
 
                                       16
<PAGE>
    The effect of these  various constitutional and  statutory changes upon  the
ability of California municipal securities issuers to pay interest and principal
on  their obligations remains unclear. Furthermore, other measures affecting the
taxing or spending authority of California or its political subdivisions may  be
approved  or enacted in  the future. Legislation  has been or  may be introduced
which would modify  existing taxes  or other revenue-raising  measures or  which
either  would further limit  or, alternatively, would  increase the abilities of
state and local governments to impose  new taxes or increase existing taxes.  It
is  not presently possible to  predict the extent to  which any such legislation
will be enacted. Nor  is it presently  possible to determine  the impact of  any
such  legislation  on California  Municipal Obligations  in  which the  Fund may
invest, future  allocations  of  state  revenues to  local  governments  or  the
abilities  of state or  local governments to  pay the interest  on, or repay the
principal of, such California Municipal Obligations.
 
    Substantially all of California is within an active geologic region  subject
to major seismic activity. Any California Municipal Obligation in the California
Insured  Trust  could be  affected  by an  interruption  of revenues  because of
damaged facilities, or, consequently, income tax deductions for casualty  losses
or  property tax assessment reductions.  Compensatory financial assistance could
be constrained by  the inability of  (i) an issuer  to have obtained  earthquake
insurance  coverage  at reasonable  rates;  (ii) an  insurer  to perform  on its
contracts of insurance in the event  of widespread losses; or (iii) the  Federal
or  State  government to  appropriate sufficient  funds within  their respective
budget limitations.
 
    On January 17, 1994, a major  earthquake with an estimated magnitude of  6.8
on  the Richter scale struck the  Los Angeles area, causing significant property
damage to public and private facilities, presently estimated at $15-20  billion.
While  over $9.5 billion of  federal aid, and a  projected $1.9 billion of State
aid, plus insurance proceeds,  will reimburse much of  that loss, there will  be
some  ultimate loss of wealth and income in  the region, in addition to costs of
the  disruption  caused  by  the  event.  Short-term  economic  projections  are
generally  neutral, as the infusion  of aid will restore  billions of dollars to
the local economy within a few  months; already the local construction  industry
has  picked up. Although the earthquake  will hinder recovery from the recession
in Southern California, already hard-hit,  its long-term impact is not  expected
to  be material in the context of the  overall wealth of the region. Almost five
years after the event, there are few  remaining effects of the 1989 Loma  Prieta
earthquake  in northern  California (which,  however, caused  less severe damage
than Northridge).
 
                                       17
<PAGE>
CALIFORNIA TAXABLE ESTIMATED CURRENT RETURN TABLE
 
    The following tables show the approximate taxable estimated current  returns
for  individuals  that are  equivalent to  tax-exempt estimated  current returns
under combined Federal and  state taxes, using  published 1994 marginal  Federal
tax  rates and marginal state tax rates  currently available and scheduled to be
in  effect.  The  tables  incorporate  increased  tax  rates  for  higher-income
taxpayers  that were  included in  the Revenue  Reconciliation Act  of 1993. For
cases in which more than one state  bracket falls within a Federal bracket,  the
highest  state bracket is combined with  the Federal bracket. The combined state
and Federal tax  brackets shown  reflect the fact  that state  tax payments  are
currently  deductible for Federal  tax purposes. The  tables illustrate what you
would have to  earn on  taxable investments  to equal  the tax-exempt  estimated
current  return for your income  tax bracket. A taxpayer's  marginal tax rate is
affected by both his taxable income  and his adjusted gross income. Locate  your
adjusted  gross and  your taxable  income (which  is your  adjusted gross income
reduced by any deductions and exemptions), then locate your tax bracket based on
joint or single  tax filing.  Read across  to the  equivalent taxable  estimated
current return you would need to match the tax-free income.
 
 COMBINED MARGINAL TAX RATES FOR JOINT TAXPAYERS WITH FOUR PERSONAL EXEMPTIONS
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL
    FEDERAL      ADJUSTED      COMBINED
    TAXABLE        GROSS      STATE* AND                   TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME        FEDERAL       --------------------------------------------------------------
   (1,000'S)     (1,000'S)     TAX RATE1      5.50%   5.75%   6.00%   6.25%   6.50%   6.75%   7.00%   7.25%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 38.0 $     0-111.8      20.0   %     6.88    7.19    7.50    7.81    8.13    8.44    8.75    9.06
    38.0- 91.9       0-111.8      34.5         8.40    8.78    9.16    9.54    9.92   10.31   10.69   11.07
                 111.8-167.7      35.5         8.53    8.91    9.30    9.69   10.08   10.47   10.85   11.24
    91.9-140.0       0-111.8      37.5         8.80    9.20    9.60   10.00   10.40   10.80   11.20   11.60
                 111.8-167.7      38.5         8.94    9.35    9.76   10.16   10.57   10.98   11.38   11.79
                 167.7-214.9      40.5         9.24    9.66   10.08   10.50   10.92   11.34   11.76   12.18
   140.0-214.9   111.8-167.7      43.0         9.65   10.09   10.53   10.96   11.40   11.84   12.28   12.72
                 167.7-214.9      45.5        10.09   10.55   11.01   11.47   11.93   12.39   12.84   13.30
                 214.9-239.9      46.5        10.28   10.75   11.21   11.68   12.15   12.62   13.08   13.55
                 239.9-290.2      46.0        10.19   10.65   11.11   11.57   12.04   12.50   12.96   13.43
                  Over 290.2      43.5   2     9.73   10.18   10.62   11.06   11.50   11.95   12.39   12.83
   214.9-250.0   167.7-214.9      46.0        10.19   10.65   11.11   11.57   12.04   12.50   12.96   13.43
                 214.9-239.9      47.0        10.38   10.85   11.32   11.79   12.26   12.74   13.21   13.68
                 239.9-290.2      46.5        10.28   10.75   11.21   11.68   12.15   12.62   13.08   13.55
                  Over 290.2      44.0   2     9.82   10.27   10.71   11.16   11.61   12.05   12.50   12.95
   250.0-429.9   239.9-290.2      50.0        11.00   11.50   12.00   12.50   13.00   13.50   14.00   14.50
                  Over 290.2      47.0   3    10.38   10.85   11.32   11.79   12.26   12.74   13.21   13.68
    Over 429.9    Over 290.2      47.5   3    10.48   10.95   11.43   11.90   12.38   12.86   13.33   13.81
</TABLE>
 
                                       18
<PAGE>
  COMBINED MARGINAL TAX RATES FOR SINGLE TAXPAYERS WITH ONE PERSONAL EXEMPTION
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL
    FEDERAL      ADJUSTED      COMBINED
    TAXABLE        GROSS      STATE* AND                   TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME        FEDERAL       --------------------------------------------------------------
   (1,000'S)     (1,000'S)     TAX RATE1      5.50%   5.75%   6.00%   6.25%   6.50%   6.75%   7.00%   7.25%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 22.8 $     0-107.5      20.0   %     6.88    7.19    7.50    7.81    8.13    8.44    8.75    9.06
    22.8- 55.1       0-107.5      34.5         8.40    8.78    9.16    9.54    9.92   10.31   10.69   11.07
    55.1-107.5       0-107.5      37.5         8.80    9.20    9.60   10.00   10.40   10.80   11.20   11.60
                 107.5-111.8      38.0         8.87    9.27    9.68   10.08   10.48   10.89   11.29   11.69
                 111.8-132.5      39.5         9.09    9.50    9.92   10.33   10.74   11.16   11.57   11.98
                 132.5-234.3      39.0         9.02    9.43    9.84   10.25   10.66   11.07   11.48   11.89
   107.5-115.0       0-107.5      38.0         8.87    9.27    9.68   10.08   10.48   10.89   11.29   11.69
                 107.5-111.8      38.5         8.94    9.35    9.76   10.16   10.57   10.98   11.38   11.79
                 111.8-132.5      40.0         9.17    9.58   10.00   10.42   10.83   11.25   11.67   12.08
                 132.5-234.3      39.5         9.09    9.50    9.92   10.33   10.74   11.16   11.57   11.98
   115.0-214.9   111.8-132.5      44.5         9.91   10.36   10.81   11.26   11.71   12.16   12.61   13.06
                 132.5-234.3      44.5         9.91   10.36   10.81   11.26   11.71   12.16   12.61   13.06
                  Over 234.3      44.0   2     9.82   10.27   10.71   11.16   11.61   12.05   12.50   12.95
   214.9-250.0   132.5-234.3      45.0        10.00   10.45   10.91   11.36   11.82   12.27   12.73   13.18
                  Over 234.3      44.5   2     9.91   10.36   10.81   11.26   11.71   12.16   12.61   13.06
    Over 250.0    Over 234.3      47.5   3    10.48   10.95   11.43   11.90   12.38   12.86   13.33   13.81
<FN>
- ------------------
    *  The State tax rates assumed take into account the adjustment  of tax brackets based on changes in the Consumer Price Index
for 1994.
      1 The table reflects the effect of the limitations  on itemized deductions and the deduction for personal exemptions.  They
were  designed to phase out certain benefits of these deductions for higher income taxpayers. These limitations, in effect, raise
the current maximum marginal Federal tax rate to approximately 44.0  percent for taxpayers filing a joint return and entitled  to
four  personal exemptions and to  approximately 41.0 percent for taxpayers  filing a single return  entitled to only one personal
exemption. These limitations are  subject to certain maximums,  which depend on  the number of exemptions  claimed and the  total
amount  of the taxpayer's itemized  deductions. For example, the limitation  on itemized deductions will  not cause a taxpayer to
lose more than 80% of his allowable itemized deductions,  with certain exceptions. The table also reflects California income  tax
laws  that increase state income tax rates for high income taxpayers,  limit itemized deductions and phase out the benefit of the
personal exemption credit and the dependent exemption credit in a manner similar to Federal tax law.
      2 Federal tax rate reverts to 36.0% and the state tax rate reverts to the applicable stated maximum rate after the 80%  cap
on the limitation on itemized deductions, under federal or state law, as appropriate has been met.
      3 Federal tax rate reverts to 39.6% after the 80% cap on the limitation on itemized deductions has been met.
</TABLE>
 
    A  comparison of tax-free  and equivalent taxable  estimated current returns
with the returns on  various taxable investments is  one element to consider  in
making  an  investment  decision. The  Sponsor  may  from time  to  time  in its
advertising and sales materials  compare the then  current estimated returns  on
the Trust and returns over specified periods on other similar Nuveen Trusts with
returns  on taxable investments such as corporate or U.S. Government bonds, bank
CD's and  money  market  accounts or  money  market  funds, each  of  which  has
investment  characteristics  that  may  differ from  those  of  the  Trust. U.S.
Government bonds, for example, are  backed by the full  faith and credit of  the
U.S. Government and bank CD's and money market accounts are insured by an agency
of  the federal government. Money market accounts and money market funds provide
stability of principal, but pay interest  at rates that vary with the  condition
of  the short-term debt market. The  investment characteristics of the Trust are
described more fully elsewhere in this Prospectus.
 
                                       19
<PAGE>
   
NUVEEN TAX-EXEMPT UNIT TRUST
SCHEDULE OF INVESTMENTS AT DATE OF DEPOSIT
NOVEMBER 22, 1994
CALIFORNIA INSURED TRUST 236
(SERIES 768)
    
 
<TABLE>
<CAPTION>
                                                                                          Ratings(3)           Trustee's
                                                                      Optional       ---------------------   Determination
 Aggregate        Name of Issuer and Title of Issue Represented      Redemption       Standard                of Offering
  Principal        by Sponsor's Contracts to Purchase Bonds(1)      Provisions(2)     & Poor's    Moody's      Price(4)
<C>          <C> <S>                                              <C>                <C>         <C>        <C>
- ---------------------------------------------------------------------------------------------------------------------------
$   500,000      California Statewide Communities Development        2004 at 102        AAA         Aaa     $       426,775
                   Authority, Certificates of Participation,
                   Sharp Healthcare Obligated Group, 6.00% Due
                   8/15/24.
    500,000      State Public Works Board of the State of            2004 at 102        AAA         Aaa             491,295
                   California, Lease Revenue Bonds (Department
                   of Corrections), 1994 Series A (California
                   State Prison-Monterey County (Soledad II)),
                   7.00% Due 11/1/19.
    500,000      Castaic Lake Water Agency (California),             2004 at 102        AAA         Aaa             447,585
                   Refunding Revenue Certificates of
                   Participation (Water System Improvement
                   Projects), Series 1994A, 6.30% Due 8/1/20.
    500,000      Department of Water and Power of The City of        2003 at 102        AAA         Aaa             415,245
                   Los Angeles (California), Electric Plant
                   Refunding Revenue Bonds, Issue of 1993,
                   5.875% Due 9/1/30.
    500,000      Otay Water District (California), Water Revenue     2004 at 102        AAA         Aaa             409,375
                   Certificates of Participation (1993 Water
                   Facilities Project), 5.70% Due 9/1/23.
    500,000      San Diego Regional Building Authority               2003 at 102        AAA         Aaa             410,540
                   (California), Refunding Lease Revenue Bonds,
                   Series 1993A (San Miguel Consolidated Fire
                   Protection District Project), 5.65% Due
                   1/1/20.
    500,000      Commonwealth of Puerto Rico, Public Improvement   2004 at 101 1/2      AAA         Aaa             466,315
                   Bonds of 1994 (General Obligation Bonds),
                   6.50% Due 7/1/23.
- -----------                                                                                                 ---------------
$ 3,500,000                                                                                                 $     3,067,130
- -----------                                                                                                 ---------------
- -----------                                                                                                 ---------------
</TABLE>
 
See Notes to Schedules of Investments, page 47.
 
                                       20
<PAGE>
   
COLORADO INSURED TRUST 54
    
 
   
    The  Portfolio of Colorado Insured Trust 54 consists of 7 obligations issued
by entities located in Colorado and  one obligation issued by an entity  located
in  the Territory of Puerto Rico. Two Bonds in the Trust are general obligations
of the governmental entities  issuing them and are  backed by the taxing  powers
thereof.  Six Bonds in the  Trust are payable as  to principal and interest from
the income of  a specific  project or  authority and  are not  supported by  the
issuer's power to levy taxes. The sources of payment for these Bonds are divided
as  follows: College  and University Revenue,  1; Electrical  System Revenue, 1;
Health Care Facility  Revenue, 3;  Combination Utility  Revenue, 1.  All of  the
Bonds  in the Trust, as insured, are  rated AAA by Standard & Poor's Corporation
and Aaa by Moody's Investors Service, Inc.
    
 
   
    At the Date of Deposit,  the average maturity of  the Bonds in the  Colorado
Insured  Trust is 25.7  years. The average maturity  of the Bonds  in a Trust is
calculated based upon the stated maturities of the Bonds in such Trust (or, with
respect to Bonds for  which funds or  securities have been  placed in escrow  to
redeem such Bonds on a stated call date, based upon such call date). The average
maturity  of the Bonds in a Trust may  increase or decrease from time to time as
Bonds mature or are called or sold.
    
 
   
    Approximately 18.7% of the  aggregate principal amount of  the Bonds in  the
Trust (accounting for approximately 15.8% of the aggregate offering price of the
Bonds)    are   original    issue   discount    bonds.   See    "GENERAL   TRUST
INFORMATION--ORIGINAL ISSUE  DISCOUNT  BONDS  AND STRIPPED  OBLIGATIONS"  for  a
discussion  of the  characteristics of  such bonds  and of  the risks associated
therewith.
    
 
    Approximately 43% of  the aggregate  principal amount  of the  Bonds in  the
Trust  consists of obligations  of issuers whose  revenues are primarily derived
from services provided by hospitals or other health care facilities.
 
    For a discussion of  the risks associated with  investments in the bonds  of
various issuers, see "General Trust Information" in this section.
 
   
    The Sponsor entered into contracts to acquire the Bonds between November 18,
1994  and November 21, 1994. The  following summarizes certain information about
the Bonds as of the business day prior to the Date of Deposit:
    
 
<TABLE>
<CAPTION>
                                                                  DIFFERENCE BETWEEN TRUSTEE'S
                                                               DETERMINATION OF OFFERING PRICE AND
   COST TO    PROFIT (OR LOSS)   ANNUAL INTEREST   BID PRICE              THE BID PRICE
   SPONSOR       TO SPONSOR      INCOME TO TRUST    OF BONDS       (AS % OF PRINCIPAL AMOUNT)
  ----------  -----------------  ----------------  ----------  -----------------------------------
  <S>         <C>                <C>               <C>         <C>
  $3,085,289       $14,831           $213,531      $3,083,245                 .48%
</TABLE>
 
    Neither  cost  to  Sponsor  nor   profit  (or  loss)  to  Sponsor   reflects
underwriting  profits or losses received or  incurred by the Sponsor through its
participation  in  underwriting  syndicates.  An  underwriter  or   underwriting
syndicate  purchases bonds  from the issuer  on a negotiated  or competitive bid
basis as principal with  the motive of  marketing such bonds  to investors at  a
profit.  The Sponsor did not participate as  either the sole underwriter or as a
manager or member of a syndicate that  acted as the original underwriter of  any
of the Bonds.
 
   
    Unitholders  may elect  to have  interest distributions  made on  a monthly,
quarterly or semi-annual basis. The interest on the Bonds initially deposited in
the Colorado Insured Trust, less estimated  expenses, is estimated to accrue  at
the rate of $.01646 per Unit per day under the semi-annual plan of distribution,
$.01641 per Unit per day under the
    
 
                                       21
<PAGE>
   
quarterly  plan of distribution and  $.01632 per Unit per  day under the monthly
plan of  distribution. It  is anticipated  that  the amount  of interest  to  be
distributed per Unit in each year under each plan of distribution will initially
be  substantially equal to the Estimated Net Annual Interest Income per Unit for
that plan.
    
 
    Details of interest  distributions per  Unit of the  Colorado Insured  Trust
under  the various plans appear in the  following table based upon estimated Net
Annual Interest Income at the Date of Deposit:
 
<TABLE>
<CAPTION>
                                                                                                                       NORMAL
                                                                                                                   DISTRIBUTIONS
COLORADO INSURED TRUST                                                  1995                                          PER YEAR
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        1/1            2/1            5/1            8/1           11/1
Distribution Date.....................       1/15           2/15           5/15           8/15          11/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .6364(1)                                                               $  5.8772
                                                              --------   $.4896 every month   --------
Quarterly Distribution Plan...........  $   .6364(1)   $   .4923(2)   $  1.4769      $  1.4769      $  1.4769      $  5.9092
Semi-Annual Distribution Plan.........  $   .6364(1)                  $  1.9752(3)                  $  2.9628      $  5.9282
- ---------------------------------------------------------------------------------------------------------------------------------
 
<FN>
 * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May  1,
   August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1)  The first distribution will be paid to all Unitholders,  regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The  second distribution  under the  quarterly  distribution plan  represents a  1-month distribution;  subsequent  quarterly
    distributions will be regular 3-month distributions.
(3)  The second distribution  under the semi-annual distribution  plan represents a  4-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
    The accrual amounts set forth above, and  in turn the amount of interest  to
be  distributed annually per Unit, will  generally change as Bonds are redeemed,
mature or are sold or as fees and expenses increase or decrease.
 
TAX STATUS--COLORADO INSURED TRUST
 
    For a discussion  of the  Federal tax status  of income  earned on  Colorado
Insured Trust Units, see Section 11.
 
    In  the opinion of Sherman & Howard  L.L.C., special Colorado counsel to the
Series, under existing law:
 
        A Colorado Insured Trust will  consist of obligations which were  issued
    by  the State  of Colorado  or its political  subdivisions or  by the United
    States or possessions of the United States including Puerto Rico, the Virgin
    Islands and Guam ("Colorado Bonds").
 
        Because Colorado income  tax law is  based upon the  Federal law and  in
    light  of the opinion of  Chapman and Cutler, the  Colorado Insured Trust is
    not an association taxable as a corporation for purposes of Colorado  income
    taxation.
 
        With  respect  to  Colorado  Unitholders, in  view  of  the relationship
    between Federal  and  Colorado  tax computations  described  above  and  the
    opinion of Chapman and Cutler referred to above:
 
        Each Colorado Unitholder will be treated as owning a share of each asset
    of  the  Colorado Insured  Trust for  Colorado income  tax purposes,  in the
    proportion that the number of Units of  such Trust held by him bears to  the
    total  number of  outstanding Units of  the Colorado Insured  Trust, and the
    income of the Colorado Insured Trust will
 
                                       22
<PAGE>
    therefore be  treated  as  the  income of  each  Colorado  Unitholder  under
    Colorado law in the proportion described.
 
        Interest  on Colorado Bonds that would not be subject to Colorado income
    tax or Colorado  alternative minimum tax  when paid directly  to a  Colorado
    Unitholder will not be subject to Colorado income tax or alternative minimum
    tax  when  received by  the Colorado  Insured Trust  and attributed  to such
    Colorado Unitholder and when distributed to such Colorado Unitholder.
 
        Any proceeds paid under an insurance policy issued to the issuer of  the
    Colorado  Bonds involved, to the Depositor  prior to deposit of the Colorado
    Bonds in the Colorado Insured Trust, or to the Colorado Insured Trust, which
    proceeds represent maturing interest on  defaulted Colorado Bonds and  which
    proceeds  would not be subject to Colorado income tax or alternative minimum
    tax when  paid directly  to a  Colorado Unitholder  will not  be subject  to
    Colorado  income and alternative  minimum tax when  received by the Colorado
    Insured  Trust  and  attributed  to   such  Colorado  Unitholder  and   when
    distributed to such Colorado Unitholder.
 
        Each  Colorado Unitholder will realize gain  or loss taxable in Colorado
    when the Colorado  Insured Trust  disposes of  a Colorado  Bond (whether  by
    sale,  exchange, redemption  or payment  at maturity)  or when  the Colorado
    Unitholder redeems or sells Units at a price that differs from original cost
    as adjusted for  amortization of bond  discount or premium  and other  basis
    adjustments (including any basis reduction that may be required to reflect a
    Colorado  Unitholder's share of interest, if any, accruing on Colorado Bonds
    during the interval  between the Colorado  Unitholder's settlement date  and
    the date such Colorado Bonds are delivered to the Colorado Insured Trust, if
    later).
 
        Tax cost reduction requirements relating to amortization of bond premium
    may, under some circumstances, result in Colorado Unitholders realizing gain
    taxable  in Colorado  when their  Units are sold  or redeemed  for an amount
    equal to or less than their original cost.
 
        If  interest  on  indebtedness  incurred  or  continued  by  a  Colorado
    Unitholder to purchase Units in the Colorado Insured Trust is not deductible
    for  Federal income  tax purposes,  it will  not be  deductible for Colorado
    income tax purposes.
 
ECONOMIC FACTORS--COLORADO
 
   
    RESTRICTIONS  ON  APPROPRIATIONS  AND  REVENUES.    The  State  Constitution
requires  that expenditures  for any  fiscal year  not exceed  revenues for such
fiscal year.  By statute,  the amount  of General  Fund revenues  available  for
appropriation  is  based  upon  revenue  estimates  which,  together  with other
available resources,  must exceed  annual appropriations  by the  amount of  the
unappropriated   reserve  (the  "Unappropriated  Reserve").  The  Unappropriated
Reserve requirement for fiscal years 1991, 1992 and 1993 was set at 3% of  total
appropriations  from the General Fund. For fiscal years 1994 and thereafter, the
Unappropriated  Reserve  retirement   is  set   at  4%.  In   addition  to   the
Unappropriated  Reserve, a constitutional amendment  approved by Colorado voters
in 1992  requires the  State and  each  local government  to reserve  a  certain
percentage  of  its fiscal  year spending  (excluding  bonded debt  service) for
emergency use (the "Emergency Reserve"). The minimum Emergency Reserve is set at
2% for  1994  and  3% for  1995  and  later  years. For  fiscal  year  1992  and
thereafter, General Fund appropriations are also limited by statute to an amount
equal  to  the  cost  of performing  certain  required  reappraisals  of taxable
property plus an amount
    
 
                                       23
<PAGE>
equal to the lesser of (i) five percent of Colorado personal income or (ii) 106%
of the total  General Fund  appropriations for  the previous  fiscal year.  This
restriction does not apply to any General Fund appropriations which are required
as a result of a new federal law, a final state or federal court order or moneys
derived  from the increase in the rate or amount of any tax or fee approved by a
majority of the registered electors of the State voting at any general election.
In addition, the statutory limit on the level of General Fund appropriations may
be exceeded for  a given  fiscal year  upon the  declaration of  a State  fiscal
emergency by the State General Assembly.
 
   
    The  1992 fiscal year ending General  Fund balance was $133.3 million, which
was $49.1 million over the  Unappropriated Reserve requirement. The 1993  fiscal
year  ending General Fund balance was $326.6 million, or $196.7 million over the
required Unappropriated Reserve and Emergency  Reserve. Based on June 20,  1994,
estimates,  the 1994 fiscal year  ending General Fund balance  is expected to be
$337.7 million, or $224.3 million  over the required Unappropriated Reserve  and
Emergency Reserve.
    
 
   
    On  November 3, 1992, voters in Colorado approved a constitutional amendment
(the "Amendment") which,  in general,  became effective December  31, 1992,  and
could  restrict  the ability  of  the State  and  local governments  to increase
revenues and impose  taxes. The  Amendment applies to  the State  and all  local
governments, including home rule entities ("Districts"). Enterprises, defined as
government-owned  businesses  authorized to  issue  revenue bonds  and receiving
under 10%  of  annual  revenue in  grants  from  all Colorado  state  and  local
governments combined, are excluded from the provisions of the Amendment.
    
 
   
    The  provisions  of  the Amendment  are  unclear and  will  probably require
judicial interpretation. Among other provisions, beginning November 4, 1992, the
Amendment requires voter approval prior to  tax increases, creation of debt,  or
mill levy or valuation for assessment ratio increases. The Amendment also limits
increases  in  government  spending  and  property  tax  revenues  to  specified
percentages. The Amendment requires that District property tax revenues yield no
more than  the prior  year's  revenues adjusted  for inflation,  voter  approved
changes  and (except with  regard to school districts)  local growth in property
values according to a formula set  forth in the Amendment. School districts  are
allowed  to adjust tax levies for changes in student enrollment. Pursuant to the
Amendment, local government spending is to be limited by the same formula as the
limitation  for  property  tax  revenues.  The  Amendment  limits  increases  in
expenditures  from the State  General Fund and program  revenues (cash funds) to
the growth in inflation  plus the percentage change  in State population in  the
prior  calendar  year. The  bases for  initial spending  and revenue  limits are
fiscal year 1992 spending and 1991  property taxes collected in 1992. The  bases
for spending and revenue limits for fiscal year 1994 and later years will be the
prior  fiscal year's spending and property taxes collected in the prior calendar
year. Debt service  changes, reductions and  voter-approved revenue changes  are
excluded  from  the  calculation  bases. The  Amendment  also  prohibits  new or
increased real property transfer  tax rates, new State  real property taxes  and
local District income taxes.
    
 
   
    Litigation concerning several issues relating to the Amendment is pending in
the  Colorado  courts. The  litigation deals  with  three principal  issues: (i)
whether Districts  can increase  mill  levies to  pay  debt service  on  general
obligation  bonds without  obtaining voter  approval; (ii)  whether a multi-year
lease-purchase agreement subject to annual appropriations is an obligation which
requires  voter   approval   prior   to  execution   of   the   agreement;   and
    
 
                                       24
<PAGE>
   
(iii)  what constitutes an "enterprise" which is excluded from the provisions of
the Amendment.  In  September,  1994,  the  Colorado  Supreme  Court  held  that
Districts  can increase  mill levies to  pay debt service  on general obligation
bonds issued after  the effective  date of the  Amendment; litigation  regarding
mill  levy  increases  to  pay  general obligation  bonds  issued  prior  to the
Amendment is still pending. Various cases addressing the remaining issues are at
different stages  in  the trial  and  appellate  process. The  outcome  of  such
litigation cannot be predicted at this time.
    
 
   
    According  to the COLORADO ECONOMIC PERSPECTIVE, FOURTH QUARTER, FY 1993-94,
JUNE 20,  1994  (the  "Economic  Report"),  inflation  for  1992  was  3.8%  and
population  grew  at  the  rate  of 2.8%  in  Colorado.  Accordingly,  under the
Amendment, increases in State expenditures during  the 1994 fiscal year will  be
limited  to 6.6% over  expenditures during the 1993  fiscal year. The limitation
for the 1995 fiscal year is projected  to be 7.1%, based on projected  inflation
of  4.2% for 1993 and projected population  growth of 2.9% during 1993. The 1993
fiscal year is the base year for calculating the limitation for the 1994  fiscal
year.  For the 1993 fiscal year, General Fund revenues totalled $3,443.3 million
and program revenues (cash funds) totalled $1,617.6 million, resulting in  total
estimated  base revenues of  $5,060.9 million. Expenditures  for the 1994 fiscal
year, therefore, cannot exceed $5,394.9  million. However, the 1994 fiscal  year
General Fund and program revenues (cash funds) are projected to be only $5,242.8
million,  or $152.1  million less than  expenditures allowed  under the spending
limitation.
    
 
    There is also a statutory restriction  on the amount of annual increases  in
taxes  that  the  various  taxing jurisdictions  in  Colorado  can  levy without
electoral approval.  This restriction  does not  apply to  taxes levied  to  pay
general obligation debt.
 
   
    STATE  FINANCES.    As  the  State  experienced  revenue  shortfalls  in the
mid-1980s, it adopted various  measures, including impoundment  of funds by  the
Governor,  reduction  of appropriations  by  the General  Assembly,  a temporary
increase in the  sales tax, deferral  of certain tax  reductions and  inter-fund
borrowings. On a GAAP basis, the State had unrestricted General Fund balances at
June  30 of approximately $100.3 million in  fiscal year 1988, $134.4 million in
fiscal year 1989, $116.6  million in fiscal year  1990, $16.3 million in  fiscal
year 1991, $133.3 million in fiscal year 1992, and $326.6 million in fiscal year
1993. The fiscal year 1994 unrestricted General Fund ending balance is currently
projected to be $337.7 million.
    
 
   
    For  fiscal year 1993, the following  tax categories generated the following
percentages of the  State's $3,443.3  million total  gross receipts:  individual
income  taxes represented 51.1% of gross  fiscal year 1993 receipts; sales, use,
and other excise taxes represented 31.3% of gross fiscal year 1993 receipts; and
corporate income taxes represented 4.0% of gross fiscal year 1993 receipts.  The
final   budget  for  fiscal   year  1994  projects   General  Fund  revenues  of
approximately $3,570.8  million  and appropriations  of  approximately  $3,556.8
million.  The percentages of General  Fund revenue generated by  type of tax for
fiscal year 1994 are not expected to be significantly different from fiscal year
1993 percentages.
    
 
    STATE DEBT.  Under its constitution, the State of Colorado is not  permitted
to  issue general obligation bonds  secured by the full  faith and credit of the
State.  However,  certain  agencies  and  instrumentalities  of  the  State  are
authorized  to  issue  bonds  secured by  revenues  from  specific  projects and
activities. The State enters into  certain lease transactions which are  subject
to  annual  renewal  at the  option  of the  State.  In addition,  the  State is
authorized to issue  short-term revenue anticipation  notes. Local  governmental
units in the
 
                                       25
<PAGE>
State  are also authorized to incur  indebtedness. The major source of financing
for such  local  government indebtedness  is  an  ad valorem  property  tax.  In
addition,  in order to  finance public projects, local  governments in the State
can issue revenue bonds payable from the revenues of a utility or enterprise  or
from  the proceeds of  an excise tax,  or assessment bonds  payable from special
assessments. Colorado local governments can also finance public projects through
leases which are  subject to  annual appropriation at  the option  of the  local
government. Local governments in Colorado also issue tax anticipation notes. The
Amendment  requires prior voter approval for the creation of any multiple fiscal
year debt or other financial obligation  whatsoever, except for refundings at  a
lower rate or obligations of an enterprise.
 
   
    STATE  ECONOMY.  Based on data published by the State of Colorado, Office of
State Planning and Budgeting  as presented in the  Economic Report, over 50%  of
non-agricultural  employment in Colorado in 1993  was concentrated in the retail
and wholesale trade and service sectors, reflecting the importance of tourism to
the State's economy and of Denver as a regional economic and transportation hub.
The government  and  manufacturing sectors  followed  as the  fourth  and  fifth
largest  employment sectors in  the State, representing  approximately 17.8% and
11.3%, respectively, of non-agricultural  employment in the  State in 1993.  The
Office  of Planning and  Budgeting projects similar  concentrations for 1994 and
1995.
    
 
   
    According to the  Economic Report, the  unemployment rate improved  slightly
from  an average  of 5.9% during  1992 to  5.2% during 1993.  Total retail sales
increased by 9.7% during 1993. Colorado continued to surpass the job growth rate
of the U.S.,  with a  3.4% rate  of growth projected  for Colorado  in 1994,  as
compared with 2.2% for the nation as a whole. However, the rate of job growth in
Colorado is expected to decline in 1995, primarily due to the completion in 1994
of  large public  works projects,  such as  Denver International  Airport, Coors
Baseball Field, and the Denver Public Library renovation project.
    
 
   
    Personal income rose 7.6% in Colorado  during 1992 and 5.5% in 1991.  During
1993,  personal income  rose 7.4%  in Colorado,  as compared  with 4.7%  for the
nation as a whole.
    
 
    Economic conditions  in  the State  may  have continuing  effects  on  other
governmental  units within the State (including issuers of the Colorado Bonds in
the Colorado Insured Trust),  which, to varying  degrees, have also  experienced
reduced revenues as a result of recessionary conditions and other factors.
 
COLORADO TAXABLE ESTIMATED CURRENT RETURN TABLE
 
    The  following tables show the approximate taxable estimated current returns
for individuals  that are  equivalent to  tax-exempt estimated  current  returns
under  combined Federal and  state taxes, using  published 1994 marginal Federal
tax rates and marginal state tax  rates currently available and scheduled to  be
in  effect.  The  tables  incorporate  increased  tax  rates  for  higher-income
taxpayers that were  included in  the Revenue  Reconciliation Act  of 1993.  For
cases  in which more than one state  bracket falls within a Federal bracket, the
highest state bracket is combined with  the Federal bracket. The combined  state
and  Federal tax  brackets shown  reflect the fact  that state  tax payments are
currently deductible for Federal  tax purposes. The  tables illustrate what  you
would  have to  earn on  taxable investments  to equal  the tax-exempt estimated
current return for your  income tax bracket. A  taxpayer's marginal tax rate  is
affected  by both his taxable income and  his adjusted gross income. Locate your
adjusted  gross  and  your  taxable   income  (which  is  your  adjusted   gross
 
                                       26
<PAGE>
income  reduced by any deductions and  exemptions), then locate your tax bracket
based on  joint or  single tax  filing. Read  across to  the equivalent  taxable
estimated current return you would need to match the tax-free income.
 
 COMBINED MARGINAL TAX RATES FOR JOINT TAXPAYERS WITH FOUR PERSONAL EXEMPTIONS
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL
    FEDERAL      ADJUSTED      COMBINED
    TAXABLE        GROSS       STATE AND                   TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME        FEDERAL       --------------------------------------------------------------
   (1,000'S)     (1,000'S)     TAX RATE1      5.25%   5.50%   5.75%   6.00%   6.25%   6.50%   6.75%   7.00%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 38.0 $     0-111.8      19.5   %     6.52    6.83    7.14    7.45    7.76    8.07    8.39    8.70
    38.0- 91.9       0-111.8      31.5         7.66    8.03    8.39    8.76    9.12    9.49    9.85   10.22
                 111.8-167.7      32.5         7.78    8.15    8.52    8.89    9.26    9.63   10.00   10.37
    91.9-140.0       0-111.8      34.5         8.02    8.40    8.78    9.16    9.54    9.92   10.31   10.69
                 111.8-167.7      35.5         8.14    8.53    8.91    9.30    9.69   10.08   10.47   10.85
                 167.7-290.2      37.5         8.40    8.80    9.20    9.60   10.00   10.40   10.80   11.20
   140.0-250.0   111.8-167.7      40.0         8.75    9.17    9.58   10.00   10.42   10.83   11.25   11.67
                 167.7-290.2      43.0         9.21    9.65   10.09   10.53   10.96   11.40   11.84   12.28
                  Over 290.2      40.0   2     8.75    9.17    9.58   10.00   10.42   10.83   11.25   11.67
    Over 250.0   167.7-290.2      46.5         9.81   10.28   10.75   11.21   11.68   12.15   12.62   13.08
                  Over 290.2      44.0   3     9.38    9.82   10.27   10.71   11.16   11.61   12.05   12.50
</TABLE>
 
  COMBINED MARGINAL TAX RATES FOR SINGLE TAXPAYERS WITH ONE PERSONAL EXEMPTION
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL
    FEDERAL      ADJUSTED      COMBINED
    TAXABLE        GROSS       STATE AND                   TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME        FEDERAL       --------------------------------------------------------------
   (1,000'S)     (1,000'S)     TAX RATE1      5.25%   5.50%   5.75%   6.00%   6.25%   6.50%   6.75%   7.00%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 22.8 $     0-111.8      19.5   %     6.52    6.83    7.14    7.45    7.76    8.07    8.39    8.70
    22.8- 55.1       0-111.8      31.5         7.66    8.03    8.39    8.76    9.12    9.49    9.85   10.22
    55.1-115.0       0-111.8      34.5         8.02    8.40    8.78    9.16    9.54    9.92   10.31   10.69
                 111.8-234.3      36.0         8.20    8.59    8.98    9.38    9.77   10.16   10.55   10.94
   115.0-250.0   111.8-234.3      41.0         8.90    9.32    9.75   10.17   10.59   11.02   11.44   11.86
                  Over 234.3      40.0   2     8.75    9.17    9.58   10.00   10.42   10.83   11.25   11.67
    Over 250.0    Over 234.3      44.0   3     9.38    9.82   10.27   10.71   11.16   11.61   12.05   12.50
<FN>
- ------------------
 
      1  The table reflects the effect of the limitations on  itemized deductions and the deduction for personal exemptions. They
were designed to phase out certain benefits of these deductions for higher income taxpayers. These limitations, in effect,  raise
the  current maximum marginal Federal tax rate to approximately 44.0  percent for taxpayers filing a joint return and entitled to
four personal exemptions and to  approximately 41.0 percent for  taxpayers filing a single return  entitled to only one  personal
exemption.  These limitations are  subject to certain maximums,  which depend on  the number of exemptions  claimed and the total
amount of the taxpayer's itemized  deductions. For example, the  limitation on itemized deductions will  not cause a taxpayer  to
lose more than 80% of his allowable itemized deductions, with certain exceptions.
      2 Federal tax rate reverts to 36.0% after the 80% cap on the limitation on itemized deductions has been met.
      3 Federal tax rate reverts to 39.6% after the 80% cap on the limitation on itemized deductions has been met.
</TABLE>
 
    A  comparison of tax-free  and equivalent taxable  estimated current returns
with the returns on  various taxable investments is  one element to consider  in
making  an  investment  decision. The  Sponsor  may  from time  to  time  in its
advertising and sales materials  compare the then  current estimated returns  on
the Trust and returns over specified periods on other similar Nuveen Trusts with
returns  on taxable investments such as corporate or U.S. Government bonds, bank
CD's and  money  market  accounts or  money  market  funds, each  of  which  has
investment  characteristics  that  may  differ from  those  of  the  Trust. U.S.
Government bonds, for example, are  backed by the full  faith and credit of  the
U.S. Government and bank CD's and money market accounts are insured by an agency
of  the federal government. Money market accounts and money market funds provide
stability of principal, but pay
interest at rates that  vary with the condition  of the short-term debt  market.
The  investment characteristics of the Trust  are described more fully elsewhere
in this Prospectus.
 
                                       27
<PAGE>
   
NUVEEN TAX-EXEMPT UNIT TRUST
SCHEDULE OF INVESTMENTS AT DATE OF DEPOSIT
NOVEMBER 22, 1994
COLORADO INSURED TRUST 54
(SERIES 768)
    
 
<TABLE>
<CAPTION>
                                                                                          Ratings(3)           Trustee's
                                                                      Optional       ---------------------   Determination
 Aggregate        Name of Issuer and Title of Issue Represented      Redemption       Standard                of Offering
  Principal        by Sponsor's Contracts to Purchase Bonds(1)      Provisions(2)     & Poor's    Moody's      Price(4)
<C>          <C> <S>                                              <C>                <C>         <C>        <C>
- ---------------------------------------------------------------------------------------------------------------------------
$   500,000      Colorado State Board of Agriculture, Fort Lewis     2002 at 100        AAA         Aaa     $       477,125
                   College Auxiliary Facilities, Refunding and
                   Improvement Revenue Bonds, Series 1992, 6.50%
                   Due 10/1/12.
    500,000      Colorado Health Facilities Authority, Hospital      2004 at 102        AAA         Aaa             425,200
                   Revenue Refunding Bonds (Boulder Community
                   Hospital Project), Series 1994B, 5.875% Due
                   10/1/23.
    500,000      University of Colorado Hospital Authority,          2002 at 102        AAA         Aaa             457,690
                   Hospital Revenue Bonds, Series 1992A, 6.40%
                   Due 11/15/22.
    345,000      City of Colorado Springs, Colorado, Utilities       2002 at 100        AAA         Aaa             309,086
                   System Refunding Revenue Bonds, Series 1992A,
                   6.125% Due 11/15/20.
    500,000      Douglas County School District, Number RE.1,        2004 at 101        AAA         Aaa             475,000
                   Douglas and Elbert Counties, Colorado,
                   General Obligation Improvement Bonds, Series
                   1994A, 6.50% Due 12/15/16.
    500,000      Mesa County, Colorado, Revenue Bonds, Series        2003 at 102        AAA         Aaa             362,110
                   1994 (Sisters of Charity of Leavenworth
                   Health Services Corporation), 5.00% Due
                   12/1/23. (Original issue discount bonds
                   delivered on or about February 2, 1994 at a
                   price of 94.00% of principal amount.)
    155,000      Platte River Power Authority, Colorado, Power       2002 at 102        AAA         Aaa             127,594
                   Revenue Bonds, Series BB, 5.50% Due 6/1/18.
                   (Original issue discount bonds delivered on
                   or about December 3, 1992 at a price of
                   89.564% of principal amount.)
    500,000      Commonwealth of Puerto Rico, Public Improvement   2004 at 101 1/2      AAA         Aaa             466,315
                   Bonds of 1994 (General Obligation Bonds),
                   6.50% Due 7/1/23.
- -----------                                                                                                 ---------------
$ 3,500,000                                                                                                 $     3,100,120
- -----------                                                                                                 ---------------
- -----------                                                                                                 ---------------
</TABLE>
 
See Notes to Schedules of Investments, page 47.
 
                                       28
<PAGE>
   
GEORGIA INSURED TRUST 41
    
 
   
    The  Portfolio of Georgia Insured Trust  41 consists of 7 obligations issued
by entities located in Georgia and one obligation issued by an entity located in
the Territory of Puerto Rico. Three  Bonds in the Trust are general  obligations
of  the governmental entities issuing  them and are backed  by the taxing powers
thereof. Five Bonds in the Trust are  payable as to principal and interest  from
the  income of  a specific  project or  authority and  are not  supported by the
issuer's power to levy taxes. The sources of payment for these Bonds are divided
as follows: Dedicated-Tax  Supported Revenue, 1;  Electrical System Revenue,  1;
Combination  Utility Revenue, 1; Municipal Lease  Revenue, 1; Water and/or Sewer
Revenue, 1. All of the Bonds in the Trust, as insured, are rated AAA by Standard
& Poor's Corporation and Aaa by Moody's Investors Service, Inc.
    
 
   
    At the Date of  Deposit, the average  maturity of the  Bonds in the  Georgia
Insured  Trust is 25.2  years. The average maturity  of the Bonds  in a Trust is
calculated based upon the stated maturities of the Bonds in such Trust (or, with
respect to Bonds for  which funds or  securities have been  placed in escrow  to
redeem such Bonds on a stated call date, based upon such call date). The average
maturity  of the Bonds in a Trust may  increase or decrease from time to time as
Bonds mature or are called or sold.
    
 
   
    Approximately 14.3% of the  aggregate principal amount of  the Bonds in  the
Trust (accounting for approximately 13.1% of the aggregate offering price of the
Bonds)    are   original    issue   discount    bonds.   See    "GENERAL   TRUST
INFORMATION--ORIGINAL ISSUE  DISCOUNT  BONDS  AND STRIPPED  OBLIGATIONS"  for  a
discussion  of the  characteristics of  such bonds  and of  the risks associated
therewith.
    
 
    For a discussion of  the risks associated with  investments in the bonds  of
various issuers, see "General Trust Information" in this section.
 
   
    The  Sponsor entered  into contracts  to acquire  the Bonds  on November 21,
1994. The following  summarizes certain information  about the Bonds  as of  the
business day prior to the Date of Deposit:
    
 
<TABLE>
<CAPTION>
                                                                  DIFFERENCE BETWEEN TRUSTEE'S
                                                               DETERMINATION OF OFFERING PRICE AND
   COST TO    PROFIT (OR LOSS)   ANNUAL INTEREST   BID PRICE              THE BID PRICE
   SPONSOR       TO SPONSOR      INCOME TO TRUST    OF BONDS       (AS % OF PRINCIPAL AMOUNT)
  ----------  -----------------  ----------------  ----------  -----------------------------------
  <S>         <C>                <C>               <C>         <C>
  $3,057,490       $13,910           $211,275      $3,054,462                 .48%
</TABLE>
 
    Neither   cost  to  Sponsor  nor  profit   (or  loss)  to  Sponsor  reflects
underwriting profits or losses received or  incurred by the Sponsor through  its
participation   in  underwriting  syndicates.  An  underwriter  or  underwriting
syndicate purchases bonds  from the issuer  on a negotiated  or competitive  bid
basis  as principal with  the motive of  marketing such bonds  to investors at a
profit. The Sponsor did not participate as  either the sole underwriter or as  a
manager  or member of a syndicate that  acted as the original underwriter of any
of the Bonds.
 
   
    Unitholders may  elect to  have interest  distributions made  on a  monthly,
quarterly or semi-annual basis. The interest on the Bonds initially deposited in
the  Georgia Insured Trust,  less estimated expenses, is  estimated to accrue at
the rate of $.01624 per Unit per day under the semi-annual plan of distribution,
$.01619 per Unit per  day under the quarterly  plan of distribution and  $.01610
per  Unit per day under the monthly plan of distribution. It is anticipated that
the amount of interest to be distributed  per Unit in each year under each  plan
of  distribution  will initially  be substantially  equal  to the  Estimated Net
Annual Interest Income per Unit for that plan.
    
 
                                       29
<PAGE>
    Details of  interest distributions  per Unit  of the  Georgia Insured  Trust
under  the various plans appear in the  following table based upon estimated Net
Annual Interest Income at the Date of Deposit:
 
<TABLE>
<CAPTION>
                                                                                                                       NORMAL
                                                                                                                   DISTRIBUTIONS
GEORGIA INSURED TRUST                                                   1995                                          PER YEAR
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        1/1            2/1            5/1            8/1           11/1
Distribution Date.....................       1/15           2/15           5/15           8/15          11/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .6279(1)                                                               $  5.7984
                                                              --------   $.4830 every month   --------
Quarterly Distribution Plan...........  $   .6279(1)   $   .4857(2)   $  1.4571      $  1.4571      $  1.4571      $  5.8304
Semi-Annual Distribution Plan.........  $   .6279(1)                  $  1.9488(3)                  $  2.9232      $  5.8494
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
 * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May  1,
   August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1)  The first distribution will be paid to all Unitholders,  regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The  second distribution  under the  quarterly  distribution plan  represents a  1-month distribution;  subsequent  quarterly
    distributions will be regular 3-month distributions.
(3)  The second distribution  under the semi-annual distribution  plan represents a  4-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
    The accrual amounts set forth above, and  in turn the amount of interest  to
be  distributed annually per Unit, will  generally change as Bonds are redeemed,
mature or are sold or as fees and expenses increase or decrease.
 
TAX STATUS--GEORGIA INSURED TRUST
 
    For a  discussion of  the Federal  tax status  of income  earned on  Georgia
Insured Trust Units, see Section 11.
 
    In  the opinion of Chapman and Cutler, counsel to the Sponsor under existing
law:
 
        For Georgia income  tax purposes, the  Georgia Insured Trust  is not  an
    association  taxable as a corporation, and the income of the Georgia Insured
    Trust will be  treated as  the income of  the Unitholders.  Interest on  the
    Georgia  Bonds which is exempt from Georgia  income tax when received by the
    Georgia Insured Trust, and which would be exempt from Georgia income tax  if
    received  directly by  a Unitholder,  will retain  its status  as tax-exempt
    interest when distributed by the Georgia  Insured Trust and received by  the
    Unitholders.
 
        If  the Trustee disposes  of a Georgia Bond  (whether by sale, exchange,
    payment on maturity, retirement or otherwise) or if a Unitholder redeems  or
    sells  his  Unit, the  Unitholder will  recognize gain  or loss  for Georgia
    income tax purposes to the same extent that gain or loss would be recognized
    for federal income tax purposes (except in the case of Georgia Bonds  issued
    before  March  11, 1987  issued with  original issue  discount owned  by the
    Georgia Insured Trust  in which  case gain or  loss for  Georgia income  tax
    purposes  would be determined by accruing  said original issue discount on a
    ratable basis). Due  to the  amortization of  bond premium  and other  basis
    adjustments  required by the Internal Revenue Code, a Unitholder, under some
    circumstances, may realize taxable  gain when his or  her Units are sold  or
    redeemed for an amount equal to their original cost.
 
        Because  obligations  or evidences  of  debt of  Georgia,  its political
    subdivisions and public institutions and  bonds issued by the Government  of
    Puerto  Rico are exempt  from the Georgia  intangible personal property tax,
    the Trust will  not be subject  to such tax  as the result  of holding  such
    obligations, evidences of debt or bonds. Although there
 
                                       30
<PAGE>
    currently  is no published  administrative interpretation or  opinion of the
    Attorney General of  Georgia dealing with  the status of  bonds issued by  a
    political  subdivision  of Puerto  Rico, we  have in  the past  been advised
    orally by representatives  of the  Georgia Department of  Revenue that  such
    bonds  would also be considered exempt from  such tax. Based on that advice,
    and in  the absence  of  a published  administrative interpretation  to  the
    contrary,  we are of the opinion that the Trust would not be subject to such
    tax as the  result of  holding bonds issued  by a  political subdivision  of
    Puerto Rico.
 
        Amounts paid by the Insurer under an insurance policy or policies issued
    to  the Trust, if any, with respect to  the Georgia Bonds in the Trust which
    represent maturing interest  on defaulted  obligations held  by the  Trustee
    will  be  exempt from  State income  taxes if,  and to  the extent  as, such
    interest would have been so  exempt if paid by  the issuer of the  defaulted
    obligations  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 obligations, rather  than
    the insurer, will pay debt service on the obligations.
 
        We  express no opinion regarding whether  a Unitholder's ownership of an
    interest in the Trust is subject to the Georgia intangible personal property
    tax. Although the  application of the  Georgia intangible personal  property
    tax  to  the  ownership  of  the Units  by  the  Unitholders  is  not clear,
    representatives of  the  Georgia Department  of  Revenue have  in  the  past
    advised  us orally  that, for purposes  of the intangible  property tax, the
    Department considers a Unitholder's ownership of an interest in the Trust as
    a whole  to  be taxable  intangible  property separate  from  any  ownership
    interest in the underlying tax-exempt Georgia Bonds.
 
        Neither the Georgia Bonds nor the Units will be subject to Georgia sales
    or use tax.
 
ECONOMIC FACTORS--GEORGIA
 
    The  following brief summary regarding the  economy of Georgia is based upon
information drawn from publicly available  sources and is included for  purposes
of  providing information about general economic  conditions that may or may not
affect issuers of  the Georgia  obligations. The Sponsor  has not  independently
verified any of the information contained in such publicly available documents.
 
    CONSTITUTIONAL   CONSIDERATIONS.    The  Georgia  Constitution  permits  the
issuance by  the State  of general  obligation debt  and of  certain  guaranteed
revenue  debt. The State  may incur guaranteed revenue  debt by guaranteeing the
payment of  certain revenue  obligations  issued by  an instrumentality  of  the
State.   The  Georgia  Constitution  prohibits  the  incurring  of  any  general
obligation debt or guaranteed revenue debt if the highest aggregate annual  debt
service  requirement for the then current year or any subsequent fiscal year for
outstanding general obligation debt and  guaranteed revenue debt, including  the
proposed debt, exceed 10 percent of the total revenue receipts, less refunds, of
the  State treasury in the  fiscal year immediately preceding  the year in which
any such debt is to be incurred.
 
    The Georgia Constitution  also permits  the State  to incur  public debt  to
supply a temporary deficit in the State treasury in any fiscal year created by a
delay  in collecting the taxes  of that year. Such debt  must not exceed, in the
aggregate, 5% of the total revenue receipts, less refunds, of the State treasury
in the  fiscal  year  immediately preceding  the  year  in which  such  debt  is
incurred.  The debt  incurred must be  repaid on or  before the last  day of the
fiscal year in  which it  is to be  incurred out  of the taxes  levied for  that
fiscal  year. No such debt may  be incurred in any fiscal  year if there is then
outstanding unpaid debt from any previous
 
                                       31
<PAGE>
fiscal year  which was  incurred to  supply  a temporary  deficit in  the  State
treasury.  No such short-term debt has  been incurred under this provision since
the inception of the constitutional authority referred to in this paragraph.
 
    Virtually all of the  issues of long-term debt  obligations issued by or  on
behalf  of the State of Georgia and counties, municipalities and other political
subdivisions and public authorities thereof are required by law to be  validated
and confirmed in a judicial proceeding prior to issuance. The legal effect of an
approved  validation in Georgia  is to render incontestable  the validity of the
pertinent bond issue and the security therefor.
 
   
    THE STATE AND ITS ECONOMY.   The State operates  on a fiscal year  beginning
July 1 and ending June 30. Thus, the 1994 fiscal year ended June 30, 1994. Based
on  data from  the Georgia  Department of  Revenue, receipts  of the  State from
income tax and sales tax for the 1992 fiscal year comprised approximately  48.8%
and  37.5%, respectively, of the total State  tax revenues. Such data shows that
total  State  treasury  receipts   for  the  1992   fiscal  year  increased   by
approximately 2.16% over such collections in the 1991 fiscal year. The estimated
1993 fiscal year figures indicate that receipts of the State from income tax and
sales  tax  for the  1993  fiscal year  comprised  approximately 48.1%  and 38%,
respectively, of the total State tax revenues. Total estimated State tax revenue
collections for the 1993 fiscal year indicate an increase of approximately 9.89%
over such collections in  the 1992 fiscal year.  The estimated 1994 fiscal  year
figures  indicate that receipts of  the State from income  tax and sales tax for
the 1994 fiscal year will comprise approximately 48.8% and 37.9%,  respectively,
of  the total State tax revenues.  Total estimated State tax revenue collections
for the 1994 fiscal year indicate  an increase of approximately 9.56% over  such
collections in the 1993 fiscal year.
    
 
    Georgia  experienced an economic  slowdown in the  late 1980s that continued
into 1992. The 1991 fiscal year ended  with a balanced budget, but only  because
the  State had borrowed approximately $90  million from surpluses maintained for
special uses. In light  of weaker than expected  monthly revenue collections  in
May  and June of 1991, Georgia lawmakers,  in a special legislative session, cut
budgeted expenditures for the  1992 fiscal year by  $415 million. Georgia  ended
its  1992 fiscal year, however, with strong monthly revenue collections. For the
last four  months of  fiscal year  1992, Georgia's  revenues were  more than  6%
higher  than revenues  reported one  year earlier for  the same  time period. By
year-end, revenue collections  fell only 0.1%  short of that  expected to  cover
1992  expenditures. This shortfall was  made up from funds  allocated to but not
used by state agencies.  The authorized 1993 fiscal  year budget consists of  an
$8.3  billion  spending  plan  and approximately  $750  million  in  new general
obligation debt. On  March 23, 1993,  the Georgia General  Assembly approved  an
$8.9  billion budget for  the 1994 fiscal year  which includes authorization for
$792 million of general obligation borrowing.
 
    Although the  20-county  Atlanta  metropolitan  region  continues  to  drive
economic  expansion in Georgia,  the region's core  city faces growing problems.
Atlanta has lost popula-
tion since 1970, has  become poorer, and the  business sector has stagnated.  In
contrast  to Atlanta's problems, the expanding  economy and widening tax base of
the metropolitan  area as  a whole  continues to  be the  driving force  in  the
state's expansion.
 
    The  Georgia economy has  performed relatively well  during recent years and
generally has expanded at a rate  greater than the national average during  that
period. However, growth
in  1988 through 1992 slowed somewhat and was modest compared to the pace of the
early 1980's. Georgia's economy, however, has made a robust recovery through the
1993 and  1994 fiscal  years.  The 1992  annual  average unemployment  rate  for
Georgia was 6.9% as compared
 
                                       32
<PAGE>
to  the 1992 national annual average unemployment  rate of 7.4%. The 1993 annual
average unemployment rate for Georgia was 5.7% as compared to the 1993  national
annual   average  unemployment  rate  of  6.7%.  Throughout  1994,  the  monthly
unemployment rate for Georgia (not  seasonally adjusted) has remained below  the
national  average monthly unemployment  rate (not seasonally  adjusted). In June
and July 1994, Georgia's unemployment rate  was 5.8% and 6.0%, respectively,  as
compared to the national average unemployment rate of 6.2% for both months.
 
    In  July, 1994, widespread  flooding in central  and southern Georgia caused
extensive damage and destruction of farmland, private residences, businesses and
local and state government facilities. As of July 12, 1994, Governor Zell Miller
refused to estimate the  dollar value of the  damage but other sources  estimate
that  damage could exceed  $300 million. Thirty-one  counties have been declared
federal disaster areas. Moody's Investors Service, Inc. and Standard and  Poor's
Corporation  are observing the  situation in Georgia,  but neither rating agency
has expressed any immediate credit concerns.
 
    BOND RATINGS.   Currently,  Moody's Investors  Service, Inc.  rates  Georgia
general  obligation bonds Aaa and Standard & Poor's Corporation rates such bonds
AA+.
 
   
    LEGAL PROCEEDINGS.  Georgia is  involved in certain legal proceedings  that,
if  decided against the State, may require  the State to make significant future
expenditures or may  substantially impair revenues.  Several lawsuits have  been
filed  against  Georgia  asserting  that  the  decision  in  DAVIS  V.  MICHIGAN
DEPARTMENT OF TREASURY, 489 U.S. 803 (1989), invalidating Michigan's practice of
taxing retirement benefits paid by the federal government while exempting  state
retirement  benefits,  also  invalidates  Georgia's  tax  treatment  of  Federal
Retirement Benefits for years prior to  1989. Under Georgia's applicable 3  year
statute  of  limitation  the  maximum  potential  liability  under  these  suits
calculated to August 15,  1993 would appear  to be no  greater than 100  million
dollars.  The plaintiffs in  these suits, however, have  requested refunds for a
period from 1980 to 1988 which could result in a maximum potential liability  in
the  range of 591 million  dollars. Any such liability  would be predicated on a
holding by the State of Georgia Supreme Court or the United States Supreme Court
that the  DAVIS decision  is  applicable to  Georgia's  prior method  of  taxing
Federal  Retirement  Benefits and  that  the DAVIS  decision  is to  be  given a
retroactive effect, i.e., that the decision  affects prior tax years and that  a
refund  remedy is  appropriate. In  Georgia's "test  case", the  Georgia Supreme
Court held that no refunds are due. The plaintiff's petition to the U.S. Supreme
Court for a writ of certiorari was granted on February 22, 1994.
    
   
    Three suits have been filed against the State of Georgia seeking refunds  of
liquor  taxes under O.C.G.A. Section 48-2-35,  in light of BACCHUS IMPORTS, LTD.
V. DIAS,  468 U.S.  263 (1984)  under Georgia's  pre-BACCHUS statute.  In  JAMES
B.BEAM DISTILLING CO. V. STATE, 501 U.S. 529 (decided June 20, 1991) the Supreme
Court  indicated that  BACCHUS was  retroactive, but  only within  the bounds of
State statutes of  limitations and  procedural bars,  and left  State courts  to
determine  any remedy in light  of reliance interests, equitable considerations,
and other defenses. Georgia's statute of limitations in O.C.G.A. Section 48-2-35
has run on all pre-BACCHUS claims for refund except five pending claims  seeking
31.7 million dollars in tax plus interest. On remand, the Fulton County Superior
Court  has ruled  that procedural  bars and other  defenses bar  any recovery by
taxpayers on Beam's claims for refund.  The Georgia Supreme Court has  affirmed,
and  Beam  has  petitioned  the  United  States  Supreme  Court  for  a  writ of
certiorari.
    
   
    Two additional suits have  been filed with the  State of Georgia by  foreign
producers  of  alcoholic beverages  seeking $96  million  in refunds  of alcohol
import taxes imposed under
    
 
                                       33
<PAGE>
   
O.C.G.A. Section 3-4-60.  These claims  constitute 99%  of all  such taxes  paid
during the preceding three years.
    
 
    In  BOARD  OF  PUBLIC  EDUCATION FOR  SAVANNAH/CHATHAM  COUNTY  V.  STATE OF
GEORGIA, the local school board claimed that the State should finance the  major
portion of the costs of its desegregation program. The Savannah Board originally
requested  restitution in  the amount of  $30 million, but  the Federal District
Court set forth a formula which would  require a State payment in the amount  of
approximately  $6  million.  Both sides  have  moved for  reconsideration.  In a
similar case,  a Federal  district court  held that  the State  of Georgia  must
reimburse  DeKalb County's school system for $24.6 million that was spent to bus
students as part of  an effort to  integrate schools between  1977 and 1992.  In
addition,  the court ruled that Georgia  must pay for the county's desegregation
busing costs since 1992. School officials estimate those expenses at $9 million.
 
    The foregoing information does  not purport to be  a complete or  exhaustive
description  of all  conditions to  which the  issuers of  Bonds in  the Georgia
Insured Trust are subject. Many factors including national economic, social  and
environmental  policies and conditions, which are  not within the control of the
issuers of Bonds could affect or could  have an adverse impact on the  financial
condition  of the State and various  agencies and political subdivisions located
in the  State. Since  Georgia Bonds  in the  Georgia Insured  Trust (other  than
general  obligation bonds issued by the  State) are payable from revenue derived
from a specific source or authority, the  impact of a pronounced decline in  the
national  economy  or difficulties  in significant  industries within  the State
could result in a decrease in the  amount of revenues realized from such  source
or  by such authority  and thus adversely  affect the ability  of the respective
issuers of  the Georgia  Bonds in  the Georgia  Insured Trust  to pay  the  debt
service  requirements  on the  Georgia Bonds.  Similarly, such  adverse economic
developments could result in  a decrease in tax  revenues realized by the  State
and thus could adversely affect the ability of the State to pay the debt service
requirements  of any  Georgia general  obligation bonds  in the  Georgia Insured
Trust.
 
GEORGIA 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 1994 marginal  Federal
tax  rates and marginal state tax rates  currently available and scheduled to be
in  effect.  The  tables  incorporate  increased  tax  rates  for  higher-income
taxpayers  that were  included in  the Revenue  Reconciliation Act  of 1993. For
cases in which more than one state  bracket falls within a Federal bracket,  the
highest  state bracket is combined with  the Federal bracket. The combined state
and Federal tax  brackets shown  reflect the fact  that state  tax payments  are
currently  deductible for Federal  tax purposes. The  tables illustrate what you
would have to  earn on  taxable investments  to equal  the tax-exempt  estimated
current  return for your income  tax bracket. A taxpayer's  marginal tax rate is
affected by both his taxable income  and his adjusted gross income. Locate  your
adjusted  gross and  your taxable  income (which  is your  adjusted gross income
reduced by any deductions and exemptions), then locate your tax bracket based on
joint or single  tax filing.  Read across  to the  equivalent taxable  estimated
current return you would need to match the tax-free income.
 
                                       34
<PAGE>
 COMBINED MARGINAL TAX RATES FOR JOINT TAXPAYERS WITH FOUR PERSONAL EXEMPTIONS
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL
    FEDERAL      ADJUSTED      COMBINED
    TAXABLE        GROSS       STATE AND                   TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME        FEDERAL       --------------------------------------------------------------
   (1,000'S)     (1,000'S)     TAX RATE1      5.50%   5.75%   6.00%   6.25%   6.50%   6.75%   7.00%   7.25%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 38.0 $     0-111.8      20.0   %     6.88    7.19    7.50    7.81    8.13    8.44    8.75    9.06
    38.0- 91.9       0-111.8      32.5         8.15    8.52    8.89    9.26    9.63   10.00   10.37   10.74
                 111.8-167.7      33.0         8.21    8.58    8.96    9.33    9.70   10.07   10.45   10.82
    91.9-140.0       0-111.8      35.0         8.46    8.85    9.23    9.62   10.00   10.38   10.77   11.15
                 111.8-167.7      36.0         8.59    8.98    9.38    9.77   10.16   10.55   10.94   11.33
                 167.7-290.2      38.5         8.94    9.35    9.76   10.16   10.57   10.98   11.38   11.79
   140.0-250.0   111.8-167.7      41.0         9.32    9.75   10.17   10.59   11.02   11.44   11.86   12.29
                 167.7-290.2      43.5         9.73   10.18   10.62   11.06   11.50   11.95   12.39   12.83
                  Over 290.2      41.0   2     9.32    9.75   10.17   10.59   11.02   11.44   11.86   12.29
    Over 250.0   167.7-290.2      47.5        10.48   10.95   11.43   11.90   12.38   12.86   13.33   13.81
                  Over 290.2      44.5   3     9.91   10.36   10.81   11.26   11.71   12.16   12.61   13.06
</TABLE>
 
  COMBINED MARGINAL TAX RATES FOR SINGLE TAXPAYERS WITH ONE PERSONAL EXEMPTION
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL
    FEDERAL      ADJUSTED      COMBINED
    TAXABLE        GROSS       STATE AND                   TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME        FEDERAL       --------------------------------------------------------------
   (1,000'S)     (1,000'S)     TAX RATE1      5.50%   5.75%   6.00%   6.25%   6.50%   6.75%   7.00%   7.25%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 22.8 $     0-111.8      20.0         6.88    7.19    7.50    7.81    8.13    8.44    8.75    9.06
    22.8- 55.1       0-111.8      32.5         8.15    8.52    8.89    9.26    9.63   10.00   10.37   10.74
    55.1-115.0       0-111.8      35.0         8.46    8.85    9.23    9.62   10.00   10.38   10.77   11.15
                 111.8-234.3      36.5         8.66    9.06    9.45    9.84   10.24   10.63   11.02   11.42
   115.0-250.0   111.8-234.3      41.5         9.40    9.83   10.26   10.68   11.11   11.54   11.97   12.39
                  Over 234.3      41.0   2     9.32    9.75   10.17   10.59   11.02   11.44   11.86   12.29
    Over 250.0    Over 234.3      44.5   3     9.91   10.36   10.81   11.26   11.71   12.16   12.61   13.06
<FN>
- ------------------
      1  The table reflects the effect of the limitations on  itemized deductions and the deduction for personal exemptions. They
were designed to phase out certain benefits of these deductions for higher income taxpayers. These limitations, in effect,  raise
the  current maximum marginal Federal tax rate to approximately 44.0  percent for taxpayers filing a joint return and entitled to
four personal exemptions and to  approximately 41.0 percent for  taxpayers filing a single return  entitled to only one  personal
exemption.  These limitations are  subject to certain maximums,  which depend on  the number of exemptions  claimed and the total
amount of the taxpayer's itemized  deductions. For example, the  limitation on itemized deductions will  not cause a taxpayer  to
lose more than 80% of his allowable itemized deductions, with certain exceptions.
      2 Federal tax rate reverts to 36.0% after the 80% cap on the limitation on itemized deductions has been met.
      3 Federal tax rate reverts to 39.6% after the 80% cap on the limitation on itemized deductions has been met.
</TABLE>
 
    A  comparison of tax-free  and equivalent taxable  estimated current returns
with the returns on  various taxable investments is  one element to consider  in
making  an  investment  decision. The  Sponsor  may  from time  to  time  in its
advertising and sales materials  compare the then  current estimated returns  on
the Trust and returns over specified periods on other similar Nuveen Trusts with
returns  on taxable investments such as corporate or U.S. Government bonds, bank
CD's and  money  market  accounts or  money  market  funds, each  of  which  has
investment  characteristics  that  may  differ from  those  of  the  Trust. U.S.
Government bonds, for example, are  backed by the full  faith and credit of  the
U.S. Government and bank CD's and money market accounts are insured by an agency
of  the federal government. Money market accounts and money market funds provide
stability of principal, but pay interest  at rates that vary with the  condition
of  the short-term debt market. The  investment characteristics of the Trust are
described more fully elsewhere in this Prospectus.
 
                                       35
<PAGE>
   
NUVEEN TAX-EXEMPT UNIT TRUST
SCHEDULE OF INVESTMENTS AT DATE OF DEPOSIT
NOVEMBER 22, 1994
GEORGIA INSURED TRUST 41
(SERIES 768)
    
 
<TABLE>
<CAPTION>
                                                                                          Ratings(3)           Trustee's
                                                                      Optional       ---------------------   Determination
 Aggregate        Name of Issuer and Title of Issue Represented      Redemption       Standard                of Offering
  Principal        by Sponsor's Contracts to Purchase Bonds(1)      Provisions(2)     & Poor's    Moody's      Price(4)
<C>          <C> <S>                                              <C>                <C>         <C>        <C>
- ---------------------------------------------------------------------------------------------------------------------------
$   500,000      Municipal Electric Authority of Georgia, Power   No Optional Call      AAA         Aaa     $       466,410
                   Revenue Bonds, Series V, 6.60% Due 1/1/18.
    500,000      The City of Atlanta, Georgia, Certificates of       2002 at 102        AAA         Aaa             454,755
                   Participation (Atlanta Pretrial Detention
                   Center Project), Series 1992, 6.25% Due
                   12/1/17.
    450,000      Bartow County School District (Georgia),            2003 at 102        AAA         Aaa             386,208
                   General Obligation School Bonds (Series 1993
                   Bonds), 5.70% Due 5/1/14.
    250,000      Cobb-Marietta Coliseum and Exhibit Hall          No Optional Call      AAA         Aaa             205,535
                   Authority (Georgia), Revenue Refunding Bonds,
                   Series 1993, 5.50% Due 10/1/18.
    500,000      City of Cordele (Georgia), Combined Public          2004 at 102        AAA         Aaa             461,015
                   Utility Revenue Refunding and Improvement
                   Bonds, Series 1994, 6.375% Due 11/1/24.
    300,000      DeKalb County, Georgia, Water and Sewerage          2003 at 102        AAA         Aaa             229,272
                   Revenue Bonds, Series 1993, 5.25% Due
                   10/1/23.
    500,000      The Fulton-DeKalb Hospital Authority (Georgia),     2003 at 102        AAA         Aaa             401,890
                   Revenue Refunding Certificates, Series 1993,
                   5.50% Due 1/1/20. (Original issue discount
                   bonds delivered on or about June 15, 1993 at
                   a price of 94.499% of principal
                   amount.)(General Obligation Bonds.)
    500,000      Commonwealth of Puerto Rico, Public Improvement   2004 at 101 1/2      AAA         Aaa             466,315
                   Bonds of 1994 (General Obligation Bonds),
                   6.50% Due 7/1/23.
- -----------                                                                                                 ---------------
$ 3,500,000                                                                                                 $     3,071,400
- -----------                                                                                                 ---------------
- -----------                                                                                                 ---------------
</TABLE>
 
See Notes to Schedules of Investments, page 47.
 
                                       36
<PAGE>
   
PENNSYLVANIA INSURED TRUST 190
    
 
   
    The  Portfolio of Pennsylvania  Insured Trust 190  consists of 6 obligations
issued by  entities located  in Pennsylvania  and one  obligation issued  by  an
entity  located in  the Territory  of Puerto Rico.  One Bond  in the  Trust is a
general obligation of the  governmental entity issuing it  and is backed by  the
taxing  power thereof. Six  Bonds in the  Trust are payable  as to principal and
interest from  the  income  of a  specific  project  or authority  and  are  not
supported  by the issuer's power to levy taxes. The sources of payment for these
bonds are divided as  follows: Dedicated-Tax Supported  Revenue, 1; College  and
University  Revenue,  2;  Electrical  System Revenue,  1;  Health  Care Facility
Revenue, 2. All of the Bonds in the Trust, as insured, are rated AAA by Standard
& Poor's Corporation and Aaa by Moody's Investors Service, Inc.
    
 
   
    At  the  Date  of  Deposit,  the  average  maturity  of  the  Bonds  in  the
Pennsylvania Insured Trust is 26.6 years. The average maturity of the Bonds in a
Trust  is calculated based upon the stated maturities of the Bonds in such Trust
(or, with respect to  Bonds for which  funds or securities  have been placed  in
escrow  to redeem such Bonds on a stated  call date, based upon such call date).
The average maturity of the Bonds in a Trust may increase or decrease from  time
to time as Bonds mature or are called or sold.
    
 
   
    Approximately  14.3% of the  aggregate principal amount of  the Bonds in the
Trust (accounting for approximately 13.8% of the aggregate offering price of the
Bonds)   are    original   issue    discount   bonds.    See   "GENERAL    TRUST
INFORMATION--ORIGINAL  ISSUE  DISCOUNT  BONDS AND  STRIPPED  OBLIGATIONS"  for a
discussion of the  characteristics of  such bonds  and of  the risks  associated
therewith.
    
 
    Approximately  29% of  the aggregate  principal amount  of the  Bonds in the
Trust consists of obligations  of issuers whose  revenues are primarily  derived
from  payments  to  colleges  and  universities,  including  tuition,  dormitory
revenues, grants and endorsements.
 
    Approximately 29% of  the aggregate  principal amount  of the  Bonds in  the
Trust  consists of obligations  of issuers whose  revenues are primarily derived
from services provided by hospitals or other health care facilities.
 
    For a discussion of  the risks associated with  investments in the bonds  of
various issuers, see "General Trust Information" in this section.
 
   
    The  Sponsor entered  into contracts  to acquire  the Bonds  on November 21,
1994. The following  summarizes certain information  about the Bonds  as of  the
business day prior to the Date of Deposit:
    
 
<TABLE>
<CAPTION>
                                                                  DIFFERENCE BETWEEN TRUSTEE'S
                                                               DETERMINATION OF OFFERING PRICE AND
   COST TO    PROFIT (OR LOSS)   ANNUAL INTEREST   BID PRICE              THE BID PRICE
   SPONSOR       TO SPONSOR      INCOME TO TRUST    OF BONDS       (AS % OF PRINCIPAL AMOUNT)
  ----------  -----------------  ----------------  ----------  -----------------------------------
  <S>         <C>                <C>               <C>         <C>
  $3,077,015       $13,215           $214,500      $3,073,355                 .48%
</TABLE>
 
    Neither   cost  to  Sponsor  nor  profit   (or  loss)  to  Sponsor  reflects
underwriting profits or losses received or  incurred by the Sponsor through  its
participation   in  underwriting  syndicates.  An  underwriter  or  underwriting
syndicate purchases bonds  from the issuer  on a negotiated  or competitive  bid
basis  as principal with  the motive of  marketing such bonds  to investors at a
profit. The Sponsor did not participate as  either the sole underwriter or as  a
manager  or member of a syndicate that  acted as the original underwriter of any
of the Bonds.
 
   
    Unitholders may  elect to  have interest  distributions made  on a  monthly,
quarterly or semi-annual basis. The interest on the Bonds initially deposited in
the  Pennsylvania Insured Trust, less estimated expenses, is estimated to accrue
at the rate of $.01650 per
    
 
                                       37
<PAGE>
   
Unit per day under  the semi-annual plan of  distribution, $.01644 per Unit  per
day  under the quarterly plan of distribution and $.01636 per Unit per day under
the monthly plan of distribution. It is anticipated that the amount of  interest
to  be distributed per  Unit in each  year under each  plan of distribution will
initially be substantially equal to the Estimated Net Annual Interest Income per
Unit for that plan.
    
 
    Details of interest distributions per Unit of the Pennsylvania Insured Trust
under the various plans appear in  the following table based upon estimated  Net
Annual Interest Income at the Date of Deposit:
 
<TABLE>
<CAPTION>
                                                                                                                       NORMAL
                                                                                                                   DISTRIBUTIONS
PENNSYLVANIA INSURED TRUST                                              1995                                          PER YEAR
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        1/1            2/1            5/1            8/1           11/1
Distribution Date.....................       1/15           2/15           5/15           8/15          11/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .6380(1)                                                               $  5.8898
                                                              --------   $.4908 every month   --------
Quarterly Distribution Plan...........  $   .6380(1)   $   .4932(2)   $  1.4796      $  1.4796      $  1.4796      $  5.9218
Semi-Annual Distribution Plan.........  $   .6380(1)                  $  1.9800(3)                  $  2.9700      $  5.9408
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
 *  Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
   August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all  Unitholders, regardless of the distribution plan selected. Such distribution  may
    be more or less than a regular monthly distribution.
(2)  The  second distribution  under the  quarterly distribution  plan  represents a  1-month distribution;  subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution  under the semi-annual  distribution plan represents a  4-month distribution; subsequent  semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
    The  accrual amounts set forth above, and  in turn the amount of interest to
be distributed annually per Unit, will  generally change as Bonds are  redeemed,
mature or are sold or as fees and expenses increase or decrease.
 
TAX STATUS--PENNSYLVANIA INSURED TRUST
 
    For  a discussion of the Federal tax status of income earned on Pennsylvania
Insured Trust Units, see Section 11.
 
    In the opinion of  Dechert Price & Rhoads,  special Pennsylvania counsel  to
the Series, under existing law:
 
        Units  evidencing  fractional  undivided interests  in  the Pennsylvania
    Insured Trust  are  not  subject  to any  of  the  personal  property  taxes
    presently  in effect in Pennsylvania to the extent of that proportion of the
    Trust represented by Bonds issued  by the Commonwealth of Pennsylvania,  its
    agencies  and  instrumentalities, or  by  any county,  city,  borough, town,
    township,  school  district,  municipality  and  local  housing  or  parking
    authority  in the Commonwealth of Pennsylvania or issued by Puerto Rico, the
    Virgin Islands, Guam or the Northern Mariana Islands ("Pennsylvania Bonds").
    The taxes referred to  above include the County  Personal Property Tax,  the
    additional  personal property taxes  imposed on Pittsburgh  residents by the
    School District of  Pittsburgh and by  the City of  Pittsburgh. The City  of
    Pittsburgh,  the School District  of Pittsburgh and  Allegheny County cannot
    impose personal property taxes as  of January 1, 1995. Pennsylvania  Insured
    Trust  Units may  be taxable under  the Pennsylvania  inheritance and estate
    taxes.
 
        The proportion  of interest  income  representing interest  income  from
    Pennsylvania  Bonds distributed  to Unitholders of  the Pennsylvania Insured
    Trust is not taxable under the Pennsylvania Personal Income Tax or under the
    Corporate Net Income Tax  imposed on corporations by  Article IV of the  Tax
    Reform Code. Nor will such interest be taxable
 
                                       38
<PAGE>
    under  the  Philadelphia School  District Investment  Income Tax  imposed on
    Philadelphia resident individuals.
 
        The disposition by the Pennsylvania Insured Trust of a Pennsylvania Bond
    (whether by  sale, exchange,  redemption or  payment at  maturity) will  not
    constitute  a taxable event to a  Unitholder under the Pennsylvania Personal
    Income Tax if the  Pennsylvania Bond was issued  prior to February 1,  1994.
    Further, although there is no published authority on the subject, counsel is
    of  the opinion that (i) a Unitholder of the Pennsylvania Insured Trust will
    not have a taxable event under the Pennsylvania state and local income taxes
    referred to in the preceding paragraph (other than the Corporate Net  Income
    Tax)  upon  the  redemption or  sale  of his  Unit  to the  extent  that the
    Pennsylvania Insured Trust  is then comprised  of Pennsylvania Bonds  issued
    prior  to February  1, 1994  and (ii)  the dispositions  by the Pennsylvania
    Insured Trust of a Pennsylvania Bond (whether by sale, exchange,  redemption
    or  payment at maturity) will not constitute a taxable event to a Unitholder
    under the  Corporate Net  Income  Tax or  the Philadelphia  School  District
    Investment  Income Tax if the Pennsylvania Bond was issued prior to February
    1, 1994.  (The  School  District tax  has  no  application to  gain  on  the
    disposition of property held by the taxpayer for more than six months.)
 
        Gains  on the  sale, exchange, redemption,  or payment at  maturity of a
    Pennsylvania Bond issued on or after February 1, 1994, will be taxable under
    all of these taxes, as will gains on the redemption or sale of a unit to the
    extent that the Trust is comprised of Pennsylvania Bonds issued on or  after
    February 1, 1994.
 
ECONOMIC FACTORS--PENNSYLVANIA
 
    RISK   FACTORS--Prospective   investors   should   consider   the  financial
difficulties and pressures which the Commonwealth of Pennsylvania and certain of
its municipal subdivisions have undergone. Both the Commonwealth and the City of
Philadelphia have historically experienced significant revenue shortfalls. There
can be no assurance that the  Commonwealth will not experience further  declines
in  economic conditions or that portions  of the municipal obligations purchased
by the Fund  will not  be affected  by such  declines. Without  intending to  be
complete,  the following briefly  summarizes some of  these difficulties and the
current financial situation, as  well as some of  the complex factors  affecting
the financial situation in the Commonwealth. It is derived from sources that are
generally  available to investors  and is based in  part on information obtained
from various agencies in the Commonwealth. No independent verification has  been
made of the following information.
 
    STATE  ECONOMY--Pennsylvania  has been  historically  identified as  a heavy
industry state although that reputation  has changed recently as the  industrial
composition  of the Commonwealth  diversified when the  coal, steel and railroad
industries began to decline. The major new sources of growth in the Commonwealth
are in  the  service  sector,  including trade,  medical  and  health  services,
education and financial institutions. The Commonwealth's agricultural industries
are  also an important component of  its economic structure, accounting for more
than $3.6 billion in crop and livestock products annually while agribusiness and
food related industries support $38 billion in economic activity annually.
 
    Non-agricultural employment within the  Commonwealth has increased  steadily
from  1984 to its 1992 level of 81.3  percent of total employment. The growth in
employment experienced  in  the Commonwealth  is  comparable to  the  nationwide
growth   in  employment  which  has  occurred   during  this  period.  In  1993,
manufacturing  employment  represented  18.4  percent  of  all  non-agricultural
employment  in the  Commonwealth while  the services  sector accounted  for 29.9
percent and the trade sector accounted for 22.4 percent.
 
                                       39
<PAGE>
    The Commonwealth recently experienced a  slowdown in its economy.  Moreover,
economic  strengths and weaknesses vary in  different parts of the Commonwealth.
In general,  heavy  industry  and  manufacturing  have  been  facing  increasing
competition from foreign producers. During 1993, the annual average unemployment
rate  in the Commonwealth was 7.0 percent compared to 6.8 percent for the United
States. For August 1994 the unadjusted unemployment rate was 6.2 percent in  the
Commonwealth and 5.9 percent in the United States, while the seasonally adjusted
unemployment rate for the Commonwealth was 6.3 percent and for the United States
was 6.1 percent.
 
    STATE  BUDGET--The  Commonwealth operates  under an  annual budget  which is
formulated and submitted for legislative approval by the Governor each February.
The Pennsylvania  Constitution  requires  that the  Governor's  budget  proposal
consist  of three parts: (i) a  balanced operating budget setting forth proposed
expenditures and estimated revenues from all sources and, if estimated  revenues
and available surplus are less than proposed expenditures, recommending specific
additional  sources of revenue sufficient to  pay the deficiency; (ii) a capital
budget setting forth proposed expenditures to  be financed from the proceeds  of
obligations  of the  Commonwealth or its  agencies or from  operating funds; and
(iii) a financial plan for not less than the succeeding five fiscal years, which
includes for each year projected  operating expenditures and estimated  revenues
and  projected expenditures for capital projects.  The General Assembly may add,
change or delete  any items  in the  budget prepared  by the  Governor, but  the
Governor  retains veto  power over the  individual appropriations  passed by the
legislature. The Commonwealth's fiscal  year begins on July  1 and ends on  June
30.
 
    All  funds  received by  the Commonwealth  are  subject to  appropriation in
specific amounts by the  General Assembly or by  executive authorization by  the
Governor.  Total appropriations enacted  by the General  Assembly may not exceed
the ensuing  year's  estimated revenues,  plus  (less) the  unappropriated  fund
balance  (deficit) of the preceding year, except for constitutionally authorized
debt service payments. Appropriations from the principal operating funds of  the
Commonwealth  (the General  Fund, the Motor  License Fund and  the State Lottery
Fund)  are  generally  made  for  one  fiscal  year  and  are  returned  to  the
unappropriated  surplus of the fund if not spent or encumbered by the end of the
fiscal year. The Constitution specifies that a surplus of operating funds at the
end of a fiscal year must be appropriated for the ensuing year.
 
    Pennsylvania  uses  the  "fund"  method  of  accounting  for  receipts   and
disbursements. For purposes of government accounting, a "fund" is an independent
fiscal  and accounting entity  with a self-balancing  set of accounts, recording
cash and/or other resources together  with all related liabilities and  equities
that  are  segregated for  the  purpose of  carrying  on specific  activities or
attaining certain objectives in accordance with the fund's special  regulations,
restrictions  or  limitations. In  the Commonwealth,  over  150 funds  have been
established by  legislative  enactment or  in  certain cases  by  administrative
action  for the  purpose of  recording the  receipts and  disbursement of moneys
received by the Commonwealth.  Annual budgets are adopted  each fiscal year  for
the  principal operating  funds of  the Commonwealth  and several  other special
revenue funds. Expenditures  and encumbrances  against these funds  may only  be
made  pursuant to  appropriation measures  enacted by  the General  Assembly and
approved by the  Governor. The  General Fund, the  Commonwealth's largest  fund,
receives  all tax revenues, non-tax revenues and federal grants and entitlements
that are not specified  by law to  be deposited elsewhere.  The majority of  the
Commonwealth's  operating  and  administrative  expenses  are  payable  from the
General Fund. Debt service on all bond indebtedness of the Commonwealth,  except
that  issued for highway  purposes or for  the benefit of  other special revenue
funds, is payable from the General Fund.
 
                                       40
<PAGE>
    Financial information for the principal operating funds of the  Commonwealth
are maintained on a budgetary basis of accounting, which is used for the purpose
of  ensuring compliance with the enacted operating budget. The Commonwealth also
prepares annual  financial  statements  in accordance  with  generally  accepted
accounting principles ("GAAP"). Budgetary basis financial reports are based on a
modified  cash basis  of accounting  as opposed to  a modified  accrual basis of
accounting prescribed  by  GAAP. Financial  information  is adjusted  at  fiscal
year-end  to reflect appropriate accruals  for financial reporting in conformity
with GAAP.
 
    RECENT FINANCIAL  RESULTS--From fiscal  1984,  when the  Commonwealth  first
prepared  its financial  statements on  a GAAP  basis, through  fiscal 1989, the
Commonwealth reported a  positive unreserved-undesignated fund  balance for  its
governmental  fund types at each fiscal year end. Slowing economic growth during
1990, leading to a national economic recession beginning in fiscal 1991, reduced
revenue  growth  and   increased  expenditures  and   contributed  to   negative
unreserved-undesignated  fund balances  at the end  of the 1990  and 1991 fiscal
years. The  negative unreserved-undesignated  fund balance  was due  largely  to
operating  deficits in the General Fund and  the State Lottery Fund during those
fiscal years. Actions taken  during fiscal 1992 to  bring the General Fund  back
into  balance, including tax increases and expenditure restraints, resulted in a
$1.1 billion reduction to the unreserved-undesignated fund deficit for  combined
governmental  fund  types at  June 30,  1993, as  a result  of a  $420.4 million
increase in  the balance.  These gains  were produced  by continued  efforts  to
control  expenditure growth.  The Combined  Balance Sheet  as of  June 30, 1993,
showed total fund  balance and  other credits  for the  total governmental  fund
types  of $1,959.9 million, a  $732.1 million increase from  the balance at June
30, 1992. During  fiscal 1993,  total assets  increased by  $1,296.7 million  to
$7,096.4  million,  while  liabilities  increased  $564.6  million  to  $5,136.5
million.
 
    FISCAL 1991 FINANCIAL RESULTS--The Commonwealth experienced a $453.6 million
general fund  deficit  as of  the  end of  its  1991 fiscal  year.  The  deficit
reflected  higher than  budgeted expenditures,  below-estimate economic activity
and growth rates of economic indicators  and total tax revenue shortfalls  below
those assumed in the enacted budget.
 
    Rising   demands  on  state  programs  caused  by  the  economic  recession,
particularly for  medical  assistance  and cash  assistance  programs,  and  the
increased  costs  of special  education programs  and correction  facilities and
programs, contributed  to  increased  expenditures in  fiscal  1991,  while  tax
revenues  for  the  1991 fiscal  year  were  severely affected  by  the economic
recession. Total corporation tax receipts and sales and use tax receipts  during
fiscal  1991  were,  respectively, 7.3  percent  and 0.9  percent  below amounts
collected during fiscal 1990. Personal income tax receipts also were affected by
the recession but  not to  the extent  of the  other major  General Fund  taxes,
increasing only 2.0 percent over fiscal 1990 collections.
 
    A   number  of  actions  were  taken  throughout  the  fiscal  year  by  the
Commonwealth to mitigate  the effects of  the recession on  budget revenues  and
expenditures.  The  Commonwealth  initiated a  number  of  cost-saving measures,
including the  firing  of  2,000  state employees,  deferral  of  paychecks  and
reduction  of funds to state universities,  which resulted in approximately $871
million cost savings.
 
    FISCAL 1992 FINANCIAL RESULTS--Actions taken during fiscal 1992 to bring the
General Fund budget back into  balance, including tax increases and  expenditure
restraints  resulted in a $1.1 billion reduction for the unreserved-undesignated
fund deficit for  combined governmental fund  types and a  return to a  positive
fund  balance.  Total  General  Fund revenues  for  fiscal  1992  were $14,516.8
million,   which   is    approximately   22   percent    higher   than    fiscal
 
                                       41
<PAGE>
1991  revenues of  $11,877.3 million  due in  large part  to tax  increases. The
increased revenues funded  substantial increases in  education, social  services
and  corrections  programs.  As  a  result  of  the  tax  increases  and certain
appropriation lapses,  fiscal 1992  ended  with an  $8.8 million  surplus  after
having  started the year with an  unappropriated General Fund balance deficit of
$453.6 million.
 
    FISCAL 1993 FINANCIAL RESULTS--Fiscal 1993 closed with revenues higher  than
anticipated  and expenditures approximately as projected, resulting in an ending
unappropriated balance surplus of  $242.3 million. A  deduction in the  personal
income  tax  rate  in  July  1992 and  the  one-time  receipt  of  revenues from
retroactive corporate tax increases  in fiscal 1992  were responsible, in  part,
for the low growth in fiscal 1993.
 
    FISCAL  1994 FINANCIAL RESULTS--Commonwealth revenues during the 1994 fiscal
year totaled $15,210.7 million,  $38.6 million above  the fiscal year  estimate,
and  3.9 percent  over commonwealth  revenues during  the 1993  fiscal year. The
sales tax was an  important contributor to the  higher than estimated  revenues.
The  strength of collections from  the sales tax offset  the lower than budgeted
performance of the  personal income tax  that ended the  1994 fiscal year  $74.4
million below estimate. The shortfall in the personal income tax was largely due
to  shortfalls in income not subject  to withholding such as interest, dividends
and other income. Expenditures, excluding pooled financing expenditures and  net
of  all fiscal 1994 appropriation lapses, totaled $14,934.4 million representing
a 7.2 percent  increase over  fiscal 1993 expenditures.  Medical assistance  and
prisons  spending contributed to the rate of spending growth for the 1994 fiscal
year. The Commonwealth maintained an operating balance on a budgetary basis  for
fiscal  1994 producing  a fiscal  year ending  unappropriated surplus  of $335.8
million.
 
    FISCAL 1995 BUDGET--On June  16, 1994, the Governor  signed a $15.7  billion
general  fund budget, an  increase of over  3.9% from the  Fiscal 1994 budget. A
substantial  amount  of  the  increase   is  targeted  for  medical   assistance
expenditures, reform of the state-funded public assistance program and education
subsidies  to local  school districts. The  budget also  includes tax reductions
totaling an estimated $166.4 million benefiting principally low income  families
and  corporations. The fiscal 1995 budget  projects a $4 million fiscal year-end
unappropriated surplus.
 
    DEBT LIMITS AND OUTSTANDING DEBT--The Pennsylvania Constitution permits  the
issuance  of the following types  of debt: (i) debt  to suppress insurrection or
rehabilitate areas affected  by disaster; (ii)  electorate approved debt;  (iii)
debt for capital projects subject to an aggregate outstanding debt limit of 1.75
times  the annual average tax  revenues of the preceding  five fiscal years; and
(iv) tax anticipation notes payable in the fiscal year of issuance.
 
    Under the Pennsylvania Fiscal Code, the Auditor General is required annually
to certify  to  the  Governor  and  the  General  Assembly  certain  information
regarding  the Commonwealth's indebtedness. According to the most recent Auditor
General certificate, the average annual tax  revenues deposited in all funds  in
the  five fiscal years ended June 30, 1993 was $14.5 billion, and therefore, the
net debt limitation for the 1994  fiscal year is $27.1 billion. Outstanding  net
debt totaled $5.1 billion at June 30, 1994, an increase of $37 million from June
30,  1993. At  February 28,  1994, the amount  of debt  authorized by  law to be
issued, but not yet incurred was $15.0 billion.
 
    DEBT RATINGS--All outstanding general  obligation bonds of the  Commonwealth
are rated AA- by S&P and A1 by Moody's.
 
    CITY   OF   PHILADELPHIA--The   City   of   Philadelphia   (the   "City"  or
"Philadelphia")  is  the   largest  city  in   the  Commonwealth.   Philadelphia
experienced a series of general fund deficits
 
                                       42
<PAGE>
for  fiscal years 1988 through 1992 which  have culminated in the City's present
serious financial  difficulties.  In  its 1992  Comprehensive  Annual  Financial
Report, Philadelphia reported a cumulative general fund deficit of $71.4 million
for fiscal year 1992.
 
    In  June  1991, the  Pennsylvania  legislature established  the Pennsylvania
Intergovernmental Cooperation  Authority  ("PICA"), a  five-member  board  which
oversees  the  fiscal  affairs  of the  City  of  Philadelphia.  The Legislation
empowers PICA  to issue  notes and  bonds on  behalf of  Philadelphia, and  also
authorizes  Philadelphia to levy  a one-percent sales tax  the proceeds of which
would be used  to pay off  the bonds.  In return for  PICA's fiscal  assistance,
Philadelphia is required, among other things, to establish a five-year financial
plans   that  include  balanced  annual   budgets.  Under  the  legislation,  if
Philadelphia does  not comply  with such  requirements, PICA  may withhold  bond
revenues and certain state funding.
 
    At  this time, the City is operating  under a five-year fiscal plan approved
by PICA on April 6, 1992. Full implementation of the five-year plan was  delayed
due  to labor  negotiations that  were not  completed until  October 1992, three
months after the expiration  of the old  labor contracts. The  terms of the  new
labor  contracts are  estimated to cost  approximately $144.4  million more than
what was budgeted in the original five-year plan. An amended five-year plan  was
approved  by  PICA in  May  1993. The  Mayor's  latest update  of  the five-year
financial plan was approved by PICA on May 2, 1994.
 
    On June 5,  1992, PICA sold  approximately $480 million  in bonds at  yields
ranging  from 5.25 percent to 6.88 percent.  The proceeds of the bonds were used
to cover shortfalls accumulated over  fiscal years 1988 through 1991,  projected
deficits for fiscal years 1992 and 1993, construction projects and other capital
expenditures. In accordance with the enabling legislation, PICA was guaranteed a
percentage  of the wage  tax revenue expected to  be collected from Philadelphia
residents to permit repayment of the bonds.  In July 1993 and August 1993,  PICA
issued  $643.4 million and $178.7 million,  respectively, of special Tax Revenue
Bonds to  refund  certain general  obligation  bonds of  the  City and  to  fund
additional capital projects.
 
    In  January 1993, Philadelphia anticipated  a cumulative general fund budget
deficit of $57 million for the 1993 fiscal year. In response to the  anticipated
deficit,  the Mayor unveiled a financial plan eliminating the budget deficit for
the 1993 budget year  through significant service cuts  that included a plan  to
privatize  certain city  provided services. Due  to an upsurge  in tax receipts,
cost-cutting and  additional PICA  borrowings, Philadelphia  completed the  1993
fiscal  year with a balanced general fund  budget. The audit findings for fiscal
1993 show a surplus of  approximately $3 million of  the fiscal year ended  June
30, 1993.
 
    In  January 1994, the Mayor proposed a $2.3 billion city general fund budget
that included no  tax increases,  no significant service  cuts and  a series  of
modest  health  and welfare  program  increases. At  that  time, the  Mayor also
unveiled a $2.2 billion program  (the "Philadelphia Economic Stimulus  Program")
designed  to stimulate Philadelphia's economy and stop  the loss of 1,000 jobs a
month. However, the success  of the Philadelphia  Economic Stimulus Program  has
been predicated upon several contingencies including, among others, $250 million
in  revenues from riverboat gambling over the next three years, which first must
be approved by the state legislature,  and $100 million in federal  "empowerment
zone"  subsidies, which Philadelphia may or may not receive. As of January 1994,
the 1994  general fund  budget was  running at  a deficit  of approximately  $10
million.  The Mayor has predicted that the  general fund will be balanced by the
end of the 1994 fiscal  year. The fiscal 1994 budget  projects no deficit and  a
balanced budget for the year ended June 30, 1994.
 
                                       43
<PAGE>
    The  Standard & Poor's Corporation rating on Philadelphia general obligation
bonds is "BB." The Moody's Investors Service rating is currently "Ba."
 
    LITIGATION--The Commonwealth is  a party  to numerous lawsuits  in which  an
adverse  final decision could materially  affect the Commonwealth's governmental
operations and consequently its ability to pay debt service on its  obligations.
The  Commonwealth also faces tort claims made  possible by the limited waiver of
sovereign immunity effected by Act 152, approved September 28, 1978.
 
PENNSYLVANIA TAXABLE ESTIMATED CURRENT RETURN TABLE
 
    The following tables show the approximate taxable estimated current  returns
for  individuals  that are  equivalent to  tax-exempt estimated  current returns
under combined Federal and  state taxes, using  published 1994 marginal  Federal
tax  rates and marginal state tax rates  currently available and scheduled to be
in  effect.  The  tables  incorporate  increased  tax  rates  for  higher-income
taxpayers  that were  included in  the Revenue  Reconciliation Act  of 1993. For
cases in which more than one state  bracket falls within a Federal bracket,  the
highest  state bracket is combined with  the Federal bracket. The combined state
and Federal tax  brackets shown  reflect the fact  that state  tax payments  are
currently  deductible for Federal  tax purposes. The  tables illustrate what you
would have to  earn on  taxable investments  to equal  the tax-exempt  estimated
current  return for your income  tax bracket. A taxpayer's  marginal tax rate is
affected by both his taxable income  and his adjusted gross income. Locate  your
adjusted  gross and  your taxable  income (which  is your  adjusted gross income
reduced by any deductions and exemptions), then locate your tax bracket based on
joint or single  tax filing.  Read across  to the  equivalent taxable  estimated
current return you would need to match the tax-free income.
 
                                       44
<PAGE>
 COMBINED MARGINAL TAX RATES FOR JOINT TAXPAYERS WITH FOUR PERSONAL EXEMPTIONS
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL
    FEDERAL      ADJUSTED      COMBINED
    TAXABLE        GROSS      STATE* AND                   TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME        FEDERAL       --------------------------------------------------------------
   (1,000'S)     (1,000'S)     TAX RATE1      5.00%   5.25%   5.50%   5.75%   6.00%   6.25%   6.50%   6.75%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 38.0 $     0-111.8      17.5   %     6.06    6.36    6.67    6.97    7.27    7.58    7.88    8.18
    38.0- 91.9       0-111.8      30.0         7.14    7.50    7.86    8.21    8.57    8.93    9.29    9.64
                 111.8-167.7      31.0         7.25    7.61    7.97    8.33    8.70    9.06    9.42    9.78
    91.9-140.0       0-111.8      33.0         7.46    7.84    8.21    8.58    8.96    9.33    9.70   10.07
                 111.8-167.7      34.0         7.58    7.95    8.33    8.71    9.09    9.47    9.85   10.23
                 167.7-290.2      36.0         7.81    8.20    8.59    8.98    9.38    9.77   10.16   10.55
   140.0-250.0   111.8-167.7      39.0         8.20    8.61    9.02    9.43    9.84   10.25   10.66   11.07
                 167.7-290.2      41.5         8.55    8.97    9.40    9.83   10.26   10.68   11.11   11.54
                  Over 290.2      39.0   2     8.20    8.61    9.02    9.43    9.84   10.25   10.66   11.07
    Over 250.0   167.7-290.2      45.5         9.17    9.63   10.09   10.55   11.01   11.47   11.93   12.39
                  Over 290.2      42.5   3     8.70    9.13    9.57   10.00   10.43   10.87   11.30   11.74
</TABLE>
 
  COMBINED MARGINAL TAX RATES FOR SINGLE TAXPAYERS WITH ONE PERSONAL EXEMPTION
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                  FEDERAL
    FEDERAL      ADJUSTED      COMBINED
    TAXABLE        GROSS      STATE* AND                   TAX-EXEMPT ESTIMATED CURRENT RETURN
    INCOME        INCOME        FEDERAL       --------------------------------------------------------------
   (1,000'S)     (1,000'S)     TAX RATE1      5.00%   5.25%   5.50%   5.75%   6.00%   6.25%   6.50%   6.75%
 ------------- -------------  -----------     ------  ------  ------  ------  ------  ------  ------  ------
 <S>           <C>            <C>             <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
 $     0- 22.8 $     0-111.8      17.5         6.06    6.36    6.67    6.97    7.27    7.58    7.88    8.18
    22.8- 55.1       0-111.8      30.0         7.14    7.50    7.86    8.21    8.57    8.93    9.29    9.64
    55.1-115.0       0-111.8      33.0         7.46    7.84    8.21    8.58    8.96    9.33    9.70   10.07
                 111.8-234.3      34.5         7.63    8.02    8.40    8.78    9.16    9.54    9.92   10.31
   115.0-250.0   111.8-234.3      39.5         8.26    8.68    9.09    9.50    9.92   10.33   10.74   11.16
                  Over 234.3      39.0   2     8.20    8.61    9.02    9.43    9.84   10.25   10.66   11.07
    Over 250.0    Over 234.3      42.5   3     8.70    9.13    9.57   10.00   10.43   10.87   11.30   11.74
<FN>
- ------------------
      1  The table reflects the effect of the limitations on  itemized deductions and the deduction for personal exemptions. They
were designed to phase out certain benefits of these deductions for higher income taxpayers. These limitations, in effect,  raise
the  current maximum marginal Federal tax rate to approximately 44.0  percent for taxpayers filing a joint return and entitled to
four personal exemptions and to  approximately 41.0 percent for  taxpayers filing a single return  entitled to only one  personal
exemption.  These limitations are  subject to certain maximums,  which depend on  the number of exemptions  claimed and the total
amount of the taxpayer's itemized  deductions. For example, the  limitation on itemized deductions will  not cause a taxpayer  to
lose more than 80% of his allowable itemized deductions, with certain exceptions.
      2 Federal tax rate reverts to 36.0% after the 80% cap on the limitation on itemized deductions has been met.
      3 Federal tax rate reverts to 39.6% after the 80% cap on the limitation on itemized deductions has been met.
</TABLE>
 
    A  comparison of tax-free  and equivalent taxable  estimated current returns
with the returns on  various taxable investments is  one element to consider  in
making  an  investment  decision. The  Sponsor  may  from time  to  time  in its
advertising and sales materials  compare the then  current estimated returns  on
the Trust and returns over specified periods on other similar Nuveen Trusts with
returns  on taxable investments such as corporate or U.S. Government bonds, bank
CD's and  money  market  accounts or  money  market  funds, each  of  which  has
investment  characteristics  that  may  differ from  those  of  the  Trust. U.S.
Government bonds, for example, are  backed by the full  faith and credit of  the
U.S. Government and bank CD's and money market accounts are insured by an agency
of  the federal government. Money market accounts and money market funds provide
stability of principal, but pay interest  at rates that vary with the  condition
of  the short-term debt market. The  investment characteristics of the Trust are
described more fully elsewhere in this Prospectus.
 
                                       45
<PAGE>
   
NUVEEN TAX-EXEMPT UNIT TRUST
SCHEDULE OF INVESTMENTS AT DATE OF DEPOSIT
NOVEMBER 22, 1994
PENNSYLVANIA INSURED TRUST 190
(SERIES 768)
    
 
<TABLE>
<CAPTION>
                                                                                          Ratings(3)           Trustee's
                                                                      Optional       ---------------------   Determination
 Aggregate        Name of Issuer and Title of Issue Represented      Redemption       Standard                of Offering
  Principal        by Sponsor's Contracts to Purchase Bonds(1)      Provisions(2)     & Poor's    Moody's      Price(4)
<C>          <C> <S>                                              <C>                <C>         <C>        <C>
- ---------------------------------------------------------------------------------------------------------------------------
$   500,000      Pennsylvania Intergovernmental Cooperation          2003 at 100        AAA         Aaa     $       425,155
                   Authority, Special Tax Revenue Bonds (City of
                   Philadelphia Funding Program), Series of
                   1993, 5.75% Due 6/15/15.
    500,000      Berks County Municipal Authority                    2004 at 102        AAA         Aaa             439,455
                   (Pennsylvania), Hospital Revenue Bonds (The
                   Reading Hospital and Medical Center Project),
                   Series B of 1994, 6.00% Due 10/1/14.
    500,000      Lehigh County Industrial Development Authority,     2004 at 102        AAA         Aaa             452,040
                   Pollution Control Revenue Refunding Bonds,
                   1994 Series B (Pennsylvania Power & Light
                   Company Project), 6.40% Due 9/1/29.
    500,000      Lehigh County, Pennsylvania, General Purpose        2004 at 102        AAA         Aaa             426,180
                   Authority, Hospital Revenue Bonds (Lehigh
                   Valley Hospital, Inc.), Series A of 1994,
                   6.00% Due 7/1/25. (Original issue discount
                   bonds delivered on or about April 14, 1994 at
                   a price of 93.973% of principal amount.)
    500,000      Montgomery County Higher Education and Health       2002 at 102        AAA         Aaa             460,840
                   Authority, Montgomery County, Pennsylvania,
                   Saint Joseph's University Revenue Bonds,
                   Series of 1992, 6.50% Due 12/15/22.
    500,000      Northampton County Higher Education Authority       2002 at 102        AAA         Aaa             420,245
                   (Pennsylvania), University Revenue Bonds
                   (Lehigh University), Series A of 1993, 5.75%
                   Due 11/15/18.
    500,000      Commonwealth of Puerto Rico, Public Improvement   2004 at 101 1/2      AAA         Aaa             466,315
                   Bonds of 1994 (General Obligation Bonds),
                   6.50% Due 7/1/23.
- -----------                                                                                                 ---------------
$ 3,500,000                                                                                                 $     3,090,230
- -----------                                                                                                 ---------------
- -----------                                                                                                 ---------------
</TABLE>
 
See Notes to Schedules of Investments, page 47.
 
                                       46
<PAGE>
NOTES TO SCHEDULES OF INVESTMENTS
 
    (1) Contracts,  which  are  "when-issued"  or  "regular  way"  contracts  or
        contracts having delivery dates beyond the normal settlement date,  have
        been  deposited with the Trustee on the Date of Deposit. The performance
        of such contracts is secured by an irrevocable letter of credit,  issued
        by  a major commercial bank, which  has been deposited with the Trustee.
        At the Date  of Deposit, Bonds  may have been  delivered to the  Sponsor
        pursuant  to certain of these contracts; the Sponsor has assigned to the
        Trustee all of its right, title and interest in and to such Bonds.
 
    (2) The Bonds are first subject to optional redemption in the years, and  at
        the  prices, shown.  Unless otherwise  indicated, the  Bonds, except for
        Bonds issued at a substantial original issue discount, are redeemable at
        declining prices (but not below par value) in subsequent years. Original
        issue  discount  bonds,  including  zero  coupon  bonds,  are  generally
        redeemable  at  prices  based on  the  issue  price plus  the  amount of
        original issue discount accreted to redemption plus, if applicable, some
        premium, the amount of which will decline in subsequent years. The Bonds
        may also be subject to sinking fund redemption without premium prior  to
        the dates shown.
 
        Certain  Bonds may be subject to redemption without premium prior to the
        date shown  pursuant  to  special  or  mandatory  call  provisions;  for
        example,  if bond proceeds are not able  to be used as contemplated, the
        project is condemned or sold, or the project is destroyed and  insurance
        proceeds  are used to  redeem the bonds.  Single family mortgage revenue
        bonds and housing authority bonds are  most likely to be called  subject
        to  such provisions, but other bonds may have similar call features. See
        Section 4 and "General Trust Information" in this Section.
 
        The Trustee's determination of the offering prices of Bonds in the  Fund
        may  be  greater or  less than  the  amounts that  may be  received upon
        redemption or  maturity  of  such Bonds.  Subject  to  rules  concerning
        amortization  of bond  premium and of  original issue  discount, gain or
        loss realized  by  the Trustee  on  disposition  of any  Bonds  will  be
        recognized  as taxable capital gain or loss by Unitholders. (See Section
        4.)
 
    (3) See "Description  of  Ratings" herein.  All  the Bonds  in  the  Insured
        Trusts,  as insured by the  Insurer, are rated AAA  by Standard & Poor's
        Corporation and Aaa by Moody's Investors Service, Inc. (See Section 5.)
 
    (4) As determined by Kenny S&P Evaluation Services on behalf of the  Trustee
        as  of the close of  business on the business  day preceding the Date of
        Deposit. The prices as determined by Kenny S&P Evaluation Services  have
        been rounded to the nearest dollar.
 
                                       47
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
   
     TO  THE  BOARD OF  DIRECTORS  OF JOHN  NUVEEN  & CO.  INCORPORATED AND
     UNITHOLDERS OF NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 768:
    
 
   
       We have audited  the accompanying  statements of  condition and  the
     related  schedules of investments at date  of deposit (included in the
     prospectus  herein)  of  Nuveen  Tax-Exempt  Unit  Trust,  Series  768
     (comprising  California Insured Trust 236,  Colorado Insured Trust 54,
     Georgia Insured Trust 41  and Pennsylvania Insured  Trust 190), as  of
     November  22, 1994. These financial  statements are the responsibility
     of the Sponsor. Our responsibility is  to express an opinion on  these
     financial statements based on our audits.
    
 
       We  conducted  our  audits  in  accordance  with  generally accepted
     auditing standards. Those standards require  that we plan and  perform
     the  audit to obtain reasonable  assurance about whether the financial
     statements are  free  of  material  misstatement.  An  audit  includes
     examining,  on  a  test  basis, evidence  supporting  the  amounts and
     disclosures in  the  financial  statements.  Our  procedures  included
     confirmation  of the irrevocable letter  of credit arrangement for the
     purchase of securities,  described in  Note (1) to  the statements  of
     condition,  by correspondence with the Trustee. An audit also includes
     assessing the  accounting principles  used and  significant  estimates
     made  by  the Sponsor,  as well  as  evaluating the  overall financial
     statement  presentation.  We  believe   that  our  audits  provide   a
     reasonable basis for our opinion.
 
   
       In  our  opinion,  the  statements  of  condition  and  the  related
     schedules of investments at date of deposit referred to above  present
     fairly,  in all material  respects, the financial  position of each of
     the trusts constituting the Nuveen  Tax-Exempt Unit Trust, Series  768
     as  of  November  22,  1994,  in  conformity  with  generally accepted
     accounting principles.
    
 
                                                        ARTHUR ANDERSEN LLP
 
   
     Chicago, Illinois,
     November 22, 1994.
    
 
                                       48
<PAGE>
                            Statements of Condition
   
                    NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 768
    
   
(California Insured Trust 236, Colorado Insured Trust 54, Georgia Insured Trust
                     41 and Pennsylvania Insured Trust 190)
    
   
                            AS OF NOVEMBER 22, 1994
    
 
<TABLE>
<CAPTION>
                                            CALIFORNIA           COLORADO             GEORGIA          PENNSYLVANIA
                                              INSURED             INSURED             INSURED             INSURED
    TRUST PROPERTY                           TRUST 236           TRUST 54            TRUST 41            TRUST 190
<S>                                       <C>                 <C>                 <C>                 <C>
                                          ---------------     ---------------     ---------------     ---------------
Sponsor's contracts to purchase Tax-
 Exempt Bonds, backed by an irrevocable
 letter of credit(1)(2).................  $     3,067,130     $     3,100,120     $     3,071,400     $     3,090,230
Accrued interest to November 22, 1994 on
  underlying Bonds(1)...................           60,845              49,918              66,876              76,117
                                          ---------------     ---------------     ---------------     ---------------
            Total.......................  $     3,127,975     $     3,150,038     $     3,138,276     $     3,166,347
                                          ---------------     ---------------     ---------------     ---------------
                                          ---------------     ---------------     ---------------     ---------------
   LIABILITY AND INTEREST OF UNITHOLDERS
LIABILITY:
    Accrued interest to November 22,
      1994 on underlying Bonds(3).......  $        60,845     $        49,918     $        66,876     $        76,117
                                          ---------------     ---------------     ---------------     ---------------
INTEREST OF UNITHOLDERS:
    Units of fractional undivided
      interest outstanding (California
      Insured Trust 236 --35,000;
      Colorado Insured Trust 54--35,000;
      Georgia Insured Trust 41--35,000;
      Pennsylvania Insured Trust
      190--35,000)
      Cost to investors(4)..............  $     3,225,149     $     3,259,838     $     3,229,639     $     3,249,439
        Less: Gross underwriting
          commission(5).................         (158,019)           (159,718)           (158,239)           (159,209)
                                          ---------------     ---------------     ---------------     ---------------
    Net amount applicable to
      investors.........................  $     3,067,130     $     3,100,120     $     3,071,400     $     3,090,230
                                          ---------------     ---------------     ---------------     ---------------
            Total.......................  $     3,127,975     $     3,150,038     $     3,138,276     $     3,166,347
                                          ---------------     ---------------     ---------------     ---------------
                                          ---------------     ---------------     ---------------     ---------------
<FN>
(1) Represented by contracts  to purchase Tax-Exempt  Bonds which include "when  issued" or "regular  way" or "delayed  delivery"
    contracts  for which an irrevocable letter of  credit issued by a major commercial  bank has been deposited with the Trustee.
    The amount of such letter of credit  and any cash deposited exceeds the amount  necessary for the purchase of the Bonds  plus
    accrued  interest to the Date of  Deposit. At the Date of  Deposit, Bonds may have been  delivered to the Sponsor pursuant to
    certain of these contracts; the  Sponsor has assigned to  the Trustee all of  its rights, title and  interest in and to  such
    Bonds.
(2)  Aggregate value (at offering prices) as of the Date of  Deposit of the Bonds listed under "Schedules of Investments" herein,
    and their aggregate cost to the Trusts are the same. Such offering prices were determined by Kenny S&P Evaluation Services as
    of the close of business on the business day prior to the Date of Deposit. (See Section 10.) Insurance coverage providing for
    the timely payment, when due, of all principal  of and interest on the Bonds in  the Insured Trusts has been obtained by  the
    Sponsor  or by the issuers of such Bonds. Such insurance does not guarantee the market value of the Bonds or the value of the
    Units. Both the bid and the offering prices of the underlying  Bonds and of the Units may include value attributable to  such
    policies of insurance.
(3) Representing, as set forth in Section 8, advancement by the Trustee of an amount equal to the accrued Bond interest as of the
    Date of Deposit from the later of the last payment date on the Bonds or the date of issuance thereof.
(4) Aggregate Public Offering Price (exclusive of accrued interest) computed as set forth under Section 6.
(5) The gross underwriting commission has been calculated on the assumption that the Units offered by this prospectus are sold in
    single transactions involving less than $50,000 or 500 Units. At this level, the sales charge is 4.90% of the Public Offering
    Price  in the case of National and State Trusts, 4.25% thereof in  the case of Long Intermediate Trusts, 3.90% in the case of
    Intermediate Trusts, 3.00% in the  case of Short Intermediate Trusts  and 2.50% in the case  of Short Term Trusts. In  single
    transactions involving 500 Units or more, the sales charge is reduced. (See Section 6.)
</TABLE>
 
                                       49
<PAGE>
GENERAL TRUST INFORMATION
 
    RISK FACTORS.
 
    An  investment in Units of any Trust should be made with an understanding of
the risks that such an investment may  entail. These include the ability of  the
issuer,  or,  if  applicable,  an  insurer, to  make  payments  of  interest and
principal when due, the  effects of changes in  interest rates generally,  early
call provisions and the potential for changes in the tax status of the Bonds. As
set  forth  in the  portfolio  summaries above,  the  Trusts may  contain  or be
concentrated in one or more of the types of bonds discussed below. The following
paragraphs discuss certain circumstances which may adversely affect the  ability
of  issuers  of Bonds  held  in the  portfolio  of a  Trust  to make  payment of
principal and interest thereon or which may adversely affect the ratings of such
Bonds; with  respect  to  Insured  Trusts, however,  because  of  the  insurance
obtained  by the Sponsor or by the issuers of the Bonds, such changes should not
adversely affect  an Insured  Trust's  receipt of  principal and  interest,  the
Standard  & Poor's AAA or Moody's Aaa ratings  of the Bonds in the Insured Trust
portfolio, or the Standard & Poor's AAA rating of the Units of each such Insured
Trust. For  economic risks  specific  to the  individual Trusts,  see  "Economic
Factors" for each Trust.
 
    HEALTH  FACILITY  OBLIGATIONS.    Some  of  the  Bonds  in  a  Trust  may be
obligations of  issuers whose  revenues are  derived from  services provided  by
hospitals  or other health care facilities,  including nursing homes. Ratings of
bonds issued  for health  care  facilities are  sometimes based  on  feasibility
studies  that contain projections of occupancy  levels, revenues and expenses. A
facility's gross  receipts and  net income  available for  debt service  may  be
affected  by future events and conditions  including, among other things, demand
for services, the ability of the  facility to provide the services required,  an
increasing  shortage of qualified nurses or a dramatic rise in nursing salaries,
physicians'  confidence  in  the  facility,  management  capabilities,  economic
developments  in  the service  area, competition  from other  similar providers,
efforts by  insurers  and  governmental agencies  to  limit  rates,  legislation
establishing  state rate-setting agencies,  expenses, government regulation, the
cost and possible unavailability of  malpractice insurance, and the  termination
or  restriction of governmental financial  assistance, including that associated
with Medicare, Medicaid and other  similar third party payor programs.  Medicare
reimbursements are currently calculated on a prospective basis and are not based
on  a provider's actual costs. Such method of reimbursement may adversely affect
reimbursements to hospitals and other facilities for services provided under the
Medicare program and thereby may have an  adverse effect on the ability of  such
institutions  to satisfy  debt service requirements.  In the event  of a default
upon a bond  secured by hospital  facilities, the limited  alternative uses  for
such  facilities may result  in the recovery upon  such collateral not providing
sufficient funds to fully repay the bonds.
 
    Certain hospital  bonds  provide for  redemption  at par  upon  the  damage,
destruction  or  condemnation of  the hospital  facilities  or in  other special
circumstances.
 
    HOUSING OBLIGATIONS.  Some  of the Bonds  in a Trust  may be obligations  of
issuers  whose revenues  are primarily  derived from  mortgage loans  to housing
projects for  low  to  moderate  income  families.  Such  issues  are  generally
characterized  by mandatory redemption at par or,  in the case of original issue
discount bonds, accreted  value in  the event of  economic defaults  and in  the
event of a failure of the operator of a project to comply with certain covenants
as  to the  operation of  the project.  The failure  of such  operator to comply
 
                                      A-1
<PAGE>
with certain  covenants related  to the  tax-exempt status  of interest  on  the
Bonds,  such as  provisions requiring  that a  specified percentage  of units be
rented or available for rental to  low or moderate income families,  potentially
could cause interest on such Bonds to be subject to Federal income taxation from
the  date of  issuance of the  Bonds. The ability  of such issuers  to make debt
service payments will be  affected by events  and conditions affecting  financed
projects,  including,  among other  things, the  achievement and  maintenance of
sufficient occupancy levels  and adequate rental  income, employment and  income
conditions  prevailing in local labor markets, increases in taxes, utility costs
and other  operating  expenses,  the managerial  ability  of  project  managers,
changes  in laws and  governmental regulations, the  appropriation of subsidies,
and social and economic  trends affecting the localities  in which the  projects
are  located. Occupancy  of such housing  projects may be  adversely affected by
high rent  levels  and  income  limitations  imposed  under  Federal  and  state
programs.
 
    SINGLE  FAMILY MORTGAGE REVENUE BONDS.  Some of  the Bonds in a Trust may be
single family  mortgage revenue  bonds,  which are  issued  for the  purpose  of
acquiring  from originating financial institutions notes secured by mortgages on
residences located within the issuer's boundaries and owned by persons of low or
moderate income. Mortgage  loans are generally  partially or completely  prepaid
prior  to their  final maturities  as a  result of  events such  as sale  of the
mortgaged premises, default, condemnation or casualty loss. Because these  bonds
are  subject to extraordinary mandatory redemption in whole or in part from such
prepayments of mortgage loans, a substantial portion of such bonds will probably
be redeemed prior to their scheduled maturities or even prior to their  ordinary
call dates. Extraordinary mandatory redemption without premium could also result
from  the failure  of the  originating financial  institutions to  make mortgage
loans in sufficient amounts within a specified time period. The redemption price
of such  issues may  be more  or less  than the  offering price  of such  bonds.
Additionally,  unusually high rates of default  on the underlying mortgage loans
may reduce revenues  available for the  payment of principal  of or interest  on
such  mortgage revenue bonds. Single family  mortgage revenue bonds issued after
December 31, 1980 were issued under Section 103A of the Internal Revenue Code of
1954, as amended, or  Section 143 of  the Internal Revenue  Code of 1986,  which
Sections  contain certain  requirements relating to  the use of  the proceeds of
such bonds in  order for the  interest on  such bonds to  retain its  tax-exempt
status.  In each  case, the issuer  of the  bonds has covenanted  to comply with
applicable requirements and bond  counsel to such issuer  has issued an  opinion
that  the interest on the bonds is exempt from Federal income tax under existing
laws  and  regulations.  There  can   be  no  assurance  that  such   continuing
requirements  will be  satisfied; the  failure to  meet such  requirements could
cause interest on the Bonds to  be subject to Federal income taxation,  possibly
from the date of issuance of the Bonds.
 
    FEDERALLY  ENHANCED OBLIGATIONS.   Some  of the  mortgages which  secure the
various health care or housing projects which underlie the previously  discussed
Health  Facility, Housing, and  Single Family Mortgage  Revenue Obligations (the
"Obligations") in a Trust may be  insured by the Federal Housing  Administration
("FHA").  Under FHA  regulations, the  maximum insurable  mortgage amount cannot
exceed 90%  of  the FHA's  estimated  value of  the  project. The  FHA  mortgage
insurance  does not constitute a guarantee of timely payment of the principal of
and interest on the Obligations. Payment  of mortgage insurance benefits may  be
(1)  less than the principal amount of Obligations outstanding or (2) delayed if
disputes arise as to  the amount of  the payment or if  certain notices are  not
given
 
                                      A-2
<PAGE>
to  the  FHA  within the  prescribed  time  periods. In  addition,  some  of the
previously discussed Obligations may be secured by mortgage-backed  certificates
guaranteed  by the Government  National Mortgage Association  ("GNMA"), a wholly
owned corporate  instrumentality  of  the  United  States,  and/or  the  Federal
National   Mortgage  Association  ("Fannie  Mae")   a  federally  chartered  and
stockholder-owed corporation. GNMA  and Fannie Mae  guarantee timely payment  of
principal  and  interest on  the  mortgage-backed certificates,  even  where the
underlying  mortgage  payments   are  not  made.   While  such   mortgage-backed
certificates  are often pledged  to secure payment of  principal and interest on
the Obligations, timely payment of interest and principal on the Obligations  is
not  insured or guaranteed by  the United States, GNMA,  Fannie Mae or any other
governmental agency or  instrumentality. The  GNMA mortgage-backed  certificates
constitute  a general obligation of  the United States backed  by its full faith
and credit. The obligations of Fannie  Mae, including its obligations under  the
Fannie  Mae mortgage-backed securities, are obligations solely of Fannie Mae and
are not backed  by, or  entitled to,  the full faith  and credit  of the  United
States.
 
    INDUSTRIAL  REVENUE OBLIGATIONS.   Certain  of the Bonds  in a  Trust may be
industrial revenue bonds  ("IRBs"), including pollution  control revenue  bonds,
which  are  tax-exempt  securities  issued  by  states,  municipalities,  public
authorities or similar entities to  finance the cost of acquiring,  constructing
or improving various industrial projects. These projects are usually operated by
corporate entities. Issuers are obligated only to pay amounts due on the IRBs to
the  extent that funds are available from the unexpended proceeds of the IRBs or
receipts or revenues of the issuer  under an arrangement between the issuer  and
the  corporate operator of  a project. The arrangement  may be in  the form of a
lease, installment sale agreement, conditional sale agreement or loan agreement,
but in each case  the payments to  the issuer are designed  to be sufficient  to
meet  the payments  of amounts  due on  the IRBs.  Regardless of  the structure,
payment of IRBs is solely dependent  upon the creditworthiness of the  corporate
operator  of  the project  and,  if applicable,  corporate  guarantor. Corporate
operators or  guarantors may  be affected  by  many factors  which may  have  an
adverse  impact on  the credit  quality of  the particular  company or industry.
These include cyclicality of revenues and earnings, regulatory and environmental
restrictions, litigation  resulting  from  accidents  or  environmentally-caused
illnesses,  extensive competition  and financial deterioration  resulting from a
corporate restructuring pursuant to a leveraged buy-out, takeover or  otherwise.
Such  a restructuring may  result in the  operator of a  project becoming highly
leveraged which may have an impact on such operator's creditworthiness which  in
turn  would have  an adverse impact  on the  rating and/or market  value of such
Bonds. Further, the  possibility of  such a  restructuring may  have an  adverse
impact  on the market for and consequently  the value of such Bonds, even though
no actual takeover or other action is ever contemplated or effected. The IRBs in
a Trust may be subject to  special or extraordinary redemption provisions  which
may  provide for redemption  at par or,  in the case  of original issue discount
bonds, accreted value. The  Sponsor cannot predict the  causes or likelihood  of
the redemption of IRBs in a Trust prior to the stated maturity of such Bonds.
 
    ELECTRIC  UTILITY  OBLIGATIONS.    Some  of the  Bonds  in  a  Trust  may be
obligations of issuers  whose revenues are  primarily derived from  the sale  of
electric  energy. The problems  faced by such issuers  include the difficulty in
obtaining approval for timely  and adequate rate  increases from the  applicable
public  utility  commissions,  the difficulty  of  financing  large construction
programs, increased competition, reductions in estimates of
 
                                      A-3
<PAGE>
future demand for electricity in certain  areas of the country, the  limitations
on  operations  and increased  costs  and delays  attributable  to environmental
considerations, the difficulty of the capital market in absorbing utility  debt,
the  difficulty in obtaining fuel at reasonable  prices and the effect of energy
conservation. All  of  such issuers  have  been experiencing  certain  of  these
problems   in  varying  degrees.  In  addition,  Federal,  state  and  municipal
governmental authorities  may from  time  to time  review existing,  and  impose
additional,  regulations governing the licensing,  construction and operation of
nuclear power plants, which may adversely  affect the ability of the issuers  of
certain of the Bonds in a Trust to make payments of principal and/or interest on
such Bonds.
 
    TRANSPORTATION  FACILITY REVENUE BONDS.  Some of the Bonds in a Trust may be
obligations of issuers which  are payable from and  secured by revenues  derived
from  the ownership and operation of airports, public transit systems and ports.
The major portion of  an airport's gross operating  income is generally  derived
from  fees received  from airlines pursuant  to use agreements  which consist of
annual payments for airport  use, occupancy of  certain terminal space,  service
fees  and  leases. Airport  operating income  may therefore  be affected  by the
ability of the airlines to meet their obligations under the use agreements.  The
air  transport industry is  experiencing significant variations  in earnings and
traffic,  due  to  increased  competition,  excess  capacity,  increased  costs,
deregulation,  traffic constraints and  other factors, and  several airlines are
experiencing severe financial difficulties.  In particular, facilities with  use
agreements involving airlines experiencing financial difficulty may experience a
reduction  in revenue due  to the possible  inability of these  airlines to meet
their use  agreement  obligations because  of  such financial  difficulties  and
possible  bankruptcy.  The Sponsor  cannot  predict what  effect  these industry
conditions may have on airport revenues  which are dependent for payment on  the
financial  condition of the  airlines and their usage  of the particular airport
facility. Bonds that are secured primarily by the revenue collected by a  public
transit  system  typically are  additionally secured  by a  pledge of  sales tax
receipts collected  at  the state  or  local  level, or  of  other  governmental
financial assistance. Transit system net revenues will be affected by variations
in  utilization,  which  in  turn  may  be  affected  by  the  degree  of  local
governmental subsidization, demographic and  population shifts, and  competition
from  other forms  of transportation;  and by  increased costs,  including costs
resulting from previous deferrals of maintenance. Port authorities derive  their
revenues  primarily from fees imposed on ships using the facilities. The rate of
utilization of such facilities may fluctuate depending on the local economy  and
on  competition from  competing forms  of transportation  such as  air, rail and
trucks.
 
    WATER AND/OR SEWERAGE  OBLIGATIONS.  Some  of the  Bonds in a  Trust may  be
obligations  of issuers whose revenues are derived from the sale of water and/or
sewerage services. Such Bonds are generally payable from user fees. The problems
of such  issuers  include  the  ability  to  obtain  timely  and  adequate  rate
increases,  population decline resulting in  decreased user fees, the difficulty
of financing  large construction  programs, the  limitations on  operations  and
increased  costs and  delays attributable  to environmental  considerations, the
increasing difficulty of obtaining or  discovering new supplies of fresh  water,
the  effect  of  conservation  programs and  the  impact  of  "no-growth" zoning
ordinances. All of such issuers have been experiencing certain of these problems
in varying degrees.
 
    UNIVERSITY AND COLLEGE REVENUE  OBLIGATIONS.  Some of  the Bonds in a  Trust
may  be obligations  of issuers  which are,  or which  govern the  operation of,
colleges and universities and  whose revenues are  derived mainly from  tuition,
dormitory revenues, grants and
 
                                      A-4
<PAGE>
endowments. General problems of such issuers include the prospect of a declining
percentage  of the population consisting  of "college" age individuals, possible
inability to raise tuitions and  fees sufficiently to cover increased  operating
costs, the uncertainty of continued receipt of Federal grants and state funding,
and  government  legislation  or  regulations  which  may  adversely  affect the
revenues or costs of  such issuers. All of  such issuers have been  experiencing
certain of these problems in varying degrees.
 
    BRIDGE AUTHORITY AND TOLLROAD OBLIGATIONS.  Some of the Bonds in a Trust may
be  obligations  of issuers  which derive  their payments  from bridge,  road or
tunnel toll revenues. The revenues of such an issuer could be adversely affected
by competition from toll-free vehicular bridges and roads and alternative  modes
of transportation. Such revenues could also be adversely affected by a reduction
in  the availability of fuel to motorists  or significant increases in the costs
thereof. Specifically, governmental regulations restricting the use of  vehicles
in  the New  York City  metropolitan area may  adversely affect  revenues of the
Triborough Bridge and Tunnel Authority.
 
    DEDICATED-TAX SUPPORTED  BONDS.    Some of  the  Bonds  in a  Trust  may  be
obligations of issuers which are payable from and secured by tax revenues from a
designated  source, which revenues are pledged  to secure the bonds. The various
types of  Bonds described  below differ  in structure  and with  respect to  the
rights of the bondholders to the underlying property. Each type of dedicated-tax
supported  Bond has distinct risks, only some  of which are set forth below. One
type of dedicated-tax supported Bond is secured by the incremental tax  received
on  either real property or on  sales within a specifically defined geographical
area; such  tax  generally will  not  provide bondholders  with  a lien  on  the
underlying property or revenues. Another type of dedicated-tax supported Bond is
secured  by a special tax levied on  real property within a defined geographical
area in such  a manner  that the tax  is levied  on those who  benefit from  the
project;  such bonds  typically provide for  a statutory lien  on the underlying
property for unpaid taxes. A third  type of dedicated-tax supported Bond may  be
secured by a tax levied upon the manufacture, sale or consumption of commodities
or  upon the license to pursue  certain occupations or upon corporate privileges
within a taxing jurisdiction. As to any of these types of Bonds, the ability  of
the  designated revenues to satisfy the  interest and principal payments on such
bonds may be affected by changes in the local economy, the financial success  of
the  enterprise  responsible for  the payment  of  the taxes,  the value  of any
property on which taxes may be assessed and the ability to collect such taxes in
a timely fashion. Each  of these factors  will have a  different affect on  each
distinct type of dedicated-tax supported bonds.
 
    MUNICIPAL LEASE BONDS.  Some of the Bonds in a Trust may be obligations that
are  secured  by lease  payments  of a  governmental  entity. Such  payments are
normally subject to  annual budget  appropriations of  the leasing  governmental
entity.  A governmental  entity that enters  into such a  lease agreement cannot
obligate future  governments to  appropriate  for and  make lease  payments  but
covenants  to take such action as is necessary to include any lease payments due
in its budgets and to make the appropriations therefor. A governmental  entity's
failure to appropriate for and to make payments under its lease obligation could
result  in insufficient funds  available for payment  of the obligations secured
thereby.
 
    ORIGINAL ISSUE  DISCOUNT BONDS  AND STRIPPED  OBLIGATIONS.   Certain of  the
Bonds  in a Trust may be original  issue discount bonds. These Bonds were issued
with nominal  interest rates  less than  the rates  then offered  by  comparable
securities and as a consequence were
 
                                      A-5
<PAGE>
originally  sold at a  discount from their  face, or par,  values. This original
issue discount,  the difference  between  the initial  purchase price  and  face
value,  is deemed under current  law to accrue on a  daily basis and the accrued
portion is  treated  as  tax-exempt  interest  income  for  federal  income  tax
purposes.  On sale or redemption, gain, if any, realized in excess of the earned
portion of original issue discount will be taxable as capital gain. See "What is
the Tax Status of Unitholders". The current value of an original issue  discount
bond  reflects the  present value of  its face  amount at maturity.  In a stable
interest rate environment, the market value  of an original issue discount  bond
would  tend to increase more slowly in  early years and in greater increments as
the bond approached maturity.
 
    Certain of the original issue discount bonds  in a Trust may be zero  coupon
bonds. Zero coupon bonds do not provide for the payment of any current interest;
the  buyer receives only the right to receive a final payment of the face amount
of the bond at its maturity. The effect  of owning a zero coupon bond is that  a
fixed  yield is earned not only on  the original investment but also, in effect,
on all  discount  earned  during  the life  of  the  obligation.  This  implicit
reinvestment of earnings at the same rate eliminates the risk of being unable to
reinvest  the income on such obligation at a rate as high as the implicit yield,
but at the same time also eliminates the holder's ability to reinvest at  higher
rates  in  the  future.  For  this reason,  zero  coupon  bonds  are  subject to
substantially greater  price  fluctuations  during periods  of  changing  market
interest  rates  than are  securities of  comparable  quality that  pay interest
currently.
 
    Original issue discount bonds, including  zero coupon bonds, may be  subject
to  redemption at prices  based on the  issue price plus  the amount of original
issue  discount  accreted  to  redemption   (the  "accreted  value")  plus,   if
applicable,  some premium.  Pursuant to such  call provisions  an original issue
discount bond may be called prior to its maturity date at a price less than  its
face  value. See the  "Schedules of Investments" for  more information about the
call provisions of portfolio Bonds.
 
    Certain of the Bonds in a Trust may be Stripped Obligations, which represent
evidences of  ownership with  respect to  either the  principal amount  of or  a
payment  of interest on a tax-exempt  obligation. An obligation is "stripped" by
depositing it with  a custodian, which  then effects a  separation in  ownership
between  the bond and any interest payment which has not yet become payable, and
issues evidences of ownership with respect to such constituent parts. A Stripped
Obligation therefore has economic characteristics similar to zero coupon  bonds,
as described above.
 
    Each  Stripped Obligation has  been purchased at a  discount from the amount
payable at maturity. With respect to each Unitholder, the Internal Revenue  Code
treats  as "original issue discount" that portion of the discount which produces
a yield to maturity (as of the date of purchase of the Unitholder's Units) equal
to the lower of the coupon rate of interest on the underlying obligation or  the
yield  to maturity on the basis of  the purchase price of the Unitholder's Units
which is allocable to  each Stripped Obligation.  Original issue discount  which
accrues with respect to a Stripped Obligation will be exempt from Federal income
taxation  to the  same extent  as interest  on the  underlying obligations. (See
Section 11, " What Is The Tax Status of Unitholders".)
 
    Unitholders should consult their own tax advisers with respect to the  state
and  local tax consequences of owning  original issue discount bonds or Stripped
Obligations. Under applicable  provisions governing determination  of state  and
local taxes, interest on original
 
                                      A-6
<PAGE>
issue discount bonds or Stripped Obligations may be deemed to be received in the
year of accrual even though there is no corresponding cash payment.
 
4.  COMPOSITION OF TRUSTS
 
Each  Trust initially consists  of delivery statements  relating to contracts to
purchase Bonds (or of such Bonds) as are listed under "Schedules of Investments"
and, thereafter, of  such Bonds as  may continue to  be held from  time to  time
(including  certain securities deposited in the  Trust in substitution for Bonds
not delivered to the Trust or in exchange or substitution for Bonds upon certain
refundings), together  with  accrued  and  undistributed  interest  thereon  and
undistributed cash realized from the disposition of Bonds.
 
    "WHEN-ISSUED"  AND  "DELAYED  DELIVERY"  TRANSACTIONS.    The  contracts  to
purchase Bonds delivered to  the Trustee represent an  obligation by issuers  or
dealers  to deliver Bonds  to the Sponsor  for deposit in  the Trusts. Normally,
"regular way"  contracts are  settled and  the Bonds  delivered to  the  Trustee
within  a relatively  short period  of time.  However, certain  of the contracts
relate to Bonds which have not been issued  as of the Date of Deposit and  which
are  commonly referred to  as "when issued"  or "when, as  and if issued" Bonds.
Although the Sponsor does not believe it  is likely, one or more of the  issuers
of such Bonds might decide not to proceed with such offerings. If such Bonds, or
replacement  bonds described  below, are  not acquired  by a  Trust or  if their
delivery is  delayed, the  Estimated  Current Returns  and Estimated  Long  Term
Returns  shown herein may be reduced. Certain  of the contracts for the purchase
of Bonds provide for delivery dates  after the date of settlement for  purchases
made  on  the Date  of  Deposit. Interest  on  such "when  issued"  and "delayed
delivery" Bonds accrues to the benefit of Unitholders commencing with the  first
settlement  date for the Units. However,  in the opinion of counsel, Unitholders
who purchase their Units prior to the date such Bonds are actually delivered  to
the  Trustee must reduce the  tax basis of their  Units for interest accruing on
such Bonds during the interval between their purchase of Units and the  delivery
of  the Bonds because such amounts constitute a return of principal. As a result
of such adjustment, the  Estimated Current Returns set  forth herein (which  are
based  on the Public Offering Price as of  the business day prior to the Date of
Deposit) may be  slightly lower than  Unitholders will receive  after the  first
year,  assuming the Portfolio does not  change and estimated annual expense does
not vary from that set forth under "Essential Information Regarding the Trusts."
Those Bonds  in each  Trust purchased  with  delivery dates  after the  date  of
settlement  for  purchases made  on  the Date  of Deposit  are  so noted  in the
Schedules of Investments.
 
    LIMITED REPLACEMENT OF CERTAIN BONDS.   Neither the Sponsor nor the  Trustee
shall  be liable in any way  for any default, failure or  defect in any Bond. In
the event of a failure to deliver any  Bond that has been purchased for a  Trust
under  a contract, including those  Bonds purchased on a  when, as and if issued
basis ("Failed Bonds"), the Sponsor is authorized under the Indenture to  direct
the  Trustee to acquire  other specified Bonds ("Replacement  Bonds") to make up
the original corpus of the Trust. The Replacement Bonds must be purchased within
20 days after  delivery of notice  of the failed  contract and the  cost to  the
Trust  (exclusive  of  accrued interest)  may  not  exceed the  amount  of funds
reserved for the purchase  of the Failed Bonds.  The Replacement Bonds (i)  must
satisfy  the criteria previously described for  Bonds originally included in the
Trust and, with respect  to Bonds purchased  for a State  Trust, shall have  the
benefit of an exemption from state taxation of interest to an extent equal to or
greater  than that of  the Bonds they  replace, (ii) must  have a fixed maturity
date after the date of purchase of  not less than approximately 15 years in  the
case  of National or State Trusts, approximately 11  years in the case of a Long
Intermediate Trust, approximately 5 years in  the case of Intermediate or  State
Intermediate  Trusts, approximately 3 years in  the case of a Short Intermediate
Trust and
 
                                      A-7
<PAGE>
approximately 1 year in the case of a  Short Term Trust, but not later than  the
maturity date of the Failed Bonds, (iii) must be acquired at a cost to the Trust
equal  to the cost of the same principal  amount of Bonds provided in the failed
contract and have  a current  return and  yield to  maturity not  less than  the
current  return and yield to maturity of the  Failed Bonds and (iv) shall not be
"when, as and if  issued" Bonds. Whenever a  Replacement Bond has been  acquired
for  a Trust, the  Trustee shall, within  five days after  the delivery thereof,
mail or deliver a  notice of such  acquisition to all  Unitholders of the  Trust
involved.  Once the original corpus  of the Trust is  acquired, the Trustee will
have no power to vary the investment of the Trust; i.e., the Trust will have  no
managerial power to take advantage of market variation to improve a Unitholder's
investment.
 
    To  the extent the right of  limited substitution described in the preceding
paragraph shall not  be utilized  to acquire  Replacement Bonds  for the  entire
principal amount of Failed Bonds, the Sponsor shall refund to all Unitholders of
the  Trust  involved the  sales  charge attributable  to  such Failed  Bonds not
replaced, and  the principal  and accrued  interest attributable  to such  Bonds
shall  be distributed  not more  than 30  days after  the determination  of such
failure or at such earlier time as  the Trustee in its sole discretion deems  to
be  in  the interest  of  the Unitholders.  Any  such accrued  interest  paid to
Unitholders will be paid by the Sponsor and, accordingly, will not be treated as
tax-exempt income. In the event Failed Bonds  in a Trust could not be  replaced,
the  Net Annual Interest Income per Unit for such Trust would be reduced and the
Estimated Current Return thereon might be lowered.
 
    SALE, MATURITY AND REDEMPTION OF BONDS.  Certain of the Bonds may from  time
to  time  under certain  circumstances be  sold  or redeemed  or will  mature in
accordance with their terms. The proceeds from  such events will be used to  pay
for   Units  redeemed  or   distributed  to  Unitholders   and  not  reinvested;
accordingly, no assurance can be given that  a Trust will retain for any  length
of time its present size and composition.
 
    All  of the Bonds in  each Trust are subject to  being called or redeemed in
whole or  in part  prior to  their stated  maturities pursuant  to the  optional
redemption  provisions described in  the "Schedules of  Investments" and in most
cases pursuant to sinking fund, special or extraordinary redemption  provisions.
A  bond  subject to  optional  call is  one which  is  subject to  redemption or
refunding prior to maturity at the option of the issuer. A refunding is a method
by which a bond issue is redeemed, at  or before maturity, by the proceeds of  a
new  bond  issue. A  bond subject  to sinking  fund redemption  is one  which is
subject to  partial call  from time  to time  from a  fund accumulated  for  the
scheduled  retirement of  a portion  of an issue  prior to  maturity. Special or
extraordinary redemption  provisions may  provide  for redemption  of all  or  a
portion  of an  issue upon  the occurrence  of certain  circumstances related to
defaults or unanticipated changes  in circumstances. Events  that may permit  or
require  the special or extraordinary redemption of bonds include, among others:
substantial damage to or  destruction of the project  for which the proceeds  of
the  bonds were used; exercise by a local, state or federal governmental unit of
its power of eminent domain to take all or substantially all of the project  for
which  the  proceeds of  the bonds  were  used; a  final determination  that the
interest on the bonds  is taxable; changes in  the economic availability of  raw
materials,  operating supplies or  facilities or technological  or other changes
which render the operation of  the project for which  the proceeds of the  bonds
were  used uneconomical; changes in law  or an administrative or judicial decree
which render the performance  of the agreement under  which the proceeds of  the
bonds  were made  available to  finance the  project impossible  or which create
unreasonable burdens or which impose  excessive liabilities, such as taxes,  not
imposed  on the date the bonds are issued on the issuer of the bonds or the user
of the  proceeds  of the  bonds;  an  administrative or  judicial  decree  which
requires  the cessation of a  substantial part of the  operations of the project
financed with the proceeds of the bonds;
 
                                      A-8
<PAGE>
an overestimate of the costs of the project to be financed with the proceeds  of
the  bonds resulting in excess proceeds which may be applied to redeem bonds; or
an underestimate of  a source of  funds securing the  bonds resulting in  excess
funds which may be applied to redeem bonds. The Sponsor is unable to predict all
of  the circumstances which may result in  such redemption of an issue of Bonds.
See the discussion of the various  types of bond issues, above, for  information
on  the  call  provisions of  such  bonds, particularly  single  family mortgage
revenue bonds.
 
    The exercise of redemption or call provisions will (except to the extent the
proceeds of the called Bonds are used to pay for Unit redemptions) result in the
distribution of  principal  and may  result  in a  reduction  in the  amount  of
subsequent  interest distributions;  it may  also affect  the current  return on
Units of the Trust involved. Redemption pursuant to optional call provisions  is
more  likely to  occur, and  redemption pursuant to  sinking fund  or special or
extraordinary redemption provisions may occur,  when the Bonds have an  offering
side  evaluation which  represents a  premium over  par. Redemption  pursuant to
optional call provisions  may be,  and redemption  pursuant to  sinking fund  or
special or extraordinary redemption provisions is likely to be, at a price equal
to the par value of the bonds without any premium (in the case of original issue
discount  bonds, such redemption is generally to be made at the issue price plus
the amount of original issue discount  accreted to the date of redemption;  such
price  is referred to herein  as "accreted value"). Because  Bonds may have been
valued at prices above or below par value or the then current accreted value  at
the  time Units were  purchased, Unitholders may  realize gain or  loss upon the
redemption of portfolio  Bonds. (See Sections  11 and 13  and the "Schedules  of
Investments.")
 
    CERTAIN  TAX  MATTERS;  LITIGATION.   Certain  of  the Bonds  in  each Trust
portfolio may be subject  to continuing requirements such  as the actual use  of
bond proceeds, manner of operation of the project financed from bond proceeds or
rebate  of excess  earnings on  bond proceeds that  may affect  the exemption of
interest on such  Bonds from Federal  income taxation. Although  at the time  of
issuance  of each  of the  Bonds in each  Trust an  opinion of  bond counsel was
rendered as to the exemption of interest on such obligations from Federal income
taxation, and the issuers covenanted  to comply with all requirements  necessary
to retain the tax-exempt status of the Bonds, there can be no assurance that the
respective  issuers  or  other obligors  on  such obligations  will  fulfill the
various continuing  requirements  established  upon issuance  of  the  Bonds.  A
failure to comply with such requirements may cause a determination that interest
on  such  obligations  is  subject  to  Federal  income  taxation,  perhaps even
retroactively from the  date of  issuance of  such Bonds,  thereby reducing  the
value of the Bonds and subjecting Unitholders to unanticipated tax liabilities.
 
    To  the best knowledge of the Sponsor,  there is no litigation pending as of
the Date of Deposit in respect of  any Bonds which might reasonably be  expected
to  have a  material adverse effect  on any of  the Trusts. It  is possible that
after the Date of Deposit, litigation may be initiated with respect to Bonds  in
any  Trust. Any  such litigation may  affect the  validity of such  Bonds or the
tax-exempt nature of the interest thereon,  but while the outcome of  litigation
of  such nature can never be entirely predicted, the opinions of bond counsel to
the issuer of  each Bond  on the  date of issuance  state that  such Bonds  were
validly issued and that the interest thereon is, to the extent indicated, exempt
from Federal income tax.
 
                                      A-9
<PAGE>
5.  WHY AND HOW ARE THE BONDS INSURED?
 
INSURANCE ON BONDS IN INSURED TRUSTS
 
Insurance  guaranteeing  the  timely payment,  when  due, of  all  principal and
interest on the Bonds in each Insured Trust has been obtained by the Sponsor  or
by  the  issuers or  underwriters  of Bonds  from  the Municipal  Bond Investors
Assurance Corporation (the "Insurer"). Some of  the Bonds in each Insured  Trust
may  be covered by a policy or policies  of insurance obtained by the issuers or
underwriters of  the  Bonds  from  Municipal  Bond  Insurance  Association  (the
"Association") or Bond Investors Guaranty Insurance Company ("BIG"). The Insurer
has  issued a policy or policies of insurance  covering each of the Bonds in the
Insured Trusts, each policy to remain in force until the payment in full of such
Bonds and whether or not the Bonds continue  to be held by an Insured Trust.  By
the  terms  of each  policy the  Insurer will  unconditionally guarantee  to the
holders or owners of the Bonds the payment, when due, required of the issuer  of
the  Bonds of an amount equal  to the principal of and  interest on the Bonds as
such payments shall become due but not be paid (except that in the event of  any
acceleration  of the due  date of principal  by reason of  mandatory or optional
redemption, default or otherwise, the payments  guaranteed will be made in  such
amounts  and  at  such times  as  would have  been  due  had there  not  been an
acceleration). The  Insurer will  be  responsible for  such payments,  less  any
amounts  received by the holders or owners of the Bonds from any trustee for the
bond issuers or  from any other  sources other than  the Insurer. The  Insurer's
policies  relating to small  industrial development bonds  and pollution control
revenue bonds also guarantee the full and complete payments required to be  made
by  or on behalf  of an issuer  of Bonds pursuant  to the terms  of the Bonds if
there occurs an event which results in the loss of the tax-exempt status of  the
interest  on such Bonds,  including principal, interest  or premium payments, if
any, as and when thereby required. The Insurer has indicated that its  insurance
policies  do not insure the payment of  principal or interest on bonds which are
not required to be paid by the issuer thereof because the bonds were not validly
issued; as  indicated  under  "What  is the  Tax  Status  of  Unitholders?"  the
respective  issuing authorities have received  opinions of bond counsel relating
to the valid issuance of each of the Bonds in the Insured Trusts. The  Insurer's
policy  also does not insure against non-payment  of principal of or interest on
the Bonds resulting from the insolvency, negligence or any other act or omission
of the trustee or other paying agent for the Bonds. The policy is not covered by
the Property/ Casualty Insurance  Security Fund specified in  Article 76 of  the
New  York  Insurance Law.  The policies  are  non-cancellable and  the insurance
premiums have been fully paid on or prior to the Date of Deposit, either by  the
Sponsor or, if a policy has been obtained by a Bond issuer, by such issuer.
 
    Upon  notification from  the trustee  for any bond  issuer or  any holder or
owner of the Bonds or coupons that such trustee or paying agent has insufficient
funds to pay any  principal or interest  in full when due,  the Insurer will  be
obligated  to deposit funds  promptly with State Street  Bank and Trust Company,
N.A., New York, New York, as fiscal  agent for the Insurer, sufficient to  fully
cover the deficit. If notice of nonpayment is received on or after the due date,
the  Insurer will provide for payment  within one business day following receipt
of the notice. Upon payment  by the Insurer of  any Bonds, coupons, or  interest
payments,  the Insurer shall succeed  to the rights of  the owner of such Bonds,
coupons or interest payments with respect thereto.
 
    The Insurer is the principal operating subsidiary of MBIA, Inc., a New  York
Stock  Exchange listed company. MBIA, Inc. is  not obligated to pay the debts of
or claims against the  Insurer. The Insurer is  a limited liability  corporation
rather  than a  several liability association.  The Insurer is  domiciled in the
State of New York and licensed to do business in all 50 states, the District  of
Columbia and the Commonwealth of Puerto Rico.
 
                                      A-10
<PAGE>
   
    As  of December  31, 1993  the Insurer had  admitted assets  of $3.1 billion
(audited), total liabilities of  $2.1 billion (audited),  and total capital  and
surplus  of  $978  million  (audited) determined  in  accordance  with statutory
accounting  practices   prescribed   or  permitted   by   insurance   regulatory
authorities.  As of September 30, 1994, the  Insurer had admitted assets of $3.3
billion (unaudited), total  liabilities of $2.2  billion (unaudited), and  total
capital  and surplus of  $1.1 billion (unaudited)  determined in accordance with
statutory accounting practices prescribed  or permitted by insurance  regulatory
authorities.  Copies of the Insurer's year  end financial statements prepared in
accordance with statutory accounting practices  are available from the  Insurer.
The address of the Insurer is 113 King Street, Armonk, New York 10504.
    
 
    Each  insurance company comprising the Association will be severally and not
jointly obligated  under  the Association  policy  in the  following  respective
percentages:  The  AEtna  Casualty  and  Surety  Company,  33%;  Fireman's  Fund
Insurance Company, 30%;  The Travelers Indemnity  Company, 15%; AEtna  Insurance
Company  (now  known  as CIGNA  Property  and  Casualty Company),  12%;  and The
Continental Insurance Company, 10%.  As a several  obligor, each such  insurance
company  will be  obligated only to  the extent  of its percentage  of any claim
under the  Association  policy and  will  not be  obligated  to pay  any  unpaid
obligation  of any  other member  of the  Association. Each  insurance company's
participation is backed by all of its assets. However, each insurance company is
a multiline insurer involved in several lines of insurance other than  municipal
bond  insurance, and the assets of each insurance company also secure all of its
other insurance policy and surety bond obligations.
 
    The following table sets forth certain unaudited financial information  with
respect  to  the  five  insurance  companies  comprising  the  Association.  The
statistics, which have been furnished by the Association, are as reported by the
insurance  companies  to  the  New  York  State  Insurance  Department  and  are
determined in accordance with statutory accounting principles. No representation
is  made herein as to the accuracy or  adequacy of such information or as to the
absence of material adverse changes in  such information subsequent to the  date
thereof.  In addition,  these numbers  are subject to  revision by  the New York
State Insurance Department which, if revised, could either increase or  decrease
the amounts.
 
                      MUNICIPAL BOND INSURANCE ASSOCIATION
      FIVE MEMBER COMPANIES ASSETS AND POLICYHOLDERS' SURPLUS (UNAUDITED)
                              AS OF JUNE 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......................  $    10,169,558  $     8,299,548   $  1,870,010
Fireman's Fund Insurance Company.........................        6,751,350        4,893,824      1,857,526
The Travelers Indemnity Company..........................       10,246,669        8,486,034      1,760,635
CIGNA Property and Casualty Company (formerly AEtna
  Insurance Company).....................................        4,992,242        4,924,356         67,886
The Continental Insurance Company........................        2,712,535        2,351,467        361,068
                                                           ---------------  ---------------  --------------
        Total............................................  $    34,872,354  $    28,955,229   $  5,917,125
                                                           ---------------  ---------------  --------------
                                                           ---------------  ---------------  --------------
</TABLE>
 
    Standard   &  Poor's  Corporation  rates  all  new  issues  insured  by  the
Association "AAA" Prime Grade.
 
    Moody's Investors Service rates all  bond issues insured by the  Association
"Aaa"  and  short term  loans  "MIG 1",  both designated  to  be of  the highest
quality.
 
                                      A-11
<PAGE>
    Each such rating should be evaluated  independently of any other rating.  No
application  has  been  made to  any  other  rating agency  in  order  to obtain
additional ratings  on the  Bonds.  The ratings  reflect the  respective  rating
agency's  current assessment of the creditworthiness  of the Association and its
ability to pay claims on its  policies of insurance. Any further explanation  as
to  the  significance  of  the  above ratings  may  be  obtained  only  from the
applicable rating agency.
 
    Moody's Investors Service rates all bond issues insured by the Insurer "Aaa"
and short-term loans "MIG 1," both designated to be of the highest quality.
 
    Standard & Poor's  Ratings Group,  a division  of McGraw  Hill ("Standard  &
Poor's") rates all new issues insured by the Insurer "AAA" Prime Grade."
 
    The  Moody's Investors  Service rating  of the  Insurer should  be evaluated
independently of the  Standard & Poor's  Corporation rating of  the Insurer.  No
application  has  been  made to  any  other  rating agency  in  order  to obtain
additional ratings  on the  Bonds.  The ratings  reflect the  respective  rating
agency's  current  assessment of  the creditworthiness  of  the Insurer  and its
ability to  pay  claims  on  its policies  of  insurance  (See  "Description  of
Ratings.")  Any further explanation as to  the significance of the above ratings
may be obtained only from the applicable rating agency.
 
    The above ratings are  not recommendations to buy,  sell or hold the  Bonds,
and  such ratings may  be subject to revision  or withdrawal at  any time by the
rating agencies. Any downward revision or  withdrawal of either or both  ratings
may have an adverse effect on the market price of the Bonds.
 
    Because  the insurance on the  Bonds will be effective  so long as the Bonds
are outstanding, such insurance  will be taken into  account in determining  the
market  value  of  the  Bonds  and therefore  some  value  attributable  to such
insurance will be included in the value of the Units of the Insured Trusts.  The
insurance  does not, however, guarantee the market  value of the Bonds or of the
Units.
 
INSURANCE ON CERTAIN BONDS IN TRADITIONAL TRUSTS
 
    Insurance guaranteeing the timely  payment, when due,  of all principal  and
interest  on certain Bonds in a Traditional  Trust may have been obtained by the
Sponsor, issuer or underwriter  of the particular Bonds  involved or by  another
party.  Such insurance, which  provides coverage substantially  the same as that
obtained with  respect  to  Bonds  in Insured  Trusts  as  described  above,  is
effective  so long as the insured Bond is outstanding and the insurer remains in
business. Insurance relates  only to the  particular Bond and  not to the  Units
offered hereby or to their market value. Insured Bonds have received a rating of
"Aaa"  by  Moody's Investors  Service, Inc.  and/or "AAA"  by Standard  & Poor's
Corporation in recognition of such insurance.
 
    If a Bond  in a Traditional  Trust is insured,  the Schedule of  Investments
will identify the insurer. Such insurance will be provided by Financial Guaranty
Insurance   Company  ("FGIC"),  AMBAC   Indemnity  Corporation  ("AMBAC"),  Bond
Investors Guaranty  Insurance  Company, now  known  as MBIA  Corp.  of  Illinois
("BIG"),   Capital  Guaranty  Insurance  Company  ("CGIC"),  Financial  Security
Assurance,   Inc.   ("FSA"),   Municipal   Bond   Insurance   Association   (the
"Association"),  Municipal  Bond  Investors  Assurance  Corporation  ("MBIA") or
Connie Lee Insurance Company  ("ConnieLee"). The Sponsor  to date has  purchased
and  presently intends  to purchase  insurance for  Bonds in  Traditional Trusts
exclusively from MBIA (see the  preceding disclosure regarding MBIA). There  can
be  no assurance  that any insurer  listed therein  will be able  to satisfy its
commitments in the
 
                                      A-12
<PAGE>
event claims are made in the future. However, Standard & Poor's Corporation  has
rated  the claims-paying  ability of each  insurer "AAA,"  and Moody's Investors
Service has rated  all bonds  insured by  each such  insurer, except  ConnieLee,
"Aaa."  Moody's  Investor's  Service  gives  no  ratings  for  bonds  insured by
ConnieLee.
 
    Because any such insurance  will be effective so  long as the insured  Bonds
are  outstanding, such insurance  will be taken into  account in determining the
market value  of  such Bonds  and  therefore  some value  attributable  to  such
insurance  will be included in the value of the Units of the Trust that includes
such Bonds. The insurance does not,  however, guarantee the market value of  the
Bonds or of the Units.
 
6.  HOW IS THE PUBLIC OFFERING PRICE DETERMINED?
 
The  Public Offering Price of the Units of  each Trust is equal to the Trustee's
determination of the aggregate  OFFERING prices of  the Bonds deposited  therein
(minus  any  advancement to  the  principal account  of  the Trust  made  by the
Trustee) plus a sales charge of 5.152%  of the aggregate offering prices in  the
case  of National and State  Trusts, 4.439% of the  aggregate offering prices in
the case of Long Intermediate Trusts, 4.058% of the aggregate offering prices in
the case of Intermediate Trusts, 3.093% of the aggregate offering prices in  the
case of Short Intermediate Trusts and 2.564% of the aggregate offering prices in
the  case of Short  Term Trusts, in each  case adding to  the total thereof cash
held by the Trust,  if any, and dividing  the sum so obtained  by the number  of
Units  outstanding in the Trust. This  computation produces a gross underwriting
profit equal to 4.90% of the Public  Offering Price in the case of National  and
State  Trusts,  4.25%  of  the  Public  Offering  Price  in  the  case  of  Long
Intermediate Trusts,  3.90%  of  the  Public  Offering  Price  in  the  case  of
Intermediate  Trusts, 3.00% of  the Public Offering  Price in the  case of Short
Intermediate Trusts and 2.50% of the Public Offering Price in the case of  Short
Term Trusts.
 
    The  sales charge applicable to quantity purchases is reduced on a graduated
scale for sales to any  purchaser of at least $50,000  or 500 Units and will  be
applied  on whichever basis is more favorable  to the purchaser. For purposes of
calculating the applicable  sales charge,  purchasers who  have indicated  their
intent  to purchase a specified amount of Units of any Trust described herein in
the primary offering period  or units of any  other series of Nuveen  Tax-Exempt
Unit  Trusts in the primary 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 table
based on the amount of intended  aggregate purchases as expressed in the  letter
of  intent. By  establishing a  letter of intent,  a Unitholder  agrees that the
first purchase of Units following the execution of such letter of intent will be
at least 5% of the total amount of the intended aggregate purchases expressed in
such Unitholder's letter of  intent. Further, through  the establishment of  the
letter of intent, such Unitholder agrees that units representing 5% of the total
amount  of the intended purchases will be  held in escrow by United States Trust
Company of New York pending completion of these purchases. All distributions  on
units  held in escrow  will be credited  to such Unitholder's  account. If total
purchases prior to the expiration of the letter of intent period equal or exceed
the amount  specified in  a Unitholder's  letter of  intent, the  units held  in
escrow  will be transferred to such Unitholder's account. If the total purchases
are less than the amount specified, the Unitholder involved must pay the Sponsor
an amount equal to the difference  between the amounts paid for these  purchases
and  the amounts which would have been paid  if the higher sales charge had been
applied. If such Unitholder  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
 
                                      A-13
<PAGE>
give instructions to redeem any or all of such Unitholder's escrowed units, with
full  power  of substitution  in the  premises. A  Unitholder or  his securities
representative must notify the Sponsor whenever such Unitholder makes a purchase
of Units that he wishes to be counted towards the intended amount. Sales charges
during the primary offering period are as follows:
 
<TABLE>
<CAPTION>
                                                         NATIONAL AND STATE      LONG INTERMEDIATE
                                                               TRUSTS                  TRUSTS           INTERMEDIATE TRUSTS
                                                       ----------------------  ----------------------  ----------------------
<S>                                                    <C>          <C>        <C>          <C>        <C>          <C>
                                                         PERCENT     PERCENT     PERCENT     PERCENT     PERCENT     PERCENT
                                                           OF        OF NET        OF        OF NET        OF        OF NET
                                                        OFFERING     AMOUNT     OFFERING     AMOUNT     OFFERING     AMOUNT
                  NUMBER OF UNITS*                        PRICE     INVESTED      PRICE     INVESTED      PRICE     INVESTED
- -----------------------------------------------------  -----------  ---------  -----------  ---------  -----------  ---------
Less than 500........................................        4.90%      5.152%       4.25%      4.439%       3.90%      4.058%
500 but less than 1,000..............................        4.75       4.987        4.15       4.330        3.70       3.842
1,000 but less than 2,500............................        4.50       4.712        3.85       4.004        3.50       3.627
2,500 but less than 5,000............................        4.25       4.439        3.60       3.734        3.25       3.359
5,000 but less than 10,000...........................        3.50       3.627        3.35       3.466        3.00       3.093
10,000 but less than 25,000..........................        3.00       3.093        3.00       3.093        2.75       2.828
25,000 but less than 50,000..........................        2.50       2.564        2.50       2.564        2.50       2.564
50,000 or more.......................................        2.00       2.041        2.00       2.041        2.00       2.041
</TABLE>
 
<TABLE>
<CAPTION>
                                                         SHORT INTERMEDIATE
                                                               TRUSTS            SHORT TERM TRUSTS
                                                       ----------------------  ----------------------
<S>                                                    <C>          <C>        <C>          <C>        <C>          <C>
                                                         PERCENT     PERCENT     PERCENT     PERCENT
                                                           OF        OF NET        OF        OF NET
                                                        OFFERING     AMOUNT     OFFERING     AMOUNT
                  NUMBER OF UNITS*                        PRICE     INVESTED      PRICE     INVESTED
- -----------------------------------------------------  -----------  ---------  -----------  ---------
Less than 500........................................        3.00%      3.093%       2.50%      2.564%
500 but less than 1,000..............................        2.80       2.881        2.30       2.354
1,000 but less than 2,500............................        2.60       2.670        2.10       2.145
2,500 but less than 5,000............................        2.35       2.407        1.85       1.885
5,000 but less than 10,000...........................        2.10       2.145        1.60       1.626
10,000 but less than 25,000..........................        1.85       1.885        1.35       1.368
25,000 but less than 50,000..........................        1.80       1.833        1.25       1.266
50,000 or more.......................................        1.50       1.523        1.15       1.163
</TABLE>
 
*Breakpoint sales charges are computed both on  a dollar basis and on the  basis
 of the number of Units purchased, using the equivalent of 500 Units to $50,000,
 2,500  Units to $250,000 etc., and will be  applied on that basis which is more
 favorable to the purchaser.
 
    For "secondary market"  sales the  Public Offering  Price per  Unit of  each
Trust is determined by adding to the Trustee's determination of the BID price of
each  Bond in the Trust  a sales charge determined  in accordance with the table
set forth below based upon the number of years remaining to the maturity of each
such Bond, adjusting  the total to  reflect the amount  of any cash  held in  or
advanced  to the principal account  of the Trust and  dividing the result by the
number of Units then outstanding. For  purposes of this calculation, Bonds  will
be  deemed to mature on  their stated maturity dates  unless: (a) the Bonds have
been called for redemption or funds or securities have been placed in escrow  to
redeem  them on  an earlier  call date, in  which case  such call  date shall be
deemed to be the date upon which they mature; or (b) such Bonds are subject to a
"mandatory put," in which case such mandatory put date shall be deemed to be the
date upon  which  they  mature.  Any assumptions  regarding  maturity  made  for
purposes  of  determining the  appropriate  sales charge  in  no way  predict or
guarantee the actual remaining life of a given Trust.
 
    Pursuant to the terms of the Indenture, the Trustee may terminate a Trust if
the net asset value of such Trust, as shown by any evaluation, is less than  20%
of  the  original principal  amount of  the  Trust. In  the course  of regularly
appraising the  value  of Bonds  in  each Trust,  the  Sponsor will  attempt  to
estimate  the date on which a Trust's value  will fall below the 20% level based
on anticipated bond events over a five year period, including maturities, escrow
calls and  current  calls or  refundings,  assuming certain  market  rates.  The
Sponsor  intends from time to time to recommend that certain Trusts whose values
 
                                      A-14
<PAGE>
have fallen or are anticipated to fall  below the 20% level be terminated  based
on  certain criteria which  could adversely affect  the Trust's diversification.
Once the Sponsor has determined that a  Trust's value has or may fall below  the
20%  level within a five-year period, for purposes of computing the sales charge
using the table set forth below, the maturity of each bond in such Trust will be
deemed to be the earlier of the estimated termination date of the Trust, or  the
actual  date used  when pricing the  bond under  Municipal Securities Rulemaking
Board rules and interpretations issued thereunder.
 
    The effect of this method of sales charge calculation will be that different
sales charge rates will  be applied to  the various Bonds  in a Trust  portfolio
based  upon  the maturities  of  such Bonds,  in  accordance with  the following
schedule. As  shown, the  sales charge  on  Bonds in  each maturity  range  (and
therefore the aggregate sales charge on the purchase) is reduced with respect to
purchases of at least $50,000 or 500 Units:
<TABLE>
<CAPTION>
                                                                  AMOUNT OF PURCHASE*
                             ---------------------------------------------------------------------------------------------
<S>                          <C>          <C>          <C>          <C>          <C>          <C>            <C>
                                            $50,000     $100,000     $250,000     $500,000     $1,000,000     $2,500,000
                                UNDER         TO           TO           TO           TO            TO             TO
YEARS TO MATURITY              $50,000      $99,999     $249,999     $499,999     $999,999     $2,499,999     $4,999,999
- ---------------------------  -----------  -----------  -----------  -----------  -----------  -------------  -------------
Less than 1................           0            0            0            0            0             0              0
1 but less than 2..........       1.523%       1.446%       1.369%       1.317%       1.215%        1.061%          .900%
2 but less than 3..........       2.041        1.937        1.833        1.729        1.626         1.420          1.225
3 but less than 4..........       2.564        2.433        2.302        2.175        2.041         1.781          1.546
4 but less than 5..........       3.093        2.961        2.828        2.617        2.459         2.175          1.883
5 but less than 7..........       3.627        3.433        3.239        3.093        2.881         2.460          2.165
7 but less than 10.........       4.167        3.951        3.734        3.520        3.239         2.828          2.489
10 but less than 13........       4.712        4.467        4.221        4.004        3.788         3.253          2.842
13 but less than 16........       5.263        4.988        4.712        4.439        4.167         3.627          3.169
16 or more.................       5.820        5.542        5.263        4.987        4.603         4.004          3.500
 
<CAPTION>
 
<S>                          <C>
 
                              $5,000,000
YEARS TO MATURITY               OR MORE
- ---------------------------  -------------
Less than 1................            0
1 but less than 2..........         .750%
2 but less than 3..........        1.030
3 but less than 4..........        1.310
4 but less than 5..........        1.590
5 but less than 7..........        1.870
7 but less than 10.........        2.150
10 but less than 13........        2.430
13 but less than 16........        2.710
16 or more.................        3.000
</TABLE>
 
 *Breakpoint  sales charges are computed both on a dollar basis and on the basis
  of the  number  of Units  purchased,  using the  equivalent  of 500  Units  to
  $50,000,  2,500 Units  to $250,000,  etc., and will  be applied  on that basis
  which is more favorable to the purchaser.
 
    The secondary market sales charges above  are expressed as a percent of  the
net  amount invested; expressed as  a percent of the  Public Offering Price, the
maximum sales charge on  any Trust, including one  consisting entirely of  Bonds
with  16 years  or more to  maturity, would be  5.50% (5.820% of  the net amount
invested). For purposes of illustration, the sales charge on a Trust  consisting
entirely  of Bonds maturing  in 13 to  16 years would  be 5% (5.263%  of the net
amount invested); that on a Trust consisting entirely of Bonds maturing in  five
to  seven years would be 3.5% (3.627% of the net amount invested); and that on a
Trust consisting entirely of Bonds maturing in three to four years would be 2.5%
(2.564% of the net  amount invested). The actual  secondary market sales  charge
included in the Public Offering Price of any particular Trust will depend on the
maturities of the Bonds in the portfolio of such Trust.
 
    At  all  times while  Units are  being  offered for  sale, the  Sponsor will
appraise or cause to  be appraised daily  the value of  the underlying Bonds  in
each  Trust as of 4:00 p.m. eastern time on each day on which the New York Stock
Exchange (the "Exchange") is normally open  and will adjust the Public  Offering
Price  of the Units commensurate with such appraisal. Such Public Offering Price
will be effective for all orders received by a dealer or the Sponsor at or prior
to 4:00 p.m. eastern time on each such day. Orders received after that time,  or
on a day when the Exchange is closed for a scheduled holiday or weekend, will be
held until the next determination of price.
 
    As  more fully set forth  in Section 8, accrued  interest from the preceding
Record Date to, but not including, the settlement date of the transaction  (five
business  days after  purchase) will  be added to  the Public  Offering Price to
determine the purchase price of Units.
 
                                      A-15
<PAGE>
    The above graduated sales charges will apply on all applicable purchases  of
Nuveen investment company securities on any one day by the same purchaser in the
amounts stated, and for this purpose purchases of this Series will be aggregated
with  concurrent purchases  of any  other Series  or of  shares of  any open-end
management investment company of which the Sponsor is principal underwriter  and
with respect to the purchase of which a sales charge is imposed.
 
    Purchases  by or for the account of an  individual and his or her spouse and
children under 21 years  of age will be  aggregated to determine the  applicable
sales  charge. The graduated sales  charges are also applicable  to a trustee or
other fiduciary  purchasing  securities for  a  single trust  estate  or  single
fiduciary account.
 
    Units  may be purchased at the Public  Offering Price without a sales charge
by officers or directors and by bona fide, full-time employees of Nuveen, Nuveen
Advisory Corp., Nuveen Institutional Advisory Corp. and The John Nuveen Company,
including in each case these individuals and their immediate family members  (as
defined above).
 
    Units  may be  purchased in  the primary or  secondary market  at the Public
Offering Price for  non-breakpoint purchases  minus the  concession the  Sponsor
typically  allows  to  brokers  and dealers  for  non-breakpoint  purchases (see
Section 17)  by  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, and by 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.  Notwithstanding anything to
the contrary in this Prospectus, investors and bank trust departments purchasing
Units through this program will not receive sales charge reductions for quantity
purchases.
 
    The initial or primary Public Offering Price  of the Units in each Trust  is
based upon a pro rata share of the OFFERING prices per Unit of the Bonds in such
Trust  plus the  applicable sales charge.  The secondary  market Public Offering
Price of each Trust is based upon a pro rata share of the BID prices per Unit of
the Bonds in such Trust plus the applicable sales charge. The OFFERING prices of
Bonds in a Trust may be expected to average approximately 1% to 2% more than the
BID prices of such Bonds  in the case of  National, Long Intermediate and  State
Trusts,  3/4%  to 1  1/2% in  the  case of  Intermediate and  Short Intermediate
Trusts, and  1/2% to  3/4% in  the case  of Short  Term Trusts.  The  difference
between the bid side evaluation and the offering side evaluation of the Bonds in
each  Trust on the  business day prior  to the Date  of Deposit is  shown in the
discussion of each Trust portfolio.
 
    Whether or not Units are being offered for sale, the Sponsor will  determine
the aggregate value of each Trust as of 4:00 p.m. eastern time: (i) on each June
30 or December 31 (or, if such date is not a business day, the last business day
prior  thereto), (ii) on any day on which  a Unit is tendered for redemption (or
the next succeeding business day  if the date of  tender is a non-business  day)
and (iii) at such other times as may be necessary. For this purpose, a "business
day" shall be any day on which the Exchange is normally open. (See Section 16.)
 
7.  MARKET FOR UNITS
 
During  the  initial public  offering period,  the Sponsor  intends to  offer to
purchase Units of each  Trust at a  price equivalent to the  pro rata share  per
Unit  of the OFFERING prices of the Bonds in such Trust (plus accrued interest).
Afterward, although  it  is not  obligated  to do  so,  the Sponsor  intends  to
maintain  a secondary  market for  Units of  each Trust  at its  own expense and
continuously to offer  to purchase  Units of each  Trust at  prices, subject  to
 
                                      A-16
<PAGE>
change  at  any time,  which  are based  upon  the BID  prices  of Bonds  in the
respective portfolios of the Trusts. If the supply of Units of any of the Trusts
of this Series exceeds  demand, or for some  other business reason, the  Sponsor
may discontinue purchases of Units of such Trust at such prices. UNITHOLDERS WHO
WISH  TO DISPOSE OF THEIR UNITS SHOULD INQUIRE OF THE TRUSTEE OR THEIR BROKER AS
TO THE  CURRENT  REDEMPTION PRICE  (SEE  SECTION  19). In  connection  with  its
secondary  marketmaking activities, the Sponsor may from time to time enter into
secondary market  joint  account  agreements with  other  brokers  and  dealers.
Pursuant to such an agreement the Sponsor will purchase Units from the broker or
dealer at the bid price and will place the Units into a joint account managed by
the  Sponsor; sales from  the account will  be made in  accordance with the then
current prospectus and the Sponsor and  the broker or dealer will share  profits
and  losses in  the joint account  in accordance  with the terms  of their joint
account agreement.
 
    Certificates, if any, for Units are  delivered to the purchaser as  promptly
after  the date of settlement (five business days after purchase) as the Trustee
can complete the mechanics of registration. Normally, Certificates, if any,  are
mailed  by  the  Trustee within  48  hours after  registration  instructions are
received. Purchasers of Units to whom Certificates are issued will be unable  to
exercise  any right of redemption until they have received their Certificates as
tender of the Certificate, properly endorsed for transfer. (See Section 19.)
 
    Each Unit  of each  respective Trust  initially offered  by this  Prospectus
represents  that fractional  undivided interest  in such  Trust as  is set forth
under "Essential Information Regarding the Trusts." To the extent that any Units
of any Trust are  redeemed by the  Trustee, the aggregate  value of the  Trust's
assets  will decrease by  the amount paid  to the redeeming  Unitholder, but the
fractional undivided  interest  of  each  unredeemed Unit  in  such  Trust  will
increase  proportionately. The  Sponsor will  initially, and  from time  to time
thereafter, hold Units in connection with their offering.
 
8.  WHAT IS ACCRUED INTEREST?
 
Accrued interest is the accumulation of unpaid interest on a bond from the  last
day  on which  interest thereon  was paid.  Interest on  Bonds in  each Trust is
accounted for daily on an accrual basis. For this reason, the purchase price  of
Units  of a Trust will  include not only the Public  Offering Price but also the
proportionate share  of accrued  interest to  the date  of settlement.  Interest
accrues  to the  benefit of Unitholders  commencing with the  settlement date of
their purchase transaction.
 
    Accrued interest does not include accrual of original issue discount on zero
coupon bonds, Stripped Obligations or other original issue discount bonds.  (See
"Summary  of Portfolios--General Trust Information" and  "What Is The Tax Status
of Unitholders.")
 
    In an effort to reduce the  amount of accrued interest that investors  would
have  to pay in addition to the Public Offering Price, the Trustee has agreed to
advance to each Trust the amount of accrued interest due on the Bonds as of  the
Date  of Deposit (which has been designated  the first Record Date for all plans
of distribution).  This accrued  interest will  be paid  to the  Sponsor as  the
holder  of record of  all Units on  the Date of  Deposit. Consequently, when the
Sponsor sells Units of a  Trust, the amount of accrued  interest to be added  to
the  Public Offering Price to determine the  purchase price of the Units of such
Trust purchased by an investor will include only accrued interest from the  Date
of  Deposit to,  but not  including, the  date of  settlement of  the investor's
purchase (five business days  after purchase), less  any distributions from  the
related  Interest Account.  The Trustee  will recover  its advancements (without
interest or  other cost  to the  Trusts)  from interest  received on  the  Bonds
deposited in each Trust.
 
    The  Trustee has no  cash for distribution to  Unitholders until it receives
interest payments on the Bonds in  the Trusts. Since municipal bond interest  is
accrued daily but
 
                                      A-17
<PAGE>
paid  only semi-annually, during the initial  months of the Trusts, the Interest
Accounts, consisting of accrued but uncollected interest and collected  interest
(cash),  will  be predominantly  the uncollected  accrued  interest that  is not
available for distribution. However, due to advances by the Trustee, the Trustee
will provide a first distribution between approximately 30 and 60 days after the
Date of Deposit. Assuming each Trust  retains its original size and  composition
and expenses and fees remain the same, annual interest collected and distributed
will  approximate  the  estimated  Net  Annual  Interest  Income  stated herein.
However, the amount of  accrued interest at  any point in  time will be  greater
than  the amount that the Trustee will have actually received and distributed to
the Unitholders. Therefore, there will always remain an item of accrued interest
that is included in the Purchase Price and the redemption price of the Units.
 
    Interest is accounted  for daily and  a proportionate share  of accrued  and
undistributed  interest computed from the preceding  Record Date is added to the
daily valuation of each Unit  of each Trust. (See Sections  3 and 13.) As  Bonds
mature,  or are redeemed or sold, the  accrued interest applicable to such bonds
is collected and subsequently distributed  to Unitholders. Unitholders who  sell
or redeem all or a portion of their Units will be paid their proportionate share
of  the remaining accrued interest to, but not including, the fifth business day
following the date of sale or tender.
 
9.  WHAT ARE ESTIMATED LONG TERM RETURN AND ESTIMATED CURRENT RETURN?
 
The Estimated Long Term Return for each Trust is a measure of the return to  the
investor  earned over the estimated  life of the Trust.  The Estimated Long Term
Return represents an average of the yields to maturity (or call) of the Bonds in
the Trust's portfolio calculated in  accordance with accepted bond practice  and
adjusted  to reflect expenses  and sales charges.  Under accepted bond practice,
tax-exempt bonds are customarily offered to investors on a "yield price"  basis,
which  involves computation  of yield  to maturity  or to  an earlier  call date
(whichever produces the lower yield), and which takes into account not only  the
interest  payable  on the  bonds but  also  the amortization  or accretion  to a
specified date of any premium over or discount from the par (maturity) value  in
the  bond's  purchase  price. In  calculating  Estimated Long  Term  Return, the
average yield for  the Trust's  portfolio is  derived by  weighting each  Bond's
yield by the market value of the Bond and by the amount of time remaining to the
date  to which the Bond is priced. Once the average portfolio yield is computed,
this figure is then reduced to reflect estimated expenses and the effect of  the
maximum  sales  charge  paid  by  investors.  The  Estimated  Long  Term  Return
calculation does not take into account the effect of a first distribution  which
may  be less than a regular  distribution or may be paid  at some point after 30
days (or a second distribution which may be less than a normal distribution  for
Unitholders  who choose quarterly or semi-annual  plans of distribution), and it
also does  not  take  into account  the  difference  in timing  of  payments  to
Unitholders  who choose quarterly or semi-annual  plans of distribution, each of
which will reduce the return.
 
    Estimated Current Return  is computed  by dividing the  Net Annual  Interest
Income per Unit by the Public Offering Price. In contrast to Estimated Long Term
Return, Estimated Current Return does not reflect the amortization of premium or
accretion of discount, if any, on the Bonds in the Trust's portfolio. Net Annual
Interest Income per Unit is calculated by dividing the annual interest income to
the Trust, less estimated expenses, by the number of Units outstanding.
 
    Net  Annual Interest  Income per Unit,  used to  calculate Estimated Current
Return, will vary  with changes  in fees  and expenses  of the  Trustee and  the
Evaluator  and with the redemption, maturity, exchange or sale of Bonds. A Trust
may experience expenses and  portfolio changes different  from those assumed  in
the calculation of Estimated Long Term
 
                                      A-18
<PAGE>
Return.  There thus can  be no assurance  that the Estimated  Current Returns or
Estimated Long Term  Returns quoted  herein will be  realized in  the future.  A
Unitholder's  actual return may vary  significantly from the Estimated Long-Term
Return, based  on their  holding  period, market  interest rate  changes,  other
factors  affecting  the  prices  of  individual  bonds  in  the  portfolio,  and
differences between  the expected  remaining  life of  portfolio bonds  and  the
actual length of time that they remain in the Trust; such actual holding periods
may  be reduced  by termination  of the  Trust, as  described in  "AMENDMENT AND
TERMINATION OF  INDENTURE." Since  both  the Estimated  Current Return  and  the
Estimated  Long Term Return quoted  herein are based on  the market value of the
underlying Bonds on the  business day prior to  the Date of Deposit,  subsequent
calculations  of these performance measures will reflect the then current market
value of the underlying Bonds and may be higher or lower.
 
    A portion of the  monies received by  a Trust may be  treated, in the  first
year  only, as a return of principal due to the inclusion in the Trust portfolio
of "when-issued"  or  other  Bonds  having delivery  dates  after  the  date  of
settlement  for purchases  made on  the Date of  Deposit. A  consequence of this
treatment is that in the computation  of Estimated Current Return for the  first
year, such monies are excluded from Net Annual Interest Income and treated as an
adjustment  to the Public Offering  Price. (See "Essential Information Regarding
the Trusts" and Sections 4 and 11.)
 
    For a statement of the Net Annual Interest Income per Unit under the monthly
plan of  distribution,  and Estimated  Long  Term Yield  and  Estimated  Current
Returns based on the Public Offering Prices of the Trusts in this Series, all as
of  the day prior to  the Date of Deposit,  see "Essential Information Regarding
the Trusts."
 
10.  HOW WAS THE PRICE OF THE BONDS DETERMINED AT THE DATE OF DEPOSIT?
 
The prices at which the Bonds deposited in the Trusts would have been offered to
the public on the business day prior  to the Date of Deposit were determined  by
the  Trustee on the basis  of an evaluation of such  Bonds prepared by Kenny S&P
Evaluation Services, a  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 evaluated
the Bonds as so insured. (See Section 5).
 
    The amount by which  the Trustee's determination of  the OFFERING PRICES  of
the  Bonds deposited  in the Trusts  was greater or  less than the  cost of such
Bonds to  the  Sponsor was  PROFIT  OR LOSS  to  the Sponsor  exclusive  of  any
underwriting  profit.  (See Section  3.) The  Sponsor  also may  realize FURTHER
PROFIT OR  SUSTAIN  FURTHER LOSS  as  a result  of  fluctuations in  the  Public
Offering  Price of the Units. Cash, if  any, made available to the Sponsor prior
to the settlement date for a purchase  of Units, or prior to the acquisition  of
all  Portfolio securities by a Trust, may  be available for use in the Sponsor's
business, and may be of benefit to the Sponsor.
 
11.  WHAT IS THE TAX STATUS OF UNITHOLDERS?
 
At the  respective times  of issuance  of  the Bonds  opinions relating  to  the
validity  thereof and to  the exemption of interest  thereon from Federal income
tax were rendered  by bond  counsel to  the respective  issuing authorities.  In
addition,  with respect to  State Trusts, where applicable,  bond counsel to the
issuing authorities rendered opinions  as to the exemption  of interest on  such
Bonds,  when held by residents  of the state in which  the issuers of such Bonds
are located, from state income taxes and certain state or local intangibles  and
local  income taxes.  For a  discussion of  the tax  status of  State Trusts see
"Summary of  Portfolios--  Tax Status"  for  the respective  State  Trust.  (See
Sections  2 and 3.)  Neither the Sponsor  nor its counsel  have made any special
review for the Trusts of the proceedings  relating to the issuance of the  Bonds
or of the basis for the opinions rendered in connection therewith.
 
                                      A-19
<PAGE>
    Taxpayers  must  disclose  on  their  Federal  tax  returns  the  amount  of
tax-exempt  interest  earned  during  the  year.  Federally  tax-exempt  income,
including  income on Units  of the Trusts,  will be taken  into consideration in
computing the portion, if any, of social security benefits received that will be
included in a taxpayer's gross income subject to the Federal income tax.
 
    Gain realized on the sale or redemption of the Bonds by the Trustee or of  a
Unit  by  a Unitholder  is includable  in  gross income  for Federal  income tax
purposes, and may be  includable in gross income  for state tax purposes.  (Such
gain  does not include  any amounts received  in respect of  accrued interest or
accrued original  issue  discount,  if  any.) It  should  be  noted  that  under
provisions  of the Revenue Reconciliation Act  of 1993 (the "Tax Act") described
below that subject accretion of market discount on tax-exempt bonds to  taxation
as  ordinary income,  gain realized on  the sale  or redemption of  Bonds by the
Trustee or of Units by a Unitholder that would have been treated as capital gain
under prior law is treated as ordinary  income to the extent it is  attributable
to  accretion of market discount.  Market discount can arise  based on the price
the Trust pays  for the  Bonds or the  price a  Unitholder pays for  his or  her
Units.
 
    In the opinion of Chapman and Cutler, Counsel to the Sponsor, under existing
law:
 
    (1) the  Trusts  are not  associations taxable  as corporations  for Federal
        income tax purposes. Tax-exempt interest received by each of the  Trusts
        on  Bonds  deposited  therein  will  retain  its  status  as  tax-exempt
        interest, for Federal income tax  purposes, when received by the  Trusts
        and  when distributed  to the  Unitholders, except  that the alternative
        minimum tax and  environmental tax (the  "Superfund Tax") applicable  to
        corporate  Unitholders  may, in  certain  circumstances, include  in the
        amount on which  such taxes  are calculated  a portion  of the  interest
        income  received by  the Trust. See  "Certain Tax  Matters Applicable to
        Corporate Unitholders", below;
 
    (2) each Unitholder of a Trust is considered  to be the owner of a pro  rata
        portion  of such Trust under Subpart E, subchapter J of Chapter 1 of the
        Internal Revenue Code of 1986 (the "Code") and will have a taxable event
        when the Trust  disposes of  a Bond or  when the  Unitholder redeems  or
        sells  Units. Unitholders must  reduce the tax basis  of their Units for
        their share of accrued interest received by the Trust, if any, on  Bonds
        delivered  after  the  date the  Unitholders  pay for  their  Units and,
        consequently, such Unitholders may have  an increase in taxable gain  or
        reduction  in capital loss  upon the disposition of  such Units. Gain or
        loss upon the sale or redemption  of Units is measured by comparing  the
        proceeds  of  such sale  or redemption  with the  adjusted basis  of the
        Units. If the  Trustee disposes of  Bonds (whether by  sale, payment  at
        maturity,  redemption or otherwise),  gain or loss  is recognized to the
        Unitholder. The amount of any such gain or loss is measured by comparing
        the Unitholder's  pro  rata  share  of  the  total  proceeds  from  such
        disposition  with  the  Unitholder's  basis for  his  or  her fractional
        interest in  the asset  disposed of.  In the  case of  a Unitholder  who
        purchases Units, such basis (before adjustment for earned original issue
        discount   and  amortized  bond  premium,   if  any)  is  determined  by
        apportioning the  cost of  the  Units among  each  of the  Trust  assets
        ratably  according to value as of the  date of acquisition of the Units.
        The  tax  cost   reduction  requirements  of   said  Code  relating   to
        amortization  of bond premium  may, under some  circumstances, result in
        the Unitholder realizing a taxable gain  when his or her Units are  sold
        or redeemed for an amount equal to their original cost; and
 
    (3) any  amounts paid on defaulted Bonds  held by the Trustee under policies
        of insurance issued with respect to  such Bonds will be excludable  from
        Federal  gross income if, and to the same extent as, such interest would
        have been so excludable if
 
                                      A-20
<PAGE>
        paid by the respective issuer provided  that, at the time such  policies
        are  purchased,  the  amounts  paid for  such  policies  are reasonable,
        customary and consistent with the reasonable expectation that the issuer
        of the bonds,  rather than  the insurer, will  pay debt  service on  the
        bonds. Paragraph (2) of this opinion is accordingly applicable to policy
        proceeds representing maturing interest.
 
In the opinion of Carter, Ledyard & Milburn, counsel to the Trustee, and, in the
absence  of a New York Trust from the Series, special counsel for the Series for
New York tax matters, under existing law:
 
        Under the income tax laws of the State and City of New York, each  Trust
    is  not an association taxable as a corporation and the income of each Trust
    will be treated as the income of the Unitholders.
 
    For a summary  of each opinion  of special counsel  to the respective  State
Trusts for state tax matters, see Section 3.
 
    ALL STATEMENTS IN THE PROSPECTUS CONCERNING EXEMPTION FROM FEDERAL, STATE OR
OTHER TAXES ARE THE OPINION OF COUNSEL AND ARE TO BE SO CONSTRUED.
 
    The  redemption of Units in a Trust by  a Unitholder would result in each of
the remaining Unitholders of said Trust owning a greater proportionate  interest
in  the remaining assets of  said Trust. Although present  law does not directly
address this matter, it  would appear reasonable  that a remaining  Unitholder's
tax  basis in his  Units would include  his proportionate share  of any proceeds
received by the Trust on the sale of bonds which were not distributed to him but
were instead used by  the Trust to redeem  Units and that his  tax basis in  the
remaining  assets of the Trust  would accordingly be increased  by such share of
proceeds, based on the relative fair market value of the remaining assets of the
Trust as of the date of such redemption.
 
    Sections 1288 and 1272 of the Code provide a complex set of rules  governing
the  accrual of original issue discount. These rules provide that original issue
discount accrues either  on the basis  of a constant  compound interest rate  or
ratably over the term of the Bond, depending on the date the Bond was issued. In
addition,  special  rules apply  if the  purchase  price of  a Bond  exceeds the
original issue price plus the amount of original issue discount which would have
previously accrued based upon its issue price (its "adjusted issue price").  The
application  of these rules will also vary depending on the value of the Bond on
the date a Unitholder acquires his Units, and the price the Unitholder pays  for
his  Units. The  accrual of  tax-exempt original  issue discount  on zero coupon
bonds and other original issue discount bonds will result in an increase in  the
Unitholder's  basis in  such obligations and,  accordingly, in his  basis in his
Units.
 
    The Tax Act subjects  tax-exempt bonds to the  market discount rules of  the
Code  effective for  bonds purchased  after April  30, 1993.  In general, market
discount is the amount (if any) by which the stated redemption price at maturity
exceeds an investor's purchase price (except to the extent that such difference,
if any, is attributable to original  issue discount not yet accrued). Under  the
Tax Act, accretion of market discount is taxable as ORDINARY INCOME; under prior
law,  the  accretion had  been  treated as  capital  gain. Market  discount that
accretes while the Trust holds a Bond would be recognized as ordinary income  by
the  Unitholders when principal payments are received  on the Bond, upon sale or
at redemption (including early  redemption), or upon the  sale or redemption  of
his  or her  Units, unless  a Unitholder  elects to  include market  discount in
taxable income  as  it  accrues.  The market  discount  rules  are  complex  and
Unitholders  should consult their  tax advisors regarding  these rules and their
application.
 
    The Internal Revenue Code provides that interest on indebtedness incurred or
continued to purchase  or carry  obligations, the  interest on  which is  wholly
exempt from Federal
 
                                      A-21
<PAGE>
income  taxes, is not deductible. Because each Unitholder is treated for Federal
income tax purposes as the owner of a  pro rata share of the Bonds owned by  the
applicable  Trust, interest on borrowed funds used to purchase or carry Units of
such Trust will not be deductible  for Federal income tax purposes. Under  rules
used  by the  Internal Revenue Service  for determining when  borrowed funds are
considered used for the purpose of purchasing or carrying particular assets, the
purchase of Units may be considered to  have been made with borrowed funds  even
though  the borrowed funds are  not directly traceable to  the purchase of Units
(however, these rules generally  do not apply to  interest paid on  indebtedness
incurred  to  purchase  or  improve a  personal  residence).  Similar  rules are
generally applicable for state tax purposes. Special rules apply in the case  of
certain  financial  institutions that  acquire  Units. Investors  with questions
regarding these issues should consult with their tax advisers.
 
    In general,  each  issue  of bonds  in  the  Trusts is  subject  to  certain
post-issuance  requirements which must be  met in order for  the interest on the
Bonds to be and remain exempt from Federal income taxation. Bond counsel to each
issuer generally has opined that, assuming continuing compliance by such issuers
with certain covenants, interest on such  Bonds will continue to be exempt  from
Federal income taxation (other than with respect to the application to corporate
Unitholders  of the alternative  minimum tax or the  Superfund Tax, as discussed
below).
 
    For purposes of computing  the alternative minimum  tax for individuals  and
corporations, interest on certain specified tax-exempt private activity bonds is
included as a preference item. The Trusts do not include any such bonds.
 
    For  taxpayers  other than  corporations,  net capital  gains  are presently
subject to a maximum tax  rate of 28 percent. However,  it should be noted  that
legislative proposals are introduced from time to time that affect tax rates and
could affect relative differences at which ordinary income and capital gains are
taxed.
 
    CERTAIN  TAX MATTERS  APPLICABLE TO  CORPORATE UNITHOLDERS.  In the  case of
certain corporations, the alternative minimum  tax and the Superfund Tax  depend
upon the corporation's alternative minimum taxable income ("AMTI"), which is the
corporation's  taxable income  with certain  adjustments. One  of the adjustment
items used in computing AMTI and the Superfund Tax of a corporation (other  than
an S corporation, Regulated Investment Company, Real Estate Investment Trust, or
REMIC)  is an amount equal to 75%  of the excess of such corporation's "adjusted
current earnings" over an amount equal to its AMTI (before such adjustment  item
and  the  alternative tax  net  operation loss  deduction).  Although tax-exempt
interest received by each of the Trusts  on Bonds deposited therein will not  be
included  in the gross  income of corporations for  Federal income tax purposes,
"adjusted current earnings" includes all tax-exempt interest, including interest
on all Bonds in the Trust and tax-exempt original issue discount.
 
    Corporate Unitholders  are urged  to  consult their  own tax  advisers  with
respect  to the particular tax consequences  to them resulting under the Federal
tax law, including the corporate alternative minimum tax, the Superfund Tax  and
the branch profits tax imposed by Section 884 of the Code.
 
    EXCEPT  AS NOTED ABOVE AND IN SECTION  3, THE EXEMPTION OF INTEREST ON STATE
AND LOCAL  OBLIGATIONS FOR  FEDERAL  INCOME TAX  PURPOSES DOES  NOT  NECESSARILY
RESULT IN EXEMPTION UNDER THE INCOME OR OTHER TAX LAWS OF ANY STATE OR CITY. THE
LAWS  OF  THE  SEVERAL  STATES  VARY  WITH  RESPECT  TO  THE  TAXATION  OF  SUCH
OBLIGATIONS.
 
12.  WHAT ARE NORMAL TRUST OPERATING EXPENSES?
 
No annual advisory fee is charged the  Trusts by the Sponsor. The Sponsor  does,
however,  receive a fee  of $0.17 per  annum per $1,000  principal amount of the
underlying Bonds in
 
                                      A-22
<PAGE>
each Trust for regularly evaluating  the Bonds and for maintaining  surveillance
over the portfolio. (See Section 16.)
 
    The  Trustee receives for ordinary recurring services an annual fee for each
plan of  distribution for  each Trust  as set  forth in  "Essential  Information
Regarding  the Trusts." Each  annual fee is  per $1,000 principal  amount of the
underlying Bonds in  a Trust for  that portion  of the Trust  that represents  a
particular  plan of distribution. The Trustee's fee may be periodically adjusted
in response to fluctuations in short-term interest rates (reflecting the cost to
the Trustee of advancing funds to  a Trust to meet scheduled distributions)  and
may be further adjusted in accordance with the cumulative percentage increase of
the  United  States Department  of Labor's  Consumer  Price Index  entitled "All
Services Less Rent" since the establishment  of the Trusts. The Trustee has  the
use  of funds, if any, being held in the Interest and Principal Accounts of each
Trust for  future  distributions, payment  of  expenses and  redemptions.  These
Accounts  are non-interest  bearing to  Unitholders. Pursuant  to normal banking
procedures, the Trustee benefits from the use of funds held therein. Part of the
Trustee's compensation for its services to  the Fund is expected to result  from
such use of these funds.
 
    Premiums  for the policies  of insurance obtained  by the Sponsor  or by the
Bond issuers with respect to the Bonds in the Insured Trusts and with respect to
insured Bonds in Traditional Trusts have been paid in full prior to the  deposit
of the Bonds in the Trusts, and the value of such insurance has been included in
the evaluation of the Bonds in each Trust and accordingly in the Public Offering
Price  of Units of each Trust. There  are no annual continuing premiums for such
insurance.
 
    The Sponsor has borne all costs of creating and establishing the Trusts. The
following are  expenses of  the Trusts  and, when  paid by  or are  owed to  the
Trustee,  are secured by  a lien on the  assets of the Trust  or Trusts to which
such expenses are allocable: (1) the expenses and costs of any action undertaken
by the  Trustee to  protect  the Trusts  and the  rights  and interests  of  the
Unitholders;  (2) all taxes and other governmental charges upon the Bonds or any
part of the Trusts (no such taxes or charges are being levied or made or, to the
knowledge of the Sponsor, contemplated); (3)  amounts payable to the Trustee  as
fees  for  ordinary  recurring  services  and  for  extraordinary  non-recurring
services rendered  pursuant to  the Indenture,  all disbursements  and  expenses
including  counsel fees  (including fees of  bond counsel which  the Trustee may
retain) sustained or incurred  by the Trustee in  connection therewith; and  (4)
any  losses or liabilities accruing to the Trustee without negligence, bad faith
or willful misconduct on  its part. The  Trustee is empowered  to sell Bonds  in
order  to  pay  these  amounts  if funds  are  not  otherwise  available  in the
applicable Interest and Principal Accounts.
 
    The Indenture requires each Trust  to be audited on  an annual basis at  the
expense  of the Trust by independent public accountants selected by the Sponsor.
The Trustee  shall not  be  required, however,  to cause  such  an audit  to  be
performed  if its cost to a Trust shall exceed $.05 per Unit on an annual basis.
Unitholders of a  Trust covered by  an audit may  obtain a copy  of the  audited
financial statements upon request.
 
13.  WHEN ARE DISTRIBUTIONS MADE TO UNITHOLDERS?
 
Interest received by the Trustee on the Bonds in each Trust, including that part
of  the proceeds of  any disposition of Bonds  which represents accrued interest
and including  any insurance  proceeds representing  interest due  on  defaulted
Bonds,  shall be credited to the "Interest  Account" of such Trust and all other
moneys received by the Trustee shall  be credited to the "Principal Account"  of
such Trust.
 
    The  pro rata share of  cash in the Principal Account  in each Trust will be
computed as of each semi-annual Record Date and distributions to the Unitholders
as of such Record Date
 
                                      A-23
<PAGE>
will be  made on  or shortly  after the  fifteenth day  of the  month.  Proceeds
received  from the disposition, including sale, call  or maturity, of any of the
Bonds and  all amounts  paid with  respect  to zero  coupon bonds  and  Stripped
Obligations  will be held  in the Principal  Account and either  used to pay for
Units redeemed  or  distributed on  the  Distribution Date  following  the  next
semi-annual Record Date. The Trustee is not required to make a distribution from
the  Principal Account of any Trust unless the amount available for distribution
in such account equals at least ten cents per Unit.
 
    The pro rata share of the Interest Account in each Trust will be computed by
the Trustee each month as of each Record Date and distributions will be made  on
or  shortly after the fifteenth day of the month to Unitholders of such Trust as
of the Record Date who are entitled to distributions at that time under the plan
of distribution chosen. Persons who purchase  Units between a Record Date and  a
Distribution Date will receive their first distribution on the Distribution Date
following the next Record Date under the applicable plan of distribution.
 
    Purchasers  of  Units  who desire  to  receive interest  distributions  on a
monthly or quarterly basis may elect to do so at the time of purchase during the
initial public offering  period. Those indicating  no choice will  be deemed  to
have  chosen the  semi-annual distribution  plan. All  Unitholders, however, who
purchase Units during the  initial public offering period  and who hold them  of
record on the first Record Date will receive the first distribution of interest.
Thereafter, Record Dates for monthly distributions will be the first day of each
month;  Record  Dates  for quarterly  distributions  will  be the  first  day of
February,  May,  August   and  November;  and   Record  Dates  for   semi-annual
distributions will be the first day of May and November.
 
    Details  of distributions  per Unit  of each  Trust under  the various plans
based upon estimated Net Annual Interest Income at the Date of Deposit are shown
in the tables appearing  in Section 3. The  amount of the regular  distributions
will  remain the same so long as each  Trust portfolio remains the same and fees
and expenses remain the same, and will generally change when Bonds are redeemed,
mature or are sold or when fees and expenses increase or decrease.
 
    The plan of  distribution selected  by a  Unitholder will  remain in  effect
until  changed.  Unitholders  purchasing  Units  in  the  secondary  market will
initially receive distributions  in accordance  with the election  of the  prior
owner.  Unitholders desiring to change  their plan of distribution  may do so by
sending  a   written   notice  requesting   the   change,  together   with   any
Certificate(s),  to  the  Trustee. The  notice  and any  Certificate(s)  must be
received by  the  Trustee not  later  than the  semi-annual  Record Date  to  be
effective   as  of   the  semi-annual  distribution   following  the  subsequent
semi-annual Record  Date. Unitholders  are requested  to make  any such  changes
within  45 days prior to the applicable Record Date. Certificates should only be
sent by registered or certified mail to minimize the possibility of their  being
lost or stolen. (See Section 18.) If no notice is received in proper form by the
Trustee,  the Unitholder  will be  deemed to have  elected to  continue the same
plan.
 
    As of the first day of each month the Trustee will deduct from the  Interest
Account  of a Trust or, to the extent funds are not sufficient therein, from the
Principal Account of  a Trust, amounts  needed for payment  of expenses of  such
Trust.  The Trustee also may withdraw from said accounts such amount, if any, as
it deems necessary to establish a  reserve for any governmental charges  payable
out  of such Trust. Amounts  so withdrawn shall not be  considered a part of the
Trust's assets until such time  as the Trustee shall return  all or any part  of
such amounts to the appropriate account.
 
    For  the purpose  of minimizing fluctuations  in the  distributions from the
Interest Account of a Trust, the  Trustee is authorized to advance such  amounts
as may be necessary to provide for interest distributions of approximately equal
amounts. The Trustee shall be
 
                                      A-24
<PAGE>
reimbursed,  without interest, for any such  advances from funds in the Interest
Account  of  such  Trust.  The  Trustee's  fee  takes  into  account  the  costs
attributable to the outlay of capital needed to make such advances.
 
    The  Trustee  shall withdraw  from the  Interest  Account and  the Principal
Account of a  Trust such amounts  as may  be necessary to  cover redemptions  of
Units of such Trust by the Trustee. (See Section 19.)
 
    Funds  which are available for future distributions, redemptions and payment
of expenses are held in accounts  which are non-interest bearing to  Unitholders
and are available for use by the Trustee pursuant to normal banking procedures.
 
14.  ACCUMULATION PLAN
 
The  Sponsor, John Nuveen & Co.  Incorporated, is also the principal underwriter
of the  Nuveen Municipal  Bond Fund,  Inc. (the  "Bond Fund"),  Nuveen  Tax-Free
Reserves, Inc. ("Tax-Free Reserves"), Nuveen California Tax-Free Fund, Inc. (the
"California  Fund"),  Nuveen Tax-Free  Bond Fund,  Inc. ("Tax-Free  Bond Fund"),
Nuveen Insured Tax-Free  Bond Fund, Inc.  (the "Insured Bond  Fund") and  Nuveen
Tax-Free  Money  Market Fund,  Inc.  (the "Money  Market  Fund") and  the Nuveen
Multistate  Tax-Free  Trust  (the  "Multistate  Trust").  Each  of  these  funds
(together,  the  "Accumulation Funds")  is  an open-end,  diversified management
investment  company  into  which  Unitholders  may  choose  to  reinvest   Trust
distributions  automatically,  without any  sales  charge. (Reinvestment  in the
California Fund is available only  to Unitholders who are California  residents.
Reinvestment in the State Portfolios of the Tax-Free Bond Fund, the Insured Bond
Fund,  the  Money Market  Fund and  the  Multistate Trust  is available  only to
Unitholders who  are residents  of  the states  for  which such  portfolios  are
named.)  Unitholders may reinvest  both interest and  principal distributions or
principal distributions only. Each  Accumulation Fund has investment  objectives
which  differ in  certain respects from  those of  the Trusts and  may invest in
securities which would not be eligible for deposit in the Trusts. The investment
adviser to  each Accumulation  Fund  is Nuveen  Advisory Corp.,  a  wholly-owned
subsidiary  of  the  Sponsor. The  following  is  a general  description  of the
investment objectives  and  policies  of  each Accumulation  Fund.  For  a  more
detailed description, Unitholders should read the prospectus of the Accumulation
Fund in which they are interested.
 
THE BOND FUND
 
    The  Bond  Fund has  the  objective of  providing,  through investment  in a
professionally managed portfolio of long-term  municipal bonds, as high a  level
of  current interest income exempt from Federal income tax as is consistent with
preservation of capital. The Bond Fund  may include in its portfolio  tax-exempt
bonds  rated Baa or BBB or better by Moody's or Standard & Poor's, unrated bonds
which, in the  opinion of  the investment adviser,  have credit  characteristics
equivalent  to  bonds  rated  Baa  or  BBB  or  better,  and  certain  temporary
investments, including securities the interest income from which may be  subject
to Federal income tax.
 
TAX-FREE RESERVES
 
    Tax-Free  Reserves is a  "money market" fund that  includes in its portfolio
only obligations  maturing  within  one  year  from  the  date  of  acquisition,
maintains an average maturity of all investments of 120 days or less, values its
portfolio at amortized cost and seeks to maintain a net asset value of $1.00 per
share. It provides checkwriting and expedited wire redemption privileges for its
shareholders.   Tax-Free  Reserves  has  the  objective  of  providing,  through
investment in  a professionally  managed portfolio  of high  quality  short-term
municipal  obligations, as high  a level of current  interest income exempt from
Federal income  tax  as is  consistent  with  preservation of  capital  and  the
maintenance of liquidity. Tax-Free
 
                                      A-25
<PAGE>
Reserves  may  include in  its portfolio  municipal  obligations rated  Aaa, Aa,
MIG-1, VMIG-1  or Prime-1  by Moody's  or AAA,  AA, SP-1  or A-1  by Standard  &
Poor's,  unrated municipal  obligations that, in  the opinion  of the investment
adviser, have credit characteristics equivalent  to obligations rated as  above,
tax-exempt  obligations backed by the U.S. Government, and temporary investments
that may be subject to Federal income tax.
 
THE CALIFORNIA FUND
 
    The California Fund has  the objective of  providing, through investment  in
professionally managed portfolios of California municipal obligations, as high a
level  of current interest income exempt from both Federal and California income
taxes as is consistent with the investment policies of each of the portfolios of
the California Fund  and with  preservation of  capital. Each  portfolio of  the
California  Fund may include  temporary investments that may  be subject to tax.
California Unitholders may reinvest in one of three portfolios of the California
Fund: The Nuveen California Tax-Free  Value Fund, the Nuveen California  Insured
Tax-Free Value Fund and the Nuveen California Tax-Free Money Market Fund.
 
    The  Nuveen California  Tax-Free Value  Fund invests  primarily in long-term
investment grade  California tax-exempt  bonds (I.E.,  bonds rated  in the  four
highest  categories by Moody's  or Standard &  Poor's or, if  unrated, that have
equivalent credit characteristics). The Nuveen California Insured Tax-Free Value
Fund invests  primarily in  the same  type of  investments as  the Special  Bond
Portfolio, each of which is covered by insurance guaranteeing the timely payment
of  principal  and  interest  or  is backed  by  a  deposit  of  U.S. Government
securities.
 
    The Nuveen  California  Tax-Free  Money Market  Fund  invests  primarily  in
high-quality  short term  California tax-exempt money  market instruments (I.E.,
obligations rated in the two highest categories by Moody's or Standard &  Poor's
or,  if unrated,  that have  equivalent credit  characteristics). This portfolio
will include  only  obligations  maturing  within one  year  from  the  date  of
acquisition, will maintain an average maturity of all investments of 120 days or
less, will value its portfolio at amortized cost and will seek to maintain a net
asset value of $1.00 per share. The Nuveen California Tax-Free Money Market Fund
provides for an expedited wire redemption privilege.
 
THE TAX-FREE BOND FUND
 
    The  Tax-Free Bond Fund consists of  the Nuveen Massachusetts Tax-Free Value
Fund, the Nuveen New  York Tax-Free Value Fund,  the Nuveen Ohio Tax-Free  Value
Fund,  and the Nuveen New  Jersey Tax-Free Value Fund,  which are each available
for reinvestment to Unitholders  who are residents of  the state for which  such
portfolio  is  named. The  Tax-Free Bond  Fund has  the objective  of providing,
through investment in a professionally managed portfolio of municipal bonds,  as
high  a level of current interest income exempt both from Federal income tax and
from the  income  tax  imposed  by  each  portfolio's  designated  state  as  is
consistent  with preservation of capital. The  Tax-Free Bond Fund may include in
each of its  portfolios tax-exempt  bonds rated Baa  or BBB  or better;  unrated
bonds   which,  in   the  opinion  of   the  investment   adviser,  have  credit
characteristics equivalent to  bonds rated  Baa or  BBB or  better; and  certain
temporary  investments, including securities the  interest income from which may
be subject to Federal and state income tax.
 
THE INSURED BOND FUND
 
    The Insured Bond Fund  consists of the Nuveen  Insured Municipal Bond  Fund,
the  Nuveen Massachusetts  Insured Tax-Free Value  Fund and the  Nuveen New York
Insured Tax-Free  Value  Fund, which  are  each available  for  reinvestment  to
Unitholders.  (The Massachusetts and  New York Portfolios  are available only to
those Unitholders who are residents of the
 
                                      A-26
<PAGE>
state for which the portfolio is named.) The Insured Bond Fund has the objective
of  providing,  through  investment  in  professionally  managed  portfolios  of
municipal  bonds, as high  a level of  current interest income  exempt from both
Federal income tax  and, in the  case of designated  state portfolios, from  the
income  tax imposed by each portfolio's  designated state, as is consistent with
preservation of  capital. The  Insured Bond  Fund  may include  in each  of  its
portfolios the same type of investments as the Tax-Free Bond Fund, each of which
is  covered  by  insurance  guaranteeing the  timely  payment  of  principal and
interest or is backed by a deposit of U.S. Government securities.
 
THE MONEY MARKET FUND
 
    The Money Market Fund  consists of the  Nuveen Massachusetts Tax-Free  Money
Market  Fund and the Nuveen New York  Tax-Free Money Market Fund, which are each
available for reinvestment  to Unitholders who  are residents of  the state  for
which  such portfolio is named. The Money Market Fund includes in its portfolios
only obligations  maturing  within  one  year  from  the  date  of  acquisition,
maintains  an average  maturity of  120 days or  less, values  its portfolios at
amortized cost and seeks to maintain a  net asset value of $1.00 per share.  The
Money  Market  Fund  has  the  objective  of  providing,  through  investment in
professionally  managed  portfolios   of  high   quality  short-term   municipal
obligations, as high a level of current interest income exempt both from Federal
income  tax and from the income tax imposed by each portfolio's designated state
as is consistent with stability of  principal and the maintenance of  liquidity.
The  Money  Market  Fund  may  include  in  each  of  its  portfolios  municipal
obligations rated Aaa, Aa, MIG-1, MIG-2, VMIG-1,  VMIG-2, Prime 1 or Prime 2  by
Moody's  or  AAA, AA,  SP-1,  SP-2, A-1  or A-2  by  Standard &  Poor's; unrated
municipal obligations  that, in  the  opinion of  the investment  adviser,  have
credit  characteristics equivalent to obligations  rated as above; and temporary
investments that may be subject to Federal and state income tax.
 
THE MULTISTATE TRUST
 
    The Multistate Trust consists of the Nuveen Arizona Tax-Free Value Fund, the
Nuveen Florida Tax-Free Value Fund, the Nuveen Maryland Tax-Free Value Fund, the
Nuveen Michigan Tax-Free Value Fund, the Nuveen New Jersey Tax-Free Value  Fund,
the  Nuveen Pennsylvania  Tax-Free Value Fund  and the Nuveen  Virginia Tax Free
Value Fund, which  are each available  for reinvestment to  Unitholders who  are
residents  of the state for which such  portfolio is named. The Multistate Trust
has the objective of providing,  through investment in a professionally  managed
portfolio  of municipal bonds, as high a level of current interest income exempt
from both regular Federal  income tax and the  applicable state personal  income
tax  as is  consistent with  preservation of  capital. The  Multistate Trust may
include in  each of  its portfolios  tax-exempt bonds  rated "Baa"  or "BBB"  or
better,  unrated bonds  which, in  the opinion  of the  investment advisor, have
credit characteristics  equivalent to  bonds  rated "baa"  or "BBB"  or  better,
limited  to  no more  than 20%  of  the Multistate  Trust's assets,  and certain
temporary investments that may be subject to Federal and state income tax.
 
    Each person who purchases Units of a  Trust may become a participant in  the
Accumulation  Plan and elect  to have his  or her distributions  on Units of the
Trust invested directly in shares of one of the Accumulation Funds.  Reinvesting
Unitholders   may  select  any  interest  distribution  plan.  Thereafter,  each
distribution  of  interest  income  or  principal  on  the  participant's  Units
(principal  only in  the case of  a Unitholder  who has chosen  to reinvest only
principal distributions) will, on the applicable distribution date, or the  next
day  on which the New  York Stock Exchange is  normally open ("business day") if
the distribution  date is  not  a business  day,  automatically be  received  by
Shareholder  Services, Inc., transfer agent for  each of the Accumulation Funds,
on behalf of such participant  and applied on that  date to purchase shares  (or
fractions   thereof)   of   the   Accumulation   Fund   chosen   at   net  asset
 
                                      A-27
<PAGE>
value as  computed  as  of  4:00  p.m. eastern  time  on  each  such  date.  All
distributions  will be  reinvested in the  Accumulation Fund chosen  and no part
thereof will be  retained in a  separate account. These  purchases will be  made
without a sales charge.
 
    Shareholder Services, Inc. will mail to each participant in the Accumulation
Plan  a quarterly  statement containing a  record of  all transactions involving
purchases of Accumulation Fund shares (or fractions thereof) with Trust interest
distributions or as a result of reinvestment of Accumulation Fund dividends. Any
distribution of principal used to purchase  shares of an Accumulation Fund  will
be  separately  confirmed by  Shareholder Services,  Inc. Unitholders  will also
receive  distribution  statements  from   the  Trustee  detailing  the   amounts
transferred to their Accumulation Fund accounts.
 
    Participants  may at any time, by so notifying the Trustee in writing, elect
to change  the  Accumulation  Fund  into which  their  distributions  are  being
reinvested,  to change from principal only  reinvestment to reinvestment of both
principal and interest or vice versa, or to terminate their participation in the
Accumulation Plan altogether and receive future distributions on their Units  in
cash.  There will be no  charge or other penalty for  such change of election or
termination.
 
    The character of  Trust distributions  for income tax  purposes will  remain
unchanged even if they are reinvested in an Accumulation Fund.
 
15.  HOW DETAILED ARE REPORTS TO UNITHOLDERS?
 
The  Trustee  shall  furnish Unitholders  of  a  Trust in  connection  with each
distribution, a statement of the amount of  interest and, if any, the amount  of
other  receipts (received  since the preceding  distribution) being distributed,
expressed in each case  as a dollar  amount representing the  pro rata share  of
each Unit of a Trust outstanding and a year to date summary of all distributions
paid  on said Units.  Within a reasonable period  of time after  the end of each
calendar year, the Trustee shall furnish to  each person who at any time  during
the  calendar  year was  a registered  Unitholder  of a  Trust a  statement with
respect to  such  Trust  (i)  as to  the  Interest  Account:  interest  received
(including  amounts  representing  interest  received  upon  any  disposition of
Bonds), and, except  for any  State Trust, the  percentage of  such interest  by
states  in which the issuers  of the Bonds are  located, deductions for fees and
expenses of such Trust, redemption of Units and the balance remaining after such
distributions and deductions,  expressed in  each case  both as  a total  dollar
amount  and as  a dollar  amount representing  the pro  rata share  of each Unit
outstanding on the  last business  day of  such calendar  year; (ii)  as to  the
Principal  Account: the dates of  disposition of any Bonds  and the net proceeds
received therefrom (excluding  any portion representing  accrued interest),  the
amount  paid for purchase of Replacement  Bonds, the amount paid upon redemption
of Units, deductions for  payment of applicable taxes  and fees and expenses  of
the  Trustee, and the balance remaining  after such distributions and deductions
expressed both as a total dollar amount and as a dollar amount representing  the
pro  rata  share of  each  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.
 
                                      A-28
<PAGE>
16.  UNIT VALUE AND EVALUATION
 
The  value of each  Trust is determined by  the Sponsor on the  basis of (1) the
cash on hand in the Trust or moneys  in the process of being collected, (2)  the
value  of the Bonds in  the Trust based on  the BID prices of  the Bonds and (3)
interest  accrued  thereon   not  subject  to   collection,  LESS  (1)   amounts
representing  taxes or governmental charges payable out of the Trust and (2) the
accrued expenses of the Trust. The result of such computation is divided by  the
number  of Units of such  Trust outstanding as of  the date thereof to determine
the per Unit value ("Unit Value") of  such Trust. The Sponsor may determine  the
value  of the Bonds in each Trust (1) on  the basis of current BID prices of the
Bonds obtained from dealers or brokers who customarily deal in bonds  comparable
to  those held by the Trust, (2) if bid  prices are not available for any of the
Bonds, on the basis of bid prices for comparable bonds, (3) by causing the value
of the Bonds to be determined by  others engaged in the practice of  evaluating,
quoting  or appraising comparable bonds or (4)  by any combination of the above.
Although the Unit Value of each Trust is  based on the BID prices of the  Bonds,
the Units are sold initially to the public at the Public Offering Price based on
the OFFERING prices of the Bonds.
 
    Because  the insurance obtained  by the Sponsor  or by the  issuers of Bonds
with respect to  the Bonds in  the Insured  Trusts and with  respect to  insured
Bonds  in Traditional Trusts is effective so long as such Bonds are outstanding,
such insurance will be  taken into account in  determining the bid and  offering
prices  of such  Bonds and therefore  some value attributable  to such insurance
will be included in the value of Units of Trusts that include such Bonds.
 
17.  HOW UNITS OF THE TRUSTS ARE DISTRIBUTED TO THE PUBLIC
 
John Nuveen & Co. Incorporated is the Sponsor and sole Underwriter of the Units.
It is  the  intention  of  the  Sponsor  to  qualify  Units  of  National,  Long
Intermediate,  Intermediate, Short Intermediate  and Short Term  Trusts for sale
under the laws of  substantially all of  the states, and  Units of State  Trusts
only in the state for which the Trust is named and selected other states.
 
    Promptly following the deposit of Bonds in exchange for Units of the Trusts,
it  is the practice of the Sponsor to place all of the Units as collateral for a
letter or letters of credit from one or more commercial banks under an agreement
to release such Units from time to  time as needed for distribution. Under  such
an  arrangement  the Sponsor  pays  such banks  compensation  based on  the then
current interest  rate. This  is  a normal  warehousing arrangement  during  the
period of distribution of the Units to public investors.
 
    The  Sponsor plans to allow a discount  to brokers and dealers in connection
with  the  primary  distribution   of  Units  and   also  in  secondary   market
transactions. The primary market discounts are as follows:
 
<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.
 
                                      A-29
<PAGE>
    The Sponsor currently intends  to maintain a secondary  market for Units  of
each  Trust. See  Section 7.  The amount of  the dealer  concession on secondary
market purchases of Trust Units through the Sponsor will be computed based  upon
the  value  of the  Bonds in  the  Trust portfolio,  including the  sales charge
computed as described in Section 6, and adjusted to reflect the cash position of
the Trust principal  account, and will  vary with  the size of  the purchase  as
shown in the following table:
 
<TABLE>
<CAPTION>
                                                               AMOUNT OF PURCHASE*
                            -----------------------------------------------------------------------------------------
<S>                         <C>        <C>        <C>        <C>        <C>        <C>         <C>         <C>
                                        $50,000   $100,000   $250,000   $500,000   $1,000,000  $2,500,000
                              UNDER       TO         TO         TO         TO          TO          TO      $5,000,000
YEARS TO MATURITY            $50,000    $99,999   $249,999   $499,999   $999,999   $2,499,999  $4,999,999   OR MORE
- --------------------------  ---------  ---------  ---------  ---------  ---------  ----------  ----------  ----------
Less than 1...............      0          0          0          0          0          0           0           0
1 but less than 2.........    1.00%      .90%       .85%       .80%       .70%        .55%       .467%       .389%
2 but less than 3.........    1.30%      1.20%      1.10%      1.00%      .90%        .73%       .634%       .538%
3 but less than 4.........    1.60%      1.45%      1.35%      1.25%      1.10%       .90%       .781%       .662%
4 but less than 5.........    2.00%      1.85%      1.75%      1.55%      1.40%      1.25%       1.082%      .914%
5 but less than 7.........    2.30%      2.15%      1.95%      1.80%      1.65%      1.50%       1.320%      1.140%
7 but less than 10........    2.60%      2.45%      2.25%      2.10%      1.95%      1.70%       1.496%      1.292%
10 but less than 13.......    3.00%      2.80%      2.60%      2.45%      2.30%      2.00%       1.747%      1.494%
13 but less than 16.......    3.25%      3.15%      3.00%      2.75%      2.50%      2.15%       1.878%      1.606%
16 or more................    3.50%      3.50%      3.40%      3.35%      3.00%      2.50%       2.185%      1.873%
</TABLE>
 
 *Breakpoint sales charges and related dealer concessions are computed both on a
  dollar  basis and  on the basis  of the  number of Units  purchased, using the
  equivalent of 500 Units to $50,000, 2,500 Units to $250,000, etc., and will be
  applied on that basis which is more favorable to the purchaser.
 
    The Sponsor reserves the  right to change  the foregoing dealer  concessions
from time to time.
 
    Registered  investment advisers, certified financial planners and registered
broker-dealers who  in  each case  either  charge periodic  fees  for  financial
planning,  investment  advisory or  asset management  services, or  provide such
services in connection with the establishment of an investment account for which
a comprehensive  "wrap  fee"  charge  is imposed,  and  bank  trust  departments
investing  funds  over which  they  exercise exclusive  discretionary investment
authority and  that  are held  in  a  fiduciary, agency,  custodial  or  similar
capacity,  are  not entitled  to receive  any dealer  concession for  primary or
secondary market purchases in which an investor purchases any number of Units at
the Public Offering Price for non-breakpoint purchases minus the concession  the
sponsor  typically allows  to brokers  and dealers  for non-breakpoint purchases
(see Section 6).
 
    Certain commercial banks are making Units  of the Trusts available to  their
customers  on  an agency  basis. A  portion of  the sales  charge paid  by these
customers is retained by or  remitted to the banks in  the amounts shown in  the
above  table.  The Glass-Steagall  Act prohibits  banks from  underwriting Trust
Units; the Act  does, however,  permit certain agency  transactions and  banking
regulators  have not indicated that these particular agency transactions are not
permitted under the Act. In Texas and  in certain other states, any bank  making
Units available must be registered as a broker-dealer under state law.
 
    To  facilitate the handling of transactions, sales of Units shall be limited
to transactions involving a minimum of  either $5,000 or 50 Units, whichever  is
less.  The Sponsor reserves the right to reject,  in whole or in part, any order
for the purchase of Units.
 
18.  OWNERSHIP AND TRANSFER OF UNITS
 
The ownership of  Units is  evidenced by book  entry positions  recorded on  the
books  and records of the Trustee  unless the Unitholder expressly requests that
the purchased Units be evidenced in Certificate form. The Trustee is  authorized
to treat as the owner of Units that person who at the time is registered as such
on  the books of the Trustee. Any  Unitholder who holds a Certificate may change
to   book    entry    ownership   by    submitting    to   the    Trustee    the
 
                                      A-30
<PAGE>
Certificate  along with  a written  request that  the Units  represented by such
Certificate be held in book entry  form. Likewise, a Unitholder who holds  Units
in book entry form may obtain a Certificate for such Units by written request to
the  Trustee. Units may be held in denominations  of one Unit or any multiple or
fraction thereof. Fractions of Units are  computed to three decimal places.  Any
Certificates issued will be numbered serially for identification, and are issued
in  fully registered form, transferable  only on the books  of the Trustee. Book
entry Unitholders will  receive a  Book Entry  Position Confirmation  reflecting
their ownership.
 
    Certificates  for  Units will  bear an  appropriate  notation on  their face
indicating which plan of distribution has been selected. When a change is  made,
the   existing  Certificates  must  be  surrendered   to  the  Trustee  and  new
Certificates issued to  reflect the  currently effective  plan of  distribution.
There will be no charge for this service. Holders of book entry Units can change
their  plan of distribution  by making a  written request to  the Trustee, which
will issue a new Book Entry Position Confirmation to reflect such change.
 
    Units are transferable by  making a written request  to the Trustee and,  in
the  case of Units  evidenced by Certificate(s),  by presenting and surrendering
such Certificate(s) to the  Trustee, at its corporate  trust office in New  York
City, properly endorsed or accompanied by a written instrument or instruments of
transfer. The Certificate(s) should be sent registered or certified mail for the
protection  of the Unitholder.  Each Unitholder must  sign such written request,
and such Certificate(s) or transfer instrument,  exactly as his name appears  on
(a)  the face of the Certificate(s) representing the Units to be transferred, or
(b) the  Book  Entry  Position  Confirmation(s) relating  to  the  Units  to  be
transferred.  Such signature(s) must be guaranteed  by a guarantor acceptable to
the Trustee. In certain instances  the Trustee may require additional  documents
such  as,  but  not  limited  to,  trust  instruments,  certificates  of  death,
appointments  as  executor  or   administrator  or  certificates  of   corporate
authority.  Mutilated Certificates must  be surrendered to  the Trustee in order
for a replacement Certificate to be issued.
 
    Although at the date hereof  no charge is made  and none is contemplated,  a
Unitholder  may be  required to  pay $2.00 to  the Trustee  for each Certificate
reissued or transfer of Units requested and to pay any governmental charge which
may be imposed in connection therewith.
 
REPLACEMENT OF LOST, STOLEN OR DESTROYED CERTIFICATES.
 
    To obtain a  new Certificate replacing  one that has  been lost, stolen,  or
destroyed,   the   Unitholder   must  furnish   the   Trustee   with  sufficient
indemnification and pay such expenses as the Trustee may incur.
 
    The indemnification protects the  Trustee, Sponsor, and  Trust from risk  if
the original Certificate is presented for transfer or redemption by a person who
purchased  it  in good  faith,  for value  and without  notice  of any  fraud or
irregularity.
 
    This indemnification  must  be  in the  form  of  an Open  Penalty  Bond  of
Indemnification.  The premium for such  an indemnity bond may  vary from time to
time, but currently amounts to 1% of  the market value of the Units  represented
by  the Certificate.  In the  case however,  of a  Trust as  to which  notice of
termination has been given, the premium currently amounts to 0.5% of the  market
value of the Units represented by such Certificate.
 
19.  HOW UNITS MAY BE REDEEMED WITHOUT CHARGE
 
Unitholders  may redeem all or a portion of  their Units by (1) making a written
request for such redemption (book entry Unitholders may use the redemption  form
on the reverse side of their Book Entry Position Confirmation) to the Trustee at
its  corporate trust office in New York City (redemptions of 1,000 Units or more
will require a signature guarantee), (2) in the
 
                                      A-31
<PAGE>
case of Units evidenced by a Certificate, by also tendering such Certificate  to
the Trustee, duly endorsed or accompanied by proper instruments of transfer with
signatures  guaranteed  as explained  in Section  18 above,  and (3)  payment of
applicable governmental charges,  if any.  Certificates should be  sent only  by
registered  or certified mail to minimize the possibility of their being lost or
stolen. In order to effect a redemption  of Units evidenced by a Certificate,  a
Unitholder  must tender the  Certificate to the  Trustee or provide satisfactory
indemnity required in  connection with  lost, stolen  or destroyed  Certificates
(See  Section 18). No redemption fee will be charged. A Unitholder may authorize
the Trustee to honor telephone instructions for the redemption of Units held  in
book  entry  form. Units  represented  by Certificates  may  not be  redeemed by
telephone. The proceeds  of Units redeemed  by telephone will  be sent by  check
either  to  the Unitholder  at  the address  specified on  his  account or  to a
financial institution specified by the Unitholder  for credit to the account  of
the  Unitholder.  A Unitholder  wishing to  use this  method of  redemption must
complete a Telephone Redemption Authorization Form  and furnish the Form to  the
Trustee.  Telephone  Redemption  Authorization  Forms  can  be  obtained  from a
Unitholder's registered  representative  or by  calling  the Trustee.  Once  the
completed  Form is on file, the Trustee will honor telephone redemption requests
by any person.  If the telephone  redemption request is  received prior to  4:00
p.m.  eastern time,  the Unitholder  will be entitled  to receive  for each Unit
tendered the  Redemption  Price  as determined  above.  A  telephone  redemption
request  received after 4:00  p.m. eastern time  will be treated  as having been
received the  following business  day. The  redemption proceeds  will be  mailed
within seven calendar days following the telephone redemption request. Telephone
redemptions  are limited to 1,000 Units or less.  Only Units held in the name of
individuals may be redeemed by telephone; accounts registered in broker name, or
accounts of  corporations  or  fiduciaries (including  among  others,  trustees,
guardians,  executors and administrators)  may not use  the telephone redemption
privilege.
 
    On the seventh calendar day following the date of tender, or if the  seventh
calendar day is not a business day, on the first business day prior thereto, the
Unitholder  will be entitled to receive in cash for each Unit tendered an amount
equal to the Unit Value of such Trust determined by the Trustee, as of 4:00 p.m.
eastern time on the date of  tender as defined hereafter, plus accrued  interest
to,  but  not  including,  the  fifth business  day  after  the  date  of tender
("Redemption Price"). The  price received upon  redemption may be  more or  less
than  the amount paid by  the Unitholder depending on the  value of the Bonds on
the date of  tender. Such  value will vary  with market  and credit  conditions,
including  changes in  interest rate levels.  Unitholders should  check with the
Trustee or  their broker  to  determine the  Redemption Price  before  tendering
Units.
 
    While the Trustee has the power to determine Redemption Price when Units are
tendered,  the authority has by  practice been delegated by  the Trustee to John
Nuveen & Co.  Incorporated, which  determines the  Redemption Price  on a  daily
basis.
 
    The  "date of  tender" is  deemed to be  the date  on which  the request for
redemption of Units is received  in proper form by  the Trustee, except that  as
regards a redemption request received after 4:00 p.m. eastern time or on any day
on  which the New York  Stock Exchange (the "Exchange")  is normally closed, the
date of tender  is the  next day  on which such  Exchange is  normally open  for
trading  and such request will be  deemed to have been made  on such day and the
redemption will be effected at the Redemption Price computed on that day.
 
    Accrued interest paid  on redemption  shall be withdrawn  from the  Interest
Account  of the  appropriate Trust or,  if the balance  therein is insufficient,
from the Principal Account of such  Trust. All other amounts paid on  redemption
shall  be withdrawn from the Principal Account. The Trustee is empowered to sell
underlying Bonds of  a Trust in  order to make  funds available for  redemption.
(See Section 21.) Units so redeemed shall be cancelled.
 
                                      A-32
<PAGE>
    To  the extent that Bonds  are sold from a Trust,  the size and diversity of
such Trust will  be reduced. Such  sales may be  required at a  time when  Bonds
would  not  otherwise  be sold  and  might  result in  lower  prices  than might
otherwise be realized.
 
    The Redemption Price is  determined on the  basis of the  BID prices of  the
Bonds  in each Trust, while  the initial Public Offering  Price of Units will be
determined on the  basis of the  OFFERING prices of  the Bonds as  of 4:00  p.m.
eastern  time on any day on which the  Exchange is normally open for trading and
such determination is made. As of any given time, the difference between the bid
and offering  prices of  such Bonds  may  be expected  to average  1% to  2%  of
principal  amount in the case of Bonds  in National, Long Intermediate and State
Trusts, 3/4%  to  1  1/2% in  the  case  of Bonds  in  Intermediate,  and  Short
Intermediate  Trusts and 1/2% to 3/4% in the case of Bonds in Short Term Trusts.
In the case of actively traded Bonds, the difference may be as little as 1/4  to
1/2  of 1%, and in  the case of inactively  traded Bonds such difference usually
will not exceed 3%. The difference between the aggregate offering prices of  the
Bonds  in each Trust  and the aggregate  bid prices thereof  on the business day
prior to  the Date  of Deposit  is shown  in the  discussion of  specific  trust
matters.
 
    The  right  of redemption  may be  suspended and  payment postponed  for any
period during  which  the Securities  and  Exchange Commission  determines  that
trading  in the municipal bond market is restricted or an emergency exists, as a
result  of  which  disposal  or  evaluation  of  the  Bonds  is  not  reasonably
practicable, or for such other periods as the Securities and Exchange Commission
may by order permit.
 
    Under  regulations issued by the Internal  Revenue Service, the Trustee will
be required to withhold 31% of the principal amount of a Unit redemption if  the
Trustee  has not  been furnished  the redeeming  Unitholder's tax identification
number in the  manner required by  such regulations. Any  amount so withheld  is
transmitted  to  the  Internal  Revenue  Service and  may  be  recovered  by the
Unitholder only when filing  his or her tax  return. Under normal  circumstances
the  Trustee obtains the Unitholder's tax identification number from the selling
broker at the time the Certificate or Book Entry Return Confirmation is  issued,
and  this number is printed on the Certificate or Book Entry Return Confirmation
and on distribution statements. If a Unitholder's tax identification number does
not appear as  described above,  or if it  is incorrect,  the Unitholder  should
contact  the Trustee before redeeming Units to determine what action, if any, is
required to avoid this "back-up withholding."
 
20.  HOW UNITS MAY BE PURCHASED BY THE SPONSOR
 
The Trustee will notify the  Sponsor of any tender  of Units for redemption.  If
the  Sponsor's bid in  the secondary market  at that time  equals or exceeds the
Redemption Price it may purchase such Units by notifying the Trustee before  the
close  of business on the  second succeeding business day  and by making payment
therefor to  the  Unitholder not  later  than the  day  on which  payment  would
otherwise have been made by the Trustee. (See Section 19.) The Sponsor's current
practice  is to bid at the Redemption  Price in the secondary market. Units held
by the Sponsor may be tendered to the Trustee for redemption as any other Units.
 
    The Public Offering  Price upon  resale of any  Units thus  acquired by  the
Sponsor  will be  calculated in accordance  with the procedure  described in the
then currently effective prospectus relating to such Units. Any profit resulting
from the resale of  such Units will  belong to the  Sponsor which likewise  will
bear  any loss resulting from a lower  Public Offering Price or Redemption Price
subsequent to its acquisition of such Units.
 
                                      A-33
<PAGE>
21.  HOW BONDS MAY BE REMOVED FROM THE TRUSTS
 
Bonds will be removed from a Trust as they mature or are redeemed by the issuers
thereof. See  the "Schedules  of Investments"  and "General  Trust  Information"
under Section 3 for a discussion of call provisions of portfolio Bonds.
 
    The  Indenture also empowers  the Trustee to  sell Bonds for  the purpose of
redeeming Units tendered by any Unitholder, and for the payment of expenses  for
which  income may not be available. Under the Indenture the Sponsor is obligated
to provide the Trustee with a current list of Bonds in each Trust to be sold  in
such  circumstances. In deciding which Bonds  should be sold the Sponsor intends
to consider, among  other things, such  factors as: (1)  market conditions;  (2)
market  prices  of  the  Bonds;  (3)  the  effect  on  income  distributions  to
Unitholders of the sale of various Bonds; (4) the effect on principal amount  of
underlying  Bonds  per Unit  of the  sale  of various  Bonds; (5)  the financial
condition of the issuers; and (6) the effect of the sale of various Bonds on the
investment character of the Trust. Such sales, if required, could result in  the
sale  of Bonds by the Trustee at prices less than original cost to the Trust. To
the extent Bonds are sold, the size and diversity of such Trust will be reduced.
 
    In addition, the  Sponsor is empowered  to direct the  Trustee to  liquidate
Bonds upon the happening of certain other events, such as default in the payment
of principal and/or interest, an action of the issuer that will adversely affect
its  ability to continue payment of the  principal of and interest on its Bonds,
or an  adverse  change  in  market, revenue  or  credit  factors  affecting  the
investment  character of the Bonds. If a default in the payment of the principal
of and/or interest  on any  of the  Bonds occurs, and  if the  Sponsor fails  to
instruct  the Trustee whether to  sell or continue to  hold such Bonds within 30
days after  notification by  the Trustee  to the  Sponsor of  such default,  the
Indenture  provides that  the Trustee shall  liquidate said  Bonds forthwith and
shall not be liable for any loss so incurred.
 
    In connection with its  determination as to the  sale or liquidation of  any
Bonds,  the Sponsor  will consider the  Bond's then current  rating, but because
such ratings are the opinions of the rating agencies as to the quality of  Bonds
they  undertake to rate and not absolute  standards of quality, the Sponsor will
exercise its independent judgment as to Bond creditworthiness.
 
    The Sponsor may also direct the Trustee to liquidate Bonds in a Trust if the
Bonds in  the  Trust  are  the  subject  of  an  advanced  refunding,  generally
considered  to be when refunding  bonds are issued and  the proceeds thereof are
deposited in irrevocable trust to retire the refunded Bonds on their  redemption
date.
 
    Except as stated in Section 4 regarding the limited right of substitution of
Replacement Bonds for Failed Bonds, and except for refunding securities that may
be  exchanged for Bonds under certain conditions specified in the Indenture, the
Indenture does  not permit  either the  Sponsor  or the  Trustee to  acquire  or
deposit  bonds either in addition  to, or in substitution  for, any of the Bonds
initially deposited in a Trust.
 
22.  INFORMATION ABOUT THE TRUSTEE
 
The Trustee is United States Trust Company of New York, with its principal place
of business at 114 West 47th Street, New York, New York 10036 and its  corporate
trust  office at  770 Broadway,  New York, New  York 10003.  United States Trust
Company of New York, established in  1853, has, since its organization,  engaged
primarily  in the  management of trust  and agency accounts  for individuals and
corporations. The Trustee is a member of the New York Clearing House Association
and is subject to supervision and examination by the Superintendent of Banks  of
the  State of New York, the Federal  Deposit Insurance Corporation and the Board
of Governors of the Federal Reserve  System. In connection with the storage  and
handling  of certain  Bonds deposited  in the  Trusts, the  Trustee may  use the
services of The
 
                                      A-34
<PAGE>
Depository Trust Company. These services would include safekeeping of the  Bonds
and  coupon-clipping,  computer book-entry  transfer and  institutional delivery
services. The  Depository  Trust Company  is  a limited  purpose  trust  company
organized  under the  Banking Law  of the  State of  New York,  a member  of the
Federal Reserve System  and a  clearing agency registered  under the  Securities
Exchange Act of 1934.
 
LIMITATIONS ON LIABILITIES OF SPONSOR AND TRUSTEE
 
    The  Sponsor and the Trustee shall be  under no liability to Unitholders for
taking any action or for  refraining from any action  in good faith pursuant  to
the Indenture, or for errors in judgment, but shall be liable only for their own
negligence,  lack of good faith or willful  misconduct. The Trustee shall not be
liable for depreciation or loss incurred by reason of the sale by the Trustee of
any of the Bonds. In the  event of the failure of  the Sponsor to act under  the
Indenture, the Trustee may act thereunder and shall not be liable for any action
taken by it in good faith under the Indenture.
 
    The  Trustee shall not be liable for any taxes or other governmental charges
imposed upon or in respect of the Bonds or upon the interest thereon or upon  it
as  Trustee under  the Indenture or  upon or in  respect of any  Trust which the
Trustee may be required  to pay under  any present or future  law of the  United
States  of  America or  of any  other taxing  authority having  jurisdiction. In
addition,  the  Indenture  contains  other  customary  provisions  limiting  the
liability of the Trustee.
 
SUCCESSOR TRUSTEES AND SPONSORS
 
    The  Trustee or any successor trustee  may resign by executing an instrument
of resignation in writing and filing same with the Sponsor and mailing a copy of
a notice of resignation to all  Unitholders then of record. Upon receiving  such
notice,  the Sponsor is required to promptly appoint a successor trustee. If the
Trustee becomes incapable of acting or is adjudged a bankrupt or insolvent, or a
receiver or other public officer shall  take charge of its property or  affairs,
the  Sponsor  may  remove  the  Trustee  and  appoint  a  successor  by  written
instrument. The resignation  or removal of  a trustee and  the appointment of  a
successor trustee shall become effective only when the successor trustee accepts
its appointment as such. Any successor trustee shall be a corporation authorized
to  exercise  corporate  trust  powers, having  capital,  surplus  and undivided
profits of not less than $5,000,000. Any corporation into which a trustee may be
merged or with which it may  be consolidated, or any corporation resulting  from
any  merger or consolidation to  which a trustee shall be  a party, shall be the
successor trustee.
 
    If upon resignation  of a trustee  no successor has  been appointed and  has
accepted the appointment within 30 days after notification, the retiring trustee
may  apply  to  a court  of  competent  jurisdiction for  the  appointment  of a
successor.
 
    If the Sponsor fails to undertake any of its duties under the Indenture, and
no express  provision is  made for  action by  the Trustee  in such  event,  the
Trustee  may, in addition to its other  powers under the Indenture (1) appoint a
successor sponsor or (2) terminate the Indenture and liquidate the Trusts.
 
23.  INFORMATION ABOUT THE SPONSOR
 
John Nuveen & Co. Incorporated, the Sponsor and Underwriter, was founded in 1898
and is  the oldest  and  largest investment  banking  firm specializing  in  the
underwriting and distribution of tax-exempt securities and maintains the largest
research  department in the investment  banking community devoted exclusively to
the analysis of municipal securities. In  1961 the Sponsor began sponsoring  the
Nuveen  Tax-Exempt Unit Trust and, since this  time, it has issued more than $30
billion  in   tax-exempt   unit   trusts,   including   over   $8   billion   in
 
                                      A-35
<PAGE>
insured  trusts.  The  Sponsor  is  also  principal  underwriter  of  the Nuveen
Municipal Bond Fund, Inc., the Nuveen Tax-Exempt Money Market Fund, Inc., Nuveen
Tax-Free Reserves, Inc., Nuveen California Tax-Free Fund, Inc., Nuveen  Tax-Free
Bond  Fund, Inc.,  Nuveen Insured Tax-Free  Bond Fund, Inc.  and Nuveen Tax-Free
Money  Market  Fund,  Inc.,   all  registered  open-end  management   investment
companies,  and acted as co-managing underwriter of Nuveen Municipal Value Fund,
Inc., Nuveen California Municipal  Value Fund, Inc.,  Nuveen New York  Municipal
Value  Fund,  Inc.,  Nuveen  Municipal  Income  Fund,  Inc.,  Nuveen  California
Municipal Income Fund, Inc., Nuveen New York Municipal Income Fund, Inc., Nuveen
Premium Income Municipal  Fund, Inc.,  Nuveen Performance  Plus Municipal  Fund,
Inc.,  Nuveen California Performance Plus Municipal  Fund, Inc., Nuveen New York
Performance Plus Municipal  Fund, Inc., Nuveen  Municipal Advantage Fund,  Inc.,
Nuveen  Municipal  Market Opportunity  Fund,  Inc., Nuveen  California Municipal
Market Opportunity  Fund, Inc.,  Nuveen New  York Municipal  Market  Opportunity
Fund,  Inc., Nuveen Investment  Quality Municipal Fund,  Inc., Nuveen California
Investment Quality  Municipal Fund,  Inc., Nuveen  New York  Investment  Quality
Municipal  Fund,  Inc.,  Nuveen  Insured Quality  Municipal  Fund,  Inc., Nuveen
Florida  Investment  Quality  Municipal  Fund,  Nuveen  Pennsylvania  Investment
Quality  Municipal Fund,  Nuveen New  Jersey Investment  Quality Municipal Fund,
Inc., and  the Nuveen  Select Quality  Municipal Fund,  Inc., Nuveen  California
Quality  Municipal Fund,  Inc., Nuveen New  York Select  Quality Municipal Fund,
Inc., Nuveen  Quality  Income Municipal  Fund,  Inc., Nuveen  Insured  Municipal
Opportunity  Fund, Inc.,  Nuveen Florida  Quality Income  Municipal Fund, Nuveen
Michigan Quality Income Municipal Fund,  Inc., Nuveen New Jersey Quality  Income
Municipal  Fund, Inc., Nuveen  Ohio Quality Income  Municipal Fund, Inc., Nuveen
Pennsylvania  Quality  Income  Municipal  Fund,  Nuveen  Texas  Quality   Income
Municipal  Fund, Nuveen California  Quality Income Municipal  Fund, Inc., Nuveen
New York Quality Income Municipal  Fund, Inc., Nuveen Premier Insured  Municipal
Income  Fund, Inc., Nuveen  Select Tax Free Income  Portfolio, Nuveen Select Tax
Free Income  Portfolio  2,  Nuveen Insured  California  Select  Tax-Free  Income
Portfolio,  Nuveen  Insured New  York Select  Tax-Free Income  Portfolio, Nuveen
Premium Income Municipal Fund 2, Inc.,  Nuveen Select Tax Free Income  Portfolio
3,  Nuveen Select Maturities  Municipal Fund, Nuveen  Insured California Premium
Income Municipal Fund, Inc., Nuveen Arizona Premium Income Municipal Fund, Inc.,
Nuveen Insured  Premium  Income Municipal  Fund,  Inc., Nuveen  Insured  Florida
Premium  Income Municipal Fund,  Nuveen Michigan Premium  Income Municipal Fund,
Inc., Nuveen New Jersey Premium Income Municipal Fund, Inc., Nuveen Insured  New
York  Premium Income Municipal Fund, Inc.,  Nuveen Ohio Premium Income Municipal
Fund, Inc.,  Nuveen Pennsylvania  Premium Income  Municipal Fund,  Nuveen  Texas
Premium  Income Municipal  Fund, Nuveen Premium  Income Municipal  Fund 4, Inc.,
Nuveen Pennsylvania  Premium Income  Municipal Fund  2, Nuveen  Insured  Florida
Premium  Income Municipal Fund 2, Nuveen Maryland Premium Income Municipal Fund,
Nuveen Virginia  Premium Income  Municipal  Fund, Nuveen  Massachusetts  Premium
Income  Municipal Fund, Nuveen Insured  California Premium Income Municipal Fund
2, Inc., Nuveen  Insured New York  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
 
                                      A-36
<PAGE>
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.
 
24.  OTHER INFORMATION
AMENDMENT OF INDENTURE
 
    The Indenture may  be amended  by the Trustee  and the  Sponsor without  the
consent  of any of  the Unitholders (1) to  cure any ambiguity  or to correct or
supplement any provision thereof which may be defective or inconsistent, or  (2)
to  make such  other provisions as  shall not adversely  affect the Unitholders,
provided, however, that the Indenture may not be amended to increase the  number
of Units in any Trust or to permit the deposit or acquisition of bonds either in
addition  to, or in substitution for any of the Bonds initially deposited in any
Trust except as stated in Section 4 regarding the limited right of  substitution
of  Replacement Bonds and  except for the substitution  of refunding bonds under
certain circumstances. The Trustee shall advise the Unitholders of any amendment
promptly after execution thereof.
 
TERMINATION OF INDENTURE
 
    Each Trust may be liquidated at any  time by written consent of 100% of  the
Unitholders  or by  the Trustee when  the value of  such Trust, as  shown by any
evaluation, is less than 20% of the original principal amount of such Trust  and
will  be  liquidated  by  the Trustee  in  the  event that  Units  not  yet sold
aggregating more  than 60%  of the  Units originally  created are  tendered  for
redemption  by the Sponsor thereby reducing the  net worth of such Trust to less
than 40%  of the  principal amount  of  the Bonds  originally deposited  in  the
portfolio. (See "Essential Information Regarding the Trusts.") The sale of Bonds
from  the Trusts upon termination  may result in realization  of a lesser amount
than might otherwise be realized  if such sale were  not required at such  time.
For  this  reason,  among  others,  the amount  realized  by  a  Unitholder upon
termination  may  be  less  than  the  principal  amount  of  Bonds   originally
represented  by the Units held by  such Unitholder. The Indenture will terminate
upon the redemption, sale or other disposition of the last Bond held thereunder,
but in no event shall it continue beyond the end of the calendar year  preceding
the  fiftieth anniversary of its execution for National and State Trusts, beyond
the end  of  the  calendar  year preceding  the  twentieth  anniversary  of  its
execution  for Long Intermediate,  and Intermediate Trusts or  beyond the end of
the calendar year  preceding the tenth  anniversary of its  execution for  Short
Intermediate and Short Term Trusts.
 
    Written  notice of  any termination  specifying the  time or  times at which
Unitholders may surrender their Certificates, if any, for cancellation shall  be
given  by  the  Trustee to  each  Unitholder  at the  address  appearing  on the
registration books of the Trust maintained by the
 
                                      A-37
<PAGE>
Trustee. Within a  reasonable time  thereafter the Trustee  shall liquidate  any
Bonds  in the Trust then held and shall  deduct from the assets of the Trust any
accrued costs,  expenses or  indemnities  provided by  the Indenture  which  are
allocable  to such  Trust, including estimated  compensation of  the Trustee and
costs of  liquidation and  any amounts  required  as a  reserve to  provide  for
payment of any applicable taxes or other governmental charges. The Trustee shall
then distribute to Unitholders of such Trust their pro rata share of the balance
of  the Interest and Principal Accounts.  With such distribution the Unitholders
shall be furnished  a final  distribution statement, in  substantially the  same
form  as the annual distribution statement, of the amount distributable. At such
time as the Trustee in its sole discretion shall determine that any amounts held
in reserve  are no  longer  necessary, it  shall  make distribution  thereof  to
Unitholders in the same manner.
 
LEGAL OPINION
 
    The legality of the Units offered hereby has been passed upon by Chapman and
Cutler, 111 West Monroe Street, Chicago, Illinois 60603. Special counsel for the
Trusts for respective state tax matters are named in "Tax Status" for each Trust
under  Section 3. Carter, Ledyard  & Milburn, 2 Wall  Street, New York, New York
10005, has acted as counsel for the Trustee with respect to the Series, and,  in
the absence of a New York Trust from the Series, as special New York tax counsel
for the Series.
 
AUDITORS
 
    The  Statements of Condition and Schedules of Investments at Date of Deposit
included  in  this  Prospectus  have  been  audited  by  Arthur  Andersen   LLP,
independent public accountants, as indicated in their report in this Prospectus,
and  are included herein in reliance upon  the authority of said firm as experts
in giving said report.
 
                                      A-38
<PAGE>
                            DESCRIPTION OF RATINGS*
 
    STANDARD & POOR'S CORPORATION.  A  description of the applicable Standard  &
Poor's Corporation rating symbols and their meanings follows:
 
    A  Standard & Poor's rating is  a current assessment of the creditworthiness
of an obligor with  respect to a specific  debt obligation. This assessment  may
take into consideration obligors such as guarantors, insurers or lessees.
 
    The  rating is not  a recommendation to  purchase, sell or  hold a security,
inasmuch as  it  does not  comment  as to  market  price or  suitability  for  a
particular investor.
 
    The  ratings are  based on  current information  furnished by  the issuer or
obtained by Standard & Poor's from other sources it considers reliable. Standard
& Poor's does not  perform an audit  in connection with any  rating and may,  on
occasion,  rely on unaudited financial information.  The ratings may be changed,
suspended or withdrawn  as a result  of changes in,  or unavailability of,  such
information, or for other circumstances.
 
    The ratings are based, in varying degrees, on the following considerations:
 
     I.  Likelihood  of default--capacity and  willingness of the  obligor as to
         the timely payment of interest and repayment of principal in accordance
         with the terms of the obligation;
 
     II.  Nature of and provisions of the obligation;
 
    III.  Protection afforded by,  and relative position  of, the obligation  in
          the  event of  bankruptcy, reorganization or  other arrangements under
          the laws of bankruptcy and other laws affecting creditors' rights.
 
    AAA--This is the  highest rating  assigned by Standard  & Poor's  to a  debt
obligation. Capacity to pay interest and repay principal is extremely strong.
 
    AA--Bonds  rated AA have  a very strong  capacity to pay  interest and repay
principal, and differ from the highest rated issues only in small degree.
 
    A--Bonds rated A have a strong capacity to pay interest and repay principal,
although they are somewhat more susceptible to the adverse effects of changes in
circumstances and economic conditions than bonds in higher rated categories.
 
    BBB--Bonds rated BBB  are regarded  as having  an adequate  capacity to  pay
interest  and repay principal. Whereas they normally exhibit adequate protection
parameters, adverse  economic  conditions  or changing  circumstances  are  more
likely  to lead to a  weakened capacity to pay  interest and repay principal for
bonds in this category than for bonds in the higher rated categories.
 
    PLUS (+) OR MINUS (-): The ratings from "AA" to "BB" may be modified by  the
addition  of a  plus or minus  sign to  show relative standing  within the major
rating categories.
 
    PROVISIONAL  RATINGS:  The   letter  "p"  indicates   that  the  rating   is
provisional.  A  provisional rating  assumes  the successful  completion  of the
project being financed by  the issuance of the  bonds being rated and  indicates
that  payment of debt service requirements is largely or entirely dependent upon
the successful and timely completion of the project. This rating, however, while
addressing credit  quality subsequent  to completion  of the  project, makes  no
comment  on the  likelihood of,  or the  risk of  default upon  failure of, such
completion. Accordingly,  the investor  should exercise  his own  judgment  with
respect to such likelihood and risk.
 
- ----------
*As published by the rating companies.
 
                                      A-39
<PAGE>
    NOTE  RATINGS:  A  Standard  & Poor's  note  rating  reflects  the liquidity
concerns and market access risks unique to  notes. Notes due in 3 years or  less
will  likely receive  a note  rating. Notes  maturing beyond  3 years  will most
likely receive a long-term debt rating.
 
    Note rating symbols are as follows:
 
        SP-1  Very strong  or strong  capacity to  pay principal  and  interest.
              Those   issues   determined   to   possess   overwhelming   safety
              characteristics will be given a plus (+) designation.
 
        SP-2  Satisfactory capacity to pay principal and interest.
 
RATINGS OF INSURED TRUST UNITS.
 
    A Standard  &  Poor's  Corporation's  rating on  the  units  of  an  insured
investment  trust (hereinafter referred to collectively as "units" and "trusts")
is a current assessment of creditworthiness with respect to the investment  held
by  such trust. This assessment takes  into consideration the financial capacity
of the  issuers and  of any  guarantors, insurers,  lessees or  mortgagors  with
respect to such investments. The assessment, however, does not take into account
the  extent to which trust  expenses or portfolio asset  sales for less than the
trust purchase price will reduce payment  to the unitholder of the interest  and
principal  required to be paid on the  portfolio assets. In addition, the rating
is not a recommendation to purchase, sell or hold units, inasmuch as the  rating
does not comment as to market price of the units or suitability for a particular
investor.
 
    Units rated "AAA" are composed exclusively of assets that are rated "AAA" by
Standard  &  Poor's and/or  certain  short-term investments.  Standard  & Poor's
defines its  AAA  rating for  such  assets as  the  highest rating  assigned  by
Standard  & Poor's  to a  debt obligation.  Capacity to  pay interest  and repay
principal is very strong.  However, unit ratings may  be subject to revision  or
withdrawal  at any time by Standard & Poor's and each rating should be evaluated
independently of any other rating.
 
    MOODY'S INVESTORS  SERVICE, INC.    A brief  description of  the  applicable
Moody's Investors Service, Inc. rating symbols and their meanings follows:
 
    Aaa--Bonds which are rated Aaa are judged to be the best quality. They carry
the  smallest degree of investment  risk and are generally  referred to as "gilt
edge." Interest payments are protected by a large or by an exceptionally  stable
margin and principal is secure. While the various protective elements are likely
to  change, such changes  as can be  visualized are most  unlikely to impair the
fundamentally strong position of such issues. Their safety is so absolute  that,
with  the  occasional  exception  of oversupply  in  a  few  specific instances,
characteristically, their  market  value  is affected  solely  by  money  market
fluctuations.
 
    Aa--Bonds  which  are rated  Aa  are judged  to be  of  high quality  by all
standards. Together with the Aaa group they comprise what are generally known as
high grade bonds. They are  rated lower than the  best bonds because margins  of
protection  may  not  be  as  large as  in  Aaa  securities  or  fluctuations of
protective elements may be of greater  amplitude or there may be other  elements
present  which  make the  long-term  risks appear  somewhat  larger than  in Aaa
securities. Their  market value  is virtually  immune to  all but  money  market
influences,  with  the  occasional exception  of  oversupply in  a  few specific
instances.
 
    A--Bonds which are rated A possess many favorable investment attributes  and
are  to be considered as upper medium grade obligations. Factors giving security
to principal and interest are considered  adequate, but elements may be  present
which  suggest a susceptibility to impairment sometime in the future. The market
value of A-rated bonds may be influenced to some degree by economic  performance
during  a sustained period of depressed business conditions, but, during periods
of normalcy, A-rated bonds frequently move in
 
                                      A-40
<PAGE>
parallel  with  Aaa  and  Aa  obligations,  with  the  occasional  exception  of
oversupply in a few specific instances.
 
    Moody's  bond rating  symbols may contain  numerical modifiers  of a generic
rating classification. The modifier 1 indicates that the bond ranks at the  high
end  of its  category; the  modifier 2  indicates a  mid-range ranking;  and the
modifier 3 indicates that the issue ranks in the lower end of its generic rating
category.
 
    Baa--Bonds which are rated Baa  are considered as medium grade  obligations,
i.e.,  they are neither  highly protected nor  poorly secured. Interest payments
and principal security appear  adequate for the  present but certain  protective
elements  may be lacking or may  be characteristically unreliable over any great
length of time. Such  bonds lack outstanding  investment characteristics and  in
fact  have speculative  characteristics as well.  The market  value of Baa-rated
bonds is more  sensitive to changes  in economic circumstances,  and aside  from
occasional  speculative factors applying to some bonds of this class, Baa market
valuations move in  parallel with Aaa,  Aa and A  obligations during periods  of
economic normalcy, except in instances of oversupply.
 
    Con.  (--)--Bonds for which the security depends upon the completion of some
act or the  fulfillment of  some condition  are rated  conditionally. These  are
bonds  secured by (a)  earnings of projects under  construction, (b) earnings of
projects unseasoned  in  operation  experience, (c)  rentals  which  begin  when
facilities are completed, or (d) payments to which some other limiting condition
attaches.  Parenthetical rating denotes probable  credit stature upon completion
of construction or elimination of basis of condition.
 
    NOTE RATINGS:
 
    MIG 1--This designation  denotes  best  quality.  There  is  present  strong
           protection  by established cash flows,  superior liquidity support or
           demonstrated broad-based access to the market for refinancing.
 
    MIG 2--This designation  denotes high  quality.  Margins of  protection  are
           ample although not so large as in the preceding group.
 
                                      A-41
<PAGE>
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                                      A-42
<PAGE>
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                                      A-43
<PAGE>
                      (THIS PAGE INTENTIONALLY LEFT BLANK)
 
                                      A-44
<PAGE>
 
<TABLE>
<C>                <S>        <C>
           NUVEEN             Tax-Exempt Unit Trusts
 
                           PROSPECTUS
                           140,000 Units
                           California Insured Trust 236
                           Colorado Insured Trust 54
                           Georgia Insured Trust 41
                           Pennsylvania Insured Trust
                           190
</TABLE>
 
<PAGE>
 
<TABLE>
<C>                 <S>        <C>
            NUVEEN             Tax-Exempt Unit Trusts
 
           SPONSOR             John Nuveen & Co. Incorporated
                               333 West Wacker Drive
                               Chicago, IL 60606-1286
                               Telephone: 312.917.7700
 
                               Swiss Bank Tower
                               10 East 50th Street
                               New York, NY 10022
                               212.207.2000
 
           TRUSTEE             United States Trust Company
                               of New York
                               770 Broadway
                               New York, NY 10003
                               800.257.8787
 
     LEGAL COUNSEL             Chapman and Cutler
        TO SPONSOR             111 West Monroe Street
                               Chicago, IL 60603
 
       INDEPENDENT             Arthur Andersen LLP
            PUBLIC             33 West Monroe Street
       ACCOUNTANTS             Chicago, IL 60603
    FOR THE TRUSTS
</TABLE>
 
   Except as to statements made herein furnished by the Trustee, the Trustee has
   assumed  no responsibility for the accuracy, adequacy and completeness of the
   information contained in this Prospectus.
                   This Prospectus does not contain  all of the information  set
   forth in the registration statement and exhibits relating thereto, filed with
   the   Securities  and  Exchange  Commission,   Washington,  D.C.,  under  the
   Securities Act of 1933, and to which reference is made.
                   No person is authorized  to give any  information or to  make
   representations  not contained in  this Prospectus or  in supplementary sales
   literature prepared by the Sponsor, and any information or representation not
   contained therein must not be relied upon as having been authorized by either
   the Trusts, the Trustee or the  Sponsor. This Prospectus does not  constitute
   an  offer to sell,  or a solicitation of  an offer to  buy, securities in any
   State to any  person to  whom it is  not lawful  to make such  offer in  such
   state.  The  Trusts  are registered  as  a  Unit Investment  Trust  under the
   Investment Company Act  of 1940. Such  registration does not  imply that  the
   Trusts  or any of their Units  has been guaranteed, sponsored, recommended or
   approved by the United States or any State or agency or officer thereof.
 
   
   768
    
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<LEGEND>
This   schedule  contains  summary  financial  information  extracted  from  the
California Insured  Trust 236  which  is incorporated  in the  Prospectus  dated
November  22,  1994  and is  qualified  in  its entirety  by  reference  to such
prospectus.
</LEGEND>
 
       
<S>                                                <C>
<PERIOD-TYPE>                                      OTHER
<FISCAL-YEAR-END>                                               Oct-31-1995
<PERIOD-END>                                                    Oct-31-1995
<INVESTMENTS-AT-COST>                                             3,056,082
<INVESTMENTS-AT-VALUE>                                            3,067,130
<RECEIVABLES>                                                        60,845
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    3,127,975
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            60,845
<TOTAL-LIABILITIES>                                                  60,845
<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>                                                      3,067,130
<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>                                                 87.63
<PER-SHARE-NII>                                                           0
<PER-SHARE-GAIN-APPREC>                                                   0
<PER-SHARE-DIVIDEND>                                                      0
<PER-SHARE-DISTRIBUTIONS>                                                 0
<RETURNS-OF-CAPITAL>                                                      0
<PER-SHARE-NAV-END>                                                       0
<EXPENSE-RATIO>                                                           0
<AVG-DEBT-OUTSTANDING>                                                    0
<AVG-DEBT-PER-SHARE>                                                      0
        

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

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the Colorado
Insured Trust 54 which is incorporated in the Prospectus dated November 22, 1994
and is qualified in its entirety by reference to such prospectus.
</LEGEND>
 
       
<S>                                                <C>
<PERIOD-TYPE>                                      OTHER
<FISCAL-YEAR-END>                                               Oct-31-1995
<PERIOD-END>                                                    Oct-31-1995
<INVESTMENTS-AT-COST>                                             3,085,289
<INVESTMENTS-AT-VALUE>                                            3,100,120
<RECEIVABLES>                                                        49,918
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    3,150,038
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            49,918
<TOTAL-LIABILITIES>                                                  49,918
<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>                                                      3,100,120
<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>                                                 88.57
<PER-SHARE-NII>                                                           0
<PER-SHARE-GAIN-APPREC>                                                   0
<PER-SHARE-DIVIDEND>                                                      0
<PER-SHARE-DISTRIBUTIONS>                                                 0
<RETURNS-OF-CAPITAL>                                                      0
<PER-SHARE-NAV-END>                                                       0
<EXPENSE-RATIO>                                                           0
<AVG-DEBT-OUTSTANDING>                                                    0
<AVG-DEBT-PER-SHARE>                                                      0
        

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

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<LEGEND>
This  schedule contains summary financial information extracted from the Georgia
Insured Trust 41 which is incorporated in the Prospectus dated November 22, 1994
and is qualified in its entirety by reference to such prospectus.
</LEGEND>
 
       
<S>                                                <C>
<PERIOD-TYPE>                                      OTHER
<FISCAL-YEAR-END>                                               Oct-31-1995
<PERIOD-END>                                                    Oct-31-1995
<INVESTMENTS-AT-COST>                                             3,057,490
<INVESTMENTS-AT-VALUE>                                            3,071,400
<RECEIVABLES>                                                        66,876
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    3,138,276
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            66,876
<TOTAL-LIABILITIES>                                                  66,876
<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>                                                      3,071,400
<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>                                                 87.75
<PER-SHARE-NII>                                                           0
<PER-SHARE-GAIN-APPREC>                                                   0
<PER-SHARE-DIVIDEND>                                                      0
<PER-SHARE-DISTRIBUTIONS>                                                 0
<RETURNS-OF-CAPITAL>                                                      0
<PER-SHARE-NAV-END>                                                       0
<EXPENSE-RATIO>                                                           0
<AVG-DEBT-OUTSTANDING>                                                    0
<AVG-DEBT-PER-SHARE>                                                      0
        

</TABLE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<LEGEND>
This   schedule  contains  summary  financial  information  extracted  from  the
Pennsylvania Insured Trust  190 which  is incorporated in  the Prospectus  dated
November  22,  1994  and is  qualified  in  its entirety  by  reference  to such
prospectus.
</LEGEND>
 
       
<S>                                                <C>
<PERIOD-TYPE>                                      OTHER
<FISCAL-YEAR-END>                                               Oct-31-1995
<PERIOD-END>                                                    Oct-31-1995
<INVESTMENTS-AT-COST>                                             3,077,015
<INVESTMENTS-AT-VALUE>                                            3,090,230
<RECEIVABLES>                                                        76,117
<ASSETS-OTHER>                                                            0
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                    3,166,347
<PAYABLE-FOR-SECURITIES>                                                  0
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                            76,117
<TOTAL-LIABILITIES>                                                  76,117
<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>                                                      3,090,230
<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>                                                 88.29
<PER-SHARE-NII>                                                           0
<PER-SHARE-GAIN-APPREC>                                                   0
<PER-SHARE-DIVIDEND>                                                      0
<PER-SHARE-DISTRIBUTIONS>                                                 0
<RETURNS-OF-CAPITAL>                                                      0
<PER-SHARE-NAV-END>                                                       0
<EXPENSE-RATIO>                                                           0
<AVG-DEBT-OUTSTANDING>                                                    0
<AVG-DEBT-PER-SHARE>                                                      0
        

</TABLE>
 
<PAGE>

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


<PAGE>

                       CONTENTS OF REGISTRATION STATEMENT

A.  BONDING ARRANGEMENTS OF DEPOSITOR:

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

    INSURER/POLICY NO.                                     AMOUNT

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

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

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

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

              The facing sheet
              The Prospectus

              The signatures

              Consents of Independent Public
              Accountants and Counsel as indicated

              Exhibits as listed on page S-5


<PAGE>

                                   SIGNATURES

    The Registrant, Nuveen Tax-Exempt Unit Trust, Series 768 hereby
identifies Series 401, 507, 512, 515, 517, 519 and 723 of the Nuveen 
Tax-Exempt Unit Trust for purposes of the representations required by 
Rule 487 and represents the following:

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

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

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

    Pursuant to the requirements of the Securities Act of 1933, the
Registrant, Nuveen Tax-Exempt Unit Trust, Series 768 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 11/22/94.

 
                                NUVEEN TAX-EXEMPT UNIT TRUST, SERIES 768
                                (Registrant)

                                By JOHN NUVEEN & CO. INCORPORATED
                                (Depositor)


                       
                                By: Larry Woods Martin
                                    _________________________________
                                    Vice President


                        
                           Attest:  Morrison C. Warren
                                    __________________________________
                                    Assistant Secretary


<PAGE>

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


    SIGNATURE                     TITLE*                       DATE

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

O. Walter Renfftlen     Vice President and Controller )
                        (Principal Accounting Officer))
                                                      )
                                                      )11/22/94
___________________

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

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



<PAGE>

768

                   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
11/22/94


                         CONSENT OF CHAPMAN AND CUTLER

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

                            CONSENT OF STATE COUNSEL

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

                   CONSENT OF STANDARD + POOR'S CORPORATION

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

                   CONSENT OF KENNY S+P EVALUATION SERVICES

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

                      CONSENT OF CARTER, LEDYARD & MILBURN

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

<PAGE>

                                LIST OF EXHIBITS


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

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

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

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

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

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

4.1      Consent of Standard + Poor's Corporation.

4.2      Consent of Kenny S+P Evaluation Services.

4.3      Consent of Carter, Ledyard & Milburn.

                                                                      
<PAGE>                                                                        
                                                                              
Exhibit 1.1(b)                                                                
                                                                              
                                                                              
                                                                              
                                                                              
                                 SCHEDULE A                                   
                                                                              
                                                                              
Series 768                                           November 22, 1994        
                                                                              
Item 1.  This Indenture relates to the Nuveen Tax-Exempt Unit Trust           
         Series 768.                                                          
                                                                              
Item 2.  The date of this Indenture is November 22, 1994.                     
                                                                              
Item 3.  Series 768 shall initially contain Trusts as follows:                
                                                                              
         (a)   California Insured Trust 236                                   
         (b)   Colorado Insured Trust 54                                      
         (c)   Georgia Insured Trust 41                                       
         (d)   Pennsylvania Insured Trust 190                                 
                                                                              
                                                                              
Item 4.  Each Trust shall initially consist of the following number of Units: 
                                                                              
         (a)   California Insured Trust                 35,000 Units          
         (b)   Colorado Insured Trust                   35,000 Units          
         (c)   Georgia Insured Trust                    35,000 Units          
         (d)   Pennsylvania Insured Trust               35,000 Units          
                                                                              
                                                                              
Item 5.  (a) The amount of the second distribution from the Interest          
             Account of the respective Trusts will be as follows:             
                                                                              
         ( 1)  California Insured Trust                $ .6388 per Unit       
         ( 2)  Colorado Insured Trust                  $ .6364 per Unit       
         ( 3)  Georgia Insured Trust                   $ .6279 per Unit       
         ( 4)  Pennsylvania Insured Trust              $ .6380 per Unit       
                                                                              
         (b) The date of the second distribution from the Interest Account    
             of the respective Trusts will be as follows:                     
                                                                              
         ( 1)  California Insured Trust                January 15, 1995       
         ( 2)  Colorado Insured Trust                  January 15, 1995       
         ( 3)  Georgia Insured Trust                   January 15, 1995       
         ( 4)  Pennsylvania Insured Trust              January 15, 1995       
                                                                              
         (c) The record date for the second distribution from the             
             Interest Account of the respective Trusts will be as             
             follows:                                                         
                                                                              
         ( 1)  California Insured Trust                January 1, 1995        
         ( 2)  Colorado Insured Trust                  January 1, 1995        
         ( 3)  Georgia Insured Trust                   January 1, 1995        
         ( 4)  Pennsylvania Insured Trust              January 1, 1995        
                                                                              
                                                                              
         PAGE 2                                                               
                                                                              
                                                                              
Item 6.  Record dates for subsequent semi-annual distributions from the       
         Interest Account for each of the respective Trusts will be the 1st   
         day of May and November of each year.                                
                                                                              
                                                                              
Item 7.  (a) Record date for distibution from the Principal Account of each   
             of the respective Trusts will be the first day of May and        
             November of each year.                                           
                                                                              
         (b) The first record date for distributions from the Principal       
             Account of each of the respective Trusts will be                 
             May 1, 1995.                                                     
                                                                              
                                                                              
Item 8.  The Trust shall in no event continue beyond the end of the calendar  
         year preceding the fiftieth anniversary of the execution of this     
         Indenture for National and State Trusts, beyond the end of the       
         calendar year preceding the twentieth anniversary of its execution   
         for Long Intermediate and Intermediate Trusts and beyond the end of  
         the calendar year preceding the tenth anniversary of its execution   
         for Short Intermediate and Short Term Trusts.                        
                                                                              
                                                                              
Item 9.  Quarterly distributions from the Interest Account of the respective  
         Trusts will be computed as of the 1st day of February, May, August,  
         and November.                                                        
                                                                              
                                                                              
Item 10. Certain deductions from the Interest Account by the Trustee          
         will commence as follows:                                            
                                                                              
         (a)   California Insured Trust                January 1, 1995        
         (b)   Colorado Insured Trust                  January 1, 1995        
         (c)   Georgia Insured Trust                   January 1, 1995        
         (d)   Pennsylvania Insured Trust              January 1, 1995        
                                                                              
Item 11. (a)  For services performed prior to the date indicated in           
              Item 5(c) of this Schedule A, the Trustee shall be paid at      
              the following annual rates per $1,000 of principal amount       
              of Bonds:                                                       
                                                                              
         ( 1)  California Insured Trust                $1.8504                
         ( 2)  Colorado Insured Trust                  $1.6059                
         ( 3)  Georgia Insured Trust                   $1.7492                
         ( 4)  Pennsylvania Insured Trust              $1.7571                
                                                                              
         (b)  For services performed on or after the date indicated in        
              Item 5(c) of this Schedule A, the Trustee shall be paid at      
              the following annual rates per $1,000 of principal amount       
              of Bonds:                                                       
                                                                              
         ( 1)  California Insured Trust                                       
                                                                              
               Monthly Plan of Distribution                  $1.8504          
               Quarterly Plan of Distribution                $1.5304          
               Semi-Annual Plan of Distribution              $1.3404          
                                                                              
         ( 2)  Colorado Insured Trust                                         
                                                                              
               Monthly Plan of Distribution                  $1.6059          
               Quarterly Plan of Distribution                $1.2859          
               Semi-Annual Plan of Distribution              $1.0959          
                                                                              
         ( 3)  Georgia Insured Trust                                          
                                                                              
               Monthly Plan of Distribution                  $1.7492          
               Quarterly Plan of Distribution                $1.4292          
               Semi-Annual Plan of Distribution              $1.2392          
                                                                              
         ( 4)  Pennsylvania Insured Trust                                     
                                                                              
               Monthly Plan of Distribution                  $1.7571          
               Quarterly Plan of Distribution                $1.4371          
               Semi-Annual Plan of Distribution              $1.2471          
                                                                              
                                                                              
                                                                              
                            ADDITIONAL SCHEDULES                              
                                                                              
                                                                              
                         BONDS INITIALLY DEPOSITED                            
                                                                              
                  NUVEEN TAX-EXEMPT UNIT TRUST SERIES 768                     
                                                                              
                                                                              
                                                                              
                                                                              
Incorporated herein and made a part hereof as indicated below are the         
following annual rates per $1,000 of principal amount of Bonds:               
corresponding portions of the 'Schedules of Investments at Date of Deposit'   
contained in the Prospectus dated the Date of Deposit and relating to the     
above-named Series:                                                           
                                                                              
         Schedule B:  California Insured Trust 236                            
         Schedule C:  Colorado Insured Trust 54                               
         Schedule D:  Georgia Insured Trust 41                                
         Schedule E:  Pennsylvania Insured Trust 190                          


<PAGE>

EXHIBIT 3.1

(ON CHAPMAN AND CUTLER LETTERHEAD)

11/22/94


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

RE:  Nuveen Tax-Exempt Unit Trust, Series 768

Gentlemen:

    We have served as counsel for you, as depositor of Nuveen Tax-Exempt Unit
Trust, Series 768 (hereinafter referred to as the "Fund"), in connection
with the issuance under the Trust Indenture and Agreement dated the date 
hereof between John Nuveen & Co. Incorporated, as Depositor, and United 
States Trust Company of New York, as Trustee, of Units of fractional 
undivided interest in the one or more Trusts of said Fund (hereinafter 
referred to as the "Units").
 
    In connection therewith, we have examined such pertinent records and
documents and matters of law as we have deemed necessary in order to enable us
to express the opinions hereinafter set forth.

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

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

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

    We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement (File No. 33-56357) relating to the Units referred
to above and to the use of our name and to the reference to our firm in said
Registration Statement and in the related Prospectus.

Respectfully submitted,



CHAPMAN AND CUTLER

<PAGE>

EXHIBIT 3.2

(ON CHAPMAN AND CUTLER LETTERHEAD)

11/22/94

John Nuveen & Co. Incorporated
333 W. Wacker Drive
Chicago, Illinois  60606
RE:  Nuveen Tax-Exempt Unit Trust, Series 768

Gentlemen:

    We have served as counsel for you, as Depositor of Nuveen Tax-Exempt Unit
Trust, Series 768 (the "Fund") in connection with the issuance under the
Trust Indenture and Agreement, dated the date hereof between John Nuveen & Co.
Incorporated, as Depositor, and United States Trust Company of New York, as
Trustee, of Units of fractional undivided interest (the "Units"), as evidenced
by a book entry position or certificate, if requested by the purchaser of 
Units, in the one or more Trusts of said Fund.

    We have also served as counsel for you in connection with all previous
Series of the Nuveen Tax-Exempt Unit Trust and as such have previously 
examined such pertinent records and documents and matters of law as we have 
deemed necessary, including (but not limited to) the Trust Indenture and 
Agreements with respect to those series.  We have also examined such 
pertinent records and documents and matters of law as we have deemed 
necessary including (but not limited to) the Trust Indenture and Agreement 
relating to Nuveen Tax-Exempt Unit Trust, Series 768.

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

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

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

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

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

<PAGE>

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

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

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

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

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

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

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

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

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

<PAGE>

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

    "The Revenue Reconciliation Act of 1993" (the "Tax Act") subjects tax-exempt
bonds to the market discount rules of the Code effective for bonds purchased
after April 30, 1993.  In general, market discount is the amount (if any) by
which the stated redemption price at maturity exceeds an investor's purchase
price (except to the extent that such difference, if any, is attributable to
original issue discount not yet accrued).  Market discount can arise based on
the price a Trust pays for Bonds or the price a Unitholder pays for his or her
Units.  Under the Tax Act, accretion of market discount is taxable as ordinary
income; under prior law, the accretion had been treated as capital gain.  Market
discount that accretes while a Trust holds a Bond would be recognized as
ordinary income by the Unitholders when principal payments are received on the
Bond, upon sale or at redemption (including early redemption), or upon the sale
or redemption of his or her Units, unless a Unitholder elects to include market
discount in taxable income as it accrues.
     
    We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement (File No. 33-56357) relating to the Units referred
to above and to the use of our name and to the reference to our firm in said
Registration Statement and in the related Prospectus.

Respectfully submitted,


CHAPMAN AND CUTLER

<PAGE>


EXHIBIT 3.3

(ON ORRICK, HERRINGTON & SUTCLIFFE LETTERHEAD)




11/22/94


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

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

     Re: Nuveen Tax-Exempt Unit Trust, Series 768
            
            
         California Insured Trust 236  
            
                  

Dear Sirs:

        We have acted as special California counsel for John Nuveen & Co.
Incorporated, as Depositor of the above captioned trust(s) (each a "Trust"),
in connection with the issuance under the Trust Agreement dated 11/22/94,
among John Nuveen & Co. Incorporated, as Depositor, and United States Trust
Company of New York, as Trustee, of units of fractional undivided
interest in each Trust (the "Units") in exchange for certain bonds, as well as
"regular-way" and "when-issued" contracts for the purchase of bonds (such
bonds and contracts are hereinafter referred to collectively as the
Securities").

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

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

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

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

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

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

<PAGE> 

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


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

        We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement (File No. 33-56357) relating to the Units referred to
above and to the use of our name and to the reference to our firm in said
Registration Statement and in the related Prospectus.

Very truly yours,



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




<PAGE>

EXHIBIT 3.3


(ON SHERMAN & HOWARD L.L.C. LETTERHEAD)

11/22/94


Nuveen Tax-Exempt Unit Trust,
Series 768
c/o United States Trust Company of
New York, Trustee
770 Broadway
New York, New York  10003

RE:  
    Colorado Insured Trust 54

Ladies and Gentlemen:

    We have acted as special counsel to the Nuveen Tax-Exempt Unit Trust, 
Series 768 (the "Fund") with respect to certain applications of the
income tax law of the State of Colorado to the above captioned Trust(s)
created as part of the Fund (the "Colorado Trust(s)") and to the holders of
certificates or registered holders of book entry positions evidencing
ownership of fractional undivided interest ("Units") in the Colorado Trust(s)
who are residents of the State of Colorado ("Colorado Unitholders").

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

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

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

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

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

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

<PAGE>

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

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

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

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

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

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


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

    We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement (File No. 33-56357) relating to the Units referred
to above and to the use of our name and the reference to our firm in such
Registration Statement, and in the related Prospectus, under the "Tax Status"
heading for each Colorado Trust in the Fund.  In addition, we authorize United
States Trust Company of ew York to rely upon this opinion in its capacity
as Trustee of the Fund.

Very truly yours,


SHERMAM & HOWARD L.L.C.

<PAGE>

EXHIBIT 3.3


(ON CHAPMAN & CUTLER LETTERHEAD)

11/22/94


Nuveen Tax-Exempt Unit Trust,
Series 768
c/o John Nuveen & Co. Incorporated
333 West Wacker Drive
Chicago, Illinois  60606

United States Trust Company of New York,
   as Trustee for Nuveen Tax-Exempt Unit
   Trust, Series 768
770 Broadway
New York, New York  10003

          Re:   
               Georgia Insured Trust 41
Gentlemen:

         We have acted as counsel to Nuveen Tax-Exempt Unit Trust, Series
768, with respect to certain matters preliminary to the issuance and sale
of units of interest therein (the "Units") pursuant to a Trust Indenture and
Agreement, dated as of the date hereof (the "Indenture"), between John
Nuveen & Co. Incorporated, as depositor (the "Depositor"), and United States
Trust Company of New York, as trustee (the "Trustee").  The Units represent
fractional undivided interests in the principal of and net income on
obligations deposited in one of several separate trusts including the
above-captioned trust (the "Trust"), will be evidenced by a certificate
(the "Certificate") and will be sold to various investors (the "Unitholders").
Each separate trust will be administered as a distinct entity with
separate certificates, investments, expenses, books and records.

         The assets of the Trust will consist of interest-bearing obligations
issued by or on behalf of the State of Georgia (the "State") or counties,
municipalities, authorities or political subdivisions thereof (the "Georgia
Bonds") or by the Commonwealth of Puerto Rico or its political subdivisions
(the "Puerto Rico Bonds") (collectively, the "Bonds").  Distributions of
interest on the Bonds received by the Trust will be made semi-annually unless
a Unitholder elects to receive them monthly or quarterly.

         Although we express no opinion with respect therto, in rendering the
opinion expressed herein, we have assumed that the Bonds were validly issued
by the State of Georgia or its instrumentalities or municipalities and the
Commonwealth of Puerto Rico, or its instrumentalities or municipalities, as
the case may be.


PAGE END

<PAGE>

         Based on the foregoing, and review and consideration of existing
State laws, it is our opinion, and we herewith advise you, as follows:

    1.  For purposes of income taxation by the State of Georgia or any
of its counties or municipalities:

         (a)  The Trust is not an association taxable as a corporation and
each Unitholder of the Trust will be treated as the owner of a pro-rata
portion of the Trust, and the income of the Trust will therefore be treated
as the income of the Unitholder;

         (b)  Interest on the Georgia Bonds and the Puerto Rico Bonds
which is excludable from gross income for federal income tax purposes
when received by the Trust will be exempt from Georgia income taxation
and therefore will not be includible in the income of the Unitholder
for income tax purposes when distributed by the Trust and received by
the Unitholder;

         (c)  Each Unitholder of the Trust will recognize gain or
loss for income tax purposes if the Trustee disposes of a bond
(whether by sale, exchange, payment on maturity, retirement or other-
wise) or if the Unitholder redeems or sells Units of the Trust
to the extent that such transaction results in a recognized gain or
loss for federal income tax purposes;

         (d)  Due to the amortization of bond premium and the basis adjust-
ments required by the Internal Revenue Code, a Unitholder, under some
circumstances, may realize taxable gain when his or her Units are sold or
redeemed prior to the maturity of Bonds held by the Trust for an amount
equal to such Units' original cost;

         (e)  In the case of Georgia Bonds issued before March 11, 1987
with original issue discount the amount of gain or loss recognized for
income tax purposes upon such sale or redemption of Bonds or
Units may differ from the amount recognized for federal income tax purposes
because original issue discount on such Bonds will accrue on ratable basis
under Georgia law;

         (f)  Interest on indebtedness incurred by a Unitholder to
purchase or carry Units of the Trust and Trustee fees and related expenses
incurred by the Trust which are not deductible for federal income tax
purposes are also not deductible under Georgia law;

    2.  Units of the Trust are not subject to sales or use taxation by
the State of Georgia or any political subdivision thereof;

    3.  Georgia Bonds and Bonds issued by the Government of Puerto Rico are
not subject to intangible personal property  taxation by the State of
Georgia or any political subdivision thereof and although there is currently
no published administrative interpretation or opinion of the Attorney General
of Georgia dealing with the status of bonds issued by a political subdivision
of Puerto Rico, we have in the past, been advised orally by representatives
of the Georgia Department of Revenue that such bonds would also be considered
exempt from such tax;

    4.  No opinion is expressed regarding whether Units of the Trust
are subject to intangilble personal property taxation by the State of
Georgia, however, according to discussions with the Georgia Department of
Revenue, it is the Department's view that Units of the Trust would be
subject to such tax;

    5.  Georgia Bonds and Puerto Rico Bonds are not subject to sales or
use taxation by the State of Georgia or any political subdivision thereof;



    6.  In the case of Trusts for which an insurance policy or policies with
respect to the payment of principal and interest on the Georgia Bonds and
Puerto Rico Bonds has been obtained by the Depositor, any proceeds paid under
such policy or policies issued to the Trust, if any, with respect to the Bonds
in the Trust which represent maturing interest on defaulted obligations held
by the Trustee will be exempt from State income taxes if, and to the same ex-
tent as, such interest would have been so exempt if paid by the issurer of the
defaulted obligations 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 1(b) of this opinion 
is accordingly applicable to policy proceeds representing maturing interest.

          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 taxes of interest on the Bonds if received
directly by a Unitholder.

          We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement (No. 33-56357) filed pursuant to the Securities Act of
1933, as amended (the "Act"), with respect to the registration of the sale of
the Units by Nuveen Tax-Exempt Unit Trust, Series 768, and to the 
references to our firm in such Registration Statement and the preliminary 
prospectus included therein.  In giving such consent, we do not thereby admit
that we are persons whose consent is required by Section 7 of the Act, or the 
rules and regulations thereunder.

Very truly yours,



Chapman & Cutler


<PAGE>

EXHIBIT 3.3


(On Dechert Price & Rhoads Letterhead)

11/22/94


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

RE:  Nuveen Tax-Exempt Unit Trust, Series 768
      
     Pennsylvania Insured Trust 190

Gentlemen:

    You have requested our opinion as to the Pennsylvania tax aspects of the
above-captioned Trust(s) (the "Pennsylvania Trust(s)") which is (are) a part
of the Nuveen Tax-Exempt Unit Trust Series 768 ("Fund").  The Fund is
organized under the Trust Indenture and Agreement, of even date, between John
Nuveen & Co. Incorporated, as Depositor, and United States Trust Company of
New York, as Trustee.  The Fund will contain several trusts, including the
Pennsylvania Trust(s), which will issue Units of fractional undivided
interests.  The Units will be purchased by various investors ("Unit Holder").
Each Unit of the Pennsylvania Trust(s) represents a fractional undivided
interest in the principal and net income of such Trust(s) in the ratio of ten
Units for each $1,000 of value of the obligations initially acquired by such
Trust(s).  Each Pennsylvania Trust will be administered as a distinct entity
with separate certificates, investments, expenses, books and records.
 
    The proceeds of the sale of the Units will be invested primarily in
interest-bearing obligations issued by or on behalf of the Commonwealth of
Pennsylvania, its agencies and instrumentalities, or political subdivisions
thereof, including any county, city, borough, town, township, school disrict,
municipality, and local housing or parking authority in the Commonwealth of
Pennsylvania or issued by Puerto Rico, the Virgin Islands, Guam or the
Northern Mariana Islands ("Bonds").  Distributions of the interest received by
the Trust will be made semi-annually unless the Unit Holder elects otherwise.
In the opinion of bond counsel to each issuer, the interest on all bonds in
the Trust is exempt fromn federal income tax under existing law.

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

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

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

<PAGE>

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

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

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

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

    We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement (No. 33-56357) relating to the Units referred to
above, and to the reference to our firm as special Pennsylvania tax counsel in
said Registration Statement and in the related Prospectus.

Very truly yours,


DECHERT PRICE & RHOADS


<PAGE>

EXHIBIT 4.1

(ON STANDARD & POOR'S CORPORATION LETTERHEAD)

11/22/94

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

RE: Nuveen Tax-Exempt Unit Trust, Series 768

Gentlemen:

    This is in response to your requests regarding the above-
captioned fund which consists of separate underlying unit investment trusts
(the "trusts"), SEC file # 33-56357.

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

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

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

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

Very truly yours,

STANDARD & POOR'S CORPORATION


 By Vincent S. Orgo



<PAGE>

EXHIBIT 4.2

(On Kenny S+P Evaluation Services Inc., Letterhead)

11/22/94

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

RE:  Nuveen Tax Exempt Unit Trust, Series 768

Gentlemen:

      We have examined the Registration Statement File No. 33-56357,
for the above captioned trust.  We hereby acknowledge that Kenny S+P
Evaluation Services, a division of Kenny Information Systems, 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 Kenny Information Systems, 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,


 John R. Fitzgerald
 



<PAGE>

                                   MEMORANDUM

                 Nuveen Tax-Exempt Unit Trust, Series 768
                               File No. 33-56357


    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 11/22/94,
and to set forth certain statistical data based thereon.  In addition, there 
are a number of other changes from the Prospectus as originally filed to which
reference is made, including the increase in the size of the Fund, a
corresponding increase in the number of Units and a change in the individual
trusts constituting the Fund.  All references to the Units, prices and related
statistical data will apply to each trust of the Fund and the Units thereof
individually.

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

                                    FORM S-6

    FACING SHEET.  The file number is now shown.

                                 THE PROSPECTUS

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

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

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

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

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

         Data regarding the composition of the portfolio of each
         Trust

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

         Concentrations of issues by purpose in each Trust

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

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

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

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

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

         The distribution table for each Trust

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

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

         The amount of the Trustee's Fee

                             THE INDENTURE

The Schedules to the Indenture have been completed.


CHAPMAN AND CUTLER


Chicago, Illinois

11/22/94


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