NUVEEN TAX EXEMPT UNIT TRUST SERIES 786
497, 1995-02-24
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<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     MARYLAND
     TRUST 304
              (MARYLAND TRADITIONAL TRUST 304)
 
            Estimated Current Return
            5.52% to 5.74%
            as of 02/22/95
 
            Estimated Long Term Return
            5.63% to 5.85%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds
                  Cusip:
                  67101L 829 Monthly Payment Option
                  67101L 837 Quarterly Payment Option
                  67101L 845 Semi-Annual Payment Option
 
                  Registered in Maryland
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Philadelphia
New York, New York 10022      Phoenix
Telephone: 212.207.2000       San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--MARYLAND TRADITIONAL TRUST 304
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT FEBRUARY 23, 1995
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $  500,000    Maryland Health and Higher Educational Facilities Authority,       2004 at 102          AAA           Aaa
                  Revenue Bonds, Maryland General Hospital Issue, Series
                  1994, 6.20% Due 7/1/24. (MBIA Insured.)
     500,000    Maryland Health and Higher Educational Facilities Authority,       2003 at 102           A            A1
                  Refunding Revenue Bonds, Suburban Hospital Issue, Series
                  1993, 5.125% Due 7/1/21. (Original issue discount bonds
                  delivered on or about October 14, 1993 at a price of
                  94.689% of principal amount.)
     500,000    Maryland Water Quality Financing Administration, Revolving         2004 at 100          AA            Aa
                  Loan Fund Revenue Bonds, Series 1994 A, 6.00% Due 9/1/15.
                  (Original issue discount bonds delivered on or about
                  January 11, 1995 at a price of 93.279% of principal
                  amount.)
     500,000    Anne Arundel County, Maryland, General Obligation Bonds,           2003 at 102          AA+           Aa
                  Consolidated Water and Sewer Series, 1993 Refunding
                  Series, 5.30% Due 4/15/16.
     500,000    Anne Arundel County, Maryland, Pollution Control Revenue           2004 at 102           A            A2
                  Refunding Bonds (Baltimore Gas and Electric Company
                  Project), Series 1994, 6.00% Due 4/1/24.
     500,000    Montgomery County, Maryland, Pollution Control Revenue             2004 at 102          A+            A1
                  Refunding Bonds (Potomac Electric Project), 1994 Series,
                  5.375% Due 2/15/24.
     500,000    Wicomico County, Maryland, General Obligation Consolidated         2005 at 101          AAA           Aaa
                  Public Improvement Bonds of 1995, 5.85% Due 2/1/15. (When
                  issued.) (FGIC Insured.)
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION    The sales charges/volume discounts below
apply on all concurrent purchases of any Nuveen trust units, unless any such
purchases are made by a class of investors for which a separate sales charge is
applicable as described more fully in the Prospectus. Estimated Current Return
equals net income divided by offering price. Estimated Long Term Return
represents an average of the yields to maturity (or call) of the Bonds in the
Trust adjusted to reflect expenses and sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                          Estimated Current Return (2)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-499                 $5,000-$49,999   4.90 %   $     99.28          5.52%            5.55%            5.57%
500-999                 50,000-99,999   4.75           99.13          5.53             5.56             5.58
1,000-2,499           100,000-249,999   4.50           98.87          5.54             5.58             5.59
2,500-4,999           250,000-499,999   4.25           98.61          5.56             5.59             5.61
5,000-9,999           500,000-999,999   3.50           97.84          5.60             5.63             5.65
10,000-24,999     1,000,000- 2,499,999  3.00           97.34          5.63             5.66             5.68
25,000-49,999     2,500,000- 4,999,999  2.50           96.84          5.66             5.69             5.71
50,000 and over    5,000,000 and over   2.00           96.35          5.69             5.72             5.74
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                         Estimated Long Term Return (3)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-499                 $5,000-$49,999   4.90 %   $     99.28          5.63%            5.66%            5.68%
500-999                 50,000-99,999   4.75           99.13          5.64             5.66             5.68
1,000-2,499           100,000-249,999   4.50           98.87          5.65             5.68             5.70
2,500-4,999           250,000-499,999   4.25           98.61          5.67             5.69             5.71
5,000-9,999           500,000-999,999   3.50           97.84          5.71             5.74             5.76
10,000-24,999     1,000,000- 2,499,999  3.00           97.34          5.74             5.77             5.79
25,000-49,999     2,500,000- 4,999,999  2.50           96.84          5.77             5.80             5.82
50,000 and over    5,000,000 and over   2.00           96.35          5.80             5.83             5.85
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to Date of Deposit. The estimated
    current return for purchases made on such date will be as shown, as long as
    the portfolio size and composition remain the same.
(3) In contrast to Estimated Current Return, Estimated Long
    Term Return reflects the amortization of premium or accretion of discount,
    if any, on the bonds in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                      Normal
                                                                                                  Distributions
Maryland Traditional Trust                                        1995                              per Year +
<S>                                     <C>            <C>            <C>            <C>        <C>
- ------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        4/1            5/1            8/1           11/1
Distribution Date.....................       4/15           5/15           8/15          11/15
- ----------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .5783(1)                                              $  5.4802
                                                        --------  $.4566 every month  --------
Quarterly Distribution Plan...........  $   .5783(1)   $   .4593(2)   $  1.3779      $  1.3779    $  5.5122
Semi-Annual Distribution Plan.........  $   .5783(1)   $   .4608(3)                  $  2.7648    $  5.5312
- ----------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The second distribution under the quarterly distribution plan represents a 1-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 1-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.14 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01522 per unit per day.
Consequently, on the first Record Date (04/01/95), accrued interest will total
$0.5783 per unit for the 38-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 04/01/95 is $.5783 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01522              Quarterly - $0.01531
                             Semi-Annual - $0.01536
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
 
                                                          786
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 25.1 years.
The first bond is scheduled to mature in February, 2015, with the last bond
maturity being July, 2024.
 
- -------------------------------------------------------
 
QUALITY OF PORTFOLIO AS RATED BY
STANDARD & POOR'S CORPORATION
OR MOODY'S INVESTORS SERVICES
- -------------------------------------------------------
 
<TABLE>
<S>                       <C>                    <C>
Rating                    Percent of Portfolio
Category                  Par Value
- --------------------------------------------------------------------
AAA                           29%
AA                            29
A1/A+                         28
A                             14
                             ---
                             100%
</TABLE>
 
- -------------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------------
 
NO CHARGE FOR REDEMPTION   The Trustee, United States Trust Company of New York,
will redeem units at net asset value. In addition, John Nuveen & Co.
Incorporated intends to maintain a secondary market for this Nuveen Tax-Exempt
Unit Trust. Inasmuch as all securities investments are subject to market price
fluctuation, net asset value at the time of redemption could be more or less
than the initial investment.
 
- -------------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
 
- -------------------------------------------------------
 
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.
 
- -------------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-257-8787
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     NATIONAL
     INSURED
     TRUST 291
 
            Estimated Current Return
            5.68% to 5.90%
            as of 02/22/95
 
            Estimated Long Term Return
            5.75% to 5.98%
             100,000 units in a
             diversified $10,000,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  6710A3 613 Monthly Payment Option
                  6710A3 621 Quarterly Payment Option
                  6710A3 639 Semi-Annual Payment Option
 
                  Registered in all states
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Philadelphia
New York, New York 10022      Phoenix
Telephone: 212.207.2000       San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--INSURED, NATIONAL INSURED TRUST 291
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT FEBRUARY 23, 1995
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $1,000,000    The Regents of the University of California, Refunding             2003 at 102          AAA           Aaa
                  Revenue Bonds (Multiple Purpose Projects), Series B, 6.00%
                  Due 9/1/13.
      75,000    Colorado Health Facilities Authority, Hospital Revenue Bonds       2003 at 102          AAA           Aaa
                  (North Colorado Medical Center), Series 1993, 6.00% Due
                  5/15/20.
   1,000,000    Hillsborough County Industrial Development Authority               2004 at 102          AAA           Aaa
                  (Florida), Pollution Control Revenue Refunding Bonds
                  (Tampa Electric Company Project), Series 1994, 6.25% Due
                  12/1/34.
   1,500,000    Illinois Health Facilities Authority, Revenue Bonds, Series        2004 at 102          AAA           Aaa
                  1994A (The University of Chicago Hospitals Project),
                  6.125% Due 8/15/24.
     500,000    City of Chicago (Illinois), Wastewater Transmission Revenue        2005 at 102          AAA           Aaa
                  Bonds, Series 1994, 6.375% Due 1/1/24.
     395,000    Public Building Commission of Chicago (Illinois), Building         2003 at 102          AAA           Aaa
                  Revenue Bonds, Series A of 1993 (Board of Education of the
                  City of Chicago), 5.75% Due 12/1/18. (General Obligation
                  Bonds.)
   1,000,000    City of Council Bluffs, Iowa, Pollution Control Refunding          2003 at 102          AAA           Aaa
                  Revenue Bonds (Midwest Power Systems Inc. Project), Series
                  1993, 5.95% Due 5/1/23.
     275,000    New Hampshire Higher Educational and Health Facilities             2004 at 102          AAA           Aaa
                  Authority Revenue Bonds, The Hitchcock Clinic Issue,
                  Series 1994, 6.00% Due 7/1/24.
   1,000,000    Dormitory Authority of the State of New York, City                 2003 at 102          AAA           Aaa
                  University System Consolidated Revenue Bonds, Series
                  1993F, 5.50% Due 7/1/12.
     755,000    Metropolitan Transportation Authority (New York), Transit          2004 at 101          AAA           Aaa
                  Facilities Revenue Bonds, Series O, 6.00% Due 7/1/24.                1/2
                  (Original issue discount bonds delivered on or about July
                  12, 1994 at a price of 94.872% of principal amount.)
   1,000,000    Harris County Health Facilities (Texas), Development               2004 at 101          AAA           Aaa
                  Corporation Hospital Revenue Bonds (Hermann Hospital),
                  Series 1994, 6.375% Due 10/1/24.
     500,000    King County, Washington, Department of Metropolitan                2004 at 102          AAA           Aaa
                  Services, General Obligation Sewer Revenue Bonds, 1994
                  Series A, 6.25% Due 1/1/34.
   1,000,000    Washington Public Power Supply System (Bonneville), Nuclear        2003 at 102          AAA           Aaa
                  Project No. 1 Refunding Revenue Bonds, Series 1993C,
                  5.375% Due 7/1/15.
  ----------
  $10,000,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION    The sales charges/volume discounts below
apply on all concurrent purchases of any Nuveen trust units, unless any such
purchases are made by a class of investors for which a separate sales charge is
applicable as described more fully in the Prospectus. Estimated Current Return
equals net income divided by offering price. Estimated Long Term Return
represents an average of the yields to maturity (or call) of the Bonds in the
Trust adjusted to reflect expenses and sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                          Estimated Current Return (2)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-499                 $5,000-$49,999   4.90 %   $    101.79          5.68%            5.71%            5.73%
500-999                 50,000-99,999   4.75          101.63          5.69             5.72             5.74
1,000-2,499           100,000-249,999   4.50          101.36          5.70             5.73             5.75
2,500-4,999           250,000-499,999   4.25          101.10          5.71             5.75             5.77
5,000-9,999           500,000-999,999   3.50          100.31          5.76             5.79             5.81
10,000-24,999     1,000,000- 2,499,999  3.00           99.79          5.79             5.82             5.84
25,000-49,999     2,500,000- 4,999,999  2.50           99.28          5.82             5.85             5.87
50,000 and over    5,000,000 and over   2.00           98.78          5.85             5.88             5.90
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                         Estimated Long Term Return (3)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-499                 $5,000-$49,999   4.90 %   $    101.79          5.75%            5.78%            5.80%
500-999                 50,000-99,999   4.75          101.63          5.76             5.79             5.81
1,000-2,499           100,000-249,999   4.50          101.36          5.78             5.81             5.83
2,500-4,999           250,000-499,999   4.25          101.10          5.79             5.82             5.84
5,000-9,999           500,000-999,999   3.50          100.31          5.84             5.87             5.89
10,000-24,999     1,000,000- 2,499,999  3.00           99.79          5.87             5.90             5.92
25,000-49,999     2,500,000- 4,999,999  2.50           99.28          5.90             5.93             5.95
50,000 and over    5,000,000 and over   2.00           98.78          5.93             5.96             5.98
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to Date of Deposit. The estimated
    current return for purchases made on such date will be as shown, as long as
    the portfolio size and composition remain the same.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                      Normal
                                                                                                  Distributions
National Insured Trust                                            1995                              per Year +
<S>                                     <C>            <C>            <C>            <C>        <C>
- ------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        4/1            5/1            8/1           11/1
Distribution Date.....................       4/15           5/15           8/15          11/15
- ----------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .6095(1)                                              $  5.7777
                                                        --------  $.4812 every month  --------
Quarterly Distribution Plan...........  $   .6095(1)   $   .4839(2)   $  1.4517      $  1.4517    $  5.8097
Semi-Annual Distribution Plan.........  $   .6095(1)   $   .4857(3)                  $  2.9142    $  5.8287
- ----------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The second distribution under the quarterly distribution plan represents a 1-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 1-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.14 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01604 per unit per day.
Consequently, on the first Record Date (04/01/95), accrued interest will total
$0.6095 per unit for the 38-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 04/01/95 is $.6095 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01604              Quarterly - $0.01613
                             Semi-Annual - $0.01619
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
<PAGE>
- -------------------------------------------------
 
DIVERSIFICATION OF PORTFOLIO INCOME
 
There are 13 Tax-exempt bond issues in this trust; this diversified portfolio
yields current income from issuers in 9 states.
- -------------------------------------------------------
<TABLE>
<CAPTION>
                   Percent
                   of Total
                   Income
<S>                    <C>        <C>
- ------------------------
                                  %
California                  10.0
Colorado                     0.8
Florida                     10.4
Iowa                         9.9
Illinois                    24.4
 
<CAPTION>
                   Percent
                   of Total
                   Income
- ------------------------
<S>                    <C>        <C>
                                  %
New Hampshire                2.8
New York                    16.8
Texas                       10.7
Washington                  14.2
</TABLE>
 
- -------------------------------------------------
 
AVERAGE PORTFOLIO LIFE The average maturity
of portfolio bonds is 27.3 years. The first bond is scheduled to mature in July,
2012, with the last bond maturity being December, 2034.
 
- -------------------------------------------------
 
BONDS INSURED BY MBIA   Each bond in this Nuveen Insured series has been
insured* by the Municipal Bond Investors Assurance Corporation, which guarantees
timely payments of principal and interest. Premium payments have been fully paid
by the Date of Deposit.
 
- -------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------
 
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.
 
- -------------------------------------------------
 
* Insurance relates specifically to the bonds and not to the units or to the
  market value of units. Terms of the insurance are more fully described in the
  prospectus. No representation is made as to the insurer's ability to meet its
  commitments. See Section 5 of the prospectus for details.
 
- -------------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-257-8787
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
 
786
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     CALIFORNIA
     INSURED
     TRUST 243
 
            Estimated Current Return
            5.59% to 5.81%
            as of 02/22/95
 
            Estimated Long Term Return
            5.65% to 5.87%
             40,000 units in a
             diversified $4,000,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  67064U 766 Monthly Payment Option
                  67064U 774 Quarterly Payment Option
                  67064U 782 Semi-Annual Payment Option
 
                  Registered in California
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Philadelphia
New York, New York 10022      Phoenix
Telephone: 212.207.2000       San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--INSURED, CALIFORNIA INSURED TRUST 243
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT FEBRUARY 23, 1995
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $  600,000    California Health Facilities Financing Authority, Kaiser           2003 at 102          AAA           Aaa
                  Permanente, Revenue Bonds, 1993 Series C, 5.60% Due
                  5/1/33.
     600,000    State Public Works Board of the State of California, Lease         2004 at 102          AAA           Aaa
                  Revenue Bonds (Department of Corrections), 1993 Series E
                  (California State Prison-Madera County (II)), 5.50% Due
                  6/1/19.
     500,000    California State University, Fresno Association, Inc.,             2005 at 101          AAA           Aaa
                  Auxiliary Organization Revenue Bonds (Student Residence
                  Project), Series 1995, 6.25% Due 2/1/17.
     600,000    The Regents of the University of California, Refunding             2003 at 102          AAA           Aaa
                  Revenue Bonds (Multiple Purpose Projects), Series B, 6.00%
                  Due 9/1/13.
     600,000    Los Angeles Convention and Exhibition Center Authority             2003 at 102          AAA           Aaa
                  (California), Lease Revenue Bonds, 1993 Refunding Series
                  A, 5.375% Due 8/15/18.
     600,000    Department of Water and Power of The City of Los Angeles           2003 at 102          AAA           Aaa
                  (California), Electric Plant Refunding Revenue Bonds,
                  Issue of 1993, 5.875% Due 9/1/30.
     500,000    Commonwealth of Puerto Rico, Public Improvement Bonds of           2004 at 101          AAA           Aaa
                  1994 (General Obligation Bonds), 6.50% Due 7/1/23.                   1/2
  ----------
  $4,000,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION    The sales charges/volume discounts below
apply on all concurrent purchases of any Nuveen trust units, unless any such
purchases are made by a class of investors for which a separate sales charge is
applicable as described more fully in the Prospectus. Estimated Current Return
equals net income divided by offering price. Estimated Long Term Return
represents an average of the yields to maturity (or call) of the Bonds in the
Trust adjusted to reflect expenses and sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                          Estimated Current Return (2)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-499                 $5,000-$49,999   4.90 %   $    100.53          5.59%            5.62%            5.64%
500-999                 50,000-99,999   4.75          100.37          5.60             5.63             5.65
1,000-2,499           100,000-249,999   4.50          100.10          5.61             5.65             5.67
2,500-4,999           250,000-499,999   4.25           99.84          5.63             5.66             5.68
5,000-9,999           500,000-999,999   3.50           99.07          5.67             5.71             5.72
10,000-24,999     1,000,000- 2,499,999  3.00           98.56          5.70             5.73             5.75
25,000-49,999     2,500,000- 4,999,999  2.50           98.05          5.73             5.76             5.78
50,000 and over    5,000,000 and over   2.00           97.55          5.76             5.79             5.81
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                         Estimated Long Term Return (3)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-499                 $5,000-$49,999   4.90 %   $    100.53          5.65%            5.68%            5.70%
500-999                 50,000-99,999   4.75          100.37          5.66             5.68             5.70
1,000-2,499           100,000-249,999   4.50          100.10          5.67             5.70             5.72
2,500-4,999           250,000-499,999   4.25           99.84          5.69             5.71             5.73
5,000-9,999           500,000-999,999   3.50           99.07          5.73             5.76             5.78
10,000-24,999     1,000,000- 2,499,999  3.00           98.56          5.76             5.79             5.81
25,000-49,999     2,500,000- 4,999,999  2.50           98.05          5.79             5.82             5.84
50,000 and over    5,000,000 and over   2.00           97.55          5.82             5.85             5.87
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to Date of Deposit. The estimated
    current return for purchases made on such date will be as shown, as long as
    the portfolio size and composition remain the same.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                      Normal
                                                                                                  Distributions
California Insured Trust                                          1995                              per Year +
<S>                                     <C>            <C>            <C>            <C>        <C>
- ------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        4/1            5/1            8/1           11/1
Distribution Date.....................       4/15           5/15           8/15          11/15
- ----------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .5931(1)                                              $  5.6205
                                                        --------  $.4683 every month  --------
Quarterly Distribution Plan...........  $   .5931(1)   $   .4710(2)   $  1.4130      $  1.4130    $  5.6525
Semi-Annual Distribution Plan.........  $   .5931(1)   $   .4725(3)                  $  2.8350    $  5.6715
- ----------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The second distribution under the quarterly distribution plan represents a 1-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 1-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.14 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01561 per unit per day.
Consequently, on the first Record Date (04/01/95), accrued interest will total
$0.5931 per unit for the 38-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 04/01/95 is $.5931 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01561              Quarterly - $0.01570
                             Semi-Annual - $0.01575
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
 
                                                          786
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 27.3 years.
The first bond is scheduled to mature in September, 2013, with the last bond
maturity being May, 2033.
 
- -------------------------------------------------------
 
BONDS INSURED BY MBIA   Each bond in this Nuveen Insured series has been
insured* by the Municipal Bond Investors Assurance Corporation, which guarantees
timely payments of principal and interest. Premium payments have been fully paid
by the Date of Deposit.
 
- -------------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------------
 
NO CHARGE FOR REDEMPTION   The Trustee, United States Trust Company of New York,
will redeem units at net asset value. In addition, John Nuveen & Co.
Incorporated intends to maintain a secondary market for this Nuveen Tax-Exempt
Unit Trust. Inasmuch as all securities investments are subject to market price
fluctuation, net asset value at the time of redemption could be more or less
than the initial investment.
 
- -------------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
 
- -------------------------------------------------------
 
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.
 
- -------------------------------------------------------
 
* Insurance relates specifically to the bonds and not to the units or to the
  market value of units. Terms of the insurance are more fully described in the
  prospectus. No representation is made as to the insurer's ability to meet its
  commitments. See Section 5 of the prospectus for details.
 
- -------------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-257-8787
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.


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