NUVEEN TAX EXEMPT UNIT TRUST SERIES 750
497, 1994-09-01
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<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     MASSACHUSETTS
     INSURED
     TRUST 117
 
            Estimated Current Return
            5.61% to 5.83%
            as of 08/30/94
 
            Estimated Long Term Return
            5.68% to 5.90%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  670947 100 Monthly Payment Option
                  670947 118 Quarterly Payment Option
                  670947 126 Semi-Annual Payment Option
 
                  Registered in Massachusetts
                    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, MASSACHUSETTS INSURED TRUST 117
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT AUGUST 31, 1994
- --------------------------------------------------------------------------------
 
<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>
  --------------------------------------------------------------------------------------------------------------------------
  $  185,000    Massachusetts Bay Transportation Authority, General                2003 at 100          AAA           Aaa
                  Transportation System Bonds, 1992 Series B Refunding,
                  5.50% Due 3/1/21. (Original issue discount bonds delivered
                  on or about January 19, 1993 at a price of 89.125% of
                  principal amount.)(General Obligation Bonds.)
     500,000    Massachusetts Health and Educational Facilities Authority,         2002 at 102          AAA           Aaa
                  Revenue Bonds, Children's Hospital Issue, Series E, 6.20%
                  Due 10/1/16.
     500,000    Massachusetts Health and Educational Facilities Authority,         2003 at 102          AAA           Aaa
                  Revenue Bonds, Lahey Clinic Medical Center Issue, Series
                  B, 5.375% Due 7/1/23. (Original issue discount bonds
                  delivered on or about April 27, 1993 at a price of 94.511%
                  of principal amount.)
     500,000    Massachusetts Health and Educational Facilities Authority,         2003 at 102          AAA           Aaa
                  Revenue Bonds, Wellesley College Issue, Series D, 5.375%
                  Due 7/1/19.
     500,000    Massachusetts Housing Finance Agency, Housing Revenue              2004 at 102          AAA           Aaa
                  Refunding Bonds, 1994 Series A, 5.95% Due 12/1/14.
     445,000    Massachusetts Municipal Wholesale Electric Company, Power          2002 at 100          AAA           Aaa
                  Supply System Revenue Bonds, 1992 Series A, 6.00% Due
                  7/1/18. (Original issue discount bonds delivered on or
                  about April 29, 1992 at a price of 88.702% of principal
                  amount.)
     500,000    Massachusetts Water Resources Authority, General Revenue           2002 at 102          AAA           Aaa
                  Refunding Bonds, 1992 Series B, 6.25% Due 11/1/10.
     370,000    Commonwealth of Puerto Rico, Public Improvement Bonds of           2004 at 101          AAA           Aaa
                  1994 (General Obligation Bonds), 6.45% Due 7/1/17.                   1/2
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. 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 %   $    101.05          5.61%            5.64%            5.66%
500-999                 50,000-99,999   4.75          100.89          5.62             5.65             5.67
1,000-2,499           100,000-249,999   4.50          100.63          5.63             5.67             5.69
2,500-4,999           250,000-499,999   4.25          100.37          5.65             5.68             5.70
5,000-9,999           500,000-999,999   3.50           99.59          5.69             5.73             5.74
10,000-24,999     1,000,000-2,499,999   3.00           99.07          5.72             5.76             5.77
25,000-49,999     2,500,000-4,999,999   2.50           98.56          5.75             5.79             5.80
50,000 and over    5,000,000 and over   2.00           98.06          5.78             5.81             5.83
</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 %   $    101.05          5.68%            5.71%            5.73%
500-999                 50,000-99,999   4.75          100.89          5.68             5.71             5.73
1,000-2,499           100,000-249,999   4.50          100.63          5.70             5.73             5.75
2,500-4,999           250,000-499,999   4.25          100.37          5.71             5.74             5.76
5,000-9,999           500,000-999,999   3.50           99.59          5.76             5.79             5.81
10,000-24,999     1,000,000-2,499,999   3.00           99.07          5.79             5.82             5.84
25,000-49,999     2,500,000-4,999,999   2.50           98.56          5.82             5.85             5.87
50,000 and over    5,000,000 and over   2.00           98.06          5.85             5.88             5.90
</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
Massachusetts Insured Trust                       1994                             1995                 per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>
- ----------------------------------------------------------------------------------------------------  --------------
Record Date*..........................       10/1           11/1            2/1            5/1
Distribution Date.....................      10/15          11/15           2/15           5/15
- --------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .4882(1)                                                  $  5.6701
                                                          --------  $.4725 every month  --------
Quarterly Distribution Plan...........  $   .4882(1)   $   .4749(2)   $  1.4247      $  1.4247        $  5.7021
Semi-Annual Distribution Plan.........  $   .4882(1)   $   .4767(3)                  $  2.8602        $  5.7211
- --------------------------------------------------------------------------------------------------------------------
<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 $.11 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 $.01575 per unit per day.
Consequently, on the first Record Date (10/01/94), accrued interest will total
$0.4882 per unit for the 31-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 10/01/94 is $.4882 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01575              Quarterly - $0.01583
                             Semi-Annual - $0.01589
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.
 
- --------------------------------------------------------------------------------
 
                                                          750
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 22.9 years.
The first bond is scheduled to mature in November, 2010, with the last bond
maturity being July, 2023.
 
- -------------------------------------------------------
 
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
<PAGE>
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     NEW YORK
     INSURED
     TRUST 222
 
            Estimated Current Return
            5.57% to 5.79%
            as of 08/30/94
 
            Estimated Long Term Return
            5.67% to 5.89%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  6706H5 734 Monthly Payment Option
                  6706H5 742 Quarterly Payment Option
                  6706H5 759 Semi-Annual Payment Option
 
                  Registered in New York, Connecticut & Florida
                    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, NEW YORK INSURED TRUST 222
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT AUGUST 31, 1994
- --------------------------------------------------------------------------------
 
<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    New York State Energy Research and Development Authority,          2004 at 102          AAA           Aaa
                  Pollution Control Refunding Revenue Bonds (New York State
                  Electric & Gas Corporation Project), 1994 Series A, 6.05%
                  Due 4/1/34.
     500,000    New York Local Government Assistance Corporation, Series           2003 at 102          AAA           Aaa
                  1993B Refunding Bonds, 5.50% Due 4/1/21. (Original issue
                  discount bonds delivered on or about April 6, 1993 at a
                  price of 93.643% of principal amount.)
     475,000    New York State Medical Care, Facilities Finance Agency,            2003 at 102          AAA           Aaa
                  Mental Health Services Facilities Improvement Revenue
                  Bonds, 1993 Series A, 5.80% Due 8/15/22. (General
                  Obligation Bonds.)
     500,000    New York State Urban Development Corporation, Correctional         2003 at 102          AAA           Aaa
                  Capital Facilities Revenue Bonds, 1993 Refunding Series,
                  5.75% Due 1/1/13.
     525,000    City of New Rochelle, Westchester County, New York, General        2004 at 102          AAA           Aaa
                  Obligations, Public Improvement Bonds, 1994 Series B,
                  6.20% Due 8/15/23. (When issued.)
     500,000    The City of New York (New York), General Obligation Bonds,         2003 at 101          AAA           Aaa
                  Fiscal 1994 Series D, 5.75% Due 8/15/14.                             1/2
     500,000    New York City (New York), Municipal Water Finance Authority,       2004 at 101          AAA           Aaa
                  Water and Sewer System Revenue Bonds, Fixed Rate Fiscal
                  1994 Series B, 5.50% Due 6/15/19.
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. 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 %   $     99.92          5.57%            5.60%            5.62%
500-999                 50,000-99,999   4.75           99.76          5.58             5.61             5.63
1,000-2,499           100,000-249,999   4.50           99.50          5.59             5.62             5.64
2,500-4,999           250,000-499,999   4.25           99.24          5.61             5.64             5.66
5,000-9,999           500,000-999,999   3.50           98.47          5.65             5.68             5.70
10,000-24,999     1,000,000-2,499,999   3.00           97.96          5.68             5.71             5.73
25,000-49,999     2,500,000-4,999,999   2.50           97.46          5.71             5.74             5.76
50,000 and over    5,000,000 and over   2.00           96.96          5.74             5.77             5.79
</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 %   $     99.92          5.67%            5.70%            5.72%
500-999                 50,000-99,999   4.75           99.76          5.67             5.70             5.72
1,000-2,499           100,000-249,999   4.50           99.50          5.69             5.72             5.74
2,500-4,999           250,000-499,999   4.25           99.24          5.70             5.73             5.75
5,000-9,999           500,000-999,999   3.50           98.47          5.75             5.78             5.80
10,000-24,999     1,000,000-2,499,999   3.00           97.96          5.78             5.81             5.83
25,000-49,999     2,500,000-4,999,999   2.50           97.46          5.81             5.84             5.86
50,000 and over    5,000,000 and over   2.00           96.96          5.84             5.87             5.89
</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
New York Insured Trust                            1994                             1995                 per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>
- ----------------------------------------------------------------------------------------------------  --------------
Record Date*..........................       10/1           11/1            2/1            5/1
Distribution Date.....................      10/15          11/15           2/15           5/15
- --------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .4789(1)                                                  $  5.5632
                                                          --------  $.4635 every month  --------
Quarterly Distribution Plan...........  $   .4789(1)   $   .4662(2)   $  1.3986      $  1.3986        $  5.5952
Semi-Annual Distribution Plan.........  $   .4789(1)   $   .4677(3)                  $  2.8062        $  5.6142
- --------------------------------------------------------------------------------------------------------------------
<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 $.11 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 $.01545 per unit per day.
Consequently, on the first Record Date (10/01/94), accrued interest will total
$0.4789 per unit for the 31-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 10/01/94 is $.4789 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01545              Quarterly - $0.01554
                             Semi-Annual - $0.01559
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.
 
- --------------------------------------------------------------------------------
 
                                                          750
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 26.6 years.
The first bond is scheduled to mature in January, 2013, with the last bond
maturity being April, 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.
 
- -------------------------------------------------------
 
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
<PAGE>
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     PENNSYLVANIA
     INSURED
     TRUST 186
 
            Estimated Current Return
            First
            Year: 5.53% to 5.76%
            Subsequent
            Years: 5.58% to 5.80%
            as of 08/30/94
 
            Estimated Long Term Return
            5.67% to 5.90%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  6706H9 587 Monthly Payment Option
                  6706H9 595 Quarterly Payment Option
                  6706H9 603 Semi-Annual Payment Option
 
                  Registered in Pennsylvania & Florida
                    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, PENNSYLVANIA INSURED TRUST 186
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT AUGUST 31, 1994
- --------------------------------------------------------------------------------
 
<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    Pennsylvania Intergovernmental Cooperation Authority,              2003 at 100          AAA           Aaa
                  Special Tax Revenue Refunding Bonds (City of Philadelphia
                  Funding Program), Series of 1993A, 5.00% Due 6/15/22.
                  (Original issue discount bonds delivered on or about
                  September 14, 1993 at a price of 92.134% of principal
                  amount.)
     500,000    Dauphin County General Authority, Hospital Revenue Bonds,          2003 at 102          AAA           Aaa
                  HAPSCO Group, Inc. Tax-Exempt Loan Program (The Western
                  Pennsylvania Hospital Project), Fixed Rate Bonds, 1993
                  Series A-1, 5.50% Due 7/1/23.
     500,000    Albert Gallatin Area School District (Fayette County,              2004 at 100          AAA           Aaa
                  Pennsylvania), General Obligation Bonds, Series A of 1994,
                  6.25% Due 9/1/16. (When issued.)
     500,000    Lehigh County Industrial Development Authority, Pollution          2004 at 102          AAA           Aaa
                  Control Revenue Refunding Bonds, 1994 Series A
                  (Pennsylvania Power & Light Company Project), 5.50% Due
                  2/15/27.
     500,000    The Hospitals and Higher Education Facilities Authority of         2003 at 102          AAA           Aaa
                  Philadelphia, Pennsylvania, Hospital Revenue Refunding
                  Bonds (The Children's Hospital of Philadelphia Project),
                  Series A of 1993, 5.375% Due 2/15/14.
     500,000    City of Pittsburgh (Commonwealth of Pennsylvania), General         2004 at 100          AAA           Aaa
                  Obligation Bonds, Series of 1994A, 6.00% Due 9/1/14.
     500,000    Commonwealth of Puerto Rico, Public Improvement Bonds of           2004 at 101          AAA           Aaa
                  1994 (General Obligation Bonds), 6.45% Due 7/1/17.                   1/2
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. 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>       <C>      <C>       <C>
50-499                 $5,000-$49,999   4.90 %   $     98.58     (5.53%)  5.58%     (5.57%)  5.61%     (5.59%)  5.63%
500-999                 50,000-99,999   4.75           98.43     (5.54)   5.59      (5.57)   5.62      (5.59)   5.64
1,000-2,499           100,000-249,999   4.50           98.17     (5.56)   5.60      (5.59)   5.63      (5.61)   5.65
2,500-4,999           250,000-499,999   4.25           97.91     (5.57)   5.62      (5.60)   5.65      (5.62)   5.67
5,000-9,999           500,000-999,999   3.50           97.15     (5.62)   5.66      (5.65)   5.69      (5.67)   5.71
10,000-24,999     1,000,000-2,499,999   3.00           96.65     (5.64)   5.69      (5.68)   5.72      (5.70)   5.74
25,000-49,999     2,500,000-4,999,999   2.50           96.15     (5.67)   5.72      (5.71)   5.75      (5.73)   5.77
50,000 and over    5,000,000 and over   2.00           95.66     (5.70)   5.75      (5.74)   5.78      (5.76)   5.80
</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 %   $     98.58          5.67%            5.71%            5.73%
500-999                 50,000-99,999   4.75           98.43          5.67             5.71             5.73
1,000-2,499           100,000-249,999   4.50           98.17          5.69             5.73             5.75
2,500-4,999           250,000-499,999   4.25           97.91          5.70             5.74             5.76
5,000-9,999           500,000-999,999   3.50           97.15          5.75             5.79             5.81
10,000-24,999     1,000,000-2,499,999   3.00           96.65          5.78             5.82             5.84
25,000-49,999     2,500,000-4,999,999   2.50           96.15          5.81             5.85             5.87
50,000 and over    5,000,000 and over   2.00           95.66          5.84             5.88             5.90
</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 the Date of Deposit. Figures in
    brackets represent the current return. The first year's estimated current
    returns are slightly lower than those for subsequent years because a portion
    of the monies received in the first year only will be treated as a return of
    principal due to the inclusion in the portfolio of "when issued" or other
    Bonds having delivery dates after the date of settlement for a purchase made
    on the Date of Deposit.
(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
Pennsylvania Insured Trust                        1994                             1995                 per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>
- ----------------------------------------------------------------------------------------------------  --------------
Record Date*..........................       10/1           11/1            2/1            5/1
Distribution Date.....................      10/15          11/15           2/15           5/15
- --------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .4733(1)                                                  $  5.4999
                                                          --------  $.4581 every month  --------
Quarterly Distribution Plan...........  $   .4733(1)   $   .4608(2)   $  1.3824      $  1.3824        $  5.5319
Semi-Annual Distribution Plan.........  $   .4733(1)   $   .4623(3)                  $  2.7738        $  5.5509
- --------------------------------------------------------------------------------------------------------------------
<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 $.11 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 $.01527 per unit per day.
Consequently, on the first Record Date (10/01/94), accrued interest will total
$0.4733 per unit for the 31-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 10/01/94 is $.4733 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01527              Quarterly - $0.01536
                             Semi-Annual - $0.01541
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.
 
- --------------------------------------------------------------------------------
 
                                                          750
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 24.8 years.
The first bond is scheduled to mature in February, 2014, with the last bond
maturity being February, 2027.
 
- -------------------------------------------------------
 
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
<PAGE>
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     TENNESSEE
     INSURED
     TRUST 26
 
            Estimated Current Return
            5.45% to 5.67%
            as of 08/30/94
 
            Estimated Long Term Return
            5.56% to 5.79%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  67100U 853 Monthly Payment Option
                  67100U 861 Quarterly Payment Option
                  67100U 879 Semi-Annual Payment Option
 
                  Registered in Tennessee
                    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, TENNESSEE INSURED TRUST 26
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT AUGUST 31, 1994
- --------------------------------------------------------------------------------
 
<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    Commonwealth of Puerto Rico, Public Improvement Bonds of           2004 at 101          AAA           Aaa
                  1994 (General Obligation Bonds), 6.45% Due 7/1/17.                   1/2
     525,000    The Health and Educational Facilities Board of the City of         2003 at 102          AAA           Aaa
                  Bristol, Tennessee, Hospital Revenue Refunding Bonds,
                  Series 1993 (Bristol Memorial Hospital), 5.25% Due 9/1/21.
                  (Original issue discount bonds delivered on or about
                  September 2, 1993 at a price of 94.676% of principal
                  amount.)
     225,000    The Health, Educational and Housing Facilities Board of the        2004 at 102          AAA           Aaa
                  County of Knox (Tennessee), Hospital Revenue Bonds, Series
                  1993-A (Fort Sanders Alliance Obligated Group), 5.25% Due
                  1/1/23.
     500,000    Knox-Chapman Utility District of Knox County, Tennessee,           2004 at 102          AAA           Aaa
                  Water and Sewer Revenue Refunding Bonds, Series 1994,
                  6.00% Due 1/1/14.
     500,000    Memphis-Shelby County Airport Authority (Tennessee), Airport       2003 at 102          AAA           Aaa
                  Revenue Refunding Bonds, Series 1993, 5.65% Due 9/1/15.
     250,000    The Metropolitan Government of Nashville and Davidson County       2002 at 102          AAA           Aaa
                  (Tennessee), Electric System Revenue Bonds, 1992 Series A,
                  6.00% Due 5/15/12.
     500,000    The Metropolitan Government of Nashville and Davidson County       No Optional          AAA           Aaa
                  (Tennessee), Water and Sewer Revenue Refunding Bonds,               Call
                  Series 1993, 5.20% Due 1/1/13.
     500,000    The Health, Educational and Housing Facility Board of the          2003 at 102          AAA           Aaa
                  County of Shelby, Tennessee, Revenue Bonds, Series D
                  (LeBonheur Children's Medical Center, Inc.), 5.50% Due
                  8/15/12.
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. 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 %   $     99.80          5.45%            5.48%            5.50%
500-999                 50,000-99,999   4.75           99.64          5.46             5.49             5.51
1,000-2,499           100,000-249,999   4.50           99.38          5.47             5.51             5.52
2,500-4,999           250,000-499,999   4.25           99.12          5.49             5.52             5.54
5,000-9,999           500,000-999,999   3.50           98.35          5.53             5.56             5.58
10,000-24,999     1,000,000-2,499,999   3.00           97.85          5.56             5.59             5.61
25,000-49,999     2,500,000-4,999,999   2.50           97.34          5.59             5.62             5.64
50,000 and over    5,000,000 and over   2.00           96.85          5.62             5.65             5.67
</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 %   $     99.80          5.56%            5.60%            5.62%
500-999                 50,000-99,999   4.75           99.64          5.57             5.61             5.63
1,000-2,499           100,000-249,999   4.50           99.38          5.59             5.63             5.64
2,500-4,999           250,000-499,999   4.25           99.12          5.60             5.64             5.66
5,000-9,999           500,000-999,999   3.50           98.35          5.65             5.68             5.70
10,000-24,999     1,000,000-2,499,999   3.00           97.85          5.68             5.71             5.73
25,000-49,999     2,500,000-4,999,999   2.50           97.34          5.70             5.74             5.76
50,000 and over    5,000,000 and over   2.00           96.85          5.73             5.77             5.79
</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
Tennessee Insured Trust                           1994                             1995                 per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>
- ----------------------------------------------------------------------------------------------------  --------------
Record Date*..........................       10/1           11/1            2/1            5/1
Distribution Date.....................      10/15          11/15           2/15           5/15
- --------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .4681(1)                                                  $  5.4389
                                                          --------  $.4530 every month  --------
Quarterly Distribution Plan...........  $   .4681(1)   $   .4557(2)   $  1.3671      $  1.3671        $  5.4709
Semi-Annual Distribution Plan.........  $   .4681(1)   $   .4572(3)                  $  2.7432        $  5.4899
- --------------------------------------------------------------------------------------------------------------------
<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 $.11 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 $.01510 per unit per day.
Consequently, on the first Record Date (10/01/94), accrued interest will total
$0.4681 per unit for the 31-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 10/01/94 is $.4681 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01510              Quarterly - $0.01519
                             Semi-Annual - $0.01524
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.
 
- --------------------------------------------------------------------------------
 
                                                          750
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 21.3 years.
The first bond is scheduled to mature in May, 2012, with the last bond maturity
being January, 2023.
 
- -------------------------------------------------------
 
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
<PAGE>
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.


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