<PAGE>
NUVEEN NATIONAL NUVEEN
INSURED UNIT TRUST 340 926
- --------------------------------------------------------------------------------
<TABLE>
<S> <C>
RATED: "AAA" NUVEEN TAX-FREE UNIT TRUSTS:
All bonds in this Unit Trust are insured by MBIA For the tax-sensitive, conservative investor.
Insurance Corporation. As a result, the bonds are - Tax-Free
rated Aaa by Moody's Investors Service, Inc. and - Dependable Income
both the bonds and the Units are rated AAA by - Diversified Portfolios
Standard & Poor's, the highest rating given by - Top-Rated Municipal Bonds
each agency. DATE OF DEPOSIT: March 18, 1997
ESTIMATED CURRENT RETURN:
5.26 - 5.47%
ESTIMATED LONG-TERM RETURN:
5.33 - 5.59%
</TABLE>
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 FDIC OR
ANY OTHER FEDERAL AGENCY AND INVOLVE INVESTMENT RISK, INCLUDING THE POSSIBLE
LOSS OF PRINCIPAL.
- --------------------------------------------------------------------------------
QUICK FACTS ABOUT THIS UNIT TRUST
<TABLE>
<S> <C>
Tax Status Income is exempt from federal income tax but may
be subject to state and local tax. Capital gains
are taxable.
Total Principal $7,500,000 in 75,000 units
Average Life 27.3 years
Call Protection Earliest ordinary optional call is 2005
Minimum $5,000 or 50 units, whichever is lower
Investment
Offering Price $100.78 to $97.80 depending on the purchase amount
Cusip 6710A5 618 monthly payment plan
Numbers 6710A5 626 quarterly payment plan
6710A5 634 semi-annual payment plan
Insurance Individual bonds (not units) are fully insured by
MBIA Insurance Corporation, which guarantees
timely payment of interest and principal.
Registration Registered in all states
</TABLE>
<TABLE>
<S> <C>
Payment Investors may choose to receive monthly, quarterly
Plans or semi-annual interest payments.
Bond Calls Most municipal bonds are subject to optional bond
calls. Bonds are usually called at a premium price
and generally not below par value.
Sales Charge The sales charge is a one-time expense included in
the Public Offering Price.
Letter Investors may use a Letter of Intent to get
of Intent reduced sales charges on purchases made over a
(LOI) 13-month period (and to take advantage of dollar
cost averaging). Minimum LOI investment $50,000.
Redemptions Units can be redeemed on any business day at no
charge. Units are redeemed at their current market
value.
Reinvestment Interest income and returned principal can be
reinvested with no sales charge into Nuveen tax-
free mutual or money market funds. For more
information obtain a prospectus.
</TABLE>
- --------------------------------------------------------------------------------
PORTFOLIO INCOME DIVERSIFICATION
<TABLE>
<S> <C> <C> <C> <C> <C> <C> <C> <C>
Alabama 10.4 % Colorado 10.3 % Illinois 6.8 %
Indiana 10.3 New Hampshire 10.4 New York 10.4
Oklahoma 10.4 Washington D.C. 10.2 Wisconsin 20.8
</TABLE>
<TABLE>
<S> <C>
MATURITY DATES (Description of Chart)
2017-19 13.3%
2020-22 16.7%
2023-25 20.0%
</TABLE>
<PAGE>
<TABLE>
<S> <C>
2026+ 50.0%
The earliest ordinary optional call date is 2005
YIELD COMPARISON AS OF 03/17/97*
(Description of Yield Comparison Chart)
Nuveen UIT
Yield 5.26%
Tax Equivalent Yield 8.22%
Treasury Bonds
Yield 6.94%
Tax Equivalent Yield 7.31%
Corporate Bonds
Yield 7.74%
</TABLE>
*COMPARES TRUST AS OF 03/17/97 WITH 30-YEAR TREASURY BONDS AND LEHMAN BROTHERS
INVESTMENT GRADE LONG CORPORATE BOND INDEX AS OF 03/14/97. ASSUMES 36.0%
FEDERAL AND 5.0% STATE INCOME TAX RATES. TREASURY BONDS ARE SUBJECT TO FEDERAL
BUT NOT STATE INCOME TAXES; CORPORATE BONDS ARE GENERALLY SUBJECT TO BOTH.
TREASURY BONDS, UNLIKE MUNICIPAL BONDS, ARE GUARANTEED BY THE U.S. GOVERNMENT.
CALL 1.800.257.8787 FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION
INCLUDING CHARGES AND EXPENSES.
READ THE PROSPECTUS CAREFULLY BEFORE INVESTING.
<PAGE>
- --------------------------------------------------------------------------------
BONDS THIS NATIONAL INSURED UNIT TRUST CONTAINS
<TABLE>
<CAPTION>
RATINGS
PRINCIPAL EARLIEST CALL ----------
AMOUNT BOND ISSUE DATE AND PRICE S&P MOODY'S
<C> <S> <C> <C><C>
----------------------------------------------------------------------------------------------------------------
$ 750,000 Jefferson County, Alabama, Sewer Revenue Warrants, Series 1997-D, 5.75% Due AAA Aaa
2/1/22. (When issued.) 2007 at 101
750,000 City and County of Denver, Colorado, Airport System Revenue Bonds, Series AAA Aaa
1995A, 5.70% Due 11/15/25. 2005 at 102
750,000 District of Columbia, University Revenue Bonds (American University Issue), AAA Aaa
Series 1996, 5.625% Due 10/1/26. 2006 at 101
500,000 Chicago Park District, Illinois, General Obligation Unlimited Tax Park AAA Aaa
Bonds, Series 1996 (Personal Property Replacement Tax Alternate Revenue
Source), 5.60% Due 1/1/21. 2007 at 101
250,000 Metropolitan Pier and Exposition Authority (Illinois), McCormick Place AAA Aaa
Expansion Project Refunding Bonds, Series 1996A, 0.00% Due 12/15/17.
(Original issue discount bonds delivered on or about October 8, 1996 at a
price of 27.711% of principal amount.) No Optional
Call
750,000 Riley Elementary School Building Corporation (Vigo County, Indiana), First AAA Aaa
Mortgage Bonds, Series 1996, 5.70% Due 1/15/18. (General Obligation Bonds.) 2006 at 102
750,000 New Hampshire Higher Educational and Health Facilities Authority, Revenue AAA Aaa
Bonds, Saint Anselm College Issue, Series 1996, 5.75% Due 7/1/26. 2006 at 102
750,000 New York City (New York), Municipal Water Finance Authority, Water and AAA Aaa
Sewer System Revenue Bonds, Fiscal 1996 Series B, 5.75% Due 6/15/26.
(Original issue discount bonds delivered on or about May 16, 1996 at a
price of 93.892% of principal amount.) 2006 at 101
750,000 Tulsa Metropolitan Utility Authority (Tulsa, Oklahoma), Utility Revenue AAA Aaa
Bonds, Series 1995, 5.75% Due 9/1/25. 2005 at 102
750,000 Wisconsin Health and Educational Facilities Authority, Revenue Bonds, AAA Aaa
Series 1996 (The Medical College of Wisconsin, Inc. Project), 5.50% Due
12/1/26. 2006 at 102
750,000 Wisconsin Health and Educational Facilities Authority, Revenue Bonds, AAA Aaa
Series 1996 (Meriter Hospital, Inc.), 6.00% Due 12/1/26. 2006 at 102
----------------------------------------------------------------------------------------------------------------
$ 7,500,000 TOTAL 10 BONDS FROM 8 STATES AND ONE BOND FROM THE DISTRICT OF COLUMBIA.
</TABLE>
- --------------------------------------------------------------------------------
HOW TO DETERMINE YOUR INCOME AND YIELD
HOW TO CALCULATE YOUR RETURN
<TABLE>
<S> <C>
The estimated current return is the net income the sales charge, and returns are as of 03/17/97.
divided by the offering price. Estimated long-term As of this date, Units are offered at the public
return is a measure of the return to the investor offering price plus accrued interest to the
expected to be earned over the estimated life of settlement date of $.04. Returns and prices will
the Unit Trust. The public offering prices, which fluctuate.
include
</TABLE>
<TABLE>
<CAPTION>
Public Estimated Return (CURRENT/Long Term)
Breakpoints Offering Sales -------------------------------------------------
Units / Dollars Price Charge Monthly Plan Quarterly Plan Semi-Annual Plan
<S> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C>
50 / $5,000 $ 100.78 4.90 % 5.26% 5.33% 5.29% 5.35% 5.31% 5.37 %
500 / $50,000 100.62 4.75 5.27 5.33 5.30 5.36 5.32 5.38
1,000 / $100,000 100.36 4.50 5.28 5.35 5.31 5.38 5.33 5.40
2,500 / $250,000 100.09 4.25 5.29 5.37 5.32 5.40 5.34 5.42
5,000 / $500,000 99.32 3.50 5.33 5.43 5.37 5.46 5.39 5.48
10,000 / $1,000,000 98.80 3.00 5.36 5.47 5.39 5.50 5.41 5.52
25,000 / $2,500,000 98.30 2.50 5.39 5.50 5.42 5.53 5.44 5.55
50,000 / $5,000,000 97.80 2.00 5.42 5.54 5.45 5.57 5.47 5.59
</TABLE>
HOW TO DETERMINE YOUR
TAXABLE EQUIVALENT YIELD
The table shows the approximate yield an investor must get from a taxable
investment to match the estimated current return from this Unit Trust.
<TABLE>
<CAPTION>
Taxable Equivalent Yield (by
UNIT TRUST tax bracket)
RETURN 28.0% 31.0% 36.0% 39.6%
<C> <S> <C> <C> <C> <C>
5.26 % 7.31% 7.62% 8.22% 8.71%
5.27 7.32 7.64 8.23 8.73
5.28 7.33 7.65 8.25 8.74
5.29 7.35 7.67 8.27 8.76
5.33 7.40 7.72 8.33 8.82
5.36 7.44 7.77 8.38 8.87
5.39 7.49 7.81 8.42 8.92
5.42 7.53 7.86 8.47 8.97
</TABLE>
JOHN NUVEEN & CO. INCORPORATED
333 WEST WACKER DRIVE, CHICAGO, IL 60606
HOW TO CALCULATE YOUR INCOME
The table shows expected interest payments for monthly, quarterly and
semi-annual plans. Payments will remain relatively constant as long as the Unit
Trust's size, composition and expenses remain the same. The first record date is
05/01/97.
<TABLE>
<CAPTION>
Annual
First Payment Payment Income
Payment Plan Date (per unit) (per unit)
<S> <C> <C> <C> <C>
Initial partial
payment (all
plans) 5/15/97 $ .6325
Monthly plan 6/15/97 .4413 $ 5.2976
Quarterly plan 8/15/97 1.3320
11/15/97 1.3320 5.3296
Semi-annual plan 11/15/97 2.6730
5/15/98 2.6730 5.3486
EXAMPLE OF HOW TO CALCULATE YOUR ESTIMATED INCOME:
$10,000 DIVIDED BY 100.82 = 99.186
investment offering price # of units
(as of and accrued purchased
03/17/97) interest
99.186 X $5.2976 = $525.45
# of units annual income annual income
purchased per unit
(monthly plan)
</TABLE>
