DEAN WITTER NATIONAL MUNICIPAL TRUST
497, 1995-12-06
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<PAGE>
                                                Filed Pursuant to Rule 497(e)
                                                Registration File No.: 33-53015




<PAGE>
DEAN WITTER
NATIONAL MUNICIPAL TRUST

PROSPECTUS --NOVEMBER 22, 1995
- ------------------------------------------------------------------------------

Dean Witter National Municipal Trust (the "Fund") is an open-end diversified
management investment company whose investment objective is to provide a high
level of current income exempt from federal income tax, consistent with the
preservation of capital. The Fund invests principally in tax-exempt
fixed-income securities which are rated in the three highest categories by
Moody's Investors Service, Inc. or Standard & Poor's Corporation. (See
"Investment Objective and Policies.")

Shares of the Fund are continuously offered at net asset value. However,
redemptions and/or repurchases are subject in most cases to a contingent
deferred sales charge, scaled down from 3% to 1% of the amount redeemed, if
made within three years of purchase, which charge will be paid to the Fund's
Distributor, Dean Witter Distributors Inc. See "Redemptions and Repurchases--
Contingent Deferred Sales Charge." In addition, the Fund pays the Distributor
a distribution fee pursuant to a Plan of Distribution at the annual rate of
0.60% of the lesser of the (i) average daily aggregate net sales or (ii)
average daily net assets of the Fund. See "Purchase of Fund Shares--Plan of
Distribution."

This Prospectus sets forth concisely the information you should know before
investing in the Fund. It should be read and retained for future reference.
Additional information about the Fund is contained in the Statement of
Additional Information, dated November 22, 1995, which has been filed with
the Securities and Exchange Commission, and which is available at no charge
upon request of the Fund at the address or telephone numbers listed below.
The Statement of Additional Information is incorporated herein by reference.

TABLE OF CONTENTS

Prospectus Summary ....................................................      2
Summary of Fund Expenses ..............................................      3
Financial Highlights ..................................................      4
The Fund and its Management ...........................................      5
Investment Objective and Policies .....................................      5
 Risk Considerations and Investment Practices .........................      7
Investment Restrictions ...............................................      9
Purchase of Fund Shares ...............................................     10
Shareholder Services ..................................................     12
Redemptions and Repurchases ...........................................     14
Dividends, Distributions and Taxes ....................................     15
Performance Information ...............................................     17
Additional Information ................................................     17

Shares of the Fund are not deposits or obligations of, or guaranteed or
endorsed by, any bank, and the shares are not federally insured by the
Federal Deposit Insurance Corporation, the Federal Reserve Board, or any
other agency.

DEAN WITTER
NATIONAL MUNICIPAL TRUST
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
(212) 392-2550 OR
(800) 869-NEWS (TOLL FREE)

THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS
A CRIMINAL OFFENSE.

                    Dean Witter Distributors Inc., Distributor




     
<PAGE>

PROSPECTUS SUMMARY
- -----------------------------------------------------------------------------

<TABLE>
<CAPTION>
<S>                 <C>
The                 The Fund is organized as a Trust, commonly known as a Massachusetts business trust, and is an open-end
Fund                diversified management investment company investing principally in investment grade, tax-exempt fixed-income
                    securities (see page 4).
- ------------------  ---------------------------------------------------------------------------------------------------
Shares Offered      Shares of beneficial interest with $0.01 par value (see page 17).
- ------------------  ---------------------------------------------------------------------------------------------------
Offering            At net asset value (see page 10). Shares redeemed within three years of purchase are subject to a contingent
Price               deferred sales charge under most circumstances (see pages 14-15).
- ------------------  ---------------------------------------------------------------------------------------------------
Minimum             Minimum initial purchase is $1,000; minimum subsequent purchase is $100 (see page 10).
Purchase
- ------------------  ---------------------------------------------------------------------------------------------------
Investment          The investment objective of the Fund is to provide a high level of current income exempt from federal
Objective           income tax, consistent with the preservation of capital (see page 5).
- ------------------  ---------------------------------------------------------------------------------------------------
Investment          Dean Witter InterCapital Inc. ("InterCapital"), the Investment Manager of the Fund, and its wholly-owned
Manager             subsidiary, Dean Witter Services Company Inc., serve in various investment management, advisory, management
                    and administrative capacities to ninety-six investment companies and other portfolios with assets of
                    approximately $76.9 billion at October 31, 1995 (see page 5).
- ------------------  ---------------------------------------------------------------------------------------------------
Management          The monthly fee is at an annual rate of 0.35% of average daily net assets (see page 5).
Fee
- ------------------  ---------------------------------------------------------------------------------------------------
Dividends and       Income dividends are declared daily and paid monthly; capital gains, if any, may be distributed annually
Capital Gains       or retained for reinvestment by the Fund. Dividends and distributions are automatically reinvested in
Distributions       additional shares at net asset value (without sales charge), unless the shareholder elects to receive
                    cash (see page 15).
- ------------------  ---------------------------------------------------------------------------------------------------
Distributor         Dean Witter Distributors Inc. (the "Distributor"). For its services as Distributor, which include payment
                    of sales commissions to account executives and various other promotional and sales related expenses,
                    the Distributor receives from the Fund a distribution fee accrued daily and payable monthly at the rate
                    of 0.60% per annum of the lesser of (i) the Fund's average daily aggregate net sales or (ii) the Fund's
                    average daily net assets. This fee compensates the Distributor for the services it provides in distributing
                    shares of the Fund and for its sales related expenses. The Distributor also receives the proceeds of
                    any contingent deferred sales charges (see pages 10-11).
- ------------------  ---------------------------------------------------------------------------------------------------
Redemption--        At net asset value; redeemable involuntarily if total value of the account is less than $100. Although
Contingent          no commission or sales load is imposed upon the purchase of shares, a contingent deferred sales charge
Deferred            (scaled down from 3% to 1%) is imposed on any redemption of shares if after such redemption the aggregate
Sales               current value of an account with the Fund falls below the aggregate amount of the investor's purchase
Charge              payments made during the three years preceding the redemption. However, there is no charge imposed on
                    redemption of shares purchased through reinvestment of dividends or distributions (see pages 14-15).
- ------------------  ---------------------------------------------------------------------------------------------------
Risks               The value of the Fund's portfolio securities, and therefore the Fund's net asset value per share, may
                    increase or decrease due to various factors, principally changes in prevailing interest rates and the
                    ability of the issuers of the Fund's portfolio securities to pay interest and principal on such obligations.
                    The Fund may purchase when-issued and delayed delivery securities (see page 7). The Fund may invest in
                    lease obligations and variable rate obligations which may entail additional risks (see pages 6-7). The
                    Fund may also invest in futures and options, which may be considered speculative in nature and which
                    may involve greater risks than those customarily assumed by certain other investment companies which
                    do not invest in such instruments (see pages 7-8).
- ------------------  ---------------------------------------------------------------------------------------------------
</TABLE>

The above is qualified in its entirety by the detailed information appearing
                         elsewhere in the Prospectus
               and in the Statement of Additional Information.

                                2



     
<PAGE>

SUMMARY OF FUND EXPENSES
- -----------------------------------------------------------------------------

   The following table illustrates all expenses and fees that a shareholder
of the Fund will incur. The expenses and fees set forth are for the fiscal
year ended September 30, 1996.

<TABLE>
<CAPTION>
<S>                                                                                    <C>
 SHAREHOLDER TRANSACTION EXPENSES
Maximum Sales Charge Imposed on Purchases ............................................ None
Maximum Sales Charge Imposed on Reinvested Dividends ................................. None
Contingent Deferred Sales Charge ..................................................... None
 (as a percentage of the lesser of original purchase price or redemption proceeds)  .. 3.0%
</TABLE>

   A contingent deferred sales charge is imposed at the following declining
rates:

<TABLE>
<CAPTION>
 YEAR SINCE PURCHASE PAYMENT MADE       PERCENTAGE
- -----------------------------------  --------------
<S>                                  <C>
First .............................. 3.0%
Second ............................. 2.0%
Third .............................. 1.0%
Fourth and thereafter .............. None

</TABLE>

<TABLE>
<CAPTION>
<S>                                                                        <C>
 Redemption Fees ..........................................................None
Exchange Fee ............................................................. None
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
Management Fees* ......................................................... 0.08%
12b-1 Fees** ............................................................. 0.60%
Other Expenses* .......................................................... 0.29%
Total Fund Operating Expenses* ........................................... 0.97%
<FN>
- ------------

"Management Fees" (after fee waiver), "12b-1 fees" and "Other Expenses"
(after expense assumptions) as shown above are based upon estimated amounts
of management fees, 12b-1 fees and other expenses of the Fund for the fiscal
year ending September 30, 1996.

   *    The Investment Manager has undertaken to assume all expenses (except
        for any brokerage and 12b-1 fees) and to waive the compensation
        provided for in its Management Agreement until December 31, 1995,
        and, from January 1, 1996 through December 31, 1996, has undertaken
        to waive management fees and assume expenses (except for brokerage
        and 12b-1 fees) to the extent they exceed 0.50% of the daily net
        assets of the Fund. For the fiscal year ended September 30, 1995, the
        Fund's total operating expenses, consisting only of 12b-1 fees,
        amounted to 0.60% of the Fund's daily net assets.

   **   The 12b-1 fee is accrued daily and payable monthly, at an annual rate
        of 0.60% of the lesser of: (a) the average daily aggregate gross
        sales of the Fund's shares since the inception of the Fund (not
        including reinvestments of dividends or distributions), less the
        average daily aggregate net asset value of the Fund's shares redeemed
        since the Fund's inception upon which a contingent deferred sales
        charge has been imposed or waived, or (b) the Fund's average daily
        net assets. A portion of the 12b-1 fee equal to 0.15% of the Fund's
        average daily net assets is characterized as a service fee within the
        meaning of National Association of Securities Dealers, Inc. ("NASD")
        guidelines (see "Purchase of Fund Shares").
</TABLE>

<TABLE>
<CAPTION>
 EXAMPLE                                                         1 YEAR    3 YEARS    5 YEARS    10 YEARS
- -------------------------------------------------------------  --------  ---------  ---------  ----------
<S>                                                            <C>       <C>        <C>        <C>
You would pay the following expenses on a $1,000 investment,
 assuming (1) 5% annual return and (2) redemption at the end
 of
 each time period ............................................ $40       $41        $54        $54
You would pay the following expenses on the investment,
 assuming no redemption ...................................... $10       $31        $119       $119
</TABLE>

   THE ABOVE EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR
FUTURE EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF THE FUND MAY BE GREATER OR
LESS THAN THOSE SHOWN.

   It is estimated that Total Fund Operating Expenses for the Fund for the
fiscal year ending September 30, 1996, assuming no waiver of management fees
or assumption of expenses would be:



     
<TABLE>
<CAPTION>
<S>                               <C>
 Management Fees ...............  0.35%
12b-1 Fees ....................   0.60%
Other Expenses ................   0.39%
Total Fund Operating Expenses     1.34%
</TABLE>

   The purpose of this table is to assist the investor in understanding the
various costs and expenses that an investor in the Fund will bear directly or
indirectly. For a more complete description of these costs and expenses, see
"The Fund and its Management," "Plan of Distribution" and "Redemptions and
Repurchases."

   Long-term shareholders of the Fund may pay more in sales charges and
distribution fees than the economic equiv- alent of the maximum front-end
sales charges permitted by the NASD.

                                3



     
<PAGE>

FINANCIAL HIGHLIGHTS
- -----------------------------------------------------------------------------

The following ratios and per share data for a share of beneficial interest
outstanding throughout each period have been audited by Price Waterhouse LLP,
independent accountants. The financial highlights should be read in
conjunction with the financial statements, notes thereto and the unqualified
report of the independent accountants which are contained in the Statement of
Additional Information.

<TABLE>
<CAPTION>
                                                                      FOR THE PERIOD
                                                                      JUNE 2, 1994*
                                                FOR THE YEAR ENDED  THROUGH SEPTEMBER
                                                SEPTEMBER 30, 1995       30, 1994
                                               ------------------  ------------------
<S>                                            <C>                 <C>
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period  ........ $ 9.87              $10.00
                                               ------------------  ------------------
Net investment income ........................   0.50                0.09
Net realized and unrealized gain (loss)  .....   0.52               (0.13)
                                               ------------------  ------------------
Total from investment operations .............   1.02               (0.04)
Dividends from net investment income  ........  (0.50)              (0.09)
                                               ------------------  ------------------
Net asset value, end of period ............... $10.39              $ 9.87
                                               ==================  ==================
TOTAL INVESTMENT RETURN + ....................  10.54%              (0.46)%(1)
RATIOS TO AVERAGE NET ASSETS:
Expenses .....................................   0.60%(4)            0.60%(2)(3)
Net investment income ........................   4.93%(4)            3.07%(2)(3)
SUPPLEMENTAL DATA:
Net asset value, end of period, in thousands   $64,276            $29,860
Portfolio turnover rate ......................      2%                 --%
<FN>
- ------------

*   Commencement of operations.
   +    Does not reflect the deduction of sales charge.
   (1)  Not annualized.
   (2)  Annualized.
   (3)  If the Fund had borne all expenses that were assumed or waived by the
        Investment Manager, the above annualized expense and net investment
        income ratios would have been 2.08% and 1.59%, respectively.
   (4)  If the Fund had borne all expenses that were assumed or waived by the
        Investment Manager, the above expense and net investment income
        ratios would have been 1.34% (which includes 0.01% gross-up for
        custody cash credits) and 4.20%, respectively.
</TABLE>

                                4



     
<PAGE>

THE FUND AND ITS MANAGEMENT
- -----------------------------------------------------------------------------

   Dean Witter National Municipal Trust (the "Fund") is an open-end
diversified management investment company. The Fund is a trust of the type
commonly known as a "Massachusetts business trust" and was organized under
the laws of the Commonwealth of Massachusetts on March 29, 1994.

   Dean Witter InterCapital Inc. ("InterCapital" or the "Investment
Manager"), whose address is Two World Trade Center, New York, New York 10048,
is the Fund's Investment Manager. The Investment Manager, which was
incorporated in July, 1992, is a wholly-owned subsidiary of Dean Witter,
Discover & Co. ("DWDC"), a balanced financial services organization providing
a broad range of nationally marketed credit and invest- ment products.

   InterCapital and its wholly-owned subsidiary, Dean Witter Services Company
Inc., serve in various investment management, advisory, management and
administrative capacities to a total of ninety-six investment companies,
thirty of which are listed on the New York Stock Exchange, with combined
total net assets of approximately $74.5 billion as of October 31, 1995. The
Investment Manager also manages portfolios of pension plans, other
institutions and individuals which aggregated approximately $2.4 billion at
such date.

   The Fund has retained the Investment Manager to provide administrative
services, manage its business affairs and manage the investment of the Fund's
assets, including the placing of orders for the purchase and sale of
portfolio securities. InterCapital has retained Dean Witter Services Company
Inc. to perform the aforementioned administrative services for the Fund. The
Fund's Trustees review the various services provided by or under the
direction of the Investment Manager to ensure that the Fund's general
investment policies and programs are being properly carried out and that
administrative services are being provided to the Fund in a satisfactory
manner.

   As full compensation for the services and facilities furnished to the Fund
and for expenses of the Fund assumed by the Investment Manager, the Fund pays
the Investment Manager monthly compensation calculated daily at the annual
rate of 0.35% of the daily net assets of the Fund.

   The Fund's expenses include: the fee of the Investment Manager; taxes;
certain legal, transfer agent, custodian and auditing fees; and printing and
other expenses relating to the Fund's operations which are not expressly
assumed by the Investment Manager under its Investment Management Agreement
with the Fund. The Investment Manager has undertaken to assume all expenses
(except for brokerage and 12b-1 fees) and waive the compensation provided for
in its Investment Management Agreement until December 31, 1995, and, from
January 1, 1996 through December 31, 1996, has undertaken to waive management
fees and expenses (except for brokerage and 12b-1 fees) to the extent they
exceed 0.50% of the daily net assets of the Fund.




     
INVESTMENT OBJECTIVE AND POLICIES
- -----------------------------------------------------------------------------

   The investment objective of the Fund is to provide a high level of current
income which is exempt from federal income tax, consistent with the
preservation of capital. There is no assurance that this objective will be
achieved. This objective is fundamental and may not be changed without
shareholder approval. The Fund seeks to achieve its investment objective by
investing its assets in accordance with the following policies:

       1. At least 75% of the Fund's total assets will be invested in: (a)
    Municipal Bonds which are rated at the time of purchase within the three
    highest grades by Moody's Investors Service, Inc. ("Moody's") or Standard
    & Poor's Corporation ("S&P"); (b) Municipal Notes which at the time of
    purchase are rated in the two highest grades by Moody's or S&P or, if not
    rated, have outstanding one or more issues of Municipal Bonds rated as set
    forth in clause (a) of this paragraph; and (c) Municipal Commercial Paper
    which at the time of purchase are rated P-1 by Moody's and A-1 by S&P.

       2. The Fund may invest up to 25% of its total assets in Municipal
    Obligations which are unrated or, if rated, are not within the three
    highest Bond rating categories of Moody's or S&P or the two highest Note
    rating categories of Moody's or S&P. The Fund does not intend to invest in
    Municipal Bonds which are rated below either Baa by Moody's or BBB by S&P
    (the lowest ratings considered investment grade) or, if not rated, are
    deemed by the Investment Manager to be below investment grade, in amounts
    exceeding 5% of its net assets.

       Investments in Municipal Bonds rated either Baa by Moody's or BBB by
    S&P have speculative characteristics

                                5



     
<PAGE>

    and, therefore, changes in economic conditions or other circumstances are
    more likely to weaken their capacity to make principal and interest
    payments than would be the case with investments in securities with higher
    credit ratings. Municipal Bonds rated below investment grade may not
    currently be paying any interest and may have extremely poor prospects of
    ever attaining any real investment standing. Any subsequent change in any
    rating of any security below investment grade which causes the Fund to be
    invested in such securities in an amount exceeding 5% of its net assets
    will result in the elimination of that security from the Fund's portfolio
    as soon as practicable without adverse market or tax consequences to the
    Fund.

       3. Certain Municipal Obligations in which the Fund may invest without
    limit may subject certain investors to the alternative minimum tax and,
    therefore, a substantial portion of the income produced by the Fund may be
    taxable for such investors under the alternative minimum tax. The Fund,
    therefore, may not ordinarily be a suitable investment for investors who
    are subject to the alternative minimum tax. The suitability of the Fund
    for these investors will depend upon a comparison of the after-tax yield
    likely to be provided from the Fund to comparable tax-exempt investments
    not subject to such tax and also to comparable fully taxable investments
    in light of each such investor's tax position. See "Dividends,
    Distributions and Taxes."

       4. Up to 25% of the Fund's total assets may be invested in taxable
    money market instruments under any one or more of the following
    circumstances: (a) pending investment of proceeds of sale of Fund shares
    or of portfolio securities; (b) pending settlement of purchases of
    portfolio securities; and (c) to maintain liquidity for the purpose of
    meeting anticipated redemptions. In addition, the Fund may temporarily
    invest more than 25% of its total assets in taxable securities to maintain
    a "defensive" posture when, in the opinion of the Investment Manager, it
    is advisable to do so because of market conditions. The types of taxable
    securities in which the Fund may temporarily invest are limited to the
    following short-term fixed-income securities (maturing in one year or less
    from the time of purchase): (i) obligations of the United States
    Government, its agencies, instrumentalities or authorities; (ii)
    commercial paper rated P-1 by Moody's or A-1 by S&P; (iii) certificates of
    deposit of domestic banks with assets of $1 billion or more; and (iv)
    repurchase agreements with respect to any of the foregoing portfolio
    securities.

   The average dollar weighted maturity of the Fund's portfolio under normal
circumstances is expected to be in excess of 20 years, but the average
maturity, as well as the emphasis on longer-term obligations, may vary
depending upon market conditions.

   Municipal Obligations are debt obligations of states, cities,
municipalities and municipal agencies which generally have maturities, at the
time of their issuance, of either one year or more (Bonds) or from six months
to three years (Notes). Municipal Commercial Paper refers to short-term
obligations of municipalities. Any Municipal Obligation which depends
directly or indirectly on the credit of the Federal Government shall be
considered to have a rating of Aaa/AAA. The Fund may also purchase Municipal
Obligations which had originally been issued by the same issuer as two
separate series of the same issue with different interest rates, but which
are now linked together to form one series.



     

   The two principal classifications of Municipal Obligations and Commercial
Paper are "general obligation" and "revenue" obligations or commercial paper.
General obligation bonds, notes or commercial paper are secured by the
issuer's pledge of its faith, credit and taxing power for the payment of
principal and interest. Issuers of general obligation bonds, notes or
commercial paper include a state, its counties, cities, towns and other
government units. Revenue bonds, notes or commercial paper are payable from
the revenues derived from a particular facility or class of facilities or, in
some cases, from specific revenue sources. Revenue bonds, notes or commercial
paper are issued for a wide variety of purposes, including the financing of
electric, gas, water and sewer systems and other public utilities; industrial
development and pollution control facilities; single and multi-family housing
units; public buildings and facilities; air and marine ports; transportation
facilities such as toll roads, bridges and tunnels; and health and
educational facilities such as hospitals and dormitories. They rely primarily
on user fees to pay debt service, although the principal revenue source is
often supplemented by additional security features which are intended to
enhance the creditworthiness of the issuer's obligations. In some cases,
particularly revenue bonds issued to finance housing and public buildings, a
direct or implied "moral obligation" of a governmental unit may be pledged to
the payment of debt service. In other cases, a special tax or other charge
may augment user fees.

   Included within the revenue category are participations in lease
obligations or installment purchase contracts (hereinafter collectively
called "lease obligations") of municipalities. State and local governments
issue lease obligations to acquire equipment and facilities.

                                6



     
<PAGE>

   Lease obligations may have risks not normally associated with general
obligation or other revenue bonds. Leases and installment purchase or
conditional sale contracts (which may provide for title to the leased asset
to pass eventually to the issuer) have developed as a means for governmental
issuers to acquire property and equipment without the necessity of complying
with the constitutional and statutory requirements generally applicable for
the issuance of debt. Certain lease obligations contain "non-appropriation"
clauses that provide that the governmental issuer has no obligation to make
future payments under the lease or contract unless money is appropriated for
such purpose by the appropriate legislative body on an annual or other
periodic basis. Consequently, continued lease payments on those lease
obligations containing "non-appropriation" clauses are dependent on future
legislative actions. If such legislative actions do not occur, the holders of
the lease obligation may experience difficulty in exercising their rights,
including disposition of the property.

   Lease obligations represent a relatively new type of financing that has
not yet developed the depth of marketability associated with more
conventional municipal obligations, and, as a result, certain of such lease
obligations, may be considered illiquid securities. To determine whether or
not the Fund will consider such securities to be illiquid (the Fund may not
invest more than ten percent of its net assets in illiquid securities), the
Trustees of the Fund have established guidelines to be utilized by the Fund
in determining the liquidity of a lease obligation. The factors to be
considered in making the determination include: (1) the frequency of trades
and quoted prices for the obligation; (2) the number of dealers willing to
purchase or sell the security and the number of other potential purchasers;
(3) the willingness of dealers to undertake to make a market in the security;
and (4) the nature of the marketplace trades, including the time needed to
dispose of the security, the method of soliciting offers, and the mechanics
of the transfer.

VARIABLE RATE OBLIGATIONS. The interest rates payable on certain Municipal
Bonds and Municipal Notes are not fixed and may fluctuate based upon changes
in market rates. Municipal obligations of this type are called "variable
rate" obligations. The interest rate payable on a variable rate obligation is
adjusted either at predesignated periodic intervals or whenever there is a
change in the market rate of interest on which the interest rate payable is
based.

   The foregoing percentage and rating policies apply at the time of
acquisition of a security based on the last previous determination of the
Fund's net asset value. Any subsequent change in any rating by a rating
service or change in percentages resulting from market fluctuations or other
changes in the Fund's total assets will not require elimination of any
security from the Fund's portfolio until such time as the Investment Manager
determines that it is practicable to sell the security without undue market
or tax consequences to the Fund.

   The ratings assigned by Moody's and S&P represent their opinions as to the
quality of the securities which they undertake to rate (see the Appendix to
the Statement of Additional Information). It should be emphasized, however,
that the ratings are general and not absolute standards of quality.



     
RISK CONSIDERATIONS AND
INVESTMENT PRACTICES

The value of the Fund's portfolio securities and, therefore, the Fund's net
asset value per share may increase or decrease due to various factors,
principally changes in prevailing interest rates and the ability of the
issuers of the Fund's portfolio securities to pay interest and principal on
such obligations on a timely basis. Generally, a rise in interest rates will
result in a decrease in the Fund's net asset value per share, while a drop in
interest rates will result in an increase in the Fund's net asset value per
share.

WHEN-ISSUED AND DELAYED DELIVERY SECURITIES. The Fund may purchase tax-exempt
securities on a when-issued or delayed delivery basis; i.e., delivery and
payment can take place a month or more after the date of the transaction.
These securities are subject to market fluctuation and no interest accrues to
the purchaser prior to settlement. At the time the Fund makes the commitment
to purchase such securities, it will record the transaction and thereafter
reflect the value, each day, of such securities in determining its net asset
value. An increase in the percentage of the Fund's assets committed to the
purchase of securities on a when-issued or delayed delivery basis may
increase the volatility of the Fund's net asset value.

FUTURES CONTRACTS AND OPTIONS ON FUTURES. The Fund may enter into financial
futures contracts ("futures contracts"), options on such futures and
municipal bond index futures contracts for hedging purposes. The Fund may
sell a futures contract or a call option thereon or purchase a put option on
such futures contract, if the Investment Manager anticipates interest rates
to rise, as a hedge against a decrease in the value of the Fund's portfolio
securities. If the Investment Manager anticipates that interest rates

                                7



     
<PAGE>

will decline, the Fund may purchase a futures contract or a call option
thereon or sell a put option on such futures contract, to protect against an
increase in the price of the securities the Fund intends to purchase. These
futures contracts and related options thereon will be used only as a hedge
against anticipated interest rate changes. A futures contract sale creates an
obligation by the Fund, as seller, to deliver the specific type of instrument
called for in the contract at a specified future time for a specified price.
A futures contract purchase creates an obligation by the Fund, as purchaser,
to take delivery of the specific type of financial instrument at a specified
future time at a specified price. The specific securities delivered or taken,
respectively, at settlement date, would not be determined until or near that
date. The determination would be in accordance with the rules of the exchange
on which the futures contract sale or purchase was effected.

   Although the terms of futures contracts specify actual delivery or receipt
of securities, in most instances the contracts are closed out before the
settlement date without the making or taking of delivery of the securities.
Closing out of a futures contract is effected by entering into an offsetting
purchase or sale transaction.

   Unlike a futures contract, which requires the parties to buy and sell a
security on a set date, an option on a futures contract entitles its holder
to decide on or before a future date whether to enter into such a contract (a
long position in the case of a call option and a short position in the case
of a put option). If the holder decides not to enter into the contract, the
premium paid for the option on the contract is lost. Since the value of the
option is fixed at the point of sale, there are not daily payments of cash to
reflect the change in the value of the underlying contract as there are by a
purchaser or seller of a futures contract. The value of the option does
change and is reflected in the net asset value of the Fund.

   A risk in employing futures contracts to protect against the price
volatility of portfolio securities is that the prices of securities subject
to futures contracts may correlate imperfectly with the behavior of the cash
prices of the Fund's portfolio securities. The risk of imperfect correlation
may be increased by the fact that the Fund will invest in futures contracts
on taxable securities and there is no guarantee that the prices of taxable
securities will move in a similar manner to the prices of tax-exempt
securities. The correlation may be distorted by the fact that the futures
market is dominated by short-term traders seeking to profit from the
difference between a contract or security price objective and their cost of
borrowed funds. Such distortions are generally minor and would diminish as
the contract approached maturity.

   Another risk is that the Investment Manager could be incorrect in its
expectations as to the direction or extent of various interest rate movements
or the time span within which the movements take place. For example, if the
Fund sold futures contracts for the sale of securities in anticipation of an
increase in interest rates, and then interest rates went down instead,
causing bond prices to rise, the Fund would lose money on the sale.

   In addition to the risks that apply to all options transactions (see the
Statement of Additional Information for a description of the characteristics
of, and the risks of investing in, options on debt securities), there are
several special risks relating to options on futures; in particular, the
ability to establish and close out positions on options on futures will be
subject to the development and maintenance of a liquid secondary market. It
is not certain that this market will develop or be maintained.



     

MUNICIPAL BOND INDEX FUTURES. The Fund may utilize municipal bond index
futures contracts and options thereon for hedging purposes. The Fund's
strategies in employing such contracts will be similar to that discussed
above with respect to financial futures and options thereon. A municipal bond
index is a method of reflecting in a single number the market value of many
different municipal bonds and is designed to be representative of the
municipal bond market generally. The index fluctuates in response to changes
in the market values of the bonds included within the index. Unlike futures
contracts on particular financial instruments, transactions in futures on a
municipal bond index will be settled in cash, if held until the close of
trading in the contract. However, like any other futures contract, a position
in the contract may be closed out by purchase or sale of an offsetting
contract for the same delivery month prior to expiration of the contract.

   The Fund may not enter into futures contracts or purchase related options
thereon if immediately thereafter the amount committed to margin plus the
amount paid for premiums for unexpired options on futures contracts exceeds
5% of the value of the Fund's total assets. The Fund may not purchase or sell
futures contracts or related options thereon if, immediately thereafter, more
than one-third of its net assets would be hedged.

   For a discussion of the risks of certain types of Municipal Obligations,
such as lease obligations and residual interest bonds, see above in
"Investment Objectives and Policies."

                                8



     
<PAGE>

PORTFOLIO MANAGEMENT

The Fund is actively managed by the Investment Manager with a view to
achieving the Fund's investment objective. In determining which securities to
purchase for the Fund or hold in the Fund's portfolio, the Investment Manager
will rely on information from various sources, including research, analysis
and appraisals of brokers and dealers, including Dean Witter Reynolds Inc.
("DWR"), a broker-dealer affiliate of InterCapital, the views of Trustees of
the Fund and others regarding economic developments and interest rate trends,
and the Investment Manager's own analysis of factors it deems relevant. The
Fund is managed within InterCapital's Tax-Exempt Income Group, which manages
40 tax-exempt municipal funds and fund portfolios, with approximately $10.6
billion in assets as of October 31, 1995. James F. Willison, Senior Vice
President of InterCapital and Manager of InterCapital's Tax-Exempt Income
Group, is the primary portfolio manager of the Fund and has been managing
portfolios of municipal securities at InterCapital for over five years.

   Securities are purchased and sold principally in response to the
Investment Manager's current evaluation of an issuer's ability to meet its
debt obligations in the future, and the Investment Manager's current
assessment of future changes in the levels of interest rates on tax-exempt
securities of varying maturities. Securities purchased by the Fund are,
generally, sold by dealers acting as principal for their own accounts.
Pursuant to an order of the Securities and Exchange Commission, the Fund may
effect principal transactions in certain money market instruments with DWR.
In addition, the Fund may incur brokerage commissions on transactions
conducted through DWR.

   The portfolio trading engaged in by the Fund may result in its portfolio
turnover rate exceeding 100%. The Fund will incur underwriting discount costs
(on underwritten securities) commensurate with its portfolio turnover rate.
Additionally, see "Dividends, Distributions and Taxes" for a discussion of
the tax policy of the Fund. A more extensive discussion of the Fund's
portfolio brokerage policies is set forth in the Statement of Additional
Information.

   Except as specifically noted, all investment objectives, policies and
practices discussed above are not fundamental policies of the Fund and, as
such, may be changed without shareholder approval.



     

INVESTMENT RESTRICTIONS
- -----------------------------------------------------------------------------

   The investment restrictions listed below are among the restrictions which
have been adopted by the Fund as fundamental policies. Under the Investment
Company Act of 1940, as amended (the "Act"), a fundamental policy may not be
changed without the vote of a majority of the outstanding voting securities
of the Fund, as defined in the Act.

   For purposes of the following restrictions: (a) an "issuer" of a security
is the entity whose assets and revenues are committed to the payment of
interest and principal on that particular security; (b) a "taxable security"
is any security the interest on which is subject to federal income tax; and
(c) all percentage limitations apply immediately after a purchase or initial
investment, and any subsequent change in any applicable percentage resulting
from market fluctuations or other changes in the Fund's total assets does not
require elimination of any security from the portfolio.

   The Fund may not:

   1. As to 75% of its total assets, invest more than 5% of the value of its
total assets in the securities of any one issuer (other than obligations
issued or guaranteed by the United States Government, its agencies or
instrumentalities).

   2. As to 75% of its total assets, purchase more than 10% of all
outstanding voting securities of any one issuer (other than obligations
issued, or guaranteed as to principal and interest, by the United States
Government, its agencies or instrumentalities).

   3. Invest 25% or more of the value of its total assets in securities of
issuers in any one industry. This restriction does not apply to obligations
issued or guaranteed by the United States Government, its agencies or
instrumentalities (industrial development and pollution control bonds are
grouped into industries based upon the business in which the issuers of such
obligations are engaged).

   4. Invest more than 5% of the value of its total assets in taxable
securities of issuers having a record, together with predecessors, of less
than three years of continuous operation. This restriction shall not apply to
any obligation of the United States Government, its agencies or
instrumentalities.

                                9



     
<PAGE>

PURCHASE OF FUND SHARES
- -----------------------------------------------------------------------------

   The Fund offers its shares for sale to the public on a continuous basis.
Pursuant to a Distribution Agreement between the Fund and Dean Witter
Distributors Inc. (the "Distributor"), an affiliate of the Investment
Manager, shares of the Fund are distributed by the Distributor and offered by
DWR and other dealers who have entered into agreements with the Distributor
("Selected Broker-Dealers"). The principal executive office of the
Distributor is located at Two World Trade Center, New York, New York 10048.

   The minimum initial purchase is $1,000. Subsequent purchases of $100 or
more may be made by sending a check, payable to Dean Witter National
Municipal Trust, directly to Dean Witter Trust Company (the "Transfer Agent")
at P.O. Box 1040, Jersey City, N.J. 07303 or by contacting an account
executive of DWR or other Selected Broker-Dealer. In the case of purchases
made pursuant to systematic payroll deduction plans, the Fund, in its
discretion, may accept such purchases without regard to any minimum amounts
which would otherwise be required if the Fund has reason to believe that
additional purchases will increase the amount of the purchase of shares in
all accounts under such plans to at least $1,000. Certificates for shares
purchased will not be issued unless a request is made by the shareholder in
writing to the Transfer Agent.
   
   Shares of the Fund are sold through the Distributor on a normal three
business day settlement basis; that is payment generally is due on or before
the third business day (settlement date) after the order is placed with the
Distributor. Shares purchased through the Distributor are entitled to
dividends beginning on the next business day following settlement date. Since
the Distributor forwards investors' funds on settlement date, it will benefit
from the temporary use of the funds if payment is made prior thereto. Shares
purchased through the Transfer Agent are entitled to dividends beginning on
the next business day following receipt of an order. As noted above, orders
placed directly with the Transfer Agent must be accompanied by payment.
Investors will be entitled to receive capital gains distributions if their
order is received by the close of business on the day prior to the record
date for such distributions. The offering price will be the net asset value
per share next determined following receipt of an order (see "Determination
of Net Asset Value" below). While no sales charge is imposed at the time
shares are purchased, a contingent deferred sales charge may be imposed at
the time of redemption (see "Redemptions and Repurchases"). Sales personnel
are compensated for selling shares of the Fund at the time of their sale by
the Distributor or any of its affiliates and/or the Selected Broker-Dealer.
In addition, some sales personnel of the Selected Broker-Dealer will receive
various types of non-cash compensation as special sales incentives, including
trips, educational and/or business seminars and merchandise. The Fund and the
Distributor reserve the right to reject any purchase orders.
    
ANALOGOUS DEAN WITTER FUNDS. The Distributor and the Investment Manager serve
in the same capacities for Dean Witter Tax-Exempt Securities Trust, an
open-end investment company with investment objectives and policies similar
to those of the Fund. Unlike the Fund, however, shares of Dean Witter
Tax-Exempt Securities Trust are offered to the public with a sales charge
imposed at the time of purchase, rather than a contingent deferred sales
charge assessed upon redemptions within three years of purchase. These two
Dean Witter Funds have differing fees and expenses, which will affect
performance. Investors who would like to receive a prospectus for Dean Witter
Tax-Exempt Securities Trust should call the telephone numbers listed on the
front cover of this Prospectus, or may call their account executive for
additional information.




     

PLAN OF DISTRIBUTION

The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the
Act (the "Plan"), under which the Fund pays the Distributor a fee, which is
accrued daily and payable monthly, at an annual rate of 0.60% of the lesser
of: (a) the average daily aggregate gross sales of the Fund's shares since
the inception of the Fund (not including reinvestments of dividends or
capital gains distributions), less the average daily aggregate net asset
value of the Fund's shares redeemed since the Fund's inception upon which a
contingent deferred sales charge has been imposed or waived; or (b) the
Fund's average daily net assets. This fee is treated by the Fund as an
expense in the year it is accrued. A portion of the fee payable pursuant to
the Plan, equal to 0.15% of the Fund's average daily net assets, is
characterized as a service fee within the meaning of NASD guidelines.

   Amounts paid under the Plan are paid to the Distributor to compensate it
for the services provided and the expenses borne by the Distributor and
others in the distribution of the Fund's shares, including the payment of
commissions for sales of the Fund's shares and incentive compensation to and
expenses of DWR

                               10



     
<PAGE>

account executives and others who engage in or support distribution of
shares, including overhead and telephone expenses; printing and distribution
of prospectuses and reports used in connection with the offering of the
Fund's shares to other than current shareholders; and preparation, printing
and distribution of sales literature and advertising materials. In addition,
the Distributor may utilize fees paid pursuant to the Plan to compensate DWR
and other Selected Broker-Dealers for their opportunity costs in advancing
such amounts, which compensation would be in the form of a carrying charge on
any unreimbursed distribution expenses.

   For the fiscal year ended September 30, 1995, the Fund accrued payments
under the Plan amounting to $271,201 which amount is equal to 0.60% of the
Fund's average daily net assets for the fiscal year. The payments accrued
under the Plan were calculated pursuant to clause (a) of the compensation
formula under the Plan.

   At any given time, the expenses in distributing shares of the Fund may be
in excess of the total of (i) the payments made by the Fund pursuant to the
Plan, and (ii) the proceeds of contingent deferred sales charges paid by
investors upon the redemption of shares (see "Redemptions and
Repurchases--Contingent Deferred Sales Charge"). For example, if $1 million
in expenses in distributing shares of the Fund had been incurred and $750,000
had been received as described in (i) and (ii) above, the excess expense
would amount to $250,000. The Distributor has advised the Fund that such
excess amounts, including the carrying charge described above, totalled
$1,667,655 at September 30, 1995 which was equal to 2.59% of the Fund's net
assets on such date. Because there is no requirement under the Plan that the
Distributor be reimbursed for all expenses or any requirement that the Plan
be continued from year to year, this excess amount does not constitute a
liability of the Fund. Although there is no legal obligation for the Fund to
pay expenses incurred in excess of payments made to the Distributor under the
Plan, and the proceeds of contingent deferred sales charges paid by investors
upon redemption of shares, if for any reason the Plan is terminated, the
Trustees will consider at that time the manner in which to treat such
expenses. Any cumulative expenses incurred, but not yet recovered through
distribution fees or contingent deferred sales charges, may or may not be
recovered through future distribution fees or contingent deferred sales
charges.

DETERMINATION OF NET ASSET VALUE

The net asset value per share of the Fund is determined once daily at 4:00
p.m., New York time (or, on days when the New York Stock Exchange closes
prior to 4:00 p.m., at such earlier time), on each day that the New York
Stock Exchange is open by taking the value of all assets of the Fund,
subtracting its liabilities, dividing by the number of shares outstanding and
adjusting to the nearest cent. The net asset value per share will not be
determined on Good Friday and on such other federal and non-federal holidays
as are observed by the New York Stock Exchange.

   Portfolio securities (other than short-term taxable debt securities,
futures and options) are valued for the Fund by an outside independent
pricing service approved by the Fund's Trustees. The service utilizes a
computerized grid matrix of tax-exempt securities and evaluations by its
staff in determining what it believes is the fair value of the Fund's
portfolio securities. The Board believes that timely and reliable market
quotations are generally not readily available to the Fund for purposes of
valuing tax-exempt securities and that the valuations supplied by the pricing
services are more likely to approximate the fair value of such securities.




     

   Short-term taxable debt securities with remaining maturities of sixty days
or less at time of purchase are valued at amortized cost, unless the Board
determines such does not reflect the securities' fair value, in which case
these securities will be valued at their market value as determined by the
Board of Trustees. Other taxable short-term debt securities with maturities
of more than sixty days will be valued on a mark to market basis until such
time as they reach a maturity of sixty days, whereupon they will be valued at
amortized cost using their value on the 61st day unless the Trustees
determine such does not reflect the securities' fair value, in which case
these securities will be valued at their fair market value as determined by
the Board of Trustees. Listed options on debt securities are valued at the
latest sale price on the exchange on which they are listed unless no sales of
such options have taken place that day, in which case, they will be valued at
the mean between their closing bid and asked prices. Unlisted options on debt
securities are valued at the mean between their latest bid and asked price.
Futures are valued at the latest sale price on the commodities exchange on
which they trade unless the Board of Trustees determines that such price does
not reflect their market value, in which case they will be valued at their
fair value as determined by the Board of Trustees. All other securities and
other assets are valued at their fair value as determined in good faith under
procedures established by and under the supervision of the Board of Trustees.

                               11



     
<PAGE>

SHAREHOLDER SERVICES
- -----------------------------------------------------------------------------

AUTOMATIC INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS. All income dividends and
capital gains distributions are automatically paid in full and fractional
shares of the Fund (or, if specified by the shareholder, any other open-end
investment company for which InterCapital serves as investment manager
(collectively, with the Fund, the "Dean Witter Funds")), unless the
shareholder requests that they be paid in cash. Shares so acquired are not
subject to the imposition of a contingent deferred sales charge upon their
redemption (see "Redemptions and Repurchases"). Such dividends and
distributions will be paid, at the net asset value per share, in shares of
the Fund (or in cash if the shareholder so requests) on the monthly payment
date, which generally will be no later than the last business day of the
month for which the dividend or distribution is payable. Processing of
dividend checks begins immediately following the monthly payment date.
Shareholders who have requested to receive dividends in cash will normally
receive their monthly dividend check during the first ten days of the
following month.

EASYINVESTSM. Shareholders may subscribe to EasyInvest, an automatic purchase
plan which provides for any amount from $100 to $5,000 to be transferred
automatically from a checking or savings account, on a semi-monthly, monthly
or quarterly basis, to the Transfer Agent for investment in shares of the
Fund.

SYSTEMATIC WITHDRAWAL PLAN. A systematic withdrawal plan (the "Withdrawal
Plan") is available for shareholders who own or purchase shares of the Fund
having a minimum value of $10,000 based upon the then current net asset
value. The Withdrawal Plan provides for monthly or quarterly (March, June,
September, December) checks in any dollar amount, not less than $25, or in
any whole percentage of the account balance, on an annualized basis. Any
applicable contingent deferred sales charge will be imposed on shares
redeemed under the Withdrawal Plan (See "Redemptions and Repurchases--
Contingent Deferred Sales Charge"). Therefore, any shareholder participating
in the Withdrawal Plan will have sufficient shares redeemed from his or her
account so that the proceeds (net of any applicable contingent deferred sales
charge) to the shareholder will be the designated monthly or quarterly
amount.

   Shareholders should contact their DWR or other Selected Broker-Dealer
account executive or the Transfer Agent for further information about any of
the above services.

TAX-SHELTERED RETIREMENT PLANS. Retirement plans are available for use by
corporations, the self-employed, Individual Retirement Accounts and Custodial
Accounts under Section 403(b)(7) of the Internal Revenue Code. Adoption of
such plans should be on advice of legal counsel or tax adviser.

   For further information regarding plan administration, custodial fees and
other details, investors should contact their account executive or the
Transfer Agent.




     

EXCHANGE PRIVILEGE

The Fund makes available to its shareholders an "Exchange Privilege" allowing
the exchange of shares of the Fund for shares of other Dean Witter Funds sold
with a contingent deferred sales charge ("CDSC funds"), and for shares of
Dean Witter Short-Term U.S. Treasury Trust, Dean Witter Limited Term
Municipal Trust, Dean Witter Short-Term Bond Fund, Dean Witter Balanced
Income Fund, Dean Witter Balanced Growth Fund, Dean Witter Intermediate Term
U.S. Treasury Trust and five Dean Witter Funds which are money market funds
(the foregoing eleven non-CDSC funds are hereinafter referred to as the
"Exchange Funds"). Exchanges may be made after the shares of the Fund
acquired by purchase (not by exchange or dividend reinvestment) have been
held for thirty days. There is no waiting period for exchanges of shares
acquired by exchange or dividend reinvestment.

   An exchange to another CDSC fund or any Exchange Fund that is not a money
market fund is on the basis of the next calculated net asset value per share
of each fund after the exchange order is received. When exchanging into a
money market fund from the Fund, shares of the Fund are redeemed out of the
Fund at their next calculated net asset value and the proceeds of the
redemption are used to purchase shares of the money market fund at their net
asset value determined the following day. Subsequent exchanges between any of
the money market funds and any of the CDSC funds can be effected on the same
basis. No contingent deferred sales charge ("CDSC") is imposed at the time of
any exchange, although any applicable CDSC will be imposed upon ultimate
redemption. Shares of the Fund which are exchanged for shares of another CDSC
fund having a higher CDSC schedule than the Fund will be subject to the CDSC
schedule of the other CDSC fund, even if shares are subsequently reexchanged
for shares of the Fund prior to redemption. During the period of time the
shareholder remains invested in the Exchange Fund

                               12



     
<PAGE>

(calculated from the last day of the month in which the Exchange Fund shares
were acquired), the holding period (for the purpose of determining the rate
of the CDSC) is frozen. If those shares are subsequently reexchanged for
shares of a CDSC fund, the holding period previously frozen when the first
exchange was made resumes on the last day of the month in which shares of a
CDSC fund are reacquired. Thus, the CDSC is based upon the time (calculated
as described above) the shareholder was invested in shares of a CDSC fund
(see "Redemptions and Repurchases--Contingent Deferred Sales Charge").
However, in the case of shares of the Fund exchanged into an Exchange Fund
upon a redemption of shares which results in a CDSC being imposed, a credit
(not to exceed the amount of the CDSC) will be given in an amount equal to
the Exchange Fund 12b-1 distribution fees incurred on or after that date
which are attributable to those shares. (Exchange Fund 12b-1 distribution
fees, if any, are described in the prospectuses for those funds.)

   In addition, shares of the Fund may be acquired in exchange for shares of
certain Dean Witter Funds sold with a front-end sales charge ("front-end
sales charge funds"), but shares of the Fund, however acquired, may not be
exchanged for shares of front-end sales charge funds. Shares of a CDSC fund
acquired in exchange for shares of a front-end sales charge fund (or in
exchange for shares of other Dean Witter Funds for which shares of a
front-end sales charge fund have been exchanged) are not subject to any CDSC
upon their redemption.

   Purchases and exchanges should be made for investment purposes only. A
pattern of frequent exchanges may be deemed by the Investment Manager to be
abusive and contrary to the best interests of the Fund's other shareholders
and, at the Investment Manager's discretion, may be limited by the Fund's
refusal to accept additional purchases and/or exchanges from the investor.
Although the Fund does not have any specific definition of what constitutes a
pattern of frequent exchanges, and will consider all relevant factors in
determining whether a particular situation is abusive and contrary to the
best interests of the Fund and its other shareholders, investors should be
aware that the Fund and each of the other Dean Witter Funds may in their
discretion limit or otherwise restrict the number of times this Exchange
Privilege may be exercised by any investor. Any such restriction will be made
by the Fund on a prospective basis only, upon notice to the shareholder not
later than ten days following such shareholder's most recent exchange.

   The Exchange Privilege may be terminated or revised at any time by the
Fund and/or any of such Dean Witter Funds for which shares of the Fund may be
exchanged, upon such notice as may be required by applicable regulatory
agencies. Shareholders maintaining margin accounts with DWR or another
Selected Broker-Dealer are referred to their account executive regarding
restrictions on exchange of shares of the Fund pledged in their margin
account.




     

   The current prospectus for each fund describes its investment objectives
and policies, and shareholders should obtain one and read it carefully before
investing. Exchanges are subject to the minimum investment requirement and
other conditions imposed by each fund. In the case of any shareholder holding
a share certificate or certificates, no exchanges may be made until the share
certificate(s) have been received by the Transfer Agent and deposited in the
shareholder's account. An exchange will be treated for federal income tax
purposes as a redemption or repurchase of shares, on which the shareholder
may realize a capital gain or loss. However, the ability to deduct capital
losses on an exchange is limited in situations where there is an exchange of
shares within ninety days after the shares are purchased. There are also
limits on the deduction of losses after the payment of exempt-interest
dividends for shares held for less than six months (see "Dividends,
Distributions and Taxes"). The Exchange Privilege is only available in states
where an exchange may legally be made.

   If DWR or another Selected Broker-Dealer is the current dealer of record
and its account numbers are part of the account information, shareholders may
initiate an exchange of shares of the Fund for shares of any of the Dean
Witter Funds (for which the Exchange Privilege is available) pursuant to this
Exchange Privilege by contacting their DWR or other Selected Broker-Dealer
account executive (no Exchange Privilege Authorization Form is required).
Other shareholders (and those shareholders who are clients of DWR or another
Selected Broker-Dealer but who wish to make exchanges directly by writing or
telephoning the Transfer Agent) must complete and forward to the Transfer
Agent an Exchange Privilege Authorization Form, copies of which may be
obtained from the Transfer Agent, to initiate an exchange. If the
Authorization Form is used, exchanges may be made by contacting the Transfer
Agent at (800) 869-NEWS (toll free). The Fund will employ reasonable
procedures to confirm that exchange instructions communicated over the
telephone are genuine. Such procedures may include requiring various forms of
personal identification such as name, mailing address,

                               13



     
<PAGE>

social security or other tax identification number and DWR or other Selected
Broker-Dealer account number (if any). Telephone instructions may also be
recorded. If such procedures are not employed, the Fund may be liable for any
losses due to unauthorized or fraudulent instructions.

   Telephone exchange instructions will be accepted if received by the
Transfer Agent between 9:00 a.m. and 4:00 p.m. New York time, on any day the
New York Stock Exchange is open. Any shareholder wishing to make an exchange
who has previously filed an Exchange Privilege Authorization Form and who is
unable to reach the Fund by telephone should contact his or her DWR or other
Selected Broker-Dealer account executive, if appropriate, or make a written
exchange request (see "Redemptions and Repurchases"). Shareholders are
advised that during periods of drastic economic or market changes, it is
possible that the telephone exchange procedures may be difficult to
implement, although this has not been the case with the Dean Witter Funds in
the past.

   For further information regarding the Exchange Privilege, shareholders
should contact their account executive or the Transfer Agent.

REDEMPTIONS AND REPURCHASES
- -----------------------------------------------------------------------------

   REDEMPTION. Shares of the Fund can be redeemed for cash at any time at the
net asset value per share next determined; however, such redemption proceeds
will be reduced by the amount of any applicable contingent deferred sales
charges (see below). If shares are held in a shareholder's account without a
share certificate, a written request for redemption to the Fund's Transfer
Agent at P.O. Box 983, Jersey City, NJ 07303 is required. If certificates are
held by the shareholder, the shares may be redeemed by surrendering the
certificates with a written request for redemption, along with any additional
information required by the Transfer Agent.

CONTINGENT DEFERRED SALES CHARGE. Shares of the Fund which are held three
years or more after purchase (calculated from the last day of the month in
which the shares were purchased) will not be subject to any charge upon
redemption. Shares redeemed sooner than three years after purchase may,
however, be subject to a charge upon redemption. This charge is called a
"contingent deferred sales charge" ("CDSC"), which will be a percentage of
the dollar amount of shares redeemed and will be assessed on an amount equal
to the lesser of the current market value or the cost of the shares being
redeemed. The size of this percentage will depend upon how long the shares
have been held, as set forth in the table below:

<TABLE>
<CAPTION>
                              CONTINGENT DEFERRED
        YEAR SINCE             SALES CHARGE AS A
         PURCHASE            PERCENTAGE OF AMOUNT
       PAYMENT MADE                REDEEMED
- -------------------------  -----------------------
<S>                        <C>
First .................... 3.0%
Second ................... 2.0%
Third .................... 1.0%
Fourth and thereafter  ... None

</TABLE>

   A CDSC will not be imposed on: (i) any amount which represents an increase
in value of shares purchased within the three years preceding the redemption;
(ii) the current net asset value of shares purchased more than three years
prior to the redemption; and (iii) the current net asset value of shares
purchased through reinvestment of dividends or distributions and/or shares
acquired in exchange for shares of Dean Witter Funds sold with a front-end
sales charge or of other Dean Witter Funds acquired in exchange for such
shares. Moreover, in determining whether a CDSC is applicable it will be
assumed that amounts described in (i), (ii) and (iii) above (in that order)
are redeemed first.




     

   In addition, the CDSC, if otherwise applicable, will be waived in the case
of: (i) redemptions of shares held at the time a shareholder dies or becomes
disabled, only if the shares are (a) registered either in the name of an
individual shareholder (not a trust), or in the names of such shareholder and
his or her spouse as joint tenants with right of survivorship, or (b) held in
a qualified corporate or self-employed retirement plan, Individual Retirement
Account or Custodial Account under Section 403(b)(7) of the Internal Revenue
Code, provided in either case that the redemption is requested within one
year of the death or initial determination of disability, and (ii)
redemptions in connection with the following retirement plan distributions:
(a) lump-sum or other distributions from a qualified corporate or
self-employed retirement plan following retirement (or in the case of a
"key-employee" of a "top heavy" plan, following attainment of age 59 1/2 );
(b) distributions from an Individual Retirement Account or Custodial Account
under Section 403(b)(7) of the Internal Revenue Code following attainment of
age 59 1/2 ; and (c) a tax-free return of an excess contribution to an IRA.
For the purpose of determining disability, the Distributor utilizes the
definition of disability contained in Section 72(m)(7) of

                               14



     
<PAGE>

the Internal Revenue Code, which relates to the inability to engage in
gainful employment. All waivers will be granted only following receipt by the
Distributor of confirmation of the investor's entitlement.

REPURCHASE. DWR and other Selected Broker-Dealers are authorized to
repurchase shares represented by a share certificate which is delivered to
any of their offices. Shares held in a shareholder's account without a share
certificate may also be repurchased by DWR and other Selected Broker-Dealers
upon the telephonic request of the shareholder. The repurchase price is the
net asset value per share next determined (see "Purchase of Fund Shares")
after such repurchase order is received by DWR or other Selected
Broker-Dealer, reduced by the applicable CDSC.

   The CDSC, if any, will be the only fee imposed by the Fund, the
Distributor, DWR or other Selected Broker-Dealers. The offers by DWR and
other Selected Broker-Dealers to repurchase shares may be suspended without
notice by them at any time. In that event, shareholders may redeem their
shares through the Fund's Transfer Agent as set forth above under
"Redemption."

PAYMENT FOR SHARES REDEEMED OR REPURCHASED. Payment for shares presented for
repurchase or redemption will be made by check within seven days after
receipt by the Transfer Agent of the certificate and/or written request in
good order. Such payment may be postponed or the right of redemption
suspended under unusual circumstances. If the shares to be redeemed have
recently been purchased by check, payment of the redemption proceeds may be
delayed for the minimum time needed to verify that the check used for
investment has been honored (not more than fifteen days from the time of
investment of the check by the Transfer Agent). Shareholders maintaining
margin accounts with DWR or another Selected Broker-Dealer are referred to
their account executive regarding restrictions on redemption of shares of the
Fund pledged in the margin account.

REINSTATEMENT PRIVILEGE. A shareholder who has had his or her shares redeemed
or repurchased and has not previously exercised this reinstatement privilege
may, within thirty days after the date of the redemption or repurchase,
reinstate any portion or all of the proceeds of such redemption or repurchase
in shares of the Fund at their net asset value next determined after a
reinstatement request, together with the proceeds, is received by the
Transfer Agent and receive a pro-rata credit for any CDSC paid in connection
with such redemption or repurchase.

INVOLUNTARY REDEMPTION. The Fund reserves the right to redeem, on sixty days'
notice, and at net asset value, the shares of any shareholder (other than
shares held in an Individual Retirement Account or Custodial Account under
Section 403(b)(7) of the Code) whose shares have a value of less than $100 as
a result of redemptions or repurchases, or such lesser amount as may be fixed
by the Board of Trustees. However, before the Fund redeems such shares and
sends the proceeds to the shareholder, it will notify the shareholder that
the value of the shares is less than $100 and allow the shareholder to make
an additional investment in an amount which will increase the value of the
account to $100 or more before the redemption is processed. No CDSC will be
imposed on any involuntary redemption.




     

DIVIDENDS, DISTRIBUTIONS AND TAXES
- -----------------------------------------------------------------------------

DIVIDENDS AND DISTRIBUTIONS. The Fund declares divi- dends from net
investment income on each day the New York Stock Exchange is open for
business (see "Purchase of Fund Shares"). Such dividends are paid monthly.
The Fund intends to distribute all of the Fund's net investment income on an
annual basis.

   The Fund will distribute at least once each year all net realized
short-term capital gains in excess of any realized net long-term capital
losses, if any. The Fund intends to distribute all of its realized net
long-term capital gains, if any, in excess of any realized net short-term
capital losses and any available net capital loss carryovers, at least once
per fiscal year, although it may elect to retain all or part of such gains
for reinvestment. Taxable capital gains may be generated by the sale of
portfolio securities and by transactions in options and futures contracts
engaged in by the Fund. All dividends and capital gains distributions will be
paid in additional Fund shares (without sales charge) and automatically
credited to the shareholder's account without issuance of a share certificate
unless the shareholder requests in writing that all dividends be paid in cash
and such request is received by the close of business on the day prior to the
record date for such distributions (see "Shareholder Services--Automatic
Investment of Dividends and Distributions"). Any dividends declared in the
last quarter of any year which are paid in the

                               15



     
<PAGE>

following year prior to February 1 will be deemed received by the shareholder
in the prior year.

TAXES. Because the Fund intends to distribute all of its net investment
income and capital gains to shareholders and intends to otherwise qualify as
a regulated investment company under Subchapter M of the Internal Revenue
Code, it is not expected that the Fund will be required to pay any federal
income tax.

   The Fund intends to qualify to pay "exempt-interest dividends" to its
shareholders by maintaining, as of the close of each quarter of its taxable
year, at least 50% of the value of its total assets in tax-exempt securities.
If the Fund satisfies such requirement, distributions from net investment
income to shareholders, whether taken in cash or reinvested in additional
shares, will be excludable from gross income for federal income tax purposes
to the extent net investment income is represented by interest on tax-exempt
securities. Exempt-interest dividends are included, however, in determining
what portion, if any, of a person's Social Security benefits are subject to
federal income tax. The Internal Revenue Code may subject interest received
on certain otherwise tax-exempt securities to an alternative minimum tax.
This alternative minimum tax may be incurred due to interest received on
certain "private activity bonds" (in general, bonds that benefit
non-government entities) issued after August 7, 1986 which, although
tax-exempt, are used for purposes other than those generally performed by
government units (e.g., bonds used for commercial or housing purposes).
Income received on such bonds is classified as a "tax preference item," under
the alternative minimum tax, for both individual and corporate investors. The
Fund anticipates that a portion of its investments will be made in such
"private activity bonds," with the result that a portion of the
exempt-interest dividends paid by the Fund will be an item of tax preference
to shareholders subject to the alternative minimum tax. In addition, certain
corporations which are subject to the alternative minimum tax may also have
to include exempt-interest dividends in calculating their alternative minimum
taxable income in situations where the "adjusted current earnings" of the
corporation exceeds its alternative minimum taxable income.

   Under the Revenue Reconciliation Act of 1993, all or a portion of the
Fund's gain from the sale or redemption of tax-exempt obligations purchased
at a market discount after April 30, 1993 will be treated as ordinary income
rather than capital gain. This rule may increase the amount of ordinary
income dividends received by shareholders.

   Within sixty days after the end of its fiscal year, the Fund will mail to
its shareholders a statement indicating the percentage of the dividend
distributions for such fiscal year which constitutes exempt-interest
dividends and the percentage, if any, that is taxable, and the percentage, if
any, of the exempt-interest dividends which constitutes an item of tax
preference.

   Shareholders will normally be subject to federal income tax on dividends
paid from interest income derived from taxable securities and on
distributions of net short-term capital gains, if any. Distributions of
long-term capital gains, if any, are taxable as long-term capital gains,
regardless of how long the shareholder has held the Fund shares and
regardless of whether the distribution is received in additional shares or in
cash. To avoid being subject to a 31% federal backup withholding tax on
taxable dividends, capital gains distributions and proceeds of redemptions or
repurchases, shareholders' taxpayer identification numbers must be furnished
and certified as to their accuracy.




     

   Any loss on the sale or exchange of shares of the Fund which are held for
six months or less is disallowed to the extent of the amount of any
exempt-interest dividend paid with respect to such shares. Treasury
Regulations may provide for a reduction in such required holding periods. If
a shareholder receives a distribution that is taxed as a long-term capital
gain on shares held for six months or less and sells those shares at a loss,
the loss will be treated as a long-term capital loss.

   Interest on indebtedness incurred by shareholders to purchase or carry
shares of an investment company paying exempt-interest dividends, such as the
Fund, will not be deductible by the investor for federal income tax purposes.

   The exemption of interest income for federal income tax purposes does not
necessarily result in exemption under the income or other tax laws of any
state or local taxing authority. Thus, shareholders of the Fund may be
subject to state and local taxes on exempt-interest dividends.

   Shareholders should consult their tax advisers as to the applicability of
the above to their own tax situation.

                               16



     
<PAGE>

PERFORMANCE INFORMATION
- -----------------------------------------------------------------------------

   From time to time the Fund may quote its "yield" and/or its "total return"
in advertisements and sales literature. Both the yield and the total return
of the Fund are based on historical earnings and are not intended to indicate
future performance. The yield of the Fund is computed by dividing the Fund's
net investment income over a 30-day period by an average value (using the
average number of shares entitled to receive dividends and the maximum
offering price per share at the end of the period), all in accordance with
applicable regulatory requirements. Such amount is compounded for six months
and then annualized for a twelve-month period to derive the Fund's yield. The
Fund may also quote tax-equivalent yield, which is calculated by determining
the pre-tax yield which, after being taxed at a stated rate, would be
equivalent to the yield determined as described above.

   The "average annual total return" of the Fund refers to a figure
reflecting the average annualized percentage increase (or decrease) in the
value of an initial investment in the Fund of $1,000 over periods of one,
five and ten years, or over the life of the Fund if less than any of the
foregoing. Average annual total return reflects all income earned by the
Fund, any appreciation or depreciation of the Fund's assets, all expenses
incurred by the Fund and all sales charges which would be incurred by
redeeming shareholders, for the stated periods. It also assumes reinvestment
of all dividends and distributions paid by the Fund.

   In addition to the foregoing, the Fund may advertise its total return over
different periods of time by means of aggregate, average, year-by-year or
other types of total return figures. Such calculations may or may not reflect
the deduction of the contingent deferred sales charge which, if reflected,
would reduce the performance quoted. The Fund may also advertise the growth
of hypothetical investments of $10,000, $50,000 and $100,000 in shares of the
Fund. The Fund from time to time may also advertise its performance relative
to certain performance rankings and indexes compiled by independent
organizations (such as mutual fund performance rankings of Lipper Analytical
Services, Inc.).




     

ADDITIONAL INFORMATION
- -----------------------------------------------------------------------------

   VOTING RIGHTS. All shares of beneficial interest of the Fund are of $.01
par value and are equal as to earnings, assets and voting privileges.

   The Fund is not required to hold Annual Meetings of Shareholders and in
ordinary circumstances the Fund does not intend to hold such meetings. The
Trustees may call Special Meetings of Shareholders for action by shareholder
vote as may be required by the Act or the Declaration of Trust. Under certain
circumstances the Trustees may be removed by action of the Trustees or by the
shareholders.

   Under Massachusetts law, shareholders of a business trust may, under
certain circumstances, be held personally liable as partners for the
obligations of the Fund. However, the Declaration of Trust contains an
express disclaimer of shareholder liability for acts or obligations of the
Fund, requires that Fund obligations include such disclaimer, and provides
for indemnification and reimbursement of expenses out of the Fund's property
for any shareholder held personally liable for the obligations of the Fund.
Thus, the risk of a shareholder incurring financial loss on account of
shareholder liability is limited to circumstances in which the Fund itself
would be unable to meet its obligations. Given the above limitations on
shareholder personal liability and the nature of the Fund's assets and
operations the possibility of the Fund's being unable to meet its obligations
is remote and, in the opinion of Massachusetts counsel to the Fund, the risk
to Fund shareholders of personal liability is remote.

CODE OF ETHICS.  Directors, officers and employees of InterCapital, Dean
Witter Services Company Inc. and the Distributor are subject to a strict Code
of Ethics adopted by those companies. The Code of Ethics is intended to
ensure that the interests of shareholders and other clients are placed ahead
of any personal interest, that no undue personal benefit is obtained from a
person's employment activities and that actual and potential conflicts of
interest are avoided. To achieve these goals and comply with regulatory
requirements, the Code of Ethics requires, among other things, that personal
securities transactions by employees of the companies be subject to an
advance clearance process to monitor that no Dean Witter Fund is engaged at
the same time in a purchase or sale of the same security. The Code of Ethics
bans the purchase of securities in an initial public offering, and also
prohibits engaging in futures and option transactions and profiting on
short-term trading (that is, a purchase within sixty days of a sale or a sale
within sixty

                               17



     
<PAGE>

days of a purchase) of a security. In addition, investment personnel may not
purchase or sell a security for their personal account within thirty days
before or after any transaction in any Dean Witter Fund managed by them. Any
violations of the Code of Ethics are subject to sanctions, including
reprimand, demotion or suspension or termination of employment. The Code of
Ethics comports with regulatory requirements and the recommendations in the
recent report by the Investment Company Institute Advisory Group on Personal
Investing.

SHAREHOLDER INQUIRIES. All inquiries regarding the Fund should be directed to
the Fund at the telephone numbers or address set forth on the front cover of
this Prospectus.

                               18



     
<PAGE>

DEAN WITTER
NATIONAL MUNICIPAL TRUST
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048

BOARD OF TRUSTEES

Jack F. Bennett
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Manuel H. Johnson
Paul Kolton
Michael E. Nugent
Philip J. Purcell
John L. Schroeder

OFFICERS

Charles A. Fiumefreddo
Chairman and Chief Executive Officer

Sheldon Curtis
Vice President, Secretary and
General Counsel

James W. Willison
Vice President

Thomas F. Caloia
Treasurer

CUSTODIAN

The Bank of New York
90 Washington Street
New York, New York 10286

TRANSFER AGENT AND DIVIDEND
DISBURSING AGENT

Dean Witter Trust Company
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311

INDEPENDENT ACCOUNTANTS

Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036

INVESTMENT MANAGER

Dean Witter InterCapital Inc.






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