<PAGE>
Filed Pursuant to Rule 497(e)
Registration File No.: 2-66268
<PAGE>
SUPPLEMENT TO THE PROSPECTUS OF
DEAN WITTER TAX-EXEMPT SECURITIES TRUST
DATED FEBRUARY 27, 1995
The Fund's Trustees have approved the resumption of the offering of shares
of Dean Witter Tax-Exempt Securities Trust (the "Fund") to new investors
effective June 1, 1995, as well as continuing to offer shares of the Fund to
current shareholders. Accordingly, the disclosure in the Fund's Prospectus
pertaining to the suspension of the offering of shares of the Fund to new
investors is hereby deleted.
In addition, the section of the Prospectus entitled "PURCHASE OF FUND
SHARES" is hereby amended by the addition of the following paragraph:
Analogous Dean Witter Funds. The Distributor and the Investment
Manager serve in the same capacities for Dean Witter National
Municipal 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 National Municipal Trust are offered to
the public at net asset value, with a contingent deferred sales charge
assessed upon redemptions within six years of purchase, as well as an
annual Rule 12b-1 distribution fee, rather than a sales charge imposed
at the time 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 National Municipal Trust
should call the telephone numbers listed on the front cover of this
Prospectus, or may call their account executive for additional
information.
May 26, 1995
Filed Pursuant to Rule 497(e)
Registration File No.: 33-53015
<PAGE>
SUPPLEMENT TO THE PROSPECTUS OF
DEAN WITTER NATIONAL MUNICIPAL TRUST
DATED NOVEMBER 21, 1994
Effective June 1, 1995, the section of the Prospectus entitled "PURCHASE
OF FUND SHARES" is amended by the addition of the following paragraph:
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 six 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.
May 26, 1995