REICH & TANG DISTRIBUTORS L.P.
600 Fifth Avenue
New York, New York 10020
(212) 830-5400
November 26, 1996
VIA EDGAR
Securities and Exchange Commission
450 Fifth Street N.W.
Washington, D.C. 20549
Re: Insured Municipal Securities Trust, Pennsylvania
Navigator Insured Series 1
File No. 33-35080
Gentlemen:
As Sponsors of the above-referenced Trust, we are writing
this letter to certify that:
(1) the form of Prospectus that would have been filed under
Rule 497(b) of the Securities Act of 1933, does not differ from that contained
in the most recent Post-Effective Amendment to the Registration Statement on
Form S-6 (the "Registration Statement"), and
(2) the text of the most recent Registration Statement was
filed electronically with the Securities and Exchange Commission on October 28,
1996 and became effective October 31, 1996 pursuant to Rule 485(b).
Insured Municipal Securities Trust,
REICH & TANG DISTRIBUTORS L.P.
GRUNTAL & CO. INCORPORATED
By: ___________________________________
Peter J. DeMarco
as agent for the Sponsors
C/M 11939.0001 430037.1
