INSURED MUN SEC TR 50 DIS SER NJ NAV INS SER 1 PA NA IN SE 1, 497J, 1998-11-13

INSURED MUN SEC TR 50 DIS SER NJ NAV INS SER 1 PA NA IN SE 1
497J, 1998-11-13

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REICH & TANG DISTRIBUTORS, INC.
600 Fifth Avenue
New York, New York 10020
(212) 830-5400





                                   November 13, 1998


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,
1998 and became effective October 28, 1998 pursuant to Rule 485(b).

                                   Insured Municipal Securities Trust, 
                                   Pennsylvania Navigator Insured Series 1


                                   REICH & TANG DISTRIBUTORS, INC.
                                   GRUNTAL & CO., L.L.C.


                                   By:  /s/ PETER J. DEMARCO
                                      --------------------------------------
                                       Peter J. DeMarco
                                       as agent for the Sponsors

659792.1