INSURED MUNICIPAL SECURITIES TRUST 10TH DISCOUNT SER & SER 3, 497J, 1994-05-26

INSURED MUNICIPAL SECURITIES TRUST 10TH DISCOUNT SER & SER 3
497J, 1994-05-26

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    BEAR, STEARNS & CO. INC. 
    250 Park Avenue 
    New York, New York 10167
    (212) 272-2000

                                   May 26, 1994

    VIA EDGAR

    Securities and Exchange Commission
    450 Fifth Street, N.W.
    Washington, D.C. 20549

                   Re:  Insured Municipal Securities Trust, Series 3
                        File No. 2-97191

    Gentlemen:

              As Sponsor 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 April 19,
    1994 and became effective April 29, 1994 pursuant to Rule 485(b).

                                  Insured Municipal Securities Trust, Series 3


                                  BEAR, STEARNS & CO. INC.


                                  By:                         
                                       Peter J. DeMarco
                                       Authorized Signatory