VAN KAMPEN AMERICAN CAPITAL INSURED INCOME TRUST SER 73, 497J, 1998-12-21

VAN KAMPEN AMERICAN CAPITAL INSURED INCOME TRUST SER 73
497J, 1998-12-21

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                                December 21, 1998

Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C.  20549-1004
Attn:  Filing Desk, Stop 1-4

     Re:  Van Kampen Insured Income Trust, Series 73
          File No. 333-63491, CIK #897186

Gentlemen:

         In accordance with the provisions of Rule 497(j) of Regulation C under
the Securities Act of 1933 (the "Securities Act") this letter serves to certify
that the most recent amendment to the registration statement of Form S-6 for the
above captioned Trust does not differ from that which would have been filed
pursuant to Rule 497(b) of the Securities Act. Amendment No. 1 to the
registration statement, which was the most recent amendment to the registration
statement, was filed electronically with the Commission on December 17, 1998.

                                        Very truly yours,

                                        VAN KAMPEN FUNDS INC.