DEAN WITTER SELECT MUN TR INS CA INTERM TERM PORT SER 12, 497J, 1996-04-18

DEAN WITTER SELECT MUN TR INS CA INTERM TERM PORT SER 12
497J, 1996-04-18

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                                             Rule 497(j)
                                             Reg. No. 33-50977
                                             Reg. No. 33-50275    
                              

Pursuant to Rule 497 (j) promulgated under the Securities Act of
1933, the Registrant, Dean Witter Select Municipal Trust, Insured
California Intermediate Term Portfolio Series 12 and Delaware
Portfolio Series 14, hereby certifies as follows:

1)   the form of prospectus that would have been filed under
     paragraph (b) of Rule 497 does not differ from that
     contained in the most recent amendment to the registration
     statement, and

2)   the text of the said amendment to the registration statement
     has been filed electronically.

                    DEAN WITTER SELECT MUNICIPAL TRUST,
                    INSURED CALIFORNIA INTERMEDIATE TERM         
                         PORTFOLIO SERIES 12
                    DELAWARE PORTFOLIO SERIES 14
                             
                    By:  Dean Witter Reynolds Inc.
                         (Depositor)


                         Thomas Hines             
                         Thomas Hines
                         Authorized Signatory