Bulova 1966 Minute Man

Here is another stump the panel watch.  It is a 10KT yellow rolled gold plate case with a textured bezel and a stainless steel back and M6 date code.   The dial is a deeply textured silver with recessed sub second register and applied yellow gold even hour markers with tapered sticks at the hour marker spot.  The case back has 2605 on the inside.   The movement is an 11AL 17J movement also with a M6 date code.  It looks to me like it could be a variant of the Engineer or the Craftsman possibly Senator but an ad has eluded me.  The crystal is cracked but until I find out what it is I don't think I can replace it.