The LAPD also used the 68, with slightly different markings. The 68 wasn't issued though. It was a special order through the LAPD Revolver Club, with officers allowed to carry after "neutering" (DAO conversion) and being put on your gun card in the Armory. The 68 pictured has my old patrolman's badge and initials engraved on the sideplate. If you look closely, you can see where "68" is stamped over "66" on the frame. I also had a Patridge front sight installed at the factory for bullseye shooting.
Bob