Now, that's the type of answer I expect from an officer ! I was a lowly Lance Corp., M.O.S 0331. '71-'73Yeah, 6 Actual works, too, as does 'Six'... (it had a wonderful tendency to immediately focus the attentions of the junior Officer/NCO at the other end of the handset...)
The Mershons are/were essentially identical to the Pachmayrs, but I think Pachmayr improved the metal clip later in time.
Pachmayr also contracted the 'S&W'-marked versions for the N, K and J frames - the J framed version not being quite as common as one might think.
Most of the revolvers I've run across seemed to have Tylers.
I always liked the grip adapter idea - installed, the weapon's carry size is the same, while the custom wood stocks, or the wrap-around rubbers made the piece larger - not the best of ideas when you're carrying concealed, plus, the rubber versions want to 'catch' on the coat fabric - further illuminating the fact that you're strapped.
Now, if you're truly nostalgic about your older cop/gumshoe stuff - you 'need' a Mershon, and probably a Clark 'Sheriff' holster to complete that LAPD Robbery Homicide look.(cue 'Harlem Nocturne' and the rising cigarette smoke, with the crushed-out Camels in the ashtray next to the empty shot glass and lipstick-stained napkin...)