Okay, clearer head this arvo (afternoon).
The original Model 27 was entirely John's work, and I bought one from his company in the late 60s as being 'cooler' than a Hoyt while I was in Police Science at JC and a member of their PPC team. Within n a year I built my own Hoyt, Spring and all tempered in Mom's oven and oil quenched, without a Hoyt in hand to copy!
That holster was part of my portfolio when I interviewed with John age 20. For $2.00 an hour. Which was a pay rise from being a security guard. I started out at Bianchi in the police holster section, and the volume version of the 27 (see a Safari Ltd catalogue for the early version I had) was a big part of what we did.
But criticism came back from LAPD and CHP that the K frames swam in them. Understandable, it was for N and Python frames. And one or both agencies wanted a thimbsnap like the Hoyt already had, to keep the hammer from being cocked in the holster by a uniformed elbow. And fraying said uniform shirt elbows.
Remember that such a high riding, vertical carry holster was all-new to large agencies then. Even the Hoyt was positive caster (grip forward) carry.
So the 27K was created for the smaller revolver, and more leather sculpted away from the base of the trigger gua d because of the interference with a good grip mentioned here.
But these had already been issued, so how to retrifit them? Si I created the thumb snap you know now; and made it a n two pieces joined with the outer snap Botton to get good cutting economy. Sure, we 'sold' it on the dummy snap notion; but that's not why it was created.
Many more hidden stories in all of my designs for Bianchi and later, at Nichols Innovation for 30 other holster companies. One of those stories, told to the judge assigned to mediate the case, won a lawsuit for me.
Yes, there were mini 27s for three inch J frames and narrow belts, created for the NYPD bids that we never won. Their resemblance to similar Berns-Martins is striking, given that I'd didn't know of them until this century.
Perhaps it really IS the Devil who is in the details.