I think it's the first IWB I have seen with a hammer protector.
Sorry, I don't have a clue who might have made it.
the Heiser image is turnerriver's
the Davis holsterThank you for that little holstery lesson Red. I have only been a student
for about 20 years, so I could write a book about what I don't know.
On a similar subject I read somewhere that Chic "invented" the covered
trigger guard? On the unusual holster thread I referred to the Crump
holster shown below marked Q37, and opined that it may have meant
Quantico 1937, and that Jelly Bryce was instructing at Quantico in 1937,
and that someone had written that Jelly had designed a holster with a
covered trigger guard. Do you have any holstery to add?

believe this image was supplied by Craig Smith Also just tried my 3913; excellent fit
By the way, my foggy memory tells me that Chic's favorite quick draw revolver
was an H&R Sentinel .22 with a 3" barrel.
You'll kick yourself. Hi-Standard Sentinel.
Safariland covered the trigger guard on their auto holsters in the 1967 catalog. Then, of course, there was the Berns-Martin Raider/Range auto holster and the Bianchi copy. 1966 date on this ad. Where'd I get that ...??
AND ... I whipped out my reproduction copy of Handgunner's Guide. Gaylord's "Commando" thumb snap holster for a 1911 is pictured with a covered trigger guard. 1960?
The connected straps on the OP's holster are unusual. I've seen that before, but where?