I guess the OPs question was kind of answered.
The reality is that HH Heiser holsters is one of those on going questions we can't answer. The model number of the holster has absolutely nothing to do with the gun that fits it. Heiser made holsters for decades, and for any gun you wanted one to fit. The holster model related to the leather, the decoration, and the style. They often used a ball point pen to hand write the gun model it was made to fit on the back side.
When you're looking at one of their holsters, turn it over and hold the thing at various angles to the available light. Very often you can see the writing. Just as often, you can't make out what was written 60 or 70 years ago. If you can, it might not make sense to you as they sometimes used slang to describe the gun. Probably everyone back then knew what they were talking about, nearly no one today does. Just my opinion.
When you see the distinctive Heiser workmanship, take a little time to really look at the thing. If its not in a gun setting, sometimes the prices are shockingly cheap. It means its time to buy it. I picked up a nearly perfect Colt Woodsman holster one time for $20. Got talked out of it a few weeks later for a bit more....
Some of the best leather work I've seen.
My favorite is the one our poster Dewey sold me 6 or 7 years ago. It fits a 4" N frame with target sights. And its the only one I've seen with sheepskin lining. Second favorite was the mistake I bought. I was looking at a table full of Heisers, western style. And I wanted one for a SAA Colt. I was stupid and wasn't paying attention. The one I selected was in much better condition, it was a bunch cheaper, and best of all it fit my belly. So still not paying attention, I bought it. When I got back to our tables at the gun show, Hugh May almost fell all over himself. He asked what I had there, and correctly identified it as a 6" barrel RM holster, right down to the 357 cartridge loops and the leather rear sight block sewn into the inside. Boy did I feel stupid, except I didn't let on how badly I'd stumbled. Its a great holster for a long barrel N. And the Colt is long gone as would be the holster.
These are great pieces of leather to find and own. Just don't trust your judgment. Carry along the gun you need to see if it fits. Its pretty difficult to guess the frame size unless you're really good.
Here's the link:
https://www.vintagegunleather.com/sold-items.html