After viewing the assortment of images from the OP I'm guessing you are a collector of images as I am, vs. a collector of the gunleather itself. Personally I've made too much of it to value a holster on its own.
Here's Heiser's story, from catalogue no 23. It's as much legend as it is fact because not only is it from decades after Hermann's death but the company did not even make holsters in his time; it was his sons who branched into them because of the automobile (which they also tried selling).
Thanks Red for the story of the House
A little reflection follows:
I have been collecting Smith & Wesson since 1987. My passion for S&W revolvers pushed me to become a member of the SWCA.
By frequenting the forum I began to know better the world of traditional holsters and Gun Leather Makers.
I started to buy some examples of Heiser, Myres, Ball, Brill, Lawrence, Eubanks etc etc with great difficulty.
I noticed that a photographic archive or a catalog with the holsters I was looking for or purchasing would have been useful to support me.
With the help of your posts I started to understand something more, until the idea of opening this thread with the hope that other users would also publish images of their holsters with the numerical references present near the brand and with the catalog page where was described, when possible of course.
Since Heiser used to scratch the handgun models on the back of the holsters it was impossible to catalog the holsters by their codes.
I still hope that forum users will start participating in this thread by posting photos of the their beautiful holsters.
How nice it would be if together with the holster there was also the gun to which it is dedicated.