What a great story and perhaps my favorite on this forum so far, beyond those that document holstorical dating.
Geez, John, you and I are going to end up on that "late" list someday. We're old and I'm not looking forward to it. When it happens, someone please mention that we had personal lives outside of gunleather, including families!
FYI that marking for the K22 is not literally 'scratched' into the leather but marked onto it. I make the distinction because we leather workers use scratch awls, which are sharp-ponted and leave rough, permanent marks; whereas yours were made with a ball-ended tool called a stylus, that left a removable mark while the leather was wet. Myres did this too, sometimes using a ballpoint pen when they first appeared.
In the image a young woman is using the stylus to transfer an engraving pattern from a transparent film, onto wet leather. Can't be scratched on this way, m/b a stylus instead and even a ballpoint pen or a pencil works.
Red, unfortunately, we ALL will ultimately end up on the "late list". I should have said in my story that I also had learned here on the forum how the "scratching" was done by the factory….probably from you. I described it as scratching because I distinctly remember the Red Wing Boots store guy describing it that way.
I also find the dating of Heiser Holsters interesting and confusing just for the reasons you listed above. Why in the world they did things like using different maker's marks at the same time, crazy numbering systems, and different hardware sure makes things difficult for us collectors and those interested in history. I mean they should have been thinking about us future folks, profit be damned!


To add to this discussion, I have a "new to me" Heiser holster heading my way that is a little different from my norm, but should add to this confusion.

Larry