Smith&WessonTearGas, welcome to the forum and we look forward to your photos. I've searched long and hard for a good maker marked sap and have yet to find one.
Pilgrim, I've never seen that model Heiser before, could you show the back of it ?
Dick, the brass and black snaps were used pre WW II, plain brown or black enamel snaps with HEISER DENVER stamped on them were first shown in catalog number 40, my example has a 1942 dated Heiser post card in it.
Here's two recent acquisitions. The combination pocket belt holster fits a 4" M&P and the other holster was made for a 1st series Match Target Woodsman and was special ordered without a safety strap.
Regards,
turnerriver