Hi to all! I was thinking, always a risky thing for me to do, about holsters and how they were most likely stored, handled and issued during the pre war, and maybe early wartime period.
Now to start with, I've had just enough experience with inventory to know, that items have to be faced, and inventoried, to know what you have, and how many you have of it? If perishable, add rotated as well. The better you do, the more accurate it, your inventory, would be? And, everyone I've ever known hates doing inventory! ..

… So, I believe, (just me, no-one else has this crazy idea!) that the holsters were received in boxes, crates, or racks of holsters in a manageable size, say racks of ten, or crates of 20 etc. etc. from the holster manufacture? Maybe even more! But the thought to be considered is, it's easy to inventory 5 racks of 20 ea. rather then count 100 holsters in a box every day for each and every holster type, not to mention a 1000 other items that come and go on a daily basis. Now the reason I mention this possible method is that it would certainly influence how holsters were matched to guns as far as matching the date of manufacture.
This would account for some overlap in dates, but not the endless, and bottomless box where a 1936 holster lurks into 1942!
Now, pistols that were put back into inventory would be the deal breaker, as any holster that came off the rack would be it's new, correct matching holster, regardless of the date..
Most importantly, the reason this could work is the German militaries anal obsession with marking and tracking everything they made or captured prior to when things started going south on them, and even then it continued until the end!
These are the boys that most likely invented, inventory, rotating and facing items??? Just my thoughts, back to magazine repair! best to all, til...lat'r.....GT......