Back to the grip screws for a moment, I have seen a comparison of different grip screw profiles relating to different variations, but I can't track it down now.
I have had Lugers with varying width grip screw slots, on guns which are otherwise completely original and unmessed-with--there is every reason to believe that the screws were original to the guns.
The screws vary from manufacturer to manufacturer, Imperial to later, and military to commercial.
--Dwight
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