Since it says "Mauser" on it, I would not overlook the possibility that it actually is a Mauser. If so, the next obvious question is, "What model?" If it is a blowback, that would make the 7.65 mm Parabellum an unlikely chambering, it's more likely to be a 32 ACP or some obscure cartridge if in that caliber range. I'll try to remember to look through my references tonight.
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