Disregarding your mismatch Mauser frame assy, the top half is interesting. I believe that the C/letter on the right side indicates military inspection during WW1, but due to the lack of addition markings & proof on this side, not assembled as a PO8 during WW1. The left over spare receiver was then assembled as a commerical (C/N proofing) during the Weimar era and finally rebarreled to 9mm in the early Nazi era (droop wing eagle on barrel) and proofed (eagle on RH receiver). TH
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