Alex,
It looks like there is a two-line import stamp on the side of the frame, and the pitting is on top of that. I think it is a Century Arms stamp, looks like LUGER PARABELLUM GERMANY / CAI ST. ALB VT.
Also, I don't see the Mauser hump. I do see what looks like a proof mark on the front of the trigger guard, suggesting it may be a pre-WWII Erfurt frame.
KFS
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