Mark,
It's a bit misaligned, but I believe the mark is S.Op.IV.221. and stands for Schutzpolizei (Municipal Police) Oppeln Administrative District, Precinct (or City) IV, weapon number 221. There was obviously an earlier mark that was partially ground off. I think I see a slash to the right of the IV. If so, it was probably a Weimar Army unit mark. Can you make out any more of it?
I share Ed's interest in learning more about this pistol. It apparently has no sear safety.
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