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It may be an Erfurt receiver because of the acceptance stamps, which are not complete. Two alignment crowns are there but inspectors never completed the process by adding their stamps below these two crowns. The barrel may be a nazi replacement becuase of the later "stick eagle" proof and the "S/42", which usually designates a replacement part.
It is not a police pistol and the large eagle is a puzzle. It is clearly stamped and not engraved, so fakery would be very expensive.
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