Nice "been there, done that" Luger...
It almost looks like blood splatter that seeped into the nose of a holster. It certainly is a nice 1938 Mauser Luger.
Numbers inside the side plate should relate (equal to or plus one) to the first two digits of the serial number.
Do you have any specific questions or issues?
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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