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[Oldguy51]

Thanks for all of the quick answers and information.
-I tried finding info on the grips and when I couldn't find anything I assumed they were some cheap replacements added by an importer just to try to make an old gun look better inexpensively. Same with the re-bluing. The "Russian capture" information changes my thinking about the gun completely.
-Thanks for info on S/N. Because of the manufacturer and the style of the letter I thought it stood for Mauser.
-Might there be any proof marks to indicate which Russian armory it went through?
-I have not disassembled it yet. Might there be any hidden proof marks I should look for?
-Thanks again. I think I'll leave it exactly as is for now with possible exception of walnut grips for when I shoot it.
Oldguy