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Look at the feed ramp of the " unissued" Carbine.
I have seen other like new 75 year old pieces from manufacturers who left feed ramps in the white and there was always some toning to actual patina....

In my opinion, something 100 years old that looks "new" and has crisp markings, coatings, no discoloration, no waves or scuffing at the sharp edges is very suspect.
Metallurgy alone tells us this is...