I don't think someone intentionally aged it. Assume it's a little bit worn, and owner had it reblued by a gunsmith in 1930s (just for example),,,, many people doing that on their guns in tool stage (even today). Since it's a tool, they did not care much on "correct" finish. Personally, I reworked a few SKS for fun (stock only, not metal. Original SKS stock does not look pretty in my eyes) . Currently, no one cares,,,, say, 80 years later, SKS collectors will hold my gun wondering why this one looks so special.
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