One tell tail sign is the pin in the top of the rear toggle. It should be in the white and yours appears to have been blued which suggests a refinish. If the Russians dip blued it and the dip blue has been removed to show the original finish, it's possible that the pin still retains the dip blue.
The lack of halos around the barrel and frame serial numbers also suggests a refinish. If it has been refinished, it was a very nicely done job IMO.
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