Robert and Al,
If this is an inter-war (Weimar) commercial, any number of things might have been done to it. I'd start by looking for a Crown/N proof on the left side of the receiver. From the look of things it appears that this Luger has ben reblued. Is there any evidence, such as a difference in the finish or a non-straightness or "dished" appearance, that the proof marks have been removed from the right side of the receiver?
--Dwight
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