More common than most think as in the past the govt property markings tended to worry folks so they would deface the SN on the things and was totaly legal at the time. As its a pre 1968 gun and need not even have a SN and does have a number stamped over the old one I would not sweat it. Before 1968 you could grind a SN off and stamp piggy faces in place and it was totaly legal.
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