Jared,

I have S/N 93034X in similar condition.
Mine has a "Pat.Appl For " bayonet adapter. The stock however was unmarked.
This may open up a can of worms but I do subscribe to the Winchester rework theory. I own a Model 12 riot that is U.S. marked with similar Punch Marks.

The blue is consistant to that of other Winchesters I own. Hopefully records will turn up someday of any Winchester Rework. Who knows maybe with a list os Serial Numbers !