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I think it is a Boker 1056 made for and stamped with a hardware/barber's supply name on the front tang. Seems someone wanted to obliterate the name on the front, probably a new owner of the business,...

Interestingly, the last one pictured has a feature on the front tang discussed in an earlier thread. Seems the maker is obscured by the hash marks(looks like something and sons?), but Germany is...