My guess is that they are salesman samples, used to show the variety of shapes they made. Blank, so they wouldn't get taken.
BTW, Disston is still around, but they don't seem to make files anymore. They are famous for their hand saws.
BTW, Disston is still around, but they don't seem to make files anymore. They are famous for their hand saws.
Full of ideas, but slow to produce parts