It's a forged (not a forgery) clamp. the pin on the end can either be put in a hole in the side of a part/casting, or positioned on top. The slot can be slipped over a bolt to be secured to the table or some other fixture.
Daryl and Tom are correct. It is a hold down clamp from the old days. I say that, people still use them today! Used to have a couple left over from dad's shop here some where.
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