Heavy metal clamp, painted red, only words on it are “PAT. PEND”

It's a ball clamp fixture like today's RAM mounts - a metal ball on a clamp or the like is put between the arms and it is moved to a position of convenience for the moment and clamped by tightening. Look up "universal vice" to see similar mechanisms.

Also to quote Roger rabbit. "Pat Pending! What a guy!"

It is 5 inches tall and weighs maybe 3-4 pounds. Has four holes on the base to attach to something. The clamp part is concave on both sides as if to hold something round.

Thanks for any help.

It's the base for an old pipe vise.

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Some sort of tool for stretching shoes?