clamps from the museum

Check these out. When you absorb equipment cast-offs, it's often like an auction - you take everything in the batch and don't even know what all you got until you get it home. To wit, here is a pair of clamps that a guy was using for bar clamps. I'll put them in the museum wing. What are these, pipe clamps before PVC was invented? They must weigh nearly 10# a piece.

I like gripping them around the star edge and raising to warm up my shoulders. You never get that particular grip with bars.