Thrift sale antique mystery. 

It's a dollar remover, It just removed a dollar from your wallet and you are now 1 dollar farther away from retirement.

It's a buckle of some kind.

It's a leather clamp

Looks like a large belt type strap would go through it and the metal spike would go through a hole in the belt, looks like an attachment for a horse is my guess

A great grandfather was a traveling blacksmith. Meaning, he traveled from NC to Winnipeg, then turned around, and did it again. Meaning, there a easily 2,000 things he did as one-offs.

Looks like a clamp for fabric. Or thin metal. Maybe for stretching it.

Could it be a jewelers brake/vice for bending metal?

Maybe to hold a leather strop🤔

It looks like a giant belt buckle, to hold a large belt or strap?

seam smasher for sheet metal

I'm thinking it's some kind of a clamp to hold like a knife blade for sharpening? Very curious as well.

I think it's a jig, I don't know what for but I'm pretty sure it's a jig for cutting or scoring materials

Damn interesting! Glad you found out what it was!

Looks like a horse shoe pry tool.

It's a henway. they are quite common.

Pack saddle buckle

I'm really curious