Brought this home from my mom's the other. Was in my dad's garage all my life. It's solid steel and looks like an anvil accessory or something. No markings on it
It appears to be a removable "foot" for a c-clamp body puller. We had a number of different styles that pinned onto the c-clamp for pulling on the frame rack. Sorry I don't have any photo's to show you of the complete puller. Autobody catalogs should have the pictures. Bill