Had this awhile, hung it up above the bench.   Appears to be 2.5 inch track adjustment wrench.   Looks just like the ones used on M-48 army tanks, referred to as a little joe wrench.

I must be blind, I'm not seeing any wrench.

Well, pic comes up, but is the wrong one when it posts.   Now when I retry the correct pic is gone,  scratching head``

I see "little joe" now.  I would have said it was a one-off self made wrench.

That's way more better