table clamps -- for what?

[Branson]

Flea market finds here.   The one on the right held something -- dunno what.

The one on the left is blacksmith made, again some sort of table clamp, maybe nobody will ever know just what.  I can't pass up blacksmith made stuff.  The other one was next to it on the table, so it came home with its friend. 

But maybe somebody might have an idea?

[rusty]

There are so many things that were made to clamp to tables, hard to speculate...

One of many here:

[Branson]

There are so many things that were made to clamp to tables, hard to speculate...
One of many here:

Ain't it the truth!   The smaller one is marked in a diamond,

J.P. Co
NYC

The smithed one could be just about anything, from a common tool to a special tool put together by the smith.  But it is more distinctive, though apparently incomplete.  It's assembled in much the same way as 18th and 19th Century "table vises." (There are a couple of these in With Hammer in Hand -- the book on the Domini shop in the du Pont Winterthur museum.)