What is this?

Update:

Original Poster here. I'm now the proud owner.

The daughter is helping her aged father sell his home shop equipment. Met her nearby, didn't see his shop.

The center hole is 1in dia.

The remaining holes are tapped 3/8-16. Coincidentally, I picked up a mess of small toe clamps a few weeks ago that might work well with this plate.

The slots accomodate a 1/2in bolt with a 0.785in dia bolt head or washer. I may have to fabricate special
bushings because my rotary table has 3/8in t-nuts.
 
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