Mystery vice

I got offered what seems to be a mill vice.



Only trouble is it's enormous. I don't think my bed would take the weight.



I declined the offer so it's still looking for a home if anyone is interested I can put you in touch with the owner.



It probably weighs over 60kg, two strong men struggle to lift this thing.



I'm kind of curious as to what it is. Perhaps someone here might have an idea.



I'm wondering if it might have come off a big shaper rather than a mill.



There's a rotating base plate and the moving jaw is a design I've not seen before.



There's no makers marks that I was able to find, only the chevrons near the fixed jaw.



Here' it is. If nothing else it's a curious thing to behold.