Looking to identify clamping type vise

[ddcoy]

Weighs 65 lbs, opens to full 12 inches. No markings, no numbers, no manufacturing name. Was used by great-grandfather in 1800's in his duck decoy carving business.

[bl00]

It appears to be a Stephens. If you do a search for Stephens Patent vise you'll find a bunch of info on the internet. Yours is the first I've seen with the tall jaw surface of a woodworkers vise. Fisher (and others?) made a similar vise, although I believe Stephens was the original.