This is a slightly modified Vergez Blanchard professional leather stitching clamp, used for holding one's work steady so both hands can be free for stitching (a common shoemaker's or saddler's technique). It can be used as it was originally designed, by applying knee pressure to the outside of the two jaws; or (for younger learners or smaller craftspeople, especially), there is a wooden screw that can tighten the jaws to hold your workpiece.
I am a shoemaker, and this one has been in training apprentices, so it has been cut down to about 28" tall. It is also flat on the bottom, so it can be used straight up and down whilst sitting on a stool. If you are getting into leatherworking, you will find this to be an essential tool,...and at the right price. Thanks for helping me find this a new home. $45 or best offer, plus shipping and it is yours.