My sister has started to repair horse harnesses as a sideline. Much of the sewing is done by hand using an awl and this bench-mounted harness sewing vise or clamp allows positioning and holding the work perfectly. The harness is held at working height in the clamp and the tightening and releasing mechanism is foot operated. All in all it's a very nicely made and handy device still as useful as when it was made.
No manufacturer's name on it that we could find.