I always enjoy seeing slightly different designs in old bar clamps. These two were found on eBay. The top one looks like the seller put the moveable stops on the wrong way though. Wait, Stops? Plural? I guess the seller really doesn’t know and put two stops on one clamp.
The bottom one reminds me quite a lot of the pair I made a while ago. If I could make wooden threads, maybe I’d go into manufacturing these, aging them and putting them up. Shipping would be murder, plus most of these don’t even get a bid.
-- - Ni faru ion el ligno!