I've got a big columbian post vise, with 6" jaws. My brother would like one (this one was my Grandpa's) so I keep my eyes open when they sell. On auctions, the smaller ones like yours seem to bring $100-$150 if complete and not too beat up. The larger ones will bring $200 for a pretty rough one, all the way to $500 for superb one. Columbian does seem to be one of the most sought after brands.