Scout: condition of that one doesn't look too bad from the picture cause surface rust can be easily removed. as far as value you'd have to get us measurement of width of jaws (not how far they open) and weight to maybe give you a better idea. if it's a 4 inch wide vise then $50 would be an ok deal and probably worth more. if it's a 6 inch wide jaw vise then $200 might be an ok deal and value maybe a bit more.
more details and better advice so if you have access to some let us know or have fun.
also BEWARE the vice for vises addiction is real!!