@Mr Wonderful
That's a "parts vise" and that's a great thing for you! The center nut for the base on a 6" goes for about $50 anywhere I've seen one. Those lock downs look great and are another $50 for the pair. The main spindle nut is $25 all day. All of these can be marketed nationwide and shipped cheaply. Less so is the spindle but there are buyers out there for the $75 range. The dynamic doesn't look awful but guys are not really buying main bodies as it is hard to get your half and their half to match up age and use wise. That said... If you can get that swivel moving (off) there are a LOT of broken ones out there with guys trying to force theirs and need it replaced. I'd start listing on EBay for the smaller parts. Hope that helps!
Good luck on the Reedsman! GREAT Vise and worthy of the hunt!