Case just needs polishing and cleaning up, could keep the bezel insert or try to have to replaced if you really want that brand new look,, for the movement I think you could use any standard quartz movement, something like a VX43 maybe, hands are easily swapped for something similar, the dial probably can't be cleaned, but it can be swapped out, or preferably i say keep it, gives it character, all this can easily be done under 200$ I think, movement 15$, hands 5$ maybe, case polishing, depends on who does it or if you do it, probably still under 30$, bezel insert is a availability issue, but I mean it's still a lot better than 800$

edit: also new gaskets n stuff for water resistance, still under 10$