Take the tuners out and keep them safe - they stay with the banjo. I believe you can get modern tuners that fit in the holes - try Elderly Instruments or Stewart-McDonald. This'll turn it into a banjo that's worth playing instead of a wall decoration.
Looking at some antique banjos on the websites of Elderly or Bernunzios or Mandolin Brothers could well give you an idea of what it's worth if it's put into good condition.
Cheers
Ray