Certainly any Vega Fairbanks banjo 100 years old is of historic interest and would be valued by collectors, much as would a Martin guitar of that age. Vega Fairbanks was the best. I mentioned Whyte Laydies and Tubaphones as these are models introduced by Vega Fairbanks about that time that are especially prized.

I don't know whether you've owned the banjo for some time or just come into possession of it. In any case I would say the first thing to do is identify the model and get it appraised. Possible of course is that the banjo has been slightly or extensively modified: that happens to banjos more so than guitars. If the issue is its unplayable as the tuners are loose, I would say a good banjo restorer could fix that problem using the current (possibly original tuners) In any case, due to it vintage, I would say a banjo restoration specialist is needed, rather than run-of-the mill repairman.

I know the owner of the Music Emporium, in Lexington, Mass, has a keen interest in Vega Fairbanks banjos. I was in the shop one day when an old Vega Fairbanks was brought in and it was treated with reverence and awe.

As I know you own an Apollonio 12-string (and I have one too), let me say that Vega Fairbanks are in the same class as Nik's guitars.