I am rather interested in antiques and there are two things that are really important here
1: provenance: who had it/used it and can it be proven. An object can reach pretty high values, lets say a 1940 Conway Stewart fountan pen, but now if you can prove that a certain pen is the pen used by Winston Churchil, well, then that pen is worth much much more then any other 940 Conway Stewart fountain pen.
2: Original object, if the object dont work it doesn't matter, if the pen is the real pen with all the original bits and pices that Churchil used, then its worth a fortune, if its tampered with it loses value rapid.
I was once asked to make an estimate on a very old table and i was very excited because the table had the stamps of a very good and know Stockholm master. Problem was when i arrived the table had been sanded/restored and laquerd (clear), the table looked new. If the table have had the old finish produced by time and history it would have been worth around 250 000 dollars, now it was worth around 2000 to 3000.
This camera do have the two above, provenance and originality, if its restored it loses the time/history aspect and a great deal of the price. Dont change anything, it might have to undergo a conservation process, but that is the maximum that should be done with it. Dont destroy the history that this object contain, dont restore it.