Once a piano gets over 60 years old, it is beyond prime, especially lower tier brands.
So the question would be, realistically, how much more "life" is left in it (i.e., the action, soundboard crown, etc.)?
I read where Fisher made some good instruments in their day but 1951 seems a bit past their prime.
It was completely restrung in 1993, new dampers installed, has a few new tunning pins, and has been maintained regularly since then.
I thought he did a pretty good job for such a small instrument.