Considering the age, repairs would likely be in order. Woofer surrounds often go bad and have to be replaced. Even tweeters sometimes have damaged surrounds and in their case new tweeters are usually installed that have equivalent or slightly better performance. Cross-over networks develop problems with variable resistor controls, deteriorated non-polarized electrolytic capacitors. Inductors seldom go bad though. If you know the performance they were capable of originally and like them, then you might want to undertake restoration. If not, you would likely be disappointed.
I restored my AR-2Ax speakers a few years ago and it included many items that had to be done including re-gluing the surrounds of the woofers to their masonite rims, rebuilding the cross-over networks and replacing the original dome tweeters with newer Hi-Vi tweeters per information from
http://classicspeakerpages.net/ which is a group specializing in restoration information on a few models and brands of speakers. I am not aware of anyone pursuing restoration of Fisher speakers to original specifications, although there could be a few who have done so. The issue for a restorer would be finding the information needed to restore a given model. It would require some good calibrated microphone(s) and a computer to analyze the performance of any replacement drivers or properly evaluating performance of repaired existing drivers etc.
Joe