[Arran]

I'm not sure about the clear capacitors, they used a lot of those in German radios for the 1950s and 60s but I think that they were plastic film and intended to be a substitute for some mica caps, polystyrene film possibly. The voltage ratings are not as high as either mica or most paper caps so they only used them in some specific locations, the rest they would use those black Ero caps with the brown paper labels which definitely need to be replaced. The mustard coloured caps with the ceramic coating were a Phillips product, those are usually still good, they are not paper inside, I would leave those unless the unit still has a fault. Sprague came out with the "Orange Drops" back in the 1960s, and whilst they were some of the best capacitors available in their day, and still are good, they continue to have a cult following and are priced well above where their equally good competition is priced because of it. In spite of what the myth followers believe they are not infallible, no capacitor brand is, if they were in situ in a piece of equipment I would not replace them without a reason, but there isn't much reason to choose them over something like Panasonic brand caps for replacing Aerovox wax caps for example. One cap that I would keep tabs on are the ones in the AM and FM IF cans and discriminator transformers, those appear to be of the Miller/Automatic K-tran style cans with the cheap mica sandwiches in the bases, if the set seems deaf on either AM or FM, or less selective, those are worth investigating unless Fisher cans are different then the typical ones.
Regards
Arran