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I'll suggest these are only suitable as ornaments for a lounge or shop now - they are way past their use-by date. No value as museum pieces as they aren't historically significant, nor are they collectible - unlike a Questar.
The mirror coatings will have oxidised by now, the tube is questionable and the rest thoroughly outdated.
And that's before getting to the topic of optical quality. I had a look through two in the early 1980's and they were not a match for an orange C8 that I had at the time. Secondly the ones I saw had corrector plates without antireflection coatings, so there goes 15-20% of the light for starters.
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