I get the feeling that it depends on the quality of the original mirror. I bought a many-hand C8 that is probably early 80s vintage. It would seem to be the original mirror, unchanged. I think it looks great and performs well.
I understand that SCTs, being enclosed, should keep their primary and secondary mirrors in good condition for longer than reflectors - presuming the inside is kept dry and moisture isn't allowed to build up?
Edit:- put the call out for an expert from the site to come with you to check out a prospective purchase?
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