I have a Componon-S from the early 1980's which I have had to "retire" to paperweight duties
Visually, it looks clean, with no scratches or dings.
However, I found it focus shifted when it was stopped down - but not by too much and of course you can just focus in the stopped down condition.
The killer for me was lens flare - which surprised me - and is not easy to detect.
I only found my lens flared when I happened to compare it to another lens.
The resolving power of the lens was unaffected by these flaws and remained very good.
Personally, I would spend the extra money and buy the most recent one you can afford