I did pick one of these up in Rome about a decade ago. It was cheap (I think about $100) and came with the finder, everything in original packaging. I was mainly interested in the finder - so the lens was a bonus. I did a quick roll as a test - gave the roll to a 1-hour lab and strange pictures. Looked like really bad "fish-eye" shots - fuzzy, out of focus etc.
Some "optical analysis" revealed that one of the center elements was never installed!! Good thing, the finder was perfect (and they are good finders). I have had those lenses before and after the "Roman" one and they are not bad - but a VC 21f4 is much, much better - and comes with all the elements installed!
The lens was a black one, with a # 880808 or something like that - so it went to a friend who likes #8 on things - and he did not care about the missing element!