This sale is for a very good condition Mamiya RB67 90mm f3.8 lens, fully tested and in perfect working order.
This lens is mechanically perfect, and cosmetically excellent+ with just a few faint marks in the paint on the knurled rings, as can be seen in the photos. Optically there is slight balsam separation at the rear (see photos), but this is fully covered by f4.5 so is very unlikely to affect you in any way. I have tested this lens on my RZ67 and I could not see any problems even with it wide open at f3.8. There are also two largish dust specks plus some fine dust that does not affect images – but it will need a clean at some point in the in the future. There is no fungus, haze or scratches. Not quite optically perfect, but certainly nothing that will affect your images except maybe under really extreme lighting conditions.