This sale is for a very good condition Mamiya RB67 90mm f3.8 C lens, fully tested and in perfect working order.
This lens is mechanically perfect, and cosmetically near mint. However there are several very small patches of light fungus inside, but these are very unlikely to affect your images. No other optical issues. The lens is supplied with both caps.
This lens is offered at a very low price to clear due to the fungus inside. It works, it is very cheap, but it is not perfect.