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 excellent +. The glass is excellent with just a trace of dust but there is very slight balsam separation around the rear element, right at the edge (see photo 4). This is totally covered by f4.5, and probably will not affect images even wide open. It most certainly is not a major problem. This is still a great lens. The lens is supplied with both caps.
This lens is offered at a lower than usual price due to the minor balsam separation. It works, it is fairly cheap for one of these lenses, but it is not quite perfect.