This is a near mint condition Mamiya 645 55mm f2.8 S lens, including front cap but currently no rear cap (but I wil try and find one before shipping).
This lens has just been cleaned. Cosmetically it has absolutely minimal signs of use, and mechanically no issues except for very slightly stiff focus that has no real effect on using this lens. There is just very minor paint loss on the lens mount, as almost always with these lenses. Optically it is as good as you will get, perfect glass with no issues at all.
Now seriously hard to find; this is a superb lens and you will not easily find a better example. This is the very highly regarded S model – the later much improved N version optics in a metal body – perhaps the best combination you can get. .