Contax Carl Zeiss Sonnar T* 135mm f2.8 AE.  Item is in an excellent, used condition with no internal fungus or haze and very minimal dust which will not effect the image in any way. The cosmetic appearance of the lens is in superb condition with no marks or scratches on it. Superb example of this lens. 

Ref Contax/Leica Lenses (sor-18-0746)