Turret viewfinder (28, 35, 50, 85 & 135mm) with parallax correction (1m to infinity, manual adjust) for rangefinder cameras. Good addition if you change lenses frequently as it eliminates the need swap viewfinders. 

Used condition with some wear, good for actual usage. Clear and bright with a speck of dust or two, invisible during actual usage. Slightly off focus otherwise all is fine.

Goes especially well with the soviet Kiev RF cameras (Contax copy) and any cameras with hot-shoe.