This gem was manufactured by Nippon Kogaku Japan during year 1965. It's a very high quality optical performer. It looks like new, and, if not, surely not much used but keeped in a long storage. Superb aesthetic, mechanical and optical condition despite the age. ------------------------- The optical schema has 7 elements in 6 groups and a picture angle of 62° on full frame. It has chrome front ring, filter ∅ 52mm distance scale graduated in meters and feet from 30 cm to infinity (∞). The particularity of this model is having a bayonet with no screws.