This lens was an M42 screw mount lens and at some point in the last 50 odd years someone has glued a Pentax K mount adapter onto it. I do not think this mount can be taken off the lens so the lens is now a K mount lens :o) Caps supplied .. No optical fungus no scratches and no haze .... there are the usual dust specks of course. The iris works perfectly and it`s a pre-set iris so perfect for using adapted to digital and the blades are clean . The focus is smooth and nice and grippy. Only normal signs of use to the exterior barrel , a nice example . Free UK P&P ( costing me £4.50 )