This antique lens was my Dad's. Rarely used, with his old Leica IIIc. It is a metal barreled 135mm F3.5, quite sturdy, beautifully finished and made by a long gone company that would become Nikon. Everything is manual of course. It makes an interesting 270mm lens! Looks neat, I will test it out on a nice sunny day to see what sort of birds and stuff can be photographed.