The Mamiya Sekor Auto 55mm f1.4 M42 Vintage Prime Lens is a standard lens with an auto focus feature. It has a maximum aperture of f/1.4 and is compatible with Mamiya and Pentax brands. The lens is a screw mount and has a focal length of 55mm.
The lens in fair condition, it does show its age. Focus works fine, aperture as well, there is bit haze on the front element, some blemishes on the rear element, and a small fungus spot on the rear element. That being, optically it still performs, quite well.
See test shots taken with Sony a7Rii.