Steinheil Auto-D-Quinon 55mm f/1.9 normal lens. Made in Germany. Serial #2217559. Black finish. This lens will fit M42 Pentax screw lens mount camera's like the Pentax H1a, H3V, Spotmatic, and other M42 lens mount cameras. This lens can also be used on all mirrorless digital cameras like the Canon R, Fuji X-Pro3, XT-4, Nikon Z. Olympus Pen F, OM-D5 Mark III, OM-D1 Mark II, OM-1, I, Panasonic Lumix G7, G9, GH-4, GH-5, Sony a 6500, Sony a7SII, a7RIII with the proper adapter. Front filter size is 48mm. Minimum focus distance is less than 1.7' or .5m . Aperture range is f/1.9 - f/16. Focusing is marked in feet and meters. Lens has a semi-automatic or manual aperture. Lens is in Ex or 8 of 10 cosmetic condition. Good fairly clean condition lens barrel with some signs of prior use. No dings or dents. Fairly clean optics. No noticeable cleaning or coating marks on either the front or rear elements. Few small dust spots inside visible with a flashlight only. Smooth focusing. Good working lens aperture with no oil on the blades. Blades are smooth. Quite sharp and unusual lens with fantastic contrast and optical resolution. Hard to find in this M42 lens mount. Comes with an after market metal lens hood, and lens caps. Don't miss this nice shooter Steinheil Quinon 55mm f/1.9 normal lens in Pentax screw M42 mount. Sells with NO RESERVE at a price of $375. I have lots of more Angenieux and Exakta mount lenses, and other rare lenses in Exakta mount. Also accessories, 35mm Rangefinder cameras and lenses,  Medium and Large Format cameras, on my other Auctions, web page and E-Bay Store.