Lens SN 649549, it has Olympus OM mount. Please note that this is all manual lens, manual focus and manual aperture. Lens comes with used front cap as pictured. Rear cap is missing. Lens will be shipped as pictured, so please look at the pictures above. Shipping is free within USA and $35 via USPS first class air mail service worldwide. You can choose faster (and more expensive ) shipping if desired during checkout. Cosmetic Condition: Lens has been used. It shows light wear on the lens barrel from use. I don't see anything damaged, no dents, cracks, etc. Glass is very clean. I don't see any scratches on the front glass. I don't see any fungus or haze inside. I don't see any dust particles, lens is very clean. Aperture blades are snappy and free of oil. Manual focus is smooth, without any play. Filter threads are not damaged. Everything works good. Lens has been fully tested by our tech guys. I guaranty that it will arrive as described or your money back.