SN 2404766. Lens has PK mount. Lens is in an excellent condition. It shows light wear on exterior. Filter rim looks good and it accepts filters. Front Glass does not have any visible scratches. I don't see any fungus or haze inside the glass. Lens has little bit of dust specs inside. Glass looks very nice over all. Performance: Lens has no known issues. Focus works good. Aperture works well as well. Lens looks and works well. Shipping is free within USA and $15 via USPS first class air mail service worldwide. You can choose faster (and more expensive ) shipping if desired during checkout. It will be mailed as pictured with both caps. Lens is sold with two month warranty and full money back guarantee.