SN 37175. Lens has M42 mount.
Lens is in good condition. Even though front glass coating has lots of very tiny scratches. It shows normal wear on exterior. Filter rim is bent little bit, but it accepts filters (lens will be mailed with Vivitar sky filter). Front Glass has lots of very tiny, hairline scratches. Most likely caused by cleaning or rubbing the lens. I don't see any fungus or haze inside the glass. I don't see any dust specs inside. Glass looks good over all. Scratches on the front coating do not affect image quality.
Performance:
Lens has no known issues. Focus works good. Aperture works well as well. aperture blades are snappy, not slow. 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 and original Pentax Asahi sky filter.
Lens is sold with one month warranty.