Lens has M42  mount. Please note that it seems to be teleconverter for telephoto lenses. 

Lens will be mailed without any caps, both caps are missing. 
Lens will be shipped as pictured, so please look at the pictures above. 

Shipping is free within USA and $10 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. Lens works good. It has no known issues. Lens glass looks very nice, it is free of fungus, or haze. Lens has no known issues. 

Lens comes with 90 day money back guarantee.