Canon FD lens 300mm F5.6

I haven't confirmed its operation because I don't have a camera.
I used it occasionally for taking pictures of airplanes.
It appears to be free of mold, and there's no noticeable dust intrusion, but this is just a layman's inspection, so please understand that it's non-refundable and non-returnable.

◉Included Items
Outer box, protective filter, lens cap

※This item is a Canon FD mount. I selected EF mount because it couldn't be selected in the category. It can be attached to many mirrorless cameras using an adapter.

Product Description: (From Canon)

This new type of telephoto lens combines all lens elements into the simplest form, reducing the weight of the glass itself, and employing Canon's unique rear focusing system for focusing, achieving reduced mass, excellent operability, and mobility.
The rear focusing system, which moves the rear lens group back and forth for focusing, allows for lighter and smoother focusing compared to general telephoto lenses that extend the entire lens system. It also has many excellent features, such as "the overall length of the lens does not change during focusing, providing good balance with the body and superior operability" and "a shorter minimum focusing distance."
Furthermore, the ideal power distribution achieved through new optical design technology corrects various aberrations well, even in the simplest form, and achieves excellent image performance with high resolution and high contrast. In particular, the fluctuation of aberrations at close distances is almost completely eliminated, thanks to the rear focusing system, and it has succeeded in achieving high descriptive performance that is uniform across the entire screen from close to distant ranges.