Pentax Super Takumar 55mm F1.8 M42 Screw Mount Prime Lens
This is a beautiful screw mount lens. It would be an excellent addition to a classic M42 kit or adapted to mirrorless. Some of my first lenses on my mirrorless camera were adapted from M42.
It is in good condition with moderate wear. There are a few tiny marks on the front element but I can only see them with a bright flashlight, they won't affect your images. Otherwise the glass is clean with no haze or fungus. The focus and aperture are smooth.