This is a tiny and relatively fast wide angle lens made by Canon with an L39 screw mount. It would be an excellent lens for your LTM mount Leica, Canon, Voigtlander, or adapted to mirrorless. There aren't many full frame wide angle lenses that could fit in the palm of your hand like this one can, especially not with an f2 aperture.
It is in excellent condition with light wear and works perfectly. The glass is clean and scratch-free with no haze, fungus or other problems. The focus and aperture are smooth and the mount shows light wear.
A front cap is included. This is a nice one.