Rare M-System 50mm lens.

Olympus lenses were tagged with the OM-System name, but only a few with the M-System name were produced together with the M-1, before Leica force Olympus to change the "M" designation to "OM"

The lens is in very good status. The aperture is dry, the aperture clicks work, the focus is soft and uniform and there is no fungus or marks on the glass.
Only some dust spots on the inside, something normal in old manual focus lenses. But this won't affect in a negative manner the photos.

Front and rear caps included.

Feel free to ask for more info.