The mount is a Four Thirds mount, but it's an OM mount. ■ Item OLYMPUS F.ZUIKO AUTO-S 50mm F1.8 ■ Appearance There are no noticeable scratches or stains, and it has a clean appearance for a lens from several decades ago. *Please check the other conditions in the photos. ■ Optics There is large dust and debris inside the lens when a strong light is shone on it. Please check the photos. The last photo shows the lens attached to an OM10 and looking through the viewfinder. ■ Operation MF operation has been confirmed and there are no problems. ■ Accessories None. * Everything in the photos is included. Cameras, plants, etc. are not included. ◆◇Notes◇◆ ■ Even if it is a clean used item, it is still USED. 　The way the appearance and condition of the product are perceived varies from person to person depending on subjectivity, so please refrain from bidding if you are looking for perfection, are nervous, do not understand used items, or are a collector of new-like items. Mount...Olympus OM mount system