Glass is fungus free with no "cleaning marks", oil free diaphragm with distinct click stops, in smooth brass focusing mount but no camera attachment fitting.  I believe this is the internal of the normal lens for the Olympus Ace camera, but lacks the bayonet attachment, however I'm guessing having never owned an Olympus Ace camera.  It would make a fantastic enlarging lens for a 35mm photo enlarger as the brass focusing ring could secure the lens to a lens board.  Please examine the photos and take note of the condition description as this lens is sold as described and is not returnable.