Up for sale is a used, manual focus Olympus OM System 18mm f/3.5 wide angle prime lens, serial #102464, which comes with front & rear caps.  I don't see any fungus to the glass, but there are numerous scratches to the entire surface of the front element, so I've listed it for parts/repair since I'm sure this will have at least some effect on image quality (the scratches show up best in the photos where the glass is backlit--I've shot it in quadrants since the lens' construction won't allow the entire surface of the front element to glow simultaneously when backlit).  Focusing is smooth, with close focus down to 10"; the diaphragm is likewise functioning smoothly with no oil on the aperture blades.  Cosmetically, there is minor to moderate wear to the barrel from age and previous use, but overall the barrel is in better shape than the front element (which makes me wonder if the lens was really used all that much, or if perhaps the previous owner just let it jostle around in their camera bag for years without a front cap on).  Please be sure to fully enlarge the provided photos, and feel free to contact me with any questions you may have.