For sale is my Nikon Nikkor 50mm f/1.8 AI-S that is the strange Japanese market version of the lens. From my research... The serial number is 2245282, which puts in in the variants of the AI-S that were made with the Series E formula (very compact), but with the build quality and silver ring like the regular AI-S. Focus throw is long, tight and smooth as thick oil. A great match for a discreet, carry-around, manual focus Nikon camera. Harder to find lens, if you are into Nikkor lenses. This lens is in superb condition. No marks I can see on the lens. Comes with NEW modern Nikon front cap and translucent plastic back cap. Price is $110. Shipping to continental US only $10. No foreign sales currently. Pick-up in Manhattan and save the shipping cost.