Nikon Nikkor 50mm F1.8 AI-S Manual Lens III -Long Version-
This is one of the hidden secrets of the classic Nikkor line. People often confuse it with the Series-E but this lens is much better. It is very compact and resistant to flare because of its recessed front element but the important thing is that stopped down it is probably the sharpest Nikkor available. This is the rare AI-S version.
This lens is in excellent condition and works well.
There is a very small cleaning mark on the edge of the front element, but I can't see it without a flashlight, it won't affect your image quality. Otherwise the glass is clean and scratch-free.