What is a Nikkor-S? Back in the day Nikon had a system of letters for different numbers of elements in the lens. "S" is short for "Sept." which indicates seven elements. This lens is non-AI and fits old cameras like the F and F2. It will not work on any modern camera without an adapter, though it is great on mirrorless with cheaply available adapter tubes.
This lens is in good condition with moderate wear and works perfectly. There are a few fine cleaning marks on the front element but they will not affect your image quality. Otherwise the glass is clean and scratch-free. The focus is slightly dry, though not bad.