This is the classic 50mm f1.4 lens. The lens has been AI'd with a clean cut. 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 one is in excellent condition with light wear. There is a small mark on the front element, but it will not affect your image quality. Otherwise the glass is clean and scratch-free with no haze, fungus or other problems. The body shows moderate wear. The focus is smooth.
Caps are included.