This is the standard lens for the K1000 and other manual focus cameras. The "nifty fifty" is far and away the best value lens and gives similar performance to high dollar lenses.
This lens is in good condition with light wear. There is a mark behind the front element but it is on the edge, it will not affect your image quality. Otherwise the glass is clean and scratch free. The focus is smooth and the aperture is dry and snappy. Get a good deal on a nice lens!