This is one I know about because no one at coin shops knew what caused it so I found why it has all those little scratches. It is caused by sandpaper they used to clean the dies. Some of it comes off on the die and when they start it back up that is where you get the scratches.
Worn die, diedeterioration, Mechanical doubling, MD (no value added) and I don't think they use sand paper. PMD. and one of mine.