Machine Doubling or Die Deterioration, and can't be a RPM they changed how and when the mint marks are added so any coin minted after 1989 can not have a RPM. There is no Cuds on your coin. Cuds go from rim to rim. See attached link below.
https://www.error-ref.com/?s= Cuds
https://www.error-ref.com/?s= Cuds


























