Now I see what you are talking about. As Tommy and Markus pointed out, it's just damaged. Could have been from a coin wrapping machine or a well placed hit. After 1989 the mint stopped hand-punching the mint marks into the dies, so there are no RPMs after 1989.
Ok wow Ok.. I see what's going on now!. So do I pass the fourth grade now? just asking!!!. lol ty you all very helpfully, always learning something new!.