You have a damaged cent. Why can't you tell if something is off with the D? You have it in hand. I see nothing that makes me think RPM.
I'm with Larry - doesn't appear to be an RPM. Some damage to the mm may be obscuring things so with it in hand, you should be able to see something that we cannot.
Sometimes it is hard to tell I am with you guys most of the time just making sure I am not seeing something else that is all. Don't want to pass something up that really could be something I'm new I will learn the difference just taking me a little time that is all thanks anyway.