I picked this up at a yard sale. Im seeing some sort of doubling, probably just MD but maybe not. RPM?
That's a comon characteristic of a rim clip. I can't think if what it's called right now but it always happens opposite of the clip
Looks to me as just a clip, the rest looks to be MD even the mint mark. Some RPM'S are tricky I have had nickels thought to be rpm and turned out to be md. Still a cool error coin as long as you're not in it to deep like 10 or less.