I hope the pictures are clear enough. Looks like somthing going on with the date also, but can't make it out, just doesn't look straight (in line) to me. (was this punched with a small d and then fixed???) ...c-ya
Nice find there. Looks like RPM-001. This was actually a triple punched mint mark, but in late die states the south spread is not visible. Looks like you may have a late die stage as I don't see anything to the south.
Good eye. I looked with my loop and I don't see anything to the south. I do see late die state on the 4. Thanks. ...c-ya