Why are we saying PMD? While I agree this does not appear to be an error, I would say there is a die gouge to the left of the MM and possibly a chip within the MM to the north... I don't see where this MM has taken a hit... IMO.
Nice pics Your coin doesn't match the RPM listed by Wexler and variety vista doesn't list anything. There is PMD in the field to the left of the mm (displaced metal visible). I think the mark under the upper serif may be from a hit as well. I think the mark inside the mm may be a die chip but not certain. It could also be PMD Regardless, I don't see anything that would suggest that it's a RPM