I think its just machine doubling, but it could be something else. Its hard for me to tell with my setup atm. Having to use an s8 with my microscope till i get a new monitor
Mechanical doubling. By the way.. You would say Doubled Die.. Not double die Quote - "Note that the proper terminology for this occurrence includes the letter 'd' at the end of the first word, hence "doubled die". The term "double die" without the first word ending in 'd' is not proper numismatic terminology." Closed quote https://en.m.wikipedia.org/wiki/Doubled_die
