Ok well let's see what others say, but so far both @crazyb0 and I are kinda thinking that there may have been an extra scrap of copper plating that was caught in between the planchet and the die when the coin was struck.
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz