Any idea what caused the defect ?
Well for sure it was someone after this quarter left the mint. That makes this damage--interesting looking to be sure--but plain damage. My guess is that someone used a metal file on one side and was careful to remove about the same amount of metal with each stroke around the coin.
Added: in looking at the edge, you can see where the excess metal has rolled up onto it.
Also, welcome to CCF!
"The danger we all now face is distinguishing between what is authentic and what is performed."
Edited by Spence
05/21/2019 9:36 pm