@wex, first welcome to CCF. Second, gripping a coin in the jaws of a machinist's vise will impart that regular pattern of diamond-shaped damage on the surfaces of a coin. As noted by @sc, that is not a mint error--just damage.
"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
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz