@rip, first welcome to CCF. Second, while that "rippled" surface texture is pretty cool, I suspect damage rather than a mint error. Maybe excessive heat?
"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
We see coins like this all the time. There isn't any minting process that could create this. It only leaves damage after minting as the answer. No one day precisely what caused it. It does look to be be damaged by acid but that is only a guess. There are some great websites on errors. I highly recommend researching them to learn more about the subject. I learn something new every time I go there.
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