Yes something gritty enough to remove the higher parts of the copper plating, but smooth enough to not leave behind much for scratches in the zinc. If @t-bop is wrong, then perhaps 800 grit sandpaper? For sure, this cent didn't leave the mint looking like this.
"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
I have several of these across a number of years--mostly late '80s through the '90s. My best examples are in a Dansco generic cent album devoted to damaged Lincoln cents. Very cool.
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