Yep, it's technically a Mint error, but it's a very common one though. It's a plating issue that was very common in the 1980's, when they switched over to Copper plated Zinc planchets.
I'm not sure I would call it a mint error. It is a problem created in the fabrication of the planchet and the plating. But thed the planchets are not made by the mint nor do they do the plating.
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