Terminology correction, it is not a misprint, currency is printed, coins are struck or minted. A Mule is when a wrong die is used on a coin. What you have is some sort of damage,( PMD) not sure from exactly what, but it looks like something has squeezed it from both sides.
It appears that the rim of the coin is distorted at the spots where the defect crosses the rim, or is close to it. PMD. It almost looks like a finishing nail.
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