Your title caught my eye. A mule is considered a type of error coin. It has an obverse (heads/front side) design and a reverse (tails side) design that wouldn't ordinarily go together on the same coin such as the front is a normal Lincoln Cent with Lincoln portrait but the back is the reverse side from a dime such as here. These are quite rare so its generally not something that people will come across but can be quite valuable if one is found. https://www.PCGS.com/news/mule-mint...s-the-rarest
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