Die Errors: The process of minting coins involves dies that impart the lettering, numbers, and images onto the surface of a coin. One die is used for the obverse (front, or “heads” side) of the coin, and other is used for the reverse (back, or “tails” side). If there is an issue or flaw with either die, it can lead to errors such as the doubling of design elements or the mismatching of two dies. The latter case results in what is known as a “mule” coin.
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