Planchet errors
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Planchet errors are mint-made errors in the coin manufacturing process.
These errors occur when the wrong coin blanks, or planchets, are fed into a coin-stamping press. This results in a coin that has been stamped with a design intended for a different sized coin; this is called a wrong planchet error. In addition, unminted or blank planchets are occasionally produced. The results are usually obvious errors that are also prized by collectors, though the errors are usually caught in manufacturing and destroyed. Blank planchets with rims are valued lower than those with no rim. A Kennedy 50 cent coin struck on a Susan B. Anthony planchet is extremely rare. Sometimes you will find a Sacagawea dollar with a state quarter design on the back; this type of error is called a mule and unintentional ones are rare.