Coin errors exist when the mint has a problem with one of their machines that are used in the coin making process. Although coins are inspected thoroughly before they leave the stamping facility, sometimes problems occur which are hard to detect. If an error is caught before the coins leave the mint facility, they are usually melted back down and re-stamped, but occasionally coin errors do occur.
One of the most notable coin errors is the 1955 U.S one cent coin. An error occurred in the stamping process where the die was offset just slightly on it's second stamping process giving the look of the numbers not being directly on top of one another, almost like seeing double vision. Unfortunately a number of these coins were released to the public in hopes that no one would notice, but the error was detected and the value of the affected pennies skyrocketed. Today one of these pennies could be worth as much as $15,000 for examples that are in excellent condition and professionally graded.
Standard Catalog of Modern World Gold Coins 1801-present: 1801-present (Standard Catalogs)
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