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A coin containing a minting error. [ f(reaks), i(rregulars), d(efects), o(ddities)
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A "misprinted" coin is called an "error coin". These occur when there is a malfunction of stamping machines or a case of human error. The result is a coin which is not perfectly struck or has a design flaw. In order to give an accurate estimate of value, the exact nature of the error must be known. Please examine your coin again and then submit a new question giving a description of the error.
This varies from several points of view:If the error is a mint error meaning something is wrong with such as a doulbe die error where the image or lettering appears to be doubled on the coin this could be very valuable to a coin collector. The 1995 penny has a double die error if you find one it is worth a lot of money for a 16 year coin.Also minting amounts, how many were made at a mint can affect the coin's value. For Lincoln pennies, there are three main mints that produce them. Philadelphia (no mint mark), Denver (D mint Mark under the date) and the San Fransisco mint (S mint mark). S mint marks are usually the rarest for a year of minting and thus have more value. Also, San Francisco stopped minting cents for circulation between 1956 and 1967, and again since 1975.So a coin doesn't have to be old to be valuable to a coin collector. But other factors affect its value and condition of the coin affects the value as well.In any case the minimum value of a coin that is no longer in circulation and not accepted as currency is that of the metal it is made of. For gold or silver coins this can be significant, but even copper coins (cents or pennies) have some value.
Coinage or minting.
Not if it is a modern coin. Modern coin minting equipment has the obverse (heads) and the reverse (Tails) dies "keyed" meaning that you can't insert an obverse die where the reverse die goes and vice versa. Because of it, it is impossible to have what most people think of a double headed coin. It is however possible to have what is known as a "Brockage" error where a coin gets stuck to the die and then the coin acts as a die for the next coin. This would mean that a coin could have 2 heads, but one side would be a reverse image of the other side.
It depends on the error, the best to do is take it to a coin dealer so it can be seen.