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Some errors are known by multiple names, e.g. filled die errors are also known as missing design element errors and as strike throughs. Some errors, such as an off-center strike, are unique. Other errors, such as those resulting from a specific die crack, form a variety, i.e., a group of coins with distinctive details or characteristics.
Before 1990, all US coin dies were subject to mint mark errors resulting from the preparation of the dies. The mint mark was hammered into the die manually sometimes causing a die to have a doubling. In the minting process this would create a series of coins with a distinct of slight doubling of the mint mark.
Jefferson nickels have been minted since 1938 at the Philadelphia and Denver mints and from the San Francisco mint until 1970. Key dates for the series include the 1939-D, and 1950-D nickels. The 1939-D nickel with a mintage of 3,514,000 coins is the second lowest behind the 1950-D nickel.
Some of the rarest and most valuable coins in U.S. history owe their worth to minting errors that slipped through unnoticed. Coins like the 1943 Copper Penny, struck in copper instead of wartime ...
Pages in category "Mint-made errors" The following 12 pages are in this category, out of 12 total. This list may not reflect recent changes. ...
With a metal such as nickel, which is harder than a normal coin metal like silver, gold or copper, the pressure must be greater. When a nickel coin, or any coin, is struck, the metal must "flow" into the contours of the front and back dies. It is through the atoms of the metal flowing into the dies that flow lines are created.
The proof and mint sets are manufactured each year and contain examples of all of the year's circulating coins. The producing mint of each coin may be easily identified, as most coins bear a mint mark. The identifying letter of the mint can be found on the front side of most coins, and is often placed near the year.
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