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The examples and perspective in this article deal primarily with the United States ... silver €10 commemorative coin ... Coin collecting; Coining (mint) Die defect;
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.
In modern presses, a die strikes approximately 120 coins a minute. This is a large number of coins produced in a short time, and obviously the die cannot last forever. However, the process of wearing the die is only hastened by the metals used in coins. Nickel, one of the main metals used in today’s coins, is quite hard and causes wear ...
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A die crack occurs when a die, after being subjected to immense pressure during the minting process, cracks, causing a small gap in the die. [3] If this damaged die continues to produce coins, the metal will fill into the crack, thus revealing a raised line of metal in the finished coin.
Some Mint State early coins appear to be circulated due to weak strikes, die cracks, planchet problems, or metal quality. There are a few United States coins for which no mint state specimens exist, [10] [11] such as the 1792 silver dime, and the 1802 Draped Bust (Heraldic Eagle reverse) silver half dime. [12] [13] [14]
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