A coin struck on a blank that was not properly centered over the anvil, or lower, die. Coins that are 5 percent, or less, off center are graded as a regular coin. Those struck off center more than 5 percent are graded as error coins. PCGS puts an “E” before the coin number to designate an error specimen, and both PCGS and NGC list the amount struck off center, rounded to the nearest 5 percent.
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