Top 10 Most Valuable U.S. Coins Found in Pocket Change (about.com)

There are a number of fairly valuable U.S. error coins and die varieties in circulation today. These coins are overlooked by people because they have small distinguishing characteristics, such as a modest doubling of the coin image, or minute differences in the size or spacing of the letters in the legends. Learn which of your pocket change coins is worth a large premium over face value, and why. . . .

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