The dime, in United States usage, is a ten-cent coin, one tenth of a United States dollar, labeled formally as "one dime".The denomination was first authorized by the Coinage Act of 1792.. The dime is the smallest in diameter and is the thinnest of all U.S. coins currently minted for circulation, being 0.705 inches (17.91 millimeters) in diameter and 0.053 in (1.35 mm) in thickness. More @Wikipedia
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