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Coin Weights and Requirements under US Law – 31 U.S. Code § 5112

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31 U.S. Code § 5112 – Denominations, specifications, and design of coins (a) The Secretary of the Treasury may mint and issue only the following coins: (1) a dollar coin that is 1.043 inches in diameter. (2) a half dollar coin that is 1.205 inches in diameter and weighs 11.34 grams. (3) a quarter dollar … Read more