Quote:
"Dollars, or units; each to be of the value of a Spanish milled as the same is now current, and to contain three hundred and seventy-one grains and four-sixteenths parts of a grain of pure, or four hundred and sixteen grains of standard, silver."
"Eagles each to be of the value of ten dollars or units, and to contain two hundred and forty-seven grains and four eighths of a grain of pure, or two hundred and seventy grains of standard gold."
--- Sec. 9, Coinage Act of 1792, January 1792
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According to Title 31 of the U.S. code, a silver dollar complies with the original Coinage Act.
31 USC Sec. 5112. Denominations, specifications, and design of coins
(e)(1) ...weight 31.103 grams;
(e)(4) have inscriptions ... 1 Oz. Fine Silver ... One Dollar
FYI : a "double eagle" is a one ounce gold coin, face value $20.