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Pennyweight (Troy), mass
A pennyweight (symbol dwt) is an obsolete unit of mass which is the same as 24 grains, 1/240th of a troy pound, 1/20th of a troy ounce, or approximately 1.555 grams. A penny coin was literally, as well as monetarily, 1/240th of a troy pound of sterling silver.
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Metric
Avoirdupois (U.S.)
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