Pennyweight
Unit of mass
Pennyweight
A pennyweight (dwt) is a unit of mass equal to 24 grains, 1⁄20 of a troy ounce, 1⁄240 of a troy pound, 48⁄875 avoirdupois ounce and exactly 1.55517384 grams. It is abbreviated dwt, d standing for denarius – (an ancient Roman coin), and later used as the symbol of an old British penny (see £sd).
Read on Wikipedia · Image The Portable Antiquities Scheme, Lindsey, 2017-04-06 12:03:48, CC BY 2.0
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