mercantile pound

mercantile pound
(lb merc)
   a historic English unit of weight, the mercantile pound (libra mercatoria) was the commercial predecessor of the avoirdupois pound1. Used from about 1100 to 1300, the mercantile pound contained 15 troy ounces2 or 7200 grains. This is equivalent to about 1.0286 avoirdupois pounds or 466.55 grams.

Dictionary of units of measurement. 2015.

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