A measure of Troy weight equalling 24 grains or the twentieth part of a Troy ounce (there are 12 ounces in a pound Troy). Pennyweight is usually abbreviated dwt.
Pennyweights to Long Tons (UK)
32ºF = 2735⁄32K
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A long ton is a British measurement and equivilent to 2,240 pounds. Not to be confused with the US "short ton"