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Exact numbers in grams: ordinary pound(in this case a pound of feathers) = 453.59 grams
a pound of gold(which is not measured ordinary way 373.24
In Troy system an pound weights 12 ounces

The Troy system was used in history to measure precious metals, drugs and gemstones, and the ordinary pound is 21% larger than a pound of gold

Not the answer I was looking for, but I'll give you an up vote for coming up with a different angle on it.

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