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Harper Roberts——Studied at the University of Oxford, Lives in Oxford, UK.
The avoirdupois ounce is lighter than a troy ounce; one avoirdupois ounce equals 28.349523125 grams. The standard gold bar held and traded internationally by central banks and bullion dealers is the Good Delivery bar with a 400 oz (troy-ounce) (
12.4 kg or 438.9 ounces) nominal weight.
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