1) Unit of mass
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https://www.crosswordclues.com/clue/troy-weight
Troy weight is a system of units of mass customarily used for precious metals and gemstones. There are 12 troy ounces per troy pound, (373.24 g) rather than the 16 ounces per pound (453.59 g) found in the more common avoirdupois system. The troy ounce is 480 grains, compared with the avoirdupois ounce, which is 437½ grains. Both systems use the s...
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http://en.wikipedia.org/wiki/Troy_weight
The basic unit is the troy ounce (oz), divided into 20 pennyweights (dwt); 12 troy ounces make one troy pound (lb).
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http://www.antique-marks.com/antique-terms-t.html
traditional system of weight in the British Isles based on the grain, pennyweight (24 grains), ounce (20 pennyweights), and pound (12 ounces). The ... [1 related articles]
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http://www.britannica.com/eb/a-z/t/85
Measured for precious metals like gold and silver. It has units of pennyweights, ounces, and pounds. Troy ounces and pounds are different from everyday US measures.
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http://www.encyclo.co.uk/local/22290
Traditional weight system used by goldsmiths, silversmiths and jewellers from 1526. The name comes from the town of Troyes, France, and was probably brought to Britain by Henry V, c. 1420. The basic unit is the troy ounce (oz), divided into 20 pennyweights (dwt); 12 troy ounces make one troy pound (lb). A troy ounce is about 10 per cent heavier tha …...
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http://www.encyclo.co.uk/visitor-contributions.php
Gold and silver are measured in Troy weight, a system that includes pennyweights, ounces and common goods are measured in. Gold is also commonly measured in metric grams
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http://www.indygem.com/pages/Glossary-of-Terms.html
Troy weight is a system of weight consisting of a pound comprising twelve ounces, introduced into Europe around 1095 by the Crusaders, and first adopted at the French city of Troyes. The Troy weight is used for precious metals and gem stones.
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http://www.probertencyclopaedia.com/browse/AT.HTM
A system of measure for the weight of precious metals. 1 troy pound is equal to 12 troy ounces or 240 pennyweights (Dwt) or 576 grains
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http://www.saffronart.com/sitepages/jewelry/glossary.aspx
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