Ounce in older documents also Once (ounce)

Old unit of weight that persisted to some extent in Germany until beyond metrication in 1870. Its weight varied widely from place to place, ranging from about 27 to 100 grams. – The troy ounce (fine ounce) with 31.1034768 grams is still often used as a basis for the gold price today, although the ounce is generally prohibited as a unit of weight in the EU. However, the United Kingdom is allowed to retain its non-metric mass until further notice. – The fluid ounce is still widely used in Great Britain (= 0.0284 liter) and in the USA (= 0.0296 liter), but is not permitted in the EU as a unit of measurement in commercial transactions. Nevertheless, especially in the case of perfume, the content is often still indicated in ounces. Some French manufacturers of perfumes have therefore moved their distribution (PRO FORMA, on paper) to England, in order to continue to be allowed to fill in (which?) ounces and bring them into the EU trade. – See Troy ounce.

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