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Beginning in 1860 and continuing for several years, Britain replaced its copper coinage with bronze pieces. The copper coins (principally the penny, halfpenny and farthing) had been struck since 1797 in various sizes, all of which were seen as too large. Over time the copper metal wore or oxidised, or had advertising punched into it, and there were also counterfeits and foreign coins in

Symbols of ancient Roman monetary and weight units are brief designations of such ancient Roman coins as the denarius, quinarius, sestertius, as, as well as some other monetary, accounting, and weight units of Ancient Rome. They appeared during the late Roman Republic (264–27 BC) both on the coins themselves and in written documents; some were used until the 20th century, for example, th

A thaler, or taler ( TAH-lər; German: Taler [ˈtaːlɐ], previously spelled Thaler), is one of the large silver coins minted in the states and territories of the Holy Roman Empire and the Habsburg monarchy during the Early Modern period. A thaler size silver coin has a diameter of about 40 mm (1+1⁄2 in) and a weight of about 25 to 30 grams (roughly 1 ounce). The word is shortened from Joac

Troy weight is a system of units of mass whose origin is uncertain. By far the most common troy unit is the troy ounce (oz t), the standard mass unit for precious metals in industry and in trade; it equals 31.1034768 grams. The troy weight units are the grain, the pennyweight (24 grains), the troy ounce (20 pennyweights), and the troy pound (12 troy ounces). The troy grain is equal to th