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The standard British troy pound manufactured in 1758; it bears the abbreviation ℔ ("pound") and the letter "T" for troy. The troy pound (lb t) consists of twelve troy ounces [15] and thus is 5 760 grains (373.241 72 grams). (An avoirdupois pound is approximately 21.53% heavier at 7 000 grains (453.592 37 grams), and consists of sixteen ...
At the time of the 1702 London Mint Assay by Sir Isaac Newton, the silver content of British coinage was defined to be one troy ounce of sterling silver for 62 pence, or 502 mg per penny. Therefore, the value of the monetary pound sterling was equivalent to only 3.87 troy ounces (120 g) of sterling silver. This was the standard from 1601 to 1816.
The Great Bullion Famine and the Great Slump of the mid-15th century resulted in another reduction in the English penny to 12 grains sterling silver (0.719 g fine silver) and the introduction of a new half-angel gold coin of 40 grains (2.578 g), worth 1 ⁄ 6 th pound or 40 pence. [46] The gold-silver ratio rose again to 40 × 0.719 ⁄ 2.578 ...
The weight of the English penny was fixed at 22 + 1 ⁄ 2 troy grains (about 1.46 grams) by Offa of Mercia, an 8th-century contemporary of Charlemagne; 240 pennies weighed 5,400 grains or a tower pound (different from the troy pound of 5,760 grains). The silver penny was the only coin minted for 500 years, from c. 780 to 1280.
In the Middle Ages, an English penny's weight was literally, as well as monetarily, 1 ⁄ 20 of an ounce and 1 ⁄ 240 of a pound of sterling silver. At that time, the pound unit in use in England was the Tower pound, equal to 7,680 Tower grains (also known as wheat grains). The medieval English pennyweight was thus equal to 32 Tower grains.
Since the pound sterling or 240 pence was based from the 12th century on a Tower Pound or 5,400 grains (350 g) of sterling or 0.925 fine silver, the English groat or fourpence therefore contained 90 grains (5.8 g) of sterling silver.
He defined the "libra" as a new measure of weight equivalent to around 408 grams [4] [a] (substantially larger than the old Roman pound of 328.9g), and ordered 240 silver units known as denarii to be struck from the new Carolingian pound of pure silver, each denarius containing 22.5 grains of silver.
New silver coinage was to be of .925 standard, with silver coins to be minted at 66 shillings to the pound weight. [5] Hence, newly minted sixpences weighed 1 ⁄ 11 troy ounce, equivalent to 43.636 grains or 2.828 grams. The Royal Mint debased the silver coinage in 1920 from 92.5% silver to 50% silver. [6]