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In page Shilling:

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The common currency for Great Britain, created in 1707 by Article 16 of the Articles of Union between England and Scotland, continued in use until decimalisation in 1971. During the Great Recoinage of 1816 (following the Acts of Union 1800 that united the Kingdoms of Great Britain and Ireland), the mint was instructed to coin one troy pound (weighing 5760 grains or 373 g) of sterling silver (0.925 fine) into 66 shillings, or its equivalent in other denominations.[citation needed] This set the weight of the shilling at 87.2727 grains or 5.655 grams from 1816 until 1990, when it was demonetised in favour of a new smaller 5p coin of the same value.