Decimal Day
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Decimal Day was Monday 15 February 1971, when the United Kingdom and Ireland decimalised their £sd currencies of pounds, shillings, and pence.
An introductory pack of the new currency
British decimalisation training stamps in the same colours and values as the upcoming decimal stamps
A "Decimal Adder"
Along with a few other non-circulating coins, sovereigns (including half, double and quintuple sovereigns) survived decimalisation, and remain legal tender to date, though they have far greater worth as bullion coins and as numismatic collectibles than their face value.
£sd
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£sd is the popular name for the pre-decimal currencies once common throughout Europe. The abbreviation originates from the Latin currency denominations librae, solidi, and denarii. Under this system,
A sampler in the Guildhall Museum of Rochester illustrates the conversion between pence and shillings and shillings and pounds.
Old till in Ireland, with "shortcut" keys in various £sd denominations (lower numbers) and their "new pence" equivalent (upper numbers)
Toy coin, which teaches children the value of a shilling
Carolingian denarius