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https://stairnaheireann.net/2019/02/15/otd-in-1971-variously-known-as-decimal-day-decimalisation-day-and-d-day-the-united-kingdom-and-the-republic-of-ireland-decimalised-their-currencies-2/
#OTD in 1971 – Variously known as Decimal Day, Decimalisation Day and D-Day, the United Kingdom and the Republic of Ireland decimalised their currencies