Irish pound introduced UK versions. When the UK 5p and 10p coins were reduced in size, the Irish followed suit, but the new Irish 10p was smaller than the new UK version introduced in 1992 and the new Irish 5p was slightly larger than the UK version introduced in 1990. The Irish 50p was never reduced in size (as it had been in the UK in 1997). 31 December 1998, the exchange rates between the European Currency Unit and the Irish pound and 10 other EMS currencies (all but the pound sterling, the Swedish krona and the Danish krone) were fixed. The
Decimal Day officially authorized the United States as the first English-speaking nation to have decimalised currency, although Tsar Peter the Great used the concept for the Russian ruble close to a century earlier, in 1704, while China has used such a decimal system for at least 2000 years. The United Kingdom's Parliament rejected Sir John Wrottesley's proposals to decimalise sterling in 1824, which was prompted by the introduction in 1795 of the decimal French franc. After this defeat, little practical progress towards decimalisation was made for over a century, with the exception of the two-shilling silver florin (worth of a pound) first