Penny (Irish decimal coin) Penny (Irish decimal coin) The decimal one penny (1p) () coin was the second smallest denomination of the Irish pound. It was first issued when the Irish currency was decimalised on Decimal Day, 15 February 1971. It was the second of three new designs introduced all in bronze, the others being a half-penny and a two pence coin. All featured ornamental birds designed by Irish artist Gabriel Hayes on the reverse. The coin originally had a diameter of 2.032 centimetres and mass of 3.564 grams consisting of copper, tin and zinc. This was identical to the British decimal penny as
Coins of the pound sterling one-pound coin, depicts the entire shield of arms on the reverse. All current coins carry a Latin inscription whose full form is , meaning "Elizabeth II, by the grace of God, Queen and Defender of the Faith". In addition to the circulating coinage, the UK also mints commemorative decimal coins (crowns) in the denomination of five pounds. Prior to decimalisation, the denomination of special commemorative coins was five shillings, that is, of a pound. Crowns, therefore, had a face value of 25p from decimalisation until 1981, when the last 25p crown was struck. Ceremonial Maundy money and bullion coinage of