Penny (Irish decimal coin) from 2002 on its own). 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
Indian rupee "athanni"; 50 naye paise equalled 8 old annas) and 1-rupee coins were nickel. In 1964, the word "naya(e)" was removed from all coins. Between 1957 and 1967, aluminium one-, two-, three-, five- and ten-paise coins were introduced. In 1968 nickel-brass 20-paise coins were introduced, and replaced by aluminium coins in 1982. Between 1972 and 1975, cupro-nickel replaced nickel in the 25- and 50-paise and the 1-rupee coins; in 1982, cupro-nickel two-rupee coins were introduced. In 1988 stainless steel 10-, 25- and 50-paise coins were introduced, followed by 1- and 5-rupee coins in 1992. Five-rupee coins, made from brass, are being