The one pound (£1) (Irish: punt) coin was a coin of the Irish pound. It was used in Ireland from 20 June 1990 until Ireland joined the euro in 2002. The last issue was in 2000.
The coin was almost identical in dimensions to the old penny coin that circulated until 1971, and was similar in diameter to, but thinner than, the half-crown coin. Unlike some previous Irish coins, it was very different from its British equivalent, as the Irish pound separated from the British pound in 1979.
During the early circulation of the coin, many payphones and vending machines which had been changed to accept the £1 coin also accepted the old penny, which was no longer legal tender and of little value to collectors. As a result, vending machine operators lost money, and they incurred further costs to alter the machines so as not to accept the pennies. Further, coins dated 1999 (produced by the Royal Mint of the United Kingdom and not the Central Bank of Ireland) were rejected by many vending machines (including parking meters in Dublin) as they were lighter than the standard coins, having been produced from a different alloy.