What replaced the ten shilling coin when the United Kingdom and the Republic of Ireland decimalised their currencies?
Fifty pence (Irish coin): The fifty pence (50p) (Irish: "caoga pingin" ) coin was a subdivision of the Irish pound. Fifty pence (Irish coin):  It replaced the ten shilling coin when decimalised, and due to this conversion was introduced a year before Decimal Day in 1971. Decimal Day: On 15 February 1971, known as Decimal Day, the United Kingdom and the Republic of Ireland decimalised their currencies.
fifty pence