The coins officially measured 0.796875 inches (20.2406 mm) in diameter and weighed 2.83495 grams.

It was introduced in 1928 to replace the British farthing and ceased to be legal tender on 1 August 1969.

The reverse design featuring a woodcock was by English artist Percy Metcalfe.

From 1928 through 1937 the date was split either side of the harp with the name Saorstát Éireann circling around.

Ireland is one of only four nations (including Britain, South Africa, and Jamaica) to issue farthing coins in the 20th century.