The sixpence (6d; or ) coin was a subdivision of the pre-decimal Irish pound, worth of a pound or of a shilling. The Irish name is derived from the Spanish ; for most of the 19th century, a pound sterling was equal to five U.S. dollars, and a dollar was equal to eight , so that a was equal to of a pound. The variant spelling was used in the Coinage Act 1926, and appeared on the coins themselves even after a 1947 spelling reform established as the standard. The coin was originally struck in nickel, like the threepence coin, and was very well wearing. The metal was changed to cupronickel in 1942 as nickel increased in value; this coin, which consisted of 75% copper and 25% nickel, was not as well-wearing. The coin measured in diameter and a weighed 4.53593 grams. Five early coins were minted featuring a design by Publio Morbiducci, which depict the Wolfhound's head looking back; these coins are quite valuable, estimated at several thousand euro – they remain in the hands of collectors and were never released to circulation. The general design of the coin was by English artist Percy Metcalfe. His designs had been selected by a panel from those submitted by a number of sculptors who had been invited to create designs for the coinage of the new Irish Free State. The brief for the design of the sixpence was that it feature an Irish Wolfhound. The obverse featured the Irish harp. From 1928 to 1937 the date was split either side of the harp with the name Saorstát Éireann circling around. From 1938 to 1969 the inscription changed to Éire on the left of the harp and the date on the right. It has been suggested by some that the dog depicted is Master McGrath, a famous coursing greyhound raised in County Waterford. Although the frieze of Master McGrath on the Master McGrath monument in Waterford, the only public monument in Ireland to a greyhound, does bear some similarity to Metcalfe's design, there is no evidence to suggest that the animal on the coin is anything other than a wolfhound, as greyhounds are not native to Ireland. It was expected that this coin would circulate alongside the new decimal coins, with a value of new pence as in the United Kingdom. With this in mind the Central Bank of Ireland continued to