History of the threepence the possible advent of a decimal currency at the time (see florin), when the 3d at 1/80th of a pound would not have fitted within a decimal system). Currency silver threepences from 1838 to 1926 were of identical design and cannot usually be distinguished except in the best conditions when the higher striking standard of the maundy coins stand out; this resulted in the curious legal anomaly that when the currency was decimalised in 1971 "all" silver threepences from 1870 onwards were revalued at three new pence, not just the maundy coins. Threepences were produced with both the "young head"
Penny (Irish pre-decimal coin) Penny (Irish pre-decimal coin) The penny (1d) () coin was the third smallest denomination of the pre-decimal Irish pound, worth of a pound or of a shilling. To express an amount, penny was abbreviated to "d", e.g. 1d, from the Roman "denarius". It was introduced in 1928 to replace its British counterpart, used when all of Ireland was a constituent country of the United Kingdom. The last year of minting was 1968 and it ceased to be legal tender on 31 December 1971. The coin measured in diameter and weighed 9.45 grams. The bronze coin was made up of 95.5%