Australian pound became $1 and 1s became 10c. The conversion rate was problematic for the pre-decimal penny since the shilling was divided into twelve pence. An exchange rate of $2.40:£1 would have allowed for accurate conversion down to the penny, with one penny becoming one cent; however, the Government thought it more important that the new currency unit be more valuable than the United States dollar which it would not have been under a 2.4:1 ratio. Amounts less than a shilling were converted as follows: In 1855, gold full and half sovereigns (worth respectively one pound sterling and ten shillings) were first
Guernsey pound than the modern version and the diameter also measured slightly less. The 1-pound coin ceased to be legal tender on 15 October 2017 to coincide with the withdrawal of the circular £1 coin in the UK. The UK's new twelve-sided £1 coin will be the only £1 coin that is legal tender on the island. The first decimal issues continued with the same obverse as the last pre-decimal issues until 1985, when Raphael Maklouf's portrait of Queen Elizabeth II was added. Ian Rank-Broadley's portrait of the Queen has appeared since 1998. Designs on the reverses of Guernsey's decimal coins are: