Non-decimal currency Non-decimal currency A non-decimal currency is a currency that has sub-units that are a non-decimal fraction of the main unit, i.e. the number of sub-units in a main unit is not a power of 10. Today only two countries in the world use non-decimal currencies. Both of these countries are in Africa. These are Mauritania (1 ouguiya = 5 khoums) and Madagascar (1 ariary = 5 iraimbilanja). However these are only theoretically non-decimal, as in both cases the value of the main unit is so low that the sub-unit is too small to be of any practical use and coins
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: