2006 Uncirculated 8 Coin Set, 40 Years of Decimal Currency. 'C' day on 14 February 1966 marked a special day in Australia's history when the nation's currency officially converted to the dollars and cents system. The Royal Australian Mint's 2006 Unciruclated Coin Set commemorates the 40th anniversary of Australia's change to decimal currency. Included in this special coin set are Australia's 1 and 2 cents coins.not seen since 1991. Denominations included in this set are $2, $1, 50 cent, 20 cent, 10 cent, 5 cent, two cent and one cent. *Please note there are some faint scuff marks on both sides of outer packaging. Please contact Adelaide Exchange Jewellers to find out more on this item.