2015 50th Anniversary of the Royal Australian Mint Fifty Cent Coloured Uncirculated Coin. The Royal Australian Mint has been producing coins for the last 50 years, which people across Australia have spent, saved and collected. Since 1969, Australia's 50 cent coin has been a unique dodecagon shape. This design features many of these shapes arranged into a honeycomb, a tribute to the Royal Australian Mint employees who are 'as busy as bees' making Australia's coins. Mintage 30,000.