In 1966, Australia farewelled pounds, shillings and pence in favour of the much simpler decimal system. It was a landmark moment! In 2016, the Royal Australian Mint honoured the 50^th anniversary of this moment with the superb Decimal Currency 50^th Anniversary 2016 20c Cu-Ni Coin. This Australian legal tender issue is a unique, one-year-only type - and is essential for a complete decimal collection.