 All coins portray the reigning Australian Sovereign, Queen Elizabeth II, on the obverse, and are produced by the Royal Australian Mint.Australia has regularly issued commemorative 50-cent coins.The first was in 1970, commemorating James Cook's exploration along the east coast of the Australian continent, followed in 1977 by a coin for Queen Elizabeth II's Silver Jubilee, the wedding of Charles, Prince of Wales and Lady Diana Spencer in 1981, the Brisbane Commonwealth Games in 1982, and the Australian Bicentenary in 1988.