The Type I round fifty cent is a unique issue in the sense that it is the only circulation decimal coin struck with a silver content. The silver content was significantly above face value and consequently the issue was discontinued after 1966 citing that it was too easily confused with the twenty cent coin. The fifty cent was later revised in 1969 as a dodecagonal coin. It features the coat of arms on the
and her majesty, Queen Elizabeth II on the
The issue was struck at the Royal Australian mint though a number of
are known to be struck at the Royal mint London.