The dodecagonal type I fifty cent was issued to replace the round 1966 fifty cent from 1969 to 1984 with a number of patterns dated 1966 and 1967. It is struck on a dodecagonal planchet with the Arnold Machin portrait of HM Queen Elizabeth II on the obverse , and Stuart Devlin's interpretation of the Australian coat of arms on the reverse . Devlin's initials (SD) can be found on the bottom of the reverse underneath the denomination. The type was struck exclusively at the Royal Australian mint in Canberra.
