Designer: obverse: Arnold Machin; reverse: Stuart Devlin
Reference: KM# 64
Diameter: 19.4 mm
Reverse In the central part of the reverse is a relief image of an Australian echidna. On its tail, the numeral: 5. Below it, the letter 'SD' - the designer's mark of Stuart Devlin.
Obverse In the central part, the right-facing profile of Queen Elizabeth II of Great Britain. In the left part, along the edge of the coin, the English text: 'ELIZABETH II'. In the right part, along the edge of the coin, the country name in English and the year of issue: 'AUSTRALIA 1978'.