Designer: obverse: Raphael David Maklouf; reverse: Stuart Devlin
Reference: KM# 82
Diameter: 28.5 mm
Reverse A platypus and the numeral 20 are depicted against a background of water ripples. To the left of the aquatic mammal are the initials of the designer Stuart Devlin - 'SD'.
Obverse In the central part is a right-facing profile of Queen Elizabeth II of Great Britain wearing a crown. On the left, following the curve of the coin's edge, is the monarch's name 'ELIZABETH II'. On the right are the country name 'AUSTRALIA' and the year of minting '1985'. In the truncation of the neck are the initials of the British sculptor Raphael David Maklouf - 'RDM'.