Obverse
4th portrait of Queen Elizabeth II facing right wearing the Girls of Great Britain and Ireland Tiara
Script: Latin
Lettering:
ELIZABETH II
AUSTRALIA 2004
IRB
Designer: Ian Rank-Broadley Read more on Wikipedia
Reverse
Australia coat of arms (the escutcheon is carried by a red kangaroo (Macropus rufus) and an Emu (Dromaius novaehollandiae)) and the numeral “50”
Script: Latin
Lettering:
50
SD
Designer: Stuart Devlin Read more on Wikipedia
Edge
12-sided, smooth