The threepence series was first issued in 1910 at the beginning of Australian coinage. During its period of circulation four monarchs were featured on the obverse - Edward VII (1910), George V (1911 - 1936), George VI (1937 - 52), and Elizabeth II (1953 - 1964). Two reverse designs were utilised, the first was W.H.J. Blackmore's interpretation of the Australian Coat of Arms. This first design was used until 1937 when it was changed to Kruger Gray's wheat stalk obverse. The threepence series concluded in 1964 when decimal currency was introduced in Australia.