The penny series was first issued in 1911 at the beginning of Australia coinage. During its period of circulation three monarchs were featured on the obverse - George V (1911 - 1936), George VI (1937 - 1952), and Elizabeth II (1953 - 1964). Two reverse designs were utilised, the first was by W.H.J Blackmore and was entirely text based. This design was used until 1937 when it was changed to Kruger Gray's iconic bounding kangaroo obverse. The half penny series concluded in 1964 when decimal currency was introduced in Australia.