With the introduction of decimal currency on 14 February 1966, 24 new definitives were issued – the monarch was featured on the minor values (1c to 3c) and on the base domestic letter rate (4c) and the remainder featured Australian birds.
Silhouette photograph of the Queen taken by John Hedgecoe in London intended to be used for a new portrait stamp series, but the stamps were never issued. The approved design by a Note Printing Branch artist incorporated the Hedgecoe profile.