6 Pence - Elizabeth II (1st Portrait; without "F:D:")

The 1953 Australian sixpence holds a unique place in numismatic history due to a significant oversight during its initial production. Struck following the coronation of Queen Elizabeth II, the obverse design by Mary Gillick featured the monarch’s portrait accompanied by the traditional Latin titling. However, the engravers at the Royal Mint inadvertently omitted the letters 'F:D:', which stand for 'Fidei Defensor' or 'Defender of the Faith', a title traditionally associated with the British monarch.

This omission became a point of concern within the Australian government and religious groups, leading to the rapid recall of the coins and the subsequent issuance of a corrected version later that year. The Mary Gillick portrait itself was lauded at the time for its youthful and optimistic depiction of the new Queen, replacing the stern aesthetic of previous coinage. Today, the 1953 'missing F:D:' sixpence is a sought-after rarity for collectors of Commonwealth currency, serving as a physical reminder of the transition between the reigns of King George VI and Queen Elizabeth II.