King George V (1911–1936)

George V became King of the United Kingdom in 1910 after the death of King Edward VII. Subsequently, coins minted for Australia by the Royal Mint, London, dated 1911, were altered on the obverse only. Bronze halfpennies (and pennies) were issued for the first time this year.^[6]

Australian halfpennies depicting George V feature him robed and crowned on the obverse, facing to the left and from bust up. The effigy of George V used is known to "grace the vast majority of Australia’s rarest and most desirable Commonwealth coins."^[1]

The reverse during this time consisted of the words "ONE HALF PENNY" in three lines at the centre, surrounded by a beaded circle. A small scroll is located under the word "PENNY" within the beaded circle, and the legend "COMMONWEALTH OF AUSTRALIA" with the issued date surrounding the circle of beads.^[7] Depending on the place of mintage, certain coins could also contain a small mintmark located under the scroll.

In 1916, during minting of Australian halfpennies in Kolkata, an extremely rare error coin was produced in which a coin blank with a halfpenny reverse and an Indian quarter anna obverse was struck. The error came to light in 1965, and around 7 to 9 are known to exist.

In 1936, Edward VIII was crowned as king from 20 January, until he abdicated that same year, on 11 December. However, during this year, all Australian coins continued to bear the bust of George V.^[5]

King George VI (1938–1952)

On 11 December 1936, George VI came to the throne on the abdication of Edward VIII.^[6]

In the first few years of his reign, the halfpenny continued to use the "Commonwealth of Australia" design. However, In 1939, there were two different types of the reverse struck—one of the previous "Commonwealth of Australia" design reverse, and the other with a new Kangaroo reverse, which had started appearing on the reverse of pennies a few years prior.^[5] 1939 halfpennies with the Kangaroo reverse are considerably rarer than the "Commonwealth of Australia" reverse.

Throughout George VI's reign, different years of halfpennies were struck in different places. In 1942 and 1943, Australian halfpennies were struck in Melbourne and Bombay.^[5][6] From 1944 to 1951, the Melbourne and Perth Mints were charged with striking halfpennies. In 1951, the Royal Mint in London struck halfpennies with the mintmark "PL" used to signify this.^[5][6] In 1952, halfpennies were solely struck by the Perth mint, with a dot after the word "Australia" to symbolise this.^[6]

Queen Elizabeth II (1953–1964)

From 1953 to 1964, the Perth Mint struck all of Australia's halfpennies, excluding 1959 (when they were struck by the Melbourne Mint). In 1953, the Perth Mint situated a mintmark dot after "Australia", whereas from 1960 to 1964, they placed the dot after the word "halfpenny".^[5]

1916I Mule ~ valued up to AUD $100,000 – $125,000 ^[7]

1916I Mule Halfpenny (Obverse 2; Reverse A). NGC graded AU Details BN

The 1916I Mule carries the standard Australian reverse for halfpennies of 1916, however, it is distinguishable by its obverse, which is that of an Indian quarter anna coin. It is Australia's rarest Commonwealth coin issued for circulation, and when its significance was first recognised in the Australian numismatic press in the mid 1960s, it was described as the "biggest find in coin history, and one of the most valuable."^[5] There are currently 5 known specimens in existence,^[2] and it is predicted that there are 6–10 examples in existence.^[7]

The historical context of how the Indian Quarter Anna obverse came onto 1916 Halfpenny, is that during World War I the Royal Mint of London assigned the production of a range of Australian coins to the Calcutta Mint, with the reason for this change being that there were allay concerns that the German Navy could have the ability to intercept or sink maritime deliveries of coinage from Britain to Australia.^[5] This would not have only had the consequence of expense, but would have also been morale-shattering in a time of great need. The 1916 Australian halfpenny and penny were the first non-Indian coins to be produced by the Royal Mint's Calcutta branch.^[5]

It is to be noted that the Calcutta Mint had been successfully producing copper Annas and silver Rupees since 1862, so the mint had the resources, systems and experience to produce this new coin. It is still subject to debate how the error of the 1916I Mule Halfpenny came into existence.

This coin, like any numismatic item, is sought after by collectors for a variety of reasons. It appeals to collectors for its rarity, being a crucial component in creating a truly complete Australian Commonwealth coin set, its historical numismatic significance, and being topic of continued debate.

1923 ~ valued up to AUD $75,000 – $100,000 ^[7][9]

1923 Halfpenny (Obverse 1; Reverse A). NGC graded MS 62 BN.

In 1922, the Royal Mint’s Sydney Branch manufactured sixpence and halfpenny coins for the Commonwealth. These coins were produced using dies supplied from the Melbourne Mint. In 1923, the future of the Sydney Mint was uncertain (eventually closing in 1926) which led to 1923 dies not being sent to Sydney, leaving the entire issues from Sydney for that year—some 1,113,600 coins—being struck baring the incorrect date of 1922. This meant that in July 1923, the Melbourne Mint received an order to produce £1000 of halfpenny coins (equating to 480,000 coins).

Three pairs of 1923 dies were issued from the Melbourne workshop in September of that year. However, all three of these dies failed in early stages—one was immediately returned to the workshop for amendments, and the remaining two cracked early in production. This resulted in the rarity of 1923 halfpenny coins.^[6][7] 1923 halfpennies can now fetch up to several thousand dollars.

1939 ~ valued up to AUD $25,000 – $35,000

1939 "Roo" Halfpenny. (Obverse 3; Reverse B). NGC graded MS 65 BN

Source:^[7]

In 1939, the first halfpenny coins continued to be produced with the long-standing  "•COMMONWEALTH OF AUSTRALIA•" which had held since their first introduction 1911.  However, later that year the reverse changed to a scaled-down and horizontally inverted version of the penny Kangaroo reverse, which was introduced the previous year in 1938. Furthermore, there were two observably distinct reverse Kangaroo dies on the (then) new 1939 halfpennies—one from the original London die master and the second from the Melbourne Mint.^[1][5]

There are a number of features on the 1939 Kangaroo reverse coins that allow the two types to be distinguished. The most notable difference in marking is observable when comparing the foot of the "Y" in "HALFPENNY"—the rarer of which presents a double foot, while the more common version displays a single foot. The Australian Numismatic Dealers Association regards the double foot 1939 halfpenny as an "extremely rare coin in uncirculated condition."^[7]