Sovereigns and Half-Sovereigns minted in Australia at the Melbourne, Perth and Sydney Mints, were in fact British Coins and were struck to the same dimensions, specifications and design as the coins would have been had they been minted at the Royal Mint in London.
The exception to this is the Sovereigns and Half-Sovereigns minted at the Sydney Mint between 1855 and 1870 which had "Sydney Mint" and "Australia" inscribed on the reverse, which were for the use of the Colonies.
Since 1816, all Half-Sovereigns were 0.917 fine gold, weighed 3.994 grams (half of the weight of a Sovereign) and 19mm in diameter.
Australian Party ended in 1931.
Australian Institute of Anatomy was created in 1931.
South Australian Register ended in 1931.
Geoff Davis - Australian politician - was born in 1931.
James Stewart - Australian politician - died on 1931-12-20.
John Brown - Australian politician - was born on 1931-12-19.
Neil Davies - Australian footballer - was born on 1931-12-09.
Peter Drummond - Australian politician - was born on 1931-08-21.
Roger Duffy - Australian rules footballer - was born on 1931-09-26.
William Harris - Australian civil rights leader - died in 1931.
Australian coins minted for general circulation in 1931 were -Halfpenny - 369,000Penny - 494,000Threepence - not mintedSixpence - not mintedShilling - 1,000,000Florin (Two Shillings) - 3,129,000The Threepence, Sixpence, Shilling and Florin were all made from 92.5% silver in those days.
Cadbury New Zealand (1931): (see related link)