Post 1929 - After the Depression, inflation and deflation led to currencies being devalued. Australia changed its currency from Pound Sterling to Australian Pound.
In 1953 following the coronation of Her Majesty Queen Elizabeth II new banknotes were issued with portraits depicting important Australian figures including Her Majesty on £20 note, , and on £50 note which was never circulated!
In 1965 Prime Minister Robert Menzies coined the Australian banknotes "the Royals" and trial runs were printed, this name proved so unpopular though that they were shelved and the name "dollar" was adopted in its place.
1966 saw the introduction of the Australian Dollar banknotes which had exact equivalents in the old pound notes: 1 dollar = 10 shillings, 2 dollars = 1 pound.
Then in 1988 Australia issued its first polymer note. Enjoy!