Common, scarce and rare Australia currency (paper money; bank notes [also, banknotes]) at Mintmark.com.
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"The Australian dollar (sign: $; code: AUD) is the currency of the Commonwealth of Australia, including Christmas Island, Cocos (Keeling) Islands, and Norfolk Island, as well as the independent Pacific Island states of Kiribati, Nauru and Tuvalu. Within Australia it is almost always abbreviated with the dollar sign ($), with A$ or AU$ sometimes used informally to distinguish it from other dollar-denominated currencies. It is subdivided into 100 cents. The Australian dollar is currently the sixth-most-traded currency in the world foreign exchange markets, (behind the US dollar, the euro, the yen, the pound sterling, and the swiss franc), accounting for over 6% of worldwide foreign-exchange transactions . . . The Australian dollar is not a true dollar in the sense that it is descended directly from the Spanish pieces of eight, as is the case with the US dollar, the Canadian dollar, and the East Caribbean Dollar.
The Australian dollar is essentially a half pound sterling. Australia followed the pattern of South Africa in that when it adopted the decimal system, it decided to use the half pound unit as opposed to the pound unit of account. The choice of the name dollar was motivated by the fact that the reduced value of the new unit corresponded more closely to the value of the US dollar than it did to the pound sterling . . ." — Australian dollar at Wikipedia