The Australian one-ounce gold piece (abbreviated as 1 oz and designated with Au for "gold") is a bullion coin format. Uniquely, in Australia there are two mints authorised to strike legal tender: the Royal Australian Mint (which also makes the country's circulating coinage) and the Perth Mint which only makes collector and bullion coins, as well as other bullion products.
Both mints endeavour to create coins with attractive designs, and to introduce new designs and themes often, in order to raise the numismatic value of the coins over the value of previous metal used.
This one-ounce gold coin with a face value of $100 is part of the Perth Mint's Australian Emu bullion coin range which features a new reverse design every year.
The Mint says about it:
This remarkable gold coin champions the emu, known for its extraordinary size and speed. As the second largest bird in the world and the largest in Australia, the emu stands up to 1.9 metres tall and can run as fast as 50 kilometres per hour. Found across Australia in open plains, snowfields, forests and savanna woodlands, the birds nest in winter and remain in pairs for about five months until eggs are laid, after which the male incubates alone for 55 days. | 
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