The Australian gold half gram coin is a mini-coin format occasionally used to complement issues in larger sizes. 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 have long-running bullion series of coins with different themes. As part of these, they sometimes issue a mini-version of the theme's annual design.
The Mint says about this coin:
The cute Mini Koala coin will make a beautiful gift or collectable. Showcasing the new 2014 koala design, the new Mini Koala coin’s reverse portrays a close-up portrait of a koala, with The Perth Mint’s historic ‘P’ mintmark also included in the design. Issued as legal tender under the Australian Currency Act 1965, the Ian Rank-Broadley effigy of Her Majesty Queen Elizabeth II, the 2014 year-date, and the monetary denomination, are shown on the coin’s obverse. | 
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