The Australian half ounce silver piece (abbreviated as 1/2 oz and designated with Ag for "silver") is a bullion and commemorative 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 coin marks the 90th Anniversary of the Australian Broadcasting Corporation (ABC) (named Australian Broadcasting Commission before 1983).
The mint says about it:
For nine decades, the ABC - Australia’s national broadcaster, has told the Australian story through a myriad of platforms and media. From its beginnings in radio, through to the introduction of television and the rise of digital media, "Aunty" (the service's nickname) has always been there to inform, educate and entertain us. | 
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