The Australian five ounces silver piece (abbreviated as 5 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 5oz silver proof high relief coin is part of the Australian Kookaburra coin range by the Perth Mint.
The Mint says about it:
With its much-loved call and striking blue, white and brown plumage, the kookaburra is an Australian icon. These kingfishers often make their "laughing" call at dawn and dusk while perched on tree branches, rooftops or fences to establish territory among family groups.
Celebrating the "king of the Australian bush", this impressive 5oz silver coin is enhanced by a high relief strike. | 
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