The Australian one ounce silver piece (abbreviated as 1 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.
The Australian Silver Kangaroo coin range was introduced in 1993 by the Royal Australian Mint; subsequently, the Perth Mint also started issuing Kangaroo bullion coins. The coins have legal tender status in Australia and are one of few legal tender bullion silver coins to change their design every year. This and their limited annual mintage may, unlike for many other bullion coins, raise their numismatic value over the value of silver used. | 
