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 independently 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 issue coins featuring the koala - one of the most famous and distinctive animals native to Australia; the reverse design change every year. The gold one-ounce coins have a face value of 100 dollars, but this is only symbolic - as the bullion value of their precious metal content is much higher. The overall weight is slightly more than one ounce, so that the pure gold content is exactly 1.000 AGW (one troy ounce Absolute Gold Weight).
The Mint says about this coin:
"The Australian Koala Gold Coin Series is one of our most popular annual collectable issues and each year celebrates the much-loved marsupial with highly detailed original artisanship. These 1oz high relief coins are struck from 99.99% pure gold in proof quality.
In 2018 our Koala release depicts one of Australia’s most recognised and best loved animals sitting on a branch of a eucalyptus tree, with gum leaves and flowers in the background. The depth and detail of the design has been enhanced by its high relief finish. The Perth Mint’s proof quality high relief strike is renowned throughout the world for its superb clarity and the additional detail it portrays." | 
Search for Australia: Gold Ounce 2018 Australian Koala on eBay 
