Koala, 1 ounce (Perth Mint)
Since it was first issued in 2007, the Australian Koala 1 ounce has been one of the most popular silver coins in the world. It was originally planned as a limited series of silver coins, with the design of the koala on the reverse side changing every year—which makes it an even more sought after item on the investment silver market.
The Perth Mint is the official gold and silver coin mint of Australia. It is owned by the State of Western Australia. The mint started operating in 1899, two years before to the Australian continent became a federation. The Perth Mint is also known for gold coins of very unusual weight such as the 1kg Australian Kangaroo. It is no surprise then that in 2011 this mint produced the largest gold coin in the world–80cm in diameter, 12cm wide, and weighing 1012kg. This gold coin weighing more than a ton is made of pure gold and its value at the moment of minting was 53 million Australian dollars.