15 Dollars In the name of Elizabeth II, 6th Portrait - Koala - Gold Bullion

Australia's Koala gold bullion series has run continuously since 1980, with the reverse design changed annually — a deliberate policy that gives each year's issue a degree of collectibility beyond its melt value. The Perth Mint introduced the sixth portrait of Elizabeth II by sculptor Jody Clark in 2015, and it appeared on Australian bullion coinage through the final years of her reign. She died in September 2022, making 2023 issues the first year this portrait appeared posthumously before the transition to Charles III imagery.