100 Dollars - Charles III 1st Portrait - Australian Koala - Gold Proof High Relief

The Australian Koala gold series has been running since 1986, but the shift to high-relief striking represents a meaningful technical departure — high-relief dies require slower, multi-strike pressing and wear out far faster than standard production dies, which keeps annual mintages tightly constrained. This is also the first year the series carries the Ian Rank-Broadley replacement portrait of Charles III by Jody Clark, following the Queen's death in September 2022.