100 Dollars - Elizabeth II 4th Portrait - Australian Nugget - Gold Bullion Coin

The Australian Nugget series launched in 1986 under the Gold Corporation, with the Perth Mint adopting a rotating kangaroo reverse design annually from 1989 onward — a deliberate departure from the fixed-design approach used by rivals like the Krugerrand and Maple Leaf. The annual design change was a calculated marketing strategy to drive collector demand alongside pure bullion purchasing, effectively creating a secondary market for date-specific pieces.

The Ian Rank-Broadley fourth portrait of Elizabeth II was introduced across Australian coinage in 1999. KM#741 is specific to the 2004 date within that portrait run.