50 Dollars - Elizabeth II 4th Portrait - Kangaroo - Gold Bullion Coin

The Perth Mint's gold kangaroo series began life as the "Nugget" series in 1986, with designs depicting famous Australian gold nuggets rather than kangaroos. The switch to kangaroo reverses came in 1989, a deliberate move to compete more directly with the South African Krugerrand and Canadian Maple Leaf in the international bullion market. Perth's decision to change the reverse design annually — unlike its competitors — became a defining commercial strategy, creating a collector dimension within what is otherwise a pure bullion product.

The 4th portrait of Elizabeth II, by Ian Rank-Broadley, was introduced across Commonwealth coinage in 1998-99.