5 Dollars - Elizabeth II 6th Portrait - Great Barrier Reef, Domed

The Royal Australian Mint's domed coinage program has pushed technical boundaries since its first curved-planchet issues in the mid-2010s, requiring custom striking equipment and specialized die geometry to achieve consistent relief across a concave and convex surface simultaneously. The Great Barrier Reef subject carries particular urgency given that large-scale coral bleaching events — most severely in 2016, 2017, and 2022, the very year of this strike — have affected over half the reef system.

Ian Rank-Broadley's fifth portrait was replaced for Australian coinage by Jody Clark's sixth portrait in 2019.