500 Dollars - Charles III 1st Portrait - Australian Kangaroo - Gold Proof

The 155.533g specification is not arbitrary — it is exactly five troy ounces, placing this coin in the uppermost tier of Perth Mint's bullion proof program. Charles III's first portrait on Australian coinage was executed by sculptor Jody Clark, whose effigy was adopted across Commonwealth mints beginning in 2023 following the accession.

Perth's .9999 four-nines gold standard exceeds the .9167 historic sovereign fineness by a meaningful margin, a refinement the mint has maintained since the mid-1980s when it repositioned itself as a premium bullion producer to compete directly with Maple Leaf coinage from the Royal Canadian Mint.