100 Dollars - Elizabeth II 4th Portrait - Bottlenose Dolphin - Gold Bullion Coin

The Perth Mint's four-nines gold bullion series occupies a specific niche in the Australian market — legal tender face values set absurdly below spot price, a technicality that confers tax treatment advantages under Australian law rather than any practical monetary function. The Bottlenose Dolphin issues from this period were part of a rotating wildlife bullion program designed to sustain collector demand alongside the Mint's flagship Kangaroo series, competing directly with the Royal Canadian Mint's similar diversification strategy through the 2010s.

Ian Rank-Broadley's fourth portrait of Elizabeth II, used here, was already being phased toward replacement by Jody Clark's effigy on many Commonwealth issues by 2019.