75 Dollars - Elizabeth II 6th Portrait - Adelaide Pound - Bi-Metal Coin

The Adelaide Pound of 1852 was Australia's first gold coin struck on home soil — produced at a private assay office in South Australia when the colonial government, overwhelmed by goldfield output from the Ballarat and Bendigo rushes, couldn't wait for official sanction from London. The Colonial Office never actually authorized it, making the original a legally dubious emergency issue that nonetheless circulated freely. This 2020 Perth Mint recreation pairs gold and silver in a single piece, a format the original Adelaide assayers never had the technology or mandate to attempt.