10 Dollars - Elizabeth II Posthumous, First Gold Rush in History

The "first gold rush in history" designation here points to the California Rush of 1848 — though numismatists and historians would reasonably contest that framing, given documented gold rushes in Brazil's Minas Gerais region nearly a century earlier. The 45mm diameter against a 0.31g gold weight tells you this is a large-format, wafer-thin piece engineered for visual presentation rather than bullion value, a format that has proliferated sharply in commemorative issues since the mid-2010s.

Solomon Islands has functioned primarily as a licensing issuer for decades, with pieces like this produced and marketed entirely outside the issuing territory by European minting houses.