25 Dollars - Charles III Petra

Cook Islands has issued commemorative silver under its own authority since 1972, despite having no independent monetary system — New Zealand dollars circulate in practice, and these pieces are struck purely for the collector market. The Petra series, produced for the Cook Islands by external minting houses, sits in a crowded field of large-format silver issues bearing Charles III's effigy following his accession in September 2022.

At 155.5 g, this is a 5 oz piece — a format that became increasingly common after spot silver climbed sharply through the early 2020s, as issuers sought higher face-value justifications for premium-priced product.