25 Dollars - Charles III Machu Picchu

Cook Islands has long served as an issuing authority for third-party bullion and commemorative programs with no direct connection to the subject matter — Machu Picchu is a Peruvian archaeological site, and Peru has its own mint. The arrangement is straightforwardly commercial: Cook Islands licensing provides a legal tender face value and royal portrait for coins designed, marketed, and distributed entirely outside the Pacific.

At 155.5 g, this is a five-troy-ounce piece — a format that became increasingly common in the premium bullion market after 2010 as mints competed on size and relief depth rather than numismatic scarcity.