25 Dollars - Charles III SilverNote Coinbar

The "coinbar" format — a rectangular silver bar with an embedded legal-tender coin — has been aggressively marketed by a handful of private mints working under licensing agreements with Niue, whose government lends its issuing authority to products with essentially no domestic circulation. Niue's population hovers around 1,500 people. The 311g fine silver content aligns precisely with a 10 troy ounce specification, the standard bullion increment driving the format's commercial logic.