25 Dollars - Elizabeth II Benjamin Franklin

This piece is part of a broader collector series rather than a circulating issue — Cook Islands has long used its constitutional relationship with New Zealand to issue legal tender coins that are sold exclusively into the numismatic market, a revenue stream the islands have exploited aggressively since the 1970s. Franklin himself would have appreciated the arrangement: he understood better than most that money's value is as much a matter of convention as of metal.

At 155.5 g, this is a five-troy-ounce strike — a now-standard bullion increment that became the dominant format for high-denomination collector silver issues in the 2010s.