100 Dollars - Elizabeth II Silver Star

Cook Islands has served as a prolific vehicle for novelty bullion issues since the 1990s, with its monetary authority licensing designs to a rotating cast of European minting houses — primarily the Austrian Mint and various Polish and German private mints. The "Silver Star" series falls squarely in this category: a collector-market product issued under Cook Islands authority but with no meaningful circulation function or domestic monetary history.

At a kilogram of .999 silver, the technical execution is the story here. The 100mm diameter places it in a crowded field of kilo rounds produced throughout the 2010s as silver spot prices made large-format bullion commercially viable for the collector market.