10 Dollars - Charles III Friedrich Wilhelm II

A 0.31 g gold coin struck on a 45 mm planchet is an extremely thin wafer format — a production approach that has become commercially common among private minting houses supplying South Pacific sovereign issuers, where the legal tender framework requires a nominal denomination but the metal content is essentially incidental. The Solomon Islands has no meaningful connection to either Prussian king named in this issue's title, which conflates two distinct rulers across different centuries.