25 Dollars - Elizabeth II Spitfire

The Supermarine Spitfire's development was funded in part by public donation campaigns during the war — individual towns, companies, and even foreign governments paid roughly £5,000 per aircraft, receiving a nameplate in return. The Solomon Islands' connection to the broader Pacific theatre gives this commemorative an oblique historical logic, though the Spitfire itself never operated in that region, being primarily a European and North African machine.