1/2 Crown - Charles III Battle of Britain, Gold plated

Gibraltar has issued commemorative crowns under its own authority since 1967, a right preserved through its constitutional relationship with the Crown despite having no independent monetary policy. The Battle of Britain connection is well-trodden numismatic territory — dozens of issuers have worked that subject across sixty-plus years of commemorative coinage.

Gold-plated copper-nickel at .9999 surface purity is a marketing specification, not a metallurgical one. The plating layer is typically measured in microns.