50 Pence - Charles III The Winged Keys, Gold Proof

The Winged Keys design belongs to a Royal Mint series celebrating the history and iconography of the Tower of London, issued across multiple years and formats. At 8 mm and 0.8 g of .9999 gold, this is among the smallest gold proof coins the Royal Mint produces — a quarter-sovereign-adjacent format that has grown considerably in collector appetite since its introduction, largely because the low gold content keeps acquisition costs accessible without sacrificing the proof finish.