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.
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.