2026 The Great Engravers 'William IV Crown' 2oz Gold Proof Coin

Developed as the centrepiece of The Great British Treasure Hunt, this coin forms part of a unique collectible experience combining numismatics with puzzle-solving and discovery. Designed as both a collector’s piece and an interactive challenge, it gives owners the opportunity to take part in a nationwide treasure hunt.

The design is inspired by the legacy of Sir Isaac Newton, reflecting his long association with the Royal Mint and his lasting contribution to science and innovation.