2023 Britannia Silver Proof 2 oz UK Coin With OGP Box & COA – Only 1000 Minted! Just 1,000 Britannia silver coins available in this Limited Edition Presentation. Struck in two ounces of 999 fine silver to Proof standard. The first commemorative Proof Britannia coin to feature the portrait of His Majesty King Charles III. Artist Jonathan Olliffe’s design features seahorses, inspired by royal carriages used during processions. Find out what inspired this year’s maritime-themed design in the accompanying booklet. Weight: 2 oz (62.86 g). Reverse Designer: Jonathan Olliffe. Obverse Designer: Martin Jennings. Packaging: OGP Box with COA.