The Britannia 2023 UK 1oz Silver Proof Coin. Limited Edition – ONLY 3450 Minted — Coin No. The Britannia coin for 2023, struck in one ounce of 999 fine silver to Proof standard. Just 3,450 of these coins are available in this Limited Edition Presentation. 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. Comes with a booklet on the historic coins and medals that inspired this year’s bold design.