BRITISH, Windsor. Elizabeth II, 1952-2022. Pattern 100 Pounds 2022 (Platinum, 33 mm, 31.21 g, 12 h), on her 50th Anniversary of Reign. Trial of the Pyx Test Piece, Llantrisant. ELIZABETH II•D•G•REG•F•D •100 POUNDS // •HONI•SOIT•QUI•MAL•Y•PENSE• Crowned Elizabeth II on horseback to left, surrounded by the Order of the Garter, •20-22• below. Rev. •1952-2022• Crowned coat of arms. KM 2271. Extremely rare, mintage of only 180 pieces. In NGC encapsulation, graduated Brilliant Proof. Proof. From the Dr. Chris Liassides Collection of World Coins and from a collection of Historic Test Pieces from the 2023 Trial of the Pyx, presented on helped of The Royal Mint, Stack's Bowers 2023 trial of the pyx auction, 13 February 2024, 1193. This lot can be shipped to a US address.