G086 Unique "Trial Piece" "Rosalind Franklin" 2020 Great Britain

G086 Unique "Trial Piece" "Rosalind Franklin" 2020 Great Britain gold proof trial coin 50 Pence (0.45 oz), NGC Proof 70 Ultra Cameo. A highly unusual and unique "Trial Piece" as denoted by the stamp to the left of Elizabeth's bust impressed "Royal Mint Trial" as well as the COA stating such with a maximum mintage of 1 piece. This coin was Struck to celebrate the centenary of birth of Rosalind Franklin, the scientist accredited for "Photograph 51" which demonstrated the double helix structure of DNA. According to the Royal Mint, a trial piece is one of the first samples struck using a new die, and is carefully inspected by coin makers at the Royal Mint to ensure it meets their exacting standards. The trial pieces are then stored for posterity and the design is officially approved by the Queen before coin striking can begin. To ensure authenticity, each die trial piece bears a hallmark stating the quality of the metal and a unique latent security feature – designed by The Royal Mint’s chief engraver, Gordon Summers. US shipping is free. International shipping is 100 FedEx or UPS.