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| 正面描述 | Fifth definitive effigy of Queen Elizabeth II facing right, wearing the George IV State Diadem adorned with pearls, diamonds, and floral emblems, with a drop earring visible at the ear. The portrait, engraved by Jody Clark, is rendered in high relief against a deeply mirrored proof field. The peripheral legend reads ELIZABETH II · D · G · REG · F · D · 50 PENCE · 2020, disposed around the full circumference of the heptagonal flan, with the engraver's initials J.C. incuse below the truncation. |
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| 正面铭文 | ELIZABETH II·D·G·REG·F·D·50 PENCE·2020· J.C (Translation: Elizabeth the Second by the Grace of God Queen Defender of the Faith) |
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| 附加信息 |
Part of the Royal Mint's three-coin Dinosaur series, the Hylaeosaurus holds a specific distinction within paleontological history: it was one of the three genera — alongside Megalosaurus and Iguanodon — that Richard Owen used in 1842 to define the entirely new taxonomic grouping Dinosauria. Owen announced the concept at the British Association for the Advancement of Science meeting in Plymouth, drawing on specimens already held by the Natural History Museum. The animal itself was first described by Gideon Mantell in 1833 from fragmentary Sussex Wealden remains, most of which are still embedded in the original matrix block and have never been fully extracted.