Great Britain
Elizabeth II gold Proof Britannia "World War I 100th Anniversary" 10 Pounds (5 oz) 2014 PR70 Ultra Cameo NGC, S-4643. One of First 10 Struck. Struck from a miniscule mintage of just 26 pieces. An absolutely pristine representative of this large gold emission, with jet-black mirrors reflecting a frosted Britannia and lion looking out over the English Channel.
https://coins.ha.com/itm/great-britain/great-britain-elizabeth-ii-gold-proof-britannia-world-war-i-100th-anniversary-10-pounds-5-oz-2014-pr70-ultra-came/a/3091-32591.s?type=CoinArchives3091
HID02906262019
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Estimate: 8000-12000 USD