Alderney
British Dependency. Elizabeth II gold Proof "Prince William's 21st Birthday" 5 Pounds 2005 PR69 Ultra Cameo NGC, KM113b. Incorrectly listed in the Standard Catalog of World Coins as celebrating Prince William's 21st birthday when it was in fact issued for Prince Henry. AGW 1.1771 oz.
From the George Hans Cook Collection
https://coins.ha.com/itm/alderney/alderney-british-dependency-elizabeth-ii-gold-proof-prince-william-s-21st-birthday-5-pounds-2005-pr69-ultra-cameo/a/3076-31006.s?type=CoinArchives3076
HID02906262019
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Estimate: 1500-2000 USD