1000 Pounds - Elizabeth II Royal Wedding

Issued to mark the April 2011 marriage of Prince William and Catherine Middleton, this is one of the largest commemorative coins ever produced under a British crown dependency's authority. Alderney — a self-governing island of roughly 2,000 people — has long leveraged its issuing rights to produce prestige bullion pieces that no mainland British authority would sanction at this scale.

At just over a kilogram of 22-carat gold, the practical audience was always institutional collectors and bullion investors rather than anyone pretending it might circulate.