1 Crown - Elizabeth II Sapphire Jubilee - Gold

Tristan da Cunha, a British Overseas Territory in the South Atlantic with a permanent population of fewer than 300 people, issues commemorative coinage through the pobjoy Mint under a franchise arrangement — the island has no circulating currency of its own. The 2017 Sapphire Jubilee issue marks Elizabeth II's 65th year on the throne, a reign milestone no British monarch had previously reached.