Watch List notes:

5 x Tristan da Cunha, Gold Proof Sovereigns 2015, 'The 2015 Queen Elizabeth II Longest Reigning Monarch Portrait Collection', rev. each featuring a design after the originals by Gillick, Machin, Maklouf and Rank-Broadley, .916 (22ct) gold, weight 7.98g, limited edition no. 92 of 999, housed in the London Mint Office display case with certificate of authenticity, one coin missing part of its capsule, otherwise GEF or better.
(Estimate: 1300 - 1500 GBP)