Watch List notes:

Elizabeth II, Proof Half Sovereign 2020, 'George III 200th Anniversary', obv. Clark portrait of the Queen, rev. Pistrucci, GR privy mark to left of date in exergue to commemorate the 200th anniversary of the death of George III, encapsulated in Royal Mint case of issue with certificate of authenticity, limited edition no. 1454 of 2000, FDC.
(Estimate: 200 - 250 GBP)