Watch List notes:

British coins and tokens, Elizabeth II, 2019, proof silver five pounds, The Great Engravers Collection, head r., wearing tiara, rev. Una and the lion, certified and graded by NGC as Proof 69 Ultra Cameo
One of only 3000 issued. The first design issued in the 'Great Engravers of the United Kingdom' collection in 2019 by the Royal Mint.
These are difficult to estimate accurately as the market is quite volatile.