Watch List notes:

British Coins, William IV, proof pattern sovereign 1830, 2nd bust, rev. crowned garnished shield of arms, plain edge (S.3829B; WR.260 as R5), certified and graded by PCGS as PR63 Deep Cameo, faintest hairlines in the fields, splendid frosted portrait of the new king as well as deep frosted contrast on the reverse shield, a beautiful example of the first sovereign date of this reign, struck prior to the coronation (on 8 September 1831)
Estimate: 12500-15000 GBP