Watch List notes:

Sovereign 1843 3 over inverted 2:- Note: the 8 4 3 are evenly spaced, the 1 and 8 showing signs of doubling. The underlying 2 shows at the top right of the horizontal stroke and between the downward stroke and ball of the 3. (visible under 10x magnification) Fine, a very rare type

Estimate: 500-750 GBP