Watch List notes:

Sixpence 1837 Milled Edge Proof ESC 1681 nFDC with attractive old toning, the reverse choice, Excessively rare, rated R6 by ESC, slabbed and graded CGS 82, purchased Spink 29/9/09 described by them as "toned, as struck, exceedingly rare" ex Baldwins A52 September 2007 lot 652. Described by Steve Hill in the catalogue as "Toned, as struck and of the highest rarity, this is the first example that the cataloguer has seen"

Estimate: 3250-3750 GBP