Watch List notes:

British Coins, Victoria, proof sovereign, 1871, plain edge, large BP, struck en médaille, young head l., rev. St. George and the dragon (S.3856; W&R.319 [R7, one or two specimens known]; DM.209), certified and graded by PCGS as Proof 64 Deep Cameo, exceedingly rare
Only two other examples graded PF64DC by PCGS.
(8000-10000 GBP)