Watch List notes:

Victoria, proof shilling, 1871, third young head left, rev. 'face' value within wreath, crown above, date at bottom, plain edge (S.3906A; ESC.3040), certified and graded by NGC as Proof-65+, lovely golden grey toning, the surfaces superbly preserved, nearly as struck and an extremely rare proof of record
The only one graded as Proof-65+ by NGC, none higher.

Estimate: 3500 - 4000 GBP