Watch List notes:

Victoria, proof 'Gothic' florin, 1851, crowned bust left, rev. crowned cruciform shields, plain edge, struck on medaille (S.3891; ESC.2819), certified and graded by NGC as Proof-65 Cameo, light golden grey toning, an extremely rare date (R6) struck only in Proof state, scarcest version of this excessively rare coin
The only one graded as Proof-65 Cameo by NGC, none higher.

Estimate: 30000 - 35000 GBP