Watch List notes:

NGC PF62 BN | Victoria (1837-1901), Proof Half-Farthing, 1839, in bronzed copper, young head left, rev. value and date, crown above, edge plain, 6h (BMC [Peck] 1591; Spink 3951), faint cabinet friction in otherwise bronzed and brilliant fields with delectable flares of bluish patination, a pleasing extremely fine, as issued in the fabled 1839 Proof Sets, in NGC QR holder, graded PF62 BROWN (Cert. #6767926-001).
https://www.ngccoin.com/certlookup/6767926-001/62/
Estimate: £140 - £200