Watch List notes:

The Hardcastle Collection | PROOF 65+ BROWN | George IV (1820-30), Proof Farthing, 1826, laureate head left, rev. Britannia seated right, shield with two incuse lines, edge plain (Stratos = Gemini 224; Cooke 249; Peck 1440; S.3825), Uncirculated with a pleasing old toning, reverse with miror-like surfaces, in NGC holder, graded PF65+ BN (Cert. #5878622-014) [1 of 1 / 1 Finer].
https://www.ngccoin.com/certlookup/5878622-014/65/
Estimate: £250 - £350