Watch List notes:

Henry VI first reign (1422-61), Halfgroat, Annulet issue, York, 1.53g, 8h, m.m. pierced cross (on obv. only), lis either side of bust, saltire stops, rev. annulet stops, including an additional annulet in second and third quarter and after raci (Whitton 4; Lessen, obv. die 2/rev. die 2, BNJ 1993, pl. 8, 16/15 same dies; N.1430; S.1843) a piece of flan absent at 6 o'clock, and a hint of creasing to flan, otherwise a pleasing portrait coin, a bold very fine, extremely rare.
provenance
D I Greenhalgh, part I, DNW 99, 14 March 2012, lot 81 [with his tickets]
Ivan Buck, Spink 176, 30 November 2005, lot 121 - £800
Found whilst metal detecting in Kent, 'between 1993 and 1998' (via S Shipp)
,
Three of the five York annulet coinage Halfgroats recorded by Lessen are in museum collections. This coin provides a new die combination.
Estimate: £600 - £800