Watch List notes:

William I (1066-87), Penny, bonnet type, Nottingham, Forner, 1.26g, crowned and diademed bust facing, rev. forn on snotinci, voided short cross with crescent finials, piles in angles (N.842; BMC II; S.1251), about very fine, very rare.
provenance
Bt. Seaby, 1975, £350 - "Only 1 in the BMC (No. 134) which is chipped with the mint name incomplete, extremely rare"
Estimate: £1,200.00 - £1,500.00