Watch List notes:

(x) Stephen (1135-54), Penny, 0.93g, Northampton, Willam (?), crowned and diademed bust right, holding sceptre in right hand, rev. + [...]e[.] n. noh, rev. cross moline, annulets at ends, pellet in annulet in each angle (Mack 197; S.1325), almost very fine, an extremely rare type with a clear mint signature.
Provenance:
Baldwin auction 19, 4 May 1999, lot 451
BNJ Coin Register 1993, no. 260
Metal dector find, Paulerspury, Northamptonshire, summer 1993

A classic late Watford type obverse with a very distinctive reverse, the only known example.
Estimate: £1200 - £1500