Watch List notes:

(x) Mercia, Offa (757-796), Penny, 1.18g, 12h, light coinage with portrait, c.779-792/3, London, Ealhmund (or Alhmund), +ealhmund, bare headed bust right, breaking beaded inner circle, a 'jewel' on the king's breast, rev. + / o / f / f / a / r / e / x in angles of combined cross of lobes and long cross saltire (Chick 35b this coin; N.299; S.905), good fine, extremely rare.
Provenance:
Noble Numismatics, auction 61, 4 August 1999, lot 1925
Spink Numismatic Circular, July 1988, no. 4629 'about VF, a recent find'

Estimate: £1,500 - £2,000