Watch List notes:

Mercia, Offa (757-796), Penny, Heavy coinage, South Eastern, non-portrait type, London, Diola, 1.15g, 3h, + offa|rex in two lines, uncial m flanked by pellet-trefoils above, rev. voided long cross pommée, di|o|la|+ lozenge o in angles, a pellet towards centre of second, third and fourth quarter (Chick 204b; cf. Coin Register, 1987, no. 108; CEB -; N.330/1; S.908), ragged edge and somewhat porous in appearance, otherwise very fine, the moneyer very rare for Offa, this being only the second example recorded since 1987.
provenance
Woolley and Wallis auction, Salisbury, 23 October 2003, lot 363
~ Coin Register, 2003, no. 142 ~
Reportedly found Monkton Deverill, Wiltshire, c. 1990
Estimate: £800 - £1,000