Watch List notes:

BRITISH COINS, Coenwulf, King of Mercia (796-821), Silver Penny, large portrait phase 810-822/23, Canterbury, moneyer Dealla, bust left, without diadem, within inner-circle, +COENVVLF REX M, uncial M, rev cross crosslet pellet in each angle within inner circle, +DEALLA MONETA, 1.22g (Naismith C38.3; N 356; S 916). Minor perforations by edge at end of obverse legend, slightly dished, full large flan, even dark tone, very fine and rare.
found on the Thames foreshore at London

Estimate: £800-1200