Kings of Mercia, Offa AR Penny. Canterbury mint. Light Coinage, Group I, ca 784-787. Moneyer Eoba or Heaberht. 1.27 g.

OFRM around in angles of a cross formed by dots with A or K at it left and right ends, circle of dots in centre containing a small cross or X.
EOBA in the outer angles of a Celtic cross pattee, with a circle in the centre containing a small cross with a dot in each angle. 

Seaby 904; North 261v.

Images & text re-used by permission, courtesy of Ira & Larry Goldberg Auctioneers, Beverly Hills, CA