Watch List notes:

Arab-Byzantine, a Byzantine Follis of Constans II, countermarked with monogram on reverse, 3.13g (Goodwin A1). Host coin and countermark fine.

Reference: Goodwin, T., 'Countermarking in Seventh Century Syria, Part II: Countermarks from after the Arab Conquest', Supplement to ONS Newsletter 183, 2005

Estimate: £30-40