A Survey of Ancient Coins
BYZANTIUM/Heraclius CE 610-641 & Heraclius Constantine CE 613-641
AE 12 Nummi, 17 mm, 4.45g, 5h, Alexandria mint c. CE 613-618
O: dd NN hERAC (apparently blundered and not entirely visible here)
facing busts of Heraclius bearded l, and Heraclius Constantine beardless r. each wearing a chlamys and crown with a cross.
R: large IB with cross potent on two steps between. in ex. A