Constantine IV, Pogonatus (668-685). AE Half Follis, Ravenna mint. D/ Helmeted and cuirassed bust facing, holding spear and shield. R/ Large K between A/N/N/O and X/X/VI/II; above, cross; beneath, [RAV]. D.O.-(cf. 93); Sear - (cf. 1241); Ranieri 747. AE. g. 1.94 mm. 19.50 RR. Very rare. Dark green patina, with lighter green and reddish-brown spots. F/VF.