Constantine IV, Pogonatus (668-685). AE Half Follis, Ravenna mint. D/ Helmeted and cuirassed bust, three-quarter face to right, holding spear and shield. R/ Large K between A/N/N/O and X/X/II (?);. D.O. 93; Ranieri cf. 743-47; Sear cf. 1241. AE. g. 1.57 mm. 15.00 RR. Very rare. Clipped irregular flan. Emerald greeen patina. VF.