Constantine IV Pogonatus (668-685). AE Decanummium, Constantinople mint, 668-674. Obv. Helmeted and cuirassed bust facing, holding globus cruciger. Rev. Large I (mark of value); ti left and above, cross; to right, K. MIB 88; D.O. 38; Sear 1182. 4.75 g. 22.00 mm. Overstruck on an earlier coin. About VF.