Constantine IV, Pogonatus (668-685). AE Follis, Ravenna mint. D/ Helmeted and cuirassed bust facing, holding spear and shield. R/ Large M between Heraclius and Tiberius standing facing; each holding globus cruciger; above, [regnal year]; beneath, Θ; in exergue, RAV. D.O. 87-91; Sear 1239; Ranieri 727-8. AE. g. 4.52 mm. 24.50 RR. Very rare. Untouched dark green patina. F/About VF.