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Constans II (641-668). AE Follis, Ravenna mint. Dated RY 4 (644/5). Obv. Crowned facing bust, wearing chlamys, holding globus cruciger. Rev. Large M between A/N/N/O and II/II; above, cross; below, A; in exergue, RAV. Sear 1137; D.O. 12; MIB 224b. 4.70 g. 19.50 mm. RR. Very rare. VF.