Constans II with Constantine IV. 641-668 AD. AE Follis - 40 Nummi (30mm, 13.21g). Constantinople mint. Constans, with long beard, wearing crown and military dress, holding long cross, and Constantine IV, crowned and wearing chlamys, holding cross on globe, standing; cross between their heads / Large M; A/N/N/O - date across field, cross above, A or Δ below, CON in exergue. SB 1010, MIB 174b,d. Overstruck on an uncertain earlier issue. Rare!