Constans II, 641-668. 12 Nummi (Bronze, 20 mm, 9.71 g, 7 h), possibly overstruck on an Alexandrian potin tetradrachm of the 260s-270s, Alexandria, late 645-May 646. Squat figure of the crowned and draped emperor standing facing, holding along cross in his right hand and globus cruciger in his left. Rev. Cross potent on globe between I B; in exergue, ΑΛΕΞ. DOC 105. MIB 189. SB 1027. Rare. Clear and with a dark green and reddish-brown patina. Good very fine.

This coin must have been struck during the very short period (late 645-May 646) in which the Byzantines held Alexandria after reconquering the city from the Arabs who had captured it in 641 (a rarer issue of Constans had been produced early that year, prior to the city's conquest - MIB 188).