Constans II, AE Half Follis. AD 641-668, Carthage. 16 mm, 4.13 g.

CONSTANTIN, crowned, mantled bust facing, with longish beard and cross on crown, holding mappa and cross on globe.
Rev: C-T-X-X in the four corners of a cross, star above. 

Sear Byz 1060, DOC 145

With permission of cngcoins.com, auction 229, Lot 479, March 2010.