Constans, AE4, Constantinople.

Obv: DN CONSTA-NS PF AVG, pearl and rosette-diademed head only, right.
Rev: GLOR-IA EXERC-ITVS, two soldiers holding spears and 
shields with one standard between them, O on banner.

Mintmark: CONSS.

RIC VIII Constantinople 45, rated C3

From Dane's collection, Aug. 2010.