Constantius II, AE4, Cyzicus.

DN CONSTAN-TIVS PF AVG, laureate head right
GLOR-IA EXERC-ITVS, two soldiers holding spears and shields with one standard between them. Dot on banner.
Mintmark: SMK gamma crescent. 

RIC VIII Cyzicus 32, rated Rare.

From Dane's collection, August 2010.

Known mintmarks for this RIC number:
SMKA crescent
SMKB crescent
SMK gamma crescent
SMK delta crescent
SMK epsilon crescent
SMKS crescent