Constantius II AE follis, Cyzicus. 

FL IVL CONSTANTIVS NOB C, laureate, draped, cuirassed bust right.
GLOR-IA EXERC-ITVS, two soldiers standing, each holding spear and 
shield with two standards between them with dot on banners. 

Mintmark SMK delta. 

With permission of Roma Numismatics, April, 2011

Known officinae for this issue:
SMKA
SMKB
SMK gamma
SMK delta
SMK epsilon
SMKS