Constantius II, AR Light Miliarensis. Constantinople. 4.55 g. AD 337. 

FL IVL CONSTANTIVS NOB C, laureate, draped, cuirassed bust right.
GLORIA EXERCITVS, Securitas standing left, legs crossed, 
leaning on column and holding laurel branch.

Mintmark C dot Gamma. 

RIC VII Constantinople 134. 
Rated rare.