Constantius I. Posthumous issue. AE half-follis. 318 AD. 

DIVO CONSTANTIO OPT IMP, laureate and veiled head right
REQVIES OPTIMORVM MERITOR, emperor seated left, holding 
short sceptre and raising right hand. 

Mintmark STR. 

RIC VII Trier 202, rated R4.

With permission of Roma Numismatics, May, 2010