Constantius II, AE4, Cyzicus.

DN CONSTAN-TIVS PF AVG, pearl diademed, draped, cuirassed bust right.
FEL TEMP RE-PARATIO, soldier standing left, spearing
fallen horseman who is wearing a Phrygian helmet, 
reaching backwards.
Dot S dot in left field.
Mintmark SMKB.

RIC VIII Cyzicus 102. 

From Dane's collection, June 2012.