Constantius II, AE20, Constantinople.

DN CONSTANTIVS PF AVG, pearl-diademed, draped, cuirassed bust right; Delta behind bust.
FEL TEMP RE-PARATIO, soldier standing left, knee
raised, spearing fallen horseman who is unbearded, 
wearing Phrygian helmet, clutching horse's neck.
Gamma dot in left and centre fields.
Mintmark CONSS.

RIC VIII Constantinople 109.
From Dane's Collection, Aug. 2013, ex-David Ruckser.