Constantius II. 337-361 AD. AE3. Struck AD 350-355. Antioch
  mint. 

D N CONSTAN-TIVS P F AVG, diademed, draped and cuirassed bust right.
FEL TEMP RE-PARATIO, soldier spearing horseman who is 
falling forwards, clutching the horse's neck.

Gamma in left field
Mintmark AN Gamma.

RIC VIII 135; LRBC 2623. 

With permission of Münzzentrum Köln, auction 161, lot 723. 2012.