Constantius II, AE of Aquileia.

DN CONSTAN-TIVS PF AVG, pearl diademed, draped, cuirassed bust 
right, A behind head.
FEL TEMP RE-PARATIO, soldier spearing fallen horseman who is
bare-headed, reaching backwards.
LXXII in left field.
Mintmark AQS

RIC VIII Aquileia 187, rated scarce.

Courtesy of Hellenika Ancient Numismatics on vcoins.com.