Constantius II, AE3, Rome mint. 20-22 mm 4.09g. 

DN CONSTAN-TIVS PF AVG, laurel and rosette-diademed, draped and 
cuirassed bust left, holding globe, N behind head.
FEL TEMP REPARATIO, Emperor nimbate and in military dress, 
shield on left arm, on horseback galloping right, thrusting 
spear at two barbarians wearing Phrygian helmets, who 
kneel before him with their arms raised towards him.
N in left field.
Mintmark RP or R epsilon

RIC VIII Rome 154, rated R2.

With permission of cgb coins, France, on vcoins.com, March 2012.