Constantine II, Rome, AE4. 

VIC CONSTANTINVS AVG, laurel and rosette-diademed, 
cuirassed bust right.
VIRTVS AVGVSTI, Emperor standing facing, head right, 
holding reverse spear, leaning on shield. 

Mintmark R palm branch dot P.

RIC VIII Rome 43.

Contributed by Vincent of forum ancient coins, April 2013.