Constantine I, AE3, 318-319, Rome, Officina 3
CONST_ANTINVS AVG
Laureate, helmeted, cuirassed bust right
VIRTV_S AVGG
Campgate with six rows, three turrets, closed three-paneled doors with pellets
inside larger archway, no star above, top and bottom rows empty blocks
P | R in fields
RT in exergue