Very rare follis with open campgate.
Roman Imperial
Constantine I the Great (308-337), Follis 327, Arles mint
Obverse: pearl diademed head right
CONSTANTINVS AVG
Reverse: campgate with 4 turrets and open doors, star above, ARLS in exergue
VIRTVS AVGG
Diameter 20 mm, weight 2.80 g