Constantine II AE3 "Campgate" Constantine II AD 316-340 AE3 

Obv: CONSTANTINVS IVN NOB C - Laureate bust right, draped and cuirassed. 
Rev: PROVIDEN-TIAE CAESS, campgate, two turrets, star above, dot in left field, 
Mintmark SMHA . 
Heraclea mint: 
AD 327-329 = RIC VII, 96