Constantine I The Great (307/10-337) AE follis (Bronze, 19mm, 3.06g) Nicomedia, 328-9
Obv: CONSTAN - TINVS AVG Head r. wearing triple pearl diadem.
Rev: PROVIDEN - TIAE AVGG Camp gate with two turrets, no doors, star above, SMNB in exergue
Ref: RIC 153