Constantine I The Great (307-337) AE Silvered (SIlvered bronze, 3.57g, 20mm) Antioch, 327-8.
Obv: CONSTANTINVS AVG, rosette diademed head to right
Rev: PROVIDENTIAE AVGG, Camp gate, two turrets, no door, star above, nine stone layers, • in doorway, SMANTΓ in exergue.
Ref: RIC VII 81. 3