Constantius II. AE Follis. 326 AD. 

FL IVL CONSTANTIVS NOB C, laureate, draped, cuirassed bust left
PROVIDEN-TIAE CAESS, campgate, two turrets, 6 layers, no door. 

Mintmark SMHB dot. 

RIC VII Heraclea 84. Rare (R2).

With permission of Roma Numismatics, Mrz. 2010