Constantius II, AE Follis, 324-325 AD. 

Obv: CONSTANTIVS NOB CAES, laureate, draped, cuirassed bust 
right.
Rev: PROVIDEN-TIAE CAESS, campgate, 2 turrets, 6 layers, 
star above, no doors. 

Mintmark STR. 

RIC VII Trier 457. Extremely rare (R4)

With permission of Roma Numismatics, December, 2010

_trier_RIC_vII_457