Crispus. AE Follis. Trier. 324-325 AD. 

FL IVL CRISPVS NOB CAES, laureate, draped, cuirassed 
bust right, seen from the back.
PROVIDEN-TIAE CAESS, campgate, two turrets, six layers, 
star above, no door. 

Mintmark STR. 

RIC VII Trier 450. Extremely Rare (R4).

With permission of Roma Numismatics, Apr, 2010