Crispus. AE Follis. Trier. 317 AD. 

FL IVL CRISPVS NOB CAES, laureate, cuirassed bust right.

CLARITAS REIPBVLICAE, Sol standing left, chlamys across left shoulder,
 holding globe, right hand raised. T-F across fields. 

Mintmark dot ATR. 

RIC VII Trier 152 var. Unpublished var. 

The earlier series (RIC 124-126) has T-F in the fields and no reverse 
break, but no dot before the ATR mintmark. The later series (RIC 148-156 
and 175-183) have a dot before the ATR mintmark but have F-T across the 
fields and a clear reverse break. This coin is possibly an unlisted 
intermediate issue between the two issues. 

With permission of Roma Numismatics, Jul, 2010