Constantine I. AE Follis. 310-313 AD. Trier. 

CONSTANTINVS PF AVG, laureate, draped, cuirassed bust right,
 seen from the back

SOLI INVIC-TO COMITI, Sol radiate, standing facing, head left,
 chlamys draped over upper chest and left shoulder, holding
 globe and raising right hand.

T-F across fields. 
Mintmark PTR. 

RIC VI Trier 875. Scarce.

With permission of Roma Numismatics, October, 2009