Constantine I. AE light follis. Trier. 310-313 AD. 

IMP CONSTANTINVS AVG, laureate, draped bust right, seen 
from the back. 
MARTI CON-SERVATORI, Mars standing right, helmeted, in
 military dress, holding upright spear, point downwards, 
left hand on shield. 

T-F across fields. 
Mintmark PTR. 

RIC VI Trier 858. Common

With permission of Roma Numismatics, Apr, 2010