Constantine I AE Follis. Ticinum mint, AD 312-313. 

CONSTANTINVS PF AVG, laureate, cuirassed bust right
MARTI CON-SERVATORI, Mars standing right, helmeted and 
in military dress, cloak spread over upper chest, 
holding upright spear, point downwards, left hand on shield. 

Mintmark TT.

RIC VI Ticinum 124a. 

With permission of Roma Numismatics, March 2014.