Constantine I, AE Follis, Ticinum, 314-315 AD.

CONSTANTINVS PF AVG, laureate, cuirassed bust right.
MARTI CONSERVATORI, Mars, helmeted and in military dress, 
 standing right, cloak spread over upper chest, holding reversed spear and resting left hand on shield. 

Star in left field. 
Mintmark ST.

RIC VII Ticinum 12.

Rated R5. 

Contributed by Richard Demarco of Carpe Diem Numismatics, April 2020.