Constantine I. AE Follis. Ticinum.

IMP CONSTANTINVS PF AVG, laureate, draped, cuirassed bust right

MARTI CON-SERVATORI, Mars standing right, helmeted, in
 military dress, cloak over right shoulder, holding 
upright spear, point downwards, left hand on shield.

Mintmark: PT

RIC VII Ticinum 5, rated R5

From Dane's collection, Jan. 2010.