Constantine I. AE Follis, 22mm. Ticinum. 312-313 AD.

Obv: CONSTANTINVS PF AVG, Laureate, cuirassed bust right
Rev: MARTI CON-SERVATORI, Mars, standing facing, head right, 
helmeted, in military dress, holding upright spear, point
 downwards, left hand on shield

Mintmark: ST

RIC VI Ticinum 125, rated Rare.

From Dane's Collection, May 2010.