Constantine AE Follis. 312-313 AD. 

CONSTANTINVS PF AVG, laureate, cuirassed bust right
SOLI INV-I-CTO COMITI, Sol, radiate, standing right, head left, 
holding globe and raising right hand. 

Mintmark PT.
RIC VI Ticinum 131a

Contributed by Bob Dyer, Jan. 2014