Constantine I. AE follis. Siscia. AD 315-316. 

IMP CONSTANTINVS PF AVG, laureate head right
IOVI CON-SERVATORI, Jupiter standing left, chlamys across 
left shoulder, holding Victory on globe and sceptre, 
eagle with wreath at foot left. 

Officina letter B in right field. 

Mintmark dot SIS dot. 
RIC VII Siscia 15.
Rated R1.

Offered by Iseum Coins on vcoins.com.