Constantine I AE Follis. 318 AD. 

Obv. IMP CONSTANT-INVS AVG, cuirassed bust left wearing high crested helmet, spear across right shoulder, shield on left arm. 
Rev. VICTORIAE LAETAE PRINC PERP, two Victories standing facing one another, holding shield inscribed VOT PR on altar, decorated with X (Helv. 7s); mintmark BSIS star in ex. 

RIC VII Siscia 50 var (unlisted obv. break). Rare.

Contributed by Dane for Roma Numismatics, June 2009