Rare follis, R4 in the Roman Imperial Coinage catalogue.
Roman Imperial
Constantine I the Great (308-324), Follis 319-320, Siscia mint
Obverse: helmeted laureate, cuirassed bust right
CONSTANTINVS AVG
Reverse: two Victories standing facing one another holding shield inscribed VOT PR on altar decorated I letter, ΓSIS* in exergue
VICTORIAE LAETAE PRINC PERP
Diameter 21 mm, weight 2.75 g