Very rare follis minted by Constantine I the Great.
R5 in Roman Imperial Coinage catalogue.
Roman Imperial
Constantine I the Great (307–337), Follis 319, Siscia mint
Obverse: helmeted, cuirassed bust left, spear across right shoulder and shield on left arm
IMP CONSTANTINVS AVG
Reverse: Two Victories, winged, draped, facing each other, holding a shield inscribed VOT/PR supported by altar, •ASIS• in exergue
VICTORIAE LAETAE PRINC PERP
Diameter 19 mm, weight 2.66 g