Rare follis minted by Constantine I the Great.
R3 in Roman Imperial Coinage catalogue.
Roman Imperial
Constantine I the Great (307–337), Follis 318-319, Siscia mint
Obverse: helmeted, cuirassed bust right
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 18 mm, weight 2.95 g