Rare Helena follis, in the Roman Imperial Coinage catalog, R4 rarity.
Roman Imperial
Constantine I the Great (308-324), Follis 335-337, Alexandria mint
Obverse: helmeted and cuirassed bust of Roma left
VRBS ROMA
Reverse: she-wolf left with twins, two stars above, SMALA in exerque
Diameter 18 mm, weight 2.34 g