Rare follis, R2 in the Roman Imperial Coinage catalogue.
Roman Imperial
Constantine II (337–340) - as Caesar 317–337, Follis 330–335, Heraclea mint
Obverse: laureate, cuirassed bust right
CONSTANTINVS IVN NOB C
Reverse: two soldiers with spears, between them two legionary banners, •SMHΓ in exerque
GLORIA EXERCITVS
Diameter 18 mm, weight 1.88 g