Rare follis minted by Constantine I the Great.
R2 in Roman Imperial Coinage catalogue.
Roman Imperial
Constantine I the Great (306–337), Follis 330-333, Constantinople mint
Obverse: diademed, draped and cuirassed bust right
CONSTANTINVS MAX AVG
Reverse: two soldiers holding spears and shields, two standards between them, CONSH in exergue
GLORIA EXERCITVS
Diameter 17 mm, weight 2.73 g