Rare commemorative follis minted by Constantine I the Great.
Rarity in Roman Imperial Coinage is R1.
Roman Imperial
Constantine I the Great (307–337), Follis 313-315, Constantinople mint
Obverse: helmeted and cuirassed bust of Roma left
VRBS ROMA
Reverse: She-wolf, standing left, suckling twins; above, two stars, CONSIA in exergue
Diameter 19 mm, weight 2.68 g