Rare commemorative follis minted by Constantine I the Great.
Rarity in Roman Imperial Coinage is R2.
Roman Imperial
Constantine I the Great (307–337), Follis 330-331, Lugdunum mint
Obverse: helmeted and cuirassed bust of Roma left
VRBS ROMA
Reverse: She-wolf, standing left, suckling twins; above, two stars, PLG in exergue
Diameter 13 mm, weight 1.05 g