Nice commemorative follis minted by Constantine I.
R1 in Roman Imperial Coinage catalogue.
Roman Imperial
Constantine I the Great (306-337), Follis 330-335, Antioch mint
Obverse: helmeted and cuirassed bust of Roma left
VRBS ROMA
Reverse: She-wolf, standing left, suckling twins, above two stars, SMANΘ in exergue
Diameter 18 mm, weight 2.79 g