This coin is completely wrong...
Descrived as: Constantine I, Contemporary Imitation, Commemorative AR Follis. Siscia, AD 334-335. Helmeted and mantled bust of Roma left / She-wolf standing left, suckling the twins Romulus and Remus; two stars above; ΓSIS. Unpublished and Unique. Cf. RIC 240; LRBC 750. 2.86g, 17mm, 12h. Attractively toned, edge slightly filed (silver test on 6h), Good Very Fine. In ancient times, it was customary to replace real coins with contemporary imitations or pseudo-coins to leave with the dead during burial so that the deceased could pay (or trick) the boatman Charon to ferry them across the river Styx. Perhaps a regular follis would not have been enough and was replaced with our Urbs Roma Follis in silver. Acquired from Umberto Moruzzi by previous owner. (Including ticket; there as Æ Follis = RIC 240).