Constantine I and Jupiter

Reduced Follis (22 mm) of Constantine I ("The Great"); Unusual obverse legend (unable to find a listing), OB: IMP C FL VAL CONSTANTINIVS PF AVG. ; laureate head l. RX: Jupiter standing l. holding Victory and with staff; eagle hold wreath on the ground with 'E' in the right field. Legend is IOVI CONSERVATORES; SMN in exergy (Smirna mint). Coin has full legends, smooth olive/brown surface. RIC VII# 8, C.291