It's a city commemorative like these, but I can't make out the mint on your coin: CONSTANTINOPOLIS COMMEMMORATIVE AE3/4 OBVERSE: CONSTANTINOPOLI, laureate, helmeted & mantled bust left holding scepter REVERSE: Victory standing left, foot on prow with sceptre and leaning on shield, CONS Gamma in ex. Struck at Constantinople, 330-33AD 2.2g, 15mm RIC VII 63 CONSTANTINOPOLIS COMMEMMORATIVE AE3/4 OBVERSE: CONSTAN TINOPOLIS, laureate, helmeted & mantled bust left holding sceptre REVERSE: Victory standing left on foot of prow with sceptre and leaning on shield, •BSIS• in ex. Struck at Siscia , 334-335 AD 2.39g, 17mm RIC 241 CONSTANTINOPOLIS COMMEMMORATIVE AE3/4 OBVERSE: CONSTANTINOPOLIS, crested, laureate helmeted bust of Constantinopolis left in imperial mantle & holding sceptre REVERSE: Victory with open wings standing left, right foot on a vessel's prow holding sceptre & leaning on shield. Mintmark SMTSD Struck at Thessalonica , 330-33 AD 2.3g 18mm RIC VII 188