IMP C FL VAL CONSTANTINVS PF INV AVG (IMPerator Caesar FLavius VALerius CONSTANTINVS Pius Felix INVictus AVGustus) 23 mm. 4.05 grams. IOVI CONSERVATORI AVGG Jupiter standing left holding globe, A in field right, wreath in field left. SMHT (Heraclea Thracia) RIC VI Heraclea 72 "Scarce, c. 312" It has "INV" for INVICTVS ("Unconquered") in the legend. That is somewhat unusual, although that title is sometimes used by other rulers, too. Melville Jones, in Dictionary of Roman Coins (A book I recommend), says it is "an epithet which was applied to the gods Hercules, Jupiter, and Mars on Roman coins, and to some emperors." Show us a coin with the title INVICTVS on it!