Hello Idan,
It is an Ae3 nummus minted in the 5th officina of Antioch during the year 325-326 for the cesar Crispus ;
Obverse : Laureate, draped and cuirassed bust left.
Lettering : FL IVL CRISPVS NOB CAES
Translitteration : Flavius Julius Crispus, Nobilissimus Caesar.
Reverse : Camp gate with two tours upon ; star above.
Lettering : PROVIDEN - TIAE CAESS ; SMANTE in exergue.
Translitteration : Providentiae Duorum Caesarum ; Sacra Moneta Antiochensis Quinta.
Reference : RIC.64
Rarity : R2.