Me parece que es de la ceca de Siscia 3ª oficina:
Constantine I, AE Follis. Siscia. IMP CONSTANTINVS PF AVG, helmeted, laureate and cuirassed bust right / LAETAE PRINC PERP, two Victories facing & inscribing VOT PR on shield placed on altar inscribed with an X, gamma SIS in ex. Siscia RIC VII 53
Un saludo
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"Qvod tibi fieri non vis, alteri non feceris"