Parece un antoniniano de Claudio II de la ceca de Roma tipo GENIVS AVG:
Claudius Gothicus AE Antoninianus. Rome, AD 268-270. IMP C CLAVDIVS AVG, radiate, cuirassed bust right / GENIVS AVG, Genius standing left, by altar, holding patera and cornucopiae. In right field: Gamma, Z or nothing. Sear5 11339.
http://wildwinds.com/coins/ric/claudius_II/RIC_0045.jpg
Un saludo
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"Qvod tibi fieri non vis, alteri non feceris"