Creo que es un antoniniano de Filipo II como césar de la ceca de Roma:
Philip II, as Caesar, AR Antoninianus. M IVL PHILPPVS CAES, radiate, draped & cuirassed bust right / PRINCIPI IVVENT, the prince standing left, holding globe & sceptre. RIC 218d var, RSC 48 var. (left facing reverse with sceptre.
http://wildwinds.com/coins/ric/philip_II/RIC_0218v.jpg
Un saludo
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"Qvod tibi fieri non vis, alteri non feceris"