Creo que es un antoniniano de Treboniano Galo:
Trebonianus Gallus AR Antoninianus. IMP CAE C VIB TREB GALLUS AUG, radiate, draped & cuirassed bust right / APOLL SALVTARI, Apollo standing left with branch & leaning on lyre set on rock. RIC 32, RSC 20.
http://wildwinds.com/coins/sear/s2779.html#RIC_0032
Un saludo
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"Qvod tibi fieri non vis, alteri non feceris"