Silver antoninianus, 21mm, 3.04gm, issued AD 252 Antioch mint.
Obv: IMP CAE C VIB VOLVSIANO AVG, Radiate, draped bust facing right.
Rev: PAX AVGVS, Pax standing left holding branch and sceptre.
References: see Sear 9758, RIC 181, RSC 77.