Silver antoninianus, 21mm, 3.67gm, issued AD 251/252 Antioch mint.
Obv: IMP C C VIB TREB GALLVS PF AVG, Radiate, draped bust facing right.
Rev: SAECVLLVM NOVVM, Hexastyle temple with seated statue of Roma.
References: Sear 9648, RIC 91, RSC 111.
A revival of anniversary type.