Silver denarius, 19mm, 3.57gm, issued AD 218-222 Rome mint.
Obv: IMP CAES M AVR ANTONINVS AVG, Laureate, draped bust right.
Rev: FIDES EXERCITVS, Fides seated left, holding eagle and standard, another standard before.
References: Sear 7511, RIC 71, RSC 32.
