Antoninus Pius (138-161) AR Denarius (Silver, 19mm, 2.98g) Rome, 151-152.
Obv: IMP CAES T AEL HADR ANTONINVS AVG PIVS P P, laureate head right
Rev: TR POT XV COS IIII, Pax standing left, holding branch and sceptre; PAX in exergue.
Ref: RIC 216a