Antoninus Pius (138-161) AR Denarius (Silver, 3.28g, 18mm) Rome, 151-152.
Obv: IMP CAES T AEL HADR ANTONINVS AVG PIVS P P, laureate head to right
Rev: TR POT XV COS IIII, Pax standing left, holding branch and sceptre; PAX in exergue.
Ref: RIC 216a.