Antoninus Pius (138-161) AR denarius (Silver, 3.53g, 17mm) Rome, 151-152.
Obv: IMP CAES T AEL HADR ANTONINVS AVG PIVS P P, laureate head of Antoninus right
Rev: TR POT XV COS IIII, Tranquillitas standing facing, head right, rudder in right hand, corn ears in left; TRANQ in exergue.
Ref: RIC III 218.