Antoninus Pius AR Denarius. Rome, AD 151-152. IMP CAES T AEL HADR ANTONINVS AVG PIVS P P, laureate head right / TR POT XV COS IIII, Tranquillitas standing right, holding rudder on globe and corn ears; TRANQ in exergue. RIC 218 Weight : 3.46 gr Diameter : 17.52 mm