Antoninus Pius (138-161) AR Denarius (Silver, 2.95g, 18mm) Rome, 148-149.
Obv: ANTONINVS AVG PIVS P P TR P XII, laureate head right
Rev: COS IIII, Salus standing left, feeding snake coiled round altar to left and holding rudder set on globe
Ref: RIC III 181.