Commodus as Caesar AD 166-177. AR denarius. AD 177-178. 

L COMMODVS AVG, laureate, draped bust right.
COS P P, Salus, seated left, holding branch over 
serpent coiling up from ground on left, left arm on 
side of chair. 

RIC 654; BMCRE 766; Cohen 66.

With permission of cngcoins.com, the AK collection sale,.