Not Commodus, but his father Marcus Aurelius as Caesar under Antninus Pius.
Marcus Aurelius, as Caesar, AR Denarius. 152-153 AD.
Obverse: AVRELIVS CAE-SAR AVG PII FIL, bare head right
Reverse: TR POT VII COS II, Genius Exercitus or Virtus standing left, sacrificing out of patera over lighted altar and holding legionary eagle.
RIC 458: BMCRE 804 (Pius); RSC 661