Marcus Aurelius, as Caesar under Ant. Pius. AR denarius. Struck AD 160-161. 3.36 g. 

AVRELIVS CAESAR AVG PII F, bare head right, slight drapery
on left shoulder.
TR POT XV COS III, Mars standing left, holding spear and 
resting hand on shield. 

RIC 489; RSC 780; Sear -. 

With permission of H. D. Rauch GmbH, April 2006.
Estimate: 90 euros.