Marcus Aurelius (161-180) AR Denarius (Silver, 3.58g, 18mm) Rome, 164.
Obv: ANTONINVS AVG ARMENIACVS, Laureate head of Marcus Aurelius to right.
Rev: P M TR P XVIII IMP II COS III, Mars standing right, holding spear and resting his left hand on shield set on ground to his right.
Ref: BMC 264. RIC 92