Coin depicted roughly twice actual size*

As of Marcus Aurelius

Bronze as, 27mm, 14.56gm, issued AD 165/166 Rome mint.

Obv: M ANTONINVS AVG ARMENIACVS PM, Laureate, draped bust right.

Rev: TRP XX IMP III COS III S C, Roma, helmeted, draped, seated left, holding palladium in right hand and spear in left hand; behind her, shield.

References: see Sear 5030, RIC 921.