Marcus Aurelius, AE As, AD 161-180. 21mm, 10.74 g. Rome. Struck AD 177. 

M ANTONINVS AVG GERM SARM TRP XXXI, laureate, draped and cuirassed bust right.
IMP VIII COS III FELICITATI AVG P P around and in upper centre, SC below, galley rowed left by four oarsmen, Neptune, holding trident and dolphin or aplustre, standing left at the stern. 

RIC III 1194. 

With permission of cngcoins.com, Mail Bid Sale 73, Lot 627, Sept. 2006.