Marcus Aurelius, AE As, AD 161-180. 21mm, 10.7 g. Rome. Struck AD 177. 

M ANTONINVS AVG GERM SARM TRP XXXI, laureate head right.
IMP VIII FELICITATI AVG P P above, COS III below, SC 
across fields, galley rowed right by three oarsmen, Neptune, 
holding trident and dolphin or aplustre, standing right at the stern. 

RIC III 1195; cohen 191.

With permission of Gemini LLC auction XIII, Lot 185, April 2017.