Hadrian AR denarius, Rome.

IMP CAESAR TRAIAN HADRIANVS AVG, laureate, draped and cuirassed bust right.
PM TR P COS III, galley sailing left with oars, mast and superstructure
for the master.

RIC 113; RSC 1174

With permission of Numismatica Ars Classica - Auction 92 Part 2, Lot 2201, May 2016

Note: Many sellers do not look closely at coins of this type, to check 
whether the galley is sailing left or right. Important characteristics are
- the position of the covered pilot's cabin or seat, which is open in the 
direction of travel (otherwise he wouldn't be able to pilot the galley, right?)
- the position of the rudder.
- the position of the prow extension with ram (if any) beneath it.