Hadrian AE Sestertius. 

HADRIANVS AVGVSTVS, laureate head right, slight drapery on left shoulder.
COS III S-C, Neptune standing right, cloak over left thigh, left foot on prow, holding acrostolium and trident.

RIC 633; Sear :-.

Courtesy of TimeLine Originals (www.time-lines.co.uk), Jan, 2011