Hadrian, AE medallion, Rome.
AD 135-137.

Obv: HADRIANVS AVGVSTVS COS III PP, bare head right.
Rev: No legend, Poseidon standing right, left foot on a 
rock, holding trident in right hand and resting left arm on 
his knee, a dolphin downwards on rocks behind him. On the 
right, Athena standing left, left hand on her hip, right 
hand on a branch of an olive tree, against which her spear 
rests; serpent-entwined shield (seen from the interior) 
upright behind her.

Gnecchi III 100b; plate 146, 8; obv. legend var of Cohen 1493 and BMC Medallions 19.
Note: (Gnecchi 100 gives the short legend without COS III PP 
but plate coin 146,8 has the same longer legend as this medallion). 

With permission of TimeLine Auctions 
(www.timelineauctions.com), Apr, 2017