Lucania, Poseidonia-Paestum, AE16; 3.38 gr., 3rd c. BC,

Poseidon advancing right, wearing chlamys, striking with trident, left arm extended / POSEIDA on raised band beneath dotted line, bull butting right, head facing. Above a dolphin swimming in a circle to right. 

BMC 69.

Estimate 20 Eur.
courtesy of Asta Tintinna Numismatica and deamoneta.com, Jun, 2010