Paestum, Lucania, AE Semis, ca. 2nd century BC. 17mm, 3.03g. 

Laureate head of Neptune right; S to left.
Trident; SQ and legend to left and right of the prongs. 

HN Italy 1220; Crawford 13.
Overstruck on an AE Triens (Female Head / Cornucopiae. HNItaly 1205). Green patina. Toned. Rare. VF 

With permission of London Ancient Coins, Auction May 2012.