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Greek Italy. Northern Lucania, Posidonia. AE 16.5 mm, c. 420-390 BC. Obv. Head of Athena right, wearing Attic helmet with laurel-wreath. Rev. Poseidon advancing right, wielding trident overhead; ΠOΣE. HN Italy 1155; SNG ANS 720; SNG Cop. 1323; HGC 1 1173; Grunauer V. 2.54 g. 16.50 mm. RR. Very rare. Green patina. VF/Good VF.