Silver tetradrachm, 26mm, 17.11gm, issued 290-288 BC Pella mint.
Obv: Diademed, horned head right.
Rev: BAΣIΛEΩΣ ΔHMHTPIOY, Poseidon standing left, foot up, holding trident, KPE monogram to left, AI monogram to left.
References: see Sear 6764, HGC 1014a.
Scarce.