Thrace, Byzantion. Alliance coinage with Kalchedon, late 3rd-2nd century BC. Æ (26mm, 10.36g, 12h). Wreathed and veiled head of Demeter r. R/ Poseidon seated r., holding aphlaston and trident; monogram to inner r. SNG BM Black Sea 83 var. (monogram); HGC 3.2, 1428. VF - Good VF