THRACE. Byzantion, late 3rd-2nd centuries BC. Ae (bronze, 8.56 g, 25 mm), alliance issue with Kalchedon, Bithynia. Veiled head of Demeter to right, wearing wreath of grain ears. Rev. ΒΥZANTI / KAΛΧΑΔ Poseidon seated right on rock, holding aphlaston in his right hand and trident in his left; to right, monogram of ΠΑΡ. HGC 3.2, 1428. Fine.