Watch List notes:

THRACE, Byzantion. Alliance coinage with Kalchedon. Late 3rd-2nd centuries BC. Æ (25mm, 9.09 g, 12h). Wreathed and veiled head of Demeter right / Poseidon seated right, holding aphlaston and trident; uncertain control mark to inner right. Cf. Schönert-Geiss, Byzantion 1257–82; Türkoğlu A2a; HGC 3, 1428. Green-brown surfaces, light roughness and pitting, edge split, some encrustation. VF.