Watch List notes:

THRACE, Byzantion. Alliance coinage with Kalchedon. Late 3rd-2nd centuries BC. Æ (28.5mm, 10.05 g, 12h). Wreathed and veiled head of Demeter right / Poseidon seated right, holding aphlaston and trident; HP monogram to inner right. Schönert-Geiss, Byzantion 1263–70; Türkoğlu A2a; HGC 3, 1428. Dark green-brown surfaces, areas of roughness. VF.