Watch List notes:

THRACE, Byzantion. Alliance coinage with Kalchedon. Late 3rd-2nd centuries BC. Æ (22mm, 5.46 g, 12h). Diademed head of Poseidon left / Prow left. Schönert-Geiss, Byzantion 1290–5; Türkoğlu A4; HGC 3, 1430. Brown surfaces, green deposits, rough surfaces. Near VF. Very rare.