Watch List notes:

Thrace, Byzantion in alliance with Kalchedon Æ 26mm. 3rd century BC. Veiled head of Demeter to right / Poseidon seated to right, holding aphlaston and trident; ΒΥΞΑN to right, ΚΑΛΧΑ to left, monogram in inner right field. Cf. Schönert-Geiss 1271-5; cf. SNG BM Black Sea 83; HGC 3.2, 1428. 8.24g, 26mm, 12h.

Near Extremely Fine; flan crack, usual pitting.

From the inventory of a UK dealer.