Watch List notes:

Thrace, Byzantion in alliance with Kalchedon Æ 29mm. 3rd century BC. Veiled head of Demeter to right / Poseidon seated to right, holding aphlaston and trident; ΒΥΞΑNTIΩ to right, ΚΑΛΧΑΔ to left. Schönert-Geiss 1276-82 var (rev. legend); HGC 3.2, 1428 var. (same). 8.42g, 29mm, 12h.

Extremely Fine.

From the inventory of a UK dealer.