Watch List notes:

Thrace, Byzantion in alliance with Kalchedon Æ 27mm. 3rd century BC. Veiled head of Demeter to right; uncertain c/m to cheek / Poseidon seated to right, holding aphlaston and trident; ΒΥΞΑNT to right, ΚΑΛΧΑ to left. HGC 3.2, 1428. 8.20g, 27mm, 12h.

Extremely Fine; flan crack.

From the inventory of a UK dealer.