Watch List notes:

Thrace, Byzantion in alliance with Kalchedon Æ 21mm. 2nd century BC. Head of Athena to left, wearing crested Corinthian helmet / Cow standing to left; ΒΥΞΑN above, ΚΑΛΧΑ below. Schönert-Geiss 1252-4; HGC 3.2, 1431 (R2); Naumann 102, lot 68 var. (Athena head to right - hammer: 575 EUR). 4.39g, 22mm, 12h.

Good Very Fine. Extremely Rare.

From the inventory of a UK dealer.