Watch List notes:

THRACE, Byzantion. Alliance coinage with Kalchedon. Late 3rd-2nd centuries BC. Æ (19.5mm, 5.26 g, 12h). Helmeted head of Athena right / Bull standing left on grain ear; AΔ to left. Schönert-Geiss, Byzantion 1253–4; Türkoğlu A1b; HGC 3, 1431. Green-brown surfaces, brushed. VF. Rare, only two noted by Schönert-Geiss, three in CoinArchives.