Watch List notes:

THRACE, Byzantion. Circa 340-320 BC. AR Siglos (20mm, 4.84 g). Persic standard. Heifer standing left on dolphin left / Incuse punch of mill-sail pattern. Schönert-Geiss, Byzantion 1–235; HGC 3, 1389. VF, toned, irregular flan, die breaks, rough surfaces, cleaning marks. Possibly a contemporary imitation.