Watch List notes:

THRACE, Byzantion, (c.340-320 B.C.), silver siglos (Persian standard), (5.30 g), obv. cow standing to left, on dolphin to left, foreleg raised, above **PU*, rev. quadripartite incuse square of mill-sail pattern, (S.1579, SNG BMC Black Sea 21ff. [siglos], SNG Cop. 476). Extremely fine, rare in this condition.

A similar piece (in this sale) was struck for the twin city Kalchedon on the other side of the Bosphorus.