Watch List notes:

THRACE. Byzantion. Circa 340-320 BC. Siglos (Silver, 16 mm, 5.40 g). YΠY Heifer standing left on dolphin. Rev. Incuse square with anticlockwise mill-sail pattern. SNG BM Black Sea 21-28. Lightly toned and attractive. Obverse very slight off center, otherwise, nearly extremely fine.

From the collection of W. F. Stoecklin, Amriswil, Switzerland, acquired prior to 1975.