Watch List notes:

THRACE. Ainos. Circa 421/0-419/8 BC. Diobol (Silver, 10.5 mm, 1.30 g, 3 h). Head of Hermes to left, wearing petasos. Rev. ΑΙΝΙ Bull standing to left, his head turned back to right to lick his left hind hoof; all within an incuse square. May, Ainos 227-228 var. Very rare. A beautifully toned and well-centered coin with a superb head of Hermes. Nearly extremely fine.
From the "Collection sans Pareille" of Ancient Greek Fractions and from the Pflieger Collection, Vinchon 13 April 1985, 245.