Watch List notes:

MYSIA. Kyzikos. Circa 550-500 BC. Hemiobol (Silver, 7.5 mm, 0.55 g). Stag's head facing between two tunny fish swimming upwards. Rev. Quadripartite incuse square. Klein 263. SNG Paris -. Von Fritze II -. Very rare. Well-centered and lightly toned. Minor striking crack, otherwise, good very fine.
From the "Collection sans Pareille" of Ancient Greek Fractions, acquired from an English dealer in the 1970s for £14/10/-.

This coin was sold as being from Delphi (!), presumably as a variant of a trihemiobol like the one that appears above as lot 300.