Watch List notes:

IONIA. Erythrai. Circa 500-480 BC. Diobol (Silver, 11 mm, 1.23 g). Nude hero riding a horse galloping to right. Rev. Irregular incuse square. BMFA 1834. Rosen, ACNAC 5, 574 (this coin). Lightly toned and attractive. About extremely fine.
From the "Collection sans Pareille" of Ancient Greek Fractions, ex Münzen und Medaillen FPL 516, November/December 1988, 49, and from the collection of J. Rosen, Monnaies et Médailles 72, 6 October 1987, 271, ex Münzen und Medaillen FPL 373, November/December 1975, 76.