Watch List notes:

IONIA. Erythrai. Circa 480-450 BC. Diobol (Silver, 12 mm, 1.63 g, 3 h). Pegasos flying to right; in field to left, pileus. Rev. Ε - Ρ /Υ - Θ Rosette of twelve petals; all within a shallow incuse square. BMFA 1839. Rosen, ACNAC 5, 576 (this coin). SNG Copenhagen 561. Well-centered and with a grey patina. Good very fine.
From the "Collection sans Pareille" of Ancient Greek Fractions, and from the collection of J. Rosen, Monnaies et Médailles 72, 6 October 1987, 272, ex Sotheby, Johannesburg, 20 April 1977, 186 and Kastner 4, 27 November 1973, 111.