Watch List notes:

CYCLADES, Keos. Ioulis. Circa 515-490/80 BC. Obol (Silver, 9 mm, 1.03 g). Grape cluster with five grapes; on the left, dolphin swimming upwards. Rev. Millsail pattern quadripartite incuse square. Papageorgiadou-Banis 9. Sheedy 9 (O8/R9 j, this coin). SNG Copenhagen 648. Traité II, 1, 1903 and pl. LX, 26. Rare. Nicely toned. Some old scrapes and marks, otherwise, very fine.
From the "Collection sans Pareille" of Ancient Greek Fractions, and from the collection of Serge Boutin, Monnaies et Médailles 76, 19 September 1991, 721.