Watch List notes:

CYCLADES, Keos. Ioulis. Circa 515-490/80 BC. Obol (Silver, 8 mm, 0.88 g). Bunch of grapes; to left, but here off the flan, dolphin swimming upwards. Rev. Quadripartite incuse square. BMC p. 91, 28 ff (Karthaea). Papageorgiadou-Banis Seies I, 41-50. Sheedy 9. SNG Copenhagen 646. Rare and attractive. Struck slightly off center, otherwise, extremely fine.
From a Swiss collection, earlier in a German collection, Roma E-4, 28 December 2013, 138.