Watch List notes:

THRACO-MACEDONIAN TRIBES, Orreskioi. Circa 500-480 BC. Obol (Silver, 8 mm, 0.48 g). Forepart of a bull charging to right. Rev. Quadripartite incuse square. AMNG III, p. 90, 11 and pl. XVIII, 18. HGC 3, 1, 321. Very rare. Well-struck, sharp and clear. Extremely fine.
From the "Collection sans Pareille" of Ancient Greek Fractions, ex Tkalec, 26 March 1991, 57.