Watch List notes:

ATTICA. Athens. Circa 545-525/15 BC. Obol (Silver, 8 mm, 0.58 g), from the so-called Wappenmünzen series. Bull's head facing. Rev. Irregular incuse square. HGC 4, 1652. Svoronos pl. 1, 45. Very rare. Attractive old toning with light iridescence. Boldly struck and well-centered. Some deposits on the reverse, otherwise, about extremely fine.
From the "Collection sans Pareille" of Ancient Greek Fractions and from the collection of L. Mildenberg, received as a gift from Franco Chiesa in the early 1960s.