Watch List notes:

ATTICA. Athens. Circa 545-525/15 BC. Obol (Silver, 8 mm, 0.61 g), from the so-called Wappenmünzen series. Wheel of four spokes. Rev. Quadripartite incuse square. HGC 4, 1653 (but illustrated by the type of 1654). Seltman pl. IV, ρ. SNG Soutzos 654. Svoronos pl. I, 54-6. Boldly struck and with a dark patina as found. Some light earthen deposits, otherwise, good very fine.
From the "Collection sans Pareille" of Ancient Greek Fractions.