Watch List notes:

IONIA. Kolophon. Circa 530/25-500 BC. Obol (Silver, 9 mm, 0.81 g). Archaic head of Apollo to left. Rev. Quadripartite incuse square. Isegrim -. Cf. Rosen 386-7 (Tetartemorion). Cf. SNG Kayhan 342 (Hemiobol). Very fine.