Watch List notes:

MACEDON. Neapolis. Circa 500-480 BC. Obol (Silver, 9.5 mm, 0.92 g). Facing gorgoneion with protruding tongue. Rev. Quadripartite incuse square. Rosen 381. SNG ANS 423. Traité II, 1, 1742. Weber 1806. With a powerful and frightening head of a gorgon, nicely toned. Slightly rough surfaces as usual, otherwise, nearly extremely fine.
From the "Collection sans Pareille" of Ancient Greek Fractions, ex Sternberg XIV, 24 May 1984, 62 and Monnaies et Médailles XXVIII, 19 June 1964, 105.