Watch List notes:

LESBOS. Methymna. Circa 500/480-460 BC. Diobol (Silver, 11 mm, 1.41 g, 11 h). Gorgoneion facing, with outstretched tongue and snaky hair. Rev. Head of Athena to left, wearing Corinthian helmet; partially enclosed by a border of dots and all within an incuse square. Franke 5. Pozzi 2339 = SNG Lockett 2778 (this coin). Traité II, 1, 620 and pl. XV, 21. Toned. Obverse struck with a slightly worn die, otherwise, good very fine.
From the "Collection sans Pareille" of Ancient Greek Fractions and from the collections of R. C. Lockett, IV, Glendining & Co., 21 February 1961, 2249, and S. Pozzi, Naville I, 4 April 1921, 2339.