Watch List notes:

MYSIA. Lampsakos. Circa 500-450 BC. Diobol (Silver, 10 mm, 0.81 g, 3 h). Janiform female heads wearing circular earring. Rev. Head of Athena to left, wearing Corinthian helmet decorated with a wheel on the bowl; the whole within swallow incuse square. Baldwin, Lampsakos Group A, I, pl. V, 14-5. Cf. SNG Ashmolean 654-6 (without wheel on helmet). SNG BN 1128. Light porosity. Very fine.
From the collection of a scholar.