Watch List notes:

ISLANDS OFF THRACE, Thasos. Circa 412-404 BC. Hemiobol (Silver, 12 mm, 0.31 g, 6 h). Head of nymph to left, wearing a disc earring and with her hair bound up with a taenia. Rev. ΘΑ-Σ Dolphin swimming to left; all within incuse square. Le Rider, Thasiennes 13. SNG Copenhagen 1035. Rare. Toned and struck from well made dies. Surfaces slightly rough, otherwise, about extremely fine.
From the "Collection sans Pareille" of Ancient Greek Fractions, ex Auctiones 22, 16 June 1992, 172.