Watch List notes:

IONIA. Magnesia ad Maeandrum. Circa 450-420s BC. Hemiobol (Silver, 7 mm, 0.36 g, 12 h). ΘΕ - Ε Sprouting barley grain. Rev. Μ - [Α/Γ - Ν] Head of Apollo to right, wearing taenia. Sheedy, Clarke Studies Ma. D 5 (O5/R5) = Nollé & Wenninger Th.5c (this coin). Very rare. Clear and well-centered. Rough surfaces, reverse slightly double-struck, otherwise, good very fine.
From the "Collection sans Pareille" of Ancient Greek Fractions, ex Hauck & Aufhäuser 14, 6 October 1998, 165.

The The-E on this coin refers not to the famous Themistocles but, more probably, to one of his descendants; perhaps a son of Archepolis.