Watch List notes:

IONIA, Ephesos. Circa 390-325 BC. AR Tetradrachm (22mm, 15.32 g, 1h). Contemporary imitation. Dion, magistrate. Bee / Forepart of stag right, head left; palm tree to left, [ΔIΩN to right]. Unpublished in the standard references, but see CNG E-403, lot 180 for another from the same dies. Near VF, off center.

There are no known official issues from Ephesos known with a magistrate named Dion.