Watch List notes:

Islands off Ionia, Chios. Electrum Stater (14.11 g), ca. 525-510 BC. Sphinx seated right on dotted ground line. Reverse: Incuse square punch. Baldwin 1; Mavrogordato 3. Well centered on a nice round planchet. Lovely strike for the type. Extremely Rare. Delicately toned. Choice Very Fine.

Nicholas Hardwick cites just eighteen specimens of this rare coinage (see Proceedings of the 11th International Numismatic Congress, September 8-13, 1991, I, pp. 211-22).
Estimated Value $30,000-UP.
Ex NFA.