Second magistrate attested in Athens in 138/137 BC [issue 27]. Then attested as third magistrate in 136/135 BC [issue 29].
ΕΧΕ is probably Echedemos, from Kydathenaion: See M. Thompson, The New Style Silver Coinage of Athens (1961) nos. 287-314
and nos. 335-336 / issues 27 and 29, commentary on p. 566; C. Habicht, Zu den Münzmagistraten der Silberprägung des Neuen
Stils, Chiron 21, 1991, p. 5 (138/137 and 136/135 BC); Prosopographia Attica 6168; W. Leschhorn, Lexikon der Aufschriften
auf griechischen Münzen II (2009) p. 514 s. v. Eche-.