Attica, Athens, New Style. Tetradrachm; Attica, Athens, New Style; Two Monograms/Cicada; c.185/180-145 BC, Tetradrachm, 16.56g. Thompson-65, reverse die not illustrated. Obv: Helmeted head of Athena r. Rx: Owl standing r. on amphora, head front; ethnic and monograms l. and r., cicada in lower l. field; all within olive wreath. Purchased from Aeternitas, January 2015.. EF