Attica, Athens, New Style. Tetradrachm; Attica, Athens, New Style; Two Monograms/Rudder; c.185/180-145 BC, Tetradrachm, 15.86g. Thompson-28, reverse die not illustrated. Obv: Helmeted head of Athena r. Rx: Owl standing r. on amphora, head front; ethnic and monograms l. and r., rudder below amphora; all within laurel wreath. Purchased from Gorny & Mosch, February 2016.Reverse softly struck. EF