Attica. Athens. Silver Tetradrachm (17.12g), ca. 440-404 BC. Helmeted head of Athena right, frontal eye; small incuse square countermark on cheek. Reverse: AΘE, owl standing right, head facing; above to left, olive-spray with berry and crescent; all within incuse square. Two ancient test cuts, one across neck of owl the other across the head. NGC graded Choice XF; Strike: 5/5, Surface: 2/5. Estimated Value $350 - UP