LESBOS. MYTILENE. Ca. 454-427 BC.
EL Hecte ( Hekte ), 2.57 g., 10 mm.
Obv. Helmeted head of Athena right.
Rev. A pair of confronted female head, overlapping, within an incuse square.
NGC graded XF, Strike 4/5, Surface 3/5, a very popular type with an ancient optical illusion where a single eye serves for both female heads, forcing the viewer to focus on one or another at a time.