Watch List notes:

Greek Coins. Islands off Attica, Aegina.
Obol circa 510-485, AR 0.85 g. Sea-turtle. Rev. Irregular quadripartite incuse square. Milbank pl. I, 7. Rosen 214.
Old cabinet tone, obverse slightly off-centre, otherwise very fine

Ex Gorny & Mosch sale 196, 2011, 3220 (part of).