Methymna, Lesbos, AR obol, ca 500-460 BC. 8 mm, 0.3 g.

Helmeted head of Athena left.
Tortoise within dotted square, all within incuse square. 

Hoover HGC (Islands) 890; Gokturk 53 in Anadolu 1998; Gokturk 64 in Anadolu 1994

With permission of Numismatik Naumann, auction 65, Lot 135, May 2018.