Methymna, Lesbos. AR hemiobol. ca 450-406 BC. 8 mm, 0.41 g.

Facing head of Silenos.
Tortoise within linear circle. 

Traité II-2 2263; Hoover HGC 901; Goektürk 62 in Anadolou Vol. 1994. 

With permission of Numismatik Naumann auction 78, Lot 215, June 2019