Mytilene, Lesbos. AE9, BI Trihemiobol ca 480-400 BC. 0.84 g.

Obv: Female head left. 
Rev: Head of lion right within incuse square. 

BMC 60-62; Hoover HGC 1095. 

With permission of Pecunem & Gitbud & Naumann - Auction 29, March 2015.
Estimate: 50 EUR.