Chersonesos, Crete. ca 300-67 BC. AE17mm, 5.32 g. 

Helmeted head of Athena right.
XER beneath prow of galley left within circle of dots. 

Svoronos 30; SNG Cop 363. 
Very rare. 

Estimate: $100

With permission of cngcoins.com, Sept 2007.