Thrace, Abdera, c. 411-385 BC. AE10mm, 0.95g. 

Obv: Griffin seated left, right foreleg raised. 
Rev: EPI ...BIO..(K?) and thyrsos around lined square, with a 
dots in each section. 
Moushmov 2441 var (magistrate).

Green patina. Unpublished in the standard references.

courtesy of London Ancient Coins on deamoneta.com, Jun, 2012
auction 95, lot 72.
Another was offered at the Dix Noonan Webb auction in 
Sept. 2008, lot 5422, (unsold)
Note: The - on the left appears to be attached to the 
square object and is thicker than a letter I would be.
May, Mionnet, Moushmov etc. list a legend of EPI BOK (unbearded male head right / griffin left) (Moushmov
2440; Mionnet S2, 20), so IMHO it is possible that the 
reverse legend of this coin is EPI BO.. and not EPI BIO as 
described by the sellers.
Moushmov 2441 lists this coin but with the magistrate's
name EPI EPMOKLEYS.
Not listed in AMNG 184-195