Celtic. Gaul. The Coriosolites. Circa 75-50 BC. 
Billon Stater (23mm, 6.47 gm). 

Stylized male head right.
Horse and charioteer right; boar below. 

Seaby 14. 

From CNG e-Auction #66, closed 11 June 2003, re-used By permission of CNG, www.cngcoins.com.
CNG 66, Lot: 18.