Pannonian Celts, Boii, Biatec, AR hexadrachm, mid to late  first century BC. 17.12 g. 

Bare-headed male head right.
BIATEC beneath rider, holding branch, on a hippogriff 
galloping right. 

Dembski 607; Goebl, Gross-Boier II/4.

With permission of H. D. Rauch GmbH auction 101, lot 1208, April 2016.