Augustus AR denarius. 27 BC–AD 14. 19mm; 3.53g.
Lyons mint, struck 15 BC. 

AVGVSTVS DIVI F, bare head left.
IMP X beneath bull butting right, left forefoot raised.

BMCRE I 455; RIC 167b; RSC 139.

Rare. 
with permission of cngcoins.com, A.K. Collection.