Augustus. Apameia, Phrygia. 20.3mm/6.39grs. 

SEBASTOS, laureate head right.

GAIOS KAISAR GAIOS MASWNIOS ROUFOS APAMEWN, Gaius Caesar in 
facing quadriga. 

RPC 3129.  

The best example of this rare type I have seen!
   Price  £199

Courtesy of romeosromancoins.co.uk, Feb. 2010.