Silver roman or greek. Augustus? and??

[Corduba]

Here is a friend´s coin, I´m not be able to find.
It´s silver. It looks like a denarius. The weight is 2,7 gr. and the size is about 18 mm.
The observe? is augustus to me, but i can´t say who is the reverse? bust.

Best regards,
Ignacio.

[archivum]

Augustus / Rhoemetalces (Rhoimetalkes).

[Corduba]

Many thank´s

Ignacio.