Gold Augustus Bull

I would want clearer pictures to look for signs of casting. I am not an expert by any means, but the coin details look very soft.

I'm not looking to buy it. Bit out of my price range. Someone just asked to look in my books to ID it and I couldn't find an exact match and was hoping someone else would know. The older gentleman who has it inherited it from a family member.

Ancient Greek and Roman gold coins have quite a high purity, typically around 95%.
Gold is a very soft metal.
I find it very hard to believe that the large volume of ancient Greek and Roman gold coins without provenance, that have been available for sale over the last 30 years or so, are all genuine.

If an ancient gold coin in top condition has come out of a hoard, then it is essential that that provable evidence should be provided by the seller.

Fake ancient gold coins are most often faked in good quality gold.
It is very easy to degrade gold coins to a lesser grade, but
it is also very tempting to offer an ancient (fake?) gold coin in a superior grade at a much higher price.

I would need to have to take a close look at this coin 'in hand' to satisfy myself, then take it to someone experienced, with an internationally regarded reputation, to confirm my own opinion or otherwise.

XRF testing can easily pick if a suspect coin has been made out of modern coin gold or pure gold, by looking for the other 5% of trace metals, and their relative concentration to each other.