The gold coin minted by the Persian Empire was named the daric. It’s purity was high quality and had a weight of around 8 grams. 
The Daric was first introduced by Darius I (522-486BC) at the end of the 6th century BC. Coining money for Persian Empire was a new concept, and they saw how prosperous it could be. Inspired by the Lydian system, the oldest in the world. The Persians would set a new trading standard for the next 250+ years. Their gold would circulated all over the ancient world as international currency. 
The Type IV Is the 3rd gold style produced and possibly the rarest by found today after the hoard of Type III’s were recently released. The Hero/King running into battle with a bow in his left hand, a dagger in his right, and wearing quiver on his back. 
This well-centered and detailed piece is at NGC and will be available by the end of the month.