The obverse features the antique (not medieval) bust of the emperor wearing a laureate wreath and the reverse features an eagle. Stylistically the coin is inspired by the aurei of ancient Rome. The coin weighed about 5.24 grams, which is 1/4 of a Sicilian gold ounce.
External link
An augustalis at the Kunsthistorisches Museum Vienna (http://www.khm.at/system2E.html?/staticE/page631.html)
The augustalis was a gold coin produced by the Holy Roman Emperor Frederick II beginning in 1231 at the Sicilianmints of Messina and Brindisi.
The name augustalis means literally "of the august one", referring to the coin's provenance from the Emperor himself, but also linking it with the Roman Emperor, who was commonly styled Augustus.
The Governor or Prefect of Egypt, in particular, was called Augustalis, or Praefectus Augustalis, as being first established by Augustus, after the defeat of Mark Anthony and Cleopatra.
The legend which states that a certain Cleon, who accompanied St. Lazarus to Gaul was the founder of the Church of Toulon, is based on an apocryphal document composed in the fourteenth century and ascribed to a sixth-century bishop named Didier.
Honoratus and Gratianus, according to the "Gallia Christiana" were the first bishops of Toulon whose names are known to history, but Duchesne gives Augustalis as the first historical bishop.
He assisted at councils in 441 and 442 and signed in 449 and 450 the letters addressed to Pope Leo I from the province of Arles.