Attic type helmets are of Greek origin. They were manufactured primarily between the end of the 4th century and the first half of the 2nd century BC. These models were extremelly popular in Greece, but also in Macedonia, Thracia and into the Carthaginian army as well.
They were of course present in southern Italy, but the most exuberant models were found in Central Italy often adorned with feathers and bronze decorative wings.
The Romans in addition to their italic models, have certainly plundered a lot of beautiful copies during their many campaigns in Greece during the 2nd century BC.
This model will impose itself more and more among the officers to become one of their most famous symbols in its ultimate evolutions.
Represented on both frescoes and the lapidary, there are variants with a fixed central Crest. Some models are decorated very richly, or are covered with a silver leaf (they had to use this technique as they knew how to plate gold but not silver!).
This particular model is dated from the end of the third century BC or the beginning of the second. Discovered in Thrace it is not from a Greek manufacture (they had many pieces) and therefore may very well pass for a Thracian or a Roman model.