Intercisa helmets - photos

[Flavivs Aetivs]

Metal. Horsehair is standing on weak base, especially in late roman times.

Not really. Lots of Horsehair crests in artistic representation. Besides, I seriously doubt that when you have whole examples of the metal surviving like the Augst Helmet, that the metal Crest wouldn't. An iron metal crest would have survived in that example, so it must have used a horsehair or feather crest with a wooden crest box