The mask is iron and bronze but there is the remains of a rolled up iron mail coat inside at the back.
When originally discovered, there may have been a laurel crown around the brow but this has since vanished.
The left ear and eye region has been heavily damaged by oxidation of the metal.
There is a bronze rivet fixed below the right ear, which would have once held a strap to fasten the helmet closed. On the left hand side only the shaft of the corresponding rivet remains.
References:
Robinson, H.R. (1975), “The Armour of Imperial Rome”, (Arms & Armour Press), p.118, Nos.337-8.
Beck, F. & Chew, H. (1991), "Masques de Fer. Un officer romain du temps de Caligula", Editions de la Réunion des musées nationaux, (Paris).
