Iron.
A deep, rounded bowl, with vertical sides. This flares into a brim all around the helmet.
The neck guard is embossed with two semi-circular steps.
Just above the bowl is embossed an horizontal rib of triangular cross section.
The cheek piece hinges are attached by two rivets each, between the brim and the embossed rib.
Photo, (c) Sylvain Lamotte
References:
Robinson, H.R (1975), "The Armour of Imperial Rome", Arms & Armour Press, p.42-3, No.91
Schaaf, U., (1988), "Keltisch Helme" in Bottini, A. (Ed), "Antike Helme" (RGZM, Mainz), p. 302-3, Abb.16-18.
Coutil, L. (1912), "Le Casque d'Or Orné d'Emaux et le Casque en Fer de Notre-Dame-du-Vaudreuil. Etude Comparative des Casques Gaulois", (Paris), p.15, & Fig.12.
