Here’s the rough partial translation of Carnuntum Jahrbuch 2005, pp 122-123, written by Dr. Robert Fahr..
“As far as still being recognizable, it was originally an ordinary infantry helmet of the Weisenau / Imperial Gallic G-H type. Though some very exceptional modifications were made on that piece: It was completely lacking of all mounted parts (ornamental rivets, brow guard, cheek guards and so on). Only the remains of the rivets serving to attach the cheek guards and the brow guard were visible. The neck guard was cut off. The helmet’s bowl was rammed in the longitudinal direction. The material accrued by that treatment was folded/grooved in the area of the ear cut-outs.
The surface of the bowl was covered with a fur-like material. The rim was edged with an approx. 3 cm wired stripe of leather. Below this leather-stripe four tube-like remains of quills were found in the forehead area. A sure reconstruction of this undoubtedly highly exotic appearance of this helmet isn’t possibly any more. The helmet might have a nearly cap-like look when being deposited.”
Carnuntum Helmet, the production of DSC for Armamentaria, from a private collection that was displayed at Carnuntum recently. Unique in that it has a simple copper alloy bowl in the fashion of the Gallic ‘I’ but with none of the fancy bits such as embossed eyebrows, decorative rivet bosses and embossed steps on the occipital and neck guard. The only embellishment is a crest spike.
This is really unusual in that it has contrasting iron cheek guards with brass edging. The brass and iron combination it looks stunning, and really stand apart from the other Gallic and italic types out on the field.
(btw we have not adding the brass appliqué to the right cheek guard)
The helmet is dated to the late first century, but helmets of this type can be seen on Tropaeum Traiani (with a crest finial). The Gaillic and Italic styles of the first century were probably still in use toward the later second century.