When found, this helmet was in many pieces, some 15 fragments were recovered. These were in three groups, viz (a) from the helmet bowl, (b) from the crest and (c) a 'chi-rho' badge. The photograph here shows the helmet as 'restored', where the dark grey areas are the missing pieces.
There were ten gold coins recovered from the site (solidi). These ranged from the reign of the emperor Valens (AD 364-7) to that of the emperor Constantinus III (AD 408-11).
The various components are fixed together by means of rivets. These may also have been plated, either with gold, or silver or both.
In the front of the ridge on the helmet there is a small applied piece of metal that carries the "chi-rho" Christian symbol. This appears to have been silver plated.
References:
Prins, J. (2000), "The fortune of a late Roman officer. A hoard from the Meuse valley (Netherlands) with helmet and gold coins", Bonner Jahrbücher, 200, 309-328