There is the suspicion that there may have been some ornamentation of copper layer because of the condition of the patina there.
The weight of the mask is given (Ref.3) as 361.4 g.
References:
Robinson, H.R. (1975), "The Armour of Imperial Rome", (Arms & Armour Press), p.122, Fig.138
Hanel, N., Rohnstock, U. & Willer, F. (2001-2); "Untersuchungen zu römischen Reiterhelmmasken in der Germania Inferior", J.R.M.E.S. 12/13, 9-13
Hanel, N., Peltz, U. & F. Willer, (2000) 'Untersuchungen zu römischen Reiterhelmmasken aus der Germania inferior'. Bonner Jahrbücher, 200, 244-45 & Abb.1-10
