The mask represents the face of a beardless youth.
The eye sockets and nostrils are pierced through the metal.
There are the remains of a leather strap beneath the buckle.
The mask was joined to the helmet skull by means of a hinge in the centre of the forhead.
References:
Benndorf, O. (1878), "Antike Gesichtshelmr und Sepulcralmasken", Denkshr. der philos.-hist. Classe der kaiserl. (Akad. d. Wissensch. Vienna), 28. 338f., Nr. 31, Taf. 14.3.