Musicpic: the search term kwe='helmets' results in 2 hits
1.
Hermann Gura (1870-1944).Bröstbild i profil, från ryggen, rollbild.
2.
Burgstaller, Alois (1871-1945).Midjebild, halvprofil, rollbild som Siegfried (Wagner) ; Half-length portrait of tenor Alois Burgstaller as Siegfried facing sideways
(1896-97)