Do we know what type of bird the wings on the helmets of the Gondorians is supposed to represent? As far as I know Tolkien only ever stated that they are representative
Did the Vikings Ever Wear Winged Helmets in Battle? - BaviPower Blog
Knight Marshal's Winged Helm
Winged Helmet - 3D model by Surforge (@Surforge) [10fe310]
Knight Winged Helmet Bead - 3D Print Model by alexkovalev