That is the khil, the classic Yan Koryani helmet style. It is superficially similar looking but not actually the same construction at all. The Sea People helmets have a fringe of horsehair or feathers (per one Osprey cover). The Khil, on the other hand, is a conical helm, often with a central spike onto which the plume is attached. A rim of fluted vertical plates runs around the side, often lacquered in alternating colours. The may or may not be a plate on top (my figures all have a plate for ease in casting). Sometimes there is a crest in place of the plume. The fluted plates can vary in height from one helmet to another. The face of the helm can vary as well, some having a sort of beaked front piece.