And I think this is the helmet the Surfer battalion wore - SUPER RARE - watch out for one of these guys!!
" When you're chewing on life's gristle, don't grumble, give a whistle "
Shame on you Gents ! a famous unit the 12th Jager Surfers Battalion, served on the Pacific front I believe....
Could also be from the Imperial German Navy's 1. Marine-Infanterie-Wellenreiter-Division based in Deutsch-Samoa.
The Wellenreiter Division! Of course!