Going by this pre-aged modern example, I would say reproduction.
" When you're chewing on life's gristle, don't grumble, give a whistle "
I looked at that decal but the black border on the decal on the helmet is thicker and the leg and the claws are different so I'm really unsure
I'm thinking its a NS shell because I seen this style eagle on those before
perhaps post the entire helmet and a better close-up, it's not an NS eagle. looks heavily touched up.