Hallo Gunther,
you need to know an original to learn from and not why a fake one is bad.
the liner is fake, the chinstrap is fake
the paint is fake, the decal is fake
the helmet shell is real, and there is a possibility the linerring is real, but cant see that here, but 99.9% chance it is fake too
signs you know it is a fake, :
wrong stiching, wrong construction, wrong kind of oxidation/rust,
wrong leather, wrong markings.
but a ND helmet and study and learn
Marc