With such small pics its really hard to tell.. and are you asking if the decal is original or the entire helmet? If its the entire helmet, take pictures of the inside close ups of the decals, and show us pics of every marking you find on the inside. I have little dount that the helmet itself is original.
I think it's ok, but closer shots of the flash would be better, if he does returns, just in case it's not right, then go for it.
Thanks for your comment Aaron
what would be a nice price for this?
They go anywhere from £70- £110, if it's the one pictured, & it's alright, a good condition one like that I'd pay £80.
But if you can get it cheaper go for it.