Gas mask bag that is named with what it likely also the service number. Im hoping this will point us towards whether all these pieces are together or if the helmet was added to a random kit in the interwar period.
Corporal A. B. Barnes 1347-67...maybe. I plan to get this in proper daylight and use a filter to see if I can bring it out better.
The large spring was in the gas mask bag. I will likely post that under the "what is it" section of US Militaria as well as here and gunboards.