Not my main area of collecting, but saw this rig at a local antique mall sitting in one of the cases tucked off in the corner and decided to take a chance on it. It is the rubber type covered with the cloth. I tried reading up on these on Google before buying and believe this to be a pre-WWII into WWII gas mask. Is that correct If this is WWII, would it be suitable for display with an M1917A1 Kelley helmet? Any help would be greatly appreciated. Thanks!