Mask is in nice condition. It is missing the canister. Eyes are cracked, but you could get them replaced, if you wanted to go steampunk with this. It comes with carry pouch. This is one of the many items I picked up on my last trip to Japan.
The use of chemical weapons during war saw its birth in WWI. By the time WWII started, every army had a gas mask designed and issued in preparation for chemical warfare.
Most of the masks around the world had the same basic design.