WWI vintage US issued “Corrected English Box Respirator” model as issued to American Expeditionary Forces in France 1918. Bag is dated 1918 and has hand written identification of soldier: Pvt. Charley Rider 337, Field, A, Med. My guess is the 337th Infantry Regiment, which had a Medical Detachment. The “Field, A” is a mystery, as there is no Field Artillery unit associated with the 337th Infantry, perhaps the A refers to a company, in which case the field meaning is unknown. The letters preceding “France” are a similar mystery, as they do not clearly indicate a town or department. I have researched the soldier and potential units for hours without a concrete answer as to who this particular doughboy was, or where he was stationed in France. The unit served to replace losses in other units and did not enter the trenches together as a unit. This particular soldier could have started with the 337th and then have been transferred to another unit to serve. See condition description for more details, as well as the photos. I attempted to show to item as faithfully and comprehensively as I could without compromising the condition of the mask. If you have any additional questions or would like any more information please contact me. This item is in the category “Collectibles\Militaria\WW I (1914-18)\Original Period Items\United States\Personal, Field Gear”. The seller is “thehiddentriumph” and is located in this country: US. This item can be shipped to United States.