WWI US M1917 US ARMY SBR GAS MASK & CARRY BAG. This bag is based on the British WW1 gas mask bag the main difference between the British and American bag is the closing snap buckles on the front, the British one has press studs and the American has lift the dots. Includes the heavy wire spacer spring that ensured proper airflow around the filter box. CE stands for Corrected English. When the US Army first entered World War One, they did not have any gas masks so they issued the French M2 gasmask but they quickly found they needed something better so by 1918 they where issued the British SBR (Small Box Respirator).BRAND NEW MUSEUM GRADE REPRODUCTION. This item is in the category "Collectibles\Militaria\WW I (1914-18)\Reproductions\United States". The seller is "luckyline1945" and is located in this country: US. This item can be shipped worldwide.