This gas mask was made for the Belgian army in 1918, it is composed by a German lederschutzmasken, it was equipped with a French filter and a French storage case.
these are sometimes referred to incorrectly as ARS gas mask, as this is mentioned in the instructions on the tube. official name is respirator model in 1918.
End 1917, the French army had captured a depot of the German army, they found herein 18 000 pieces gas masks,
these were shipped to England, and there converted to this end result.