A British early model Service gas mask with accompanying carrying case. The gas mask is stamped 6/42 and has the factory mark BTR 8/41 and the size designation NORMAL. The exhaust filter is stamped WW 41 . The orange filter canister is AT 821/9/42 with the BROAD ARROW. The carrying case is from W&G 1932 Ltd with year stamp 1941 and Broad Arrow 43.