WWI US M1917 Small Box Respirator Full Kit

World War One US M1917 Small Box Respirator – Full Kit. The respirator kit is in overall good condition. The canvas carry bag is intact and in good condition and has only suffered some deterioration and discoloration from age. On the inside of the top flap it is marked “S-18-22” and also has one marking that is faded and largely illegible. Contained in the carry bag is the gas mask, the canister/filter, and the instructions. The mask itself is in good condition and, though slightly hardened, is much more flexible than most original masks. The canister/filter has suffered some cracks and damage from rust over time. Attached to that canister/filter is the original instruction manual, however it has sustained some staining from rust as well.