Description:Christy Mathewson's personal WWI Chemical Corps Collar insignia with his 1918 "Gas Defense School" bunk assignment document. Original pressed metal collar insignia pin from Christy Mathewson's personal effects display appropriate use/wear; Paper form (5"x8") has handwritten notations added in appropriate areas assigning "Christopher Mathewson" to his bed and billet. Light general handling wear and there is a small tear along the bottom. Includes Mathewson Collection certificate of provenance: GD-EX