 When the last Wittnauer brother died in 1916, Martha Wittnauer became the first woman watchmaker CEO.During World War I Wittnauer produced instruments and watches for the early aviation units.The most famous model was probably the Wittnauer AllProof, produced for the first time in 1918, and one of the first all proof models ever used by daredevill Jimmie Mattern in his 1933 attempt to fly around the world in his Vega 5B, "Old Cromwell", and by Neil Armstrong during the Gemini 8 mission.