United States Army Air Service (USAAS) 25 mm caliber Mark IV Very pistol; Brass barrel and frame with a steel hammer and trigger and walnut grips; the mainspring is missing; a steel lanyard ring on the bottom of the grip. Created by Benjamin G. Sullivan Date Created 12/18/2018 Source Smithsonian's National Air and Space Museum Keywords Aviation; Equipment; World War I Rights and Restrictions Not determined
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