Lt. Russell Maughan removed this 139th Aero Squadron "Mercury" insignia from the side of the Spad 13 he flew during World War I. Maughan achieved four aerial victories in this aircraft and saved this insignia as a souvenir before the aircraft was destroyed after the Armistice at Colemey-Les Belles, France.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.