This great looking pin is for the US Army Air Forces Training Service and is the Instructor's pin. This is a blue enameled on a safety pin back with the winged propeller. This pin has a gold colored backing with wear showing to the gold. The badge is 1 5/8" by 1 5/16". The badge is in a whole lot better shape than the photos show. This is the type worn by Civilian Instructors at the various training facilities around the country. The blue is in good condition.