Each is 13/16” litho with airplane or pilot against color background. Produced by Greenduck Co. in the 1930s and each button is numbered. Among the famous planes and pilots are Ford Tri-Motor, Douglas D.C.-2, Navy “Hell Diver”, Wiley Post, Wright Brothers Pusher Plane as well as portraits of Orville Wright, Glenn Curtiss, Eddie Rickenbacker, Charles Lindbergh, Frank Hawks, Jimmy Mattern, Roscoe Turner, Howard Hughes and the set concludes with five female pilots including Amelia Earhart Putnam. A wonderful set with all in NM to Mint condition. Our last set this nice reached $375.