3.5" with slogan "I Gave To Restore The Charles A. Lindbergh Car/Little Falls, Minn." Pictured is battered 1920s era vehicle with sign board propped on top "Capt. Lindbergh's First Gear Shift Auto Motive Machine" while in white paint hand-lettered on the car's side is "Lindbergh's First Plane." Button seems to date from the 1960s and curl has name of Minnesota company "Continental Press, Inc." of St. Cloud. Single tiny bump center right caused by bar pin on reverse. Some scattered but very light hairline scratches will catch reflected light. Metal back has a little tarnish to the silver finish. Overall VF but still displaying essentially Mint under normal viewing. Only example we've seen.