Commemorative 1928 AirMail postcard that has rare signature of historic aviator For Sale

Charles A Lindbergh signed this card with his nickname which he only used in addressing close friends and fellow aviators. Lindbergh (1902-1974) was in his mid-twenties when he worked for Robertson Aircraft Corporation (later it became American Airlines) based in St. Louis Missouri, first as a flight instructor and later in 1926-28 delivering Airmail under contract with the US Post Office. This postcard not only commemorates his final Airmail flight but has his rarest autograph 'Lindy' as well. Adult signature required at delivery,thank you.