1934 Sikorsky S-42 Record-Setting Test Flight. Pristine unaddressed legal size airmail cover franked with 6¢ Winged Globe tied by "Bridgeport, Conn., Aug 1, 1934" machine cancel, central flight cachet and pilot signatures C.A. Lindbergh - Aug 1, 1934, Boris Sergeievsky and Edwin C. Musick, Extremely Fine, a choice historical flight cover signed by aviation legend Charles A. Lindbergh, this one test flight broke eight different world flight records. AAMC No. 686. Estimate  $1,000 - 1,500. $0 (Image)