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Uncommon ‘air mail’ envelope with stamped cachet for the “National Air Tour to Ford Airport Oct. 21, 1929,” postmarked at Greenfield, Michigan on October 21, 1929, signed on the reverse in fountain pen, “A. Einstein.” The front of the envelope features an “Edison Celebration Light’s Golden Jubilee” stamp, an affixed 2¢ postage stamp, and 'golden jubilee' emblems, the latter of which are also present on the reverse, which also bears an affixed newspaper clipping related to Einstein’s congratulatory radio message to Thomas Edison. In fine condition. Encapsulated and graded by PSA/DNA as “NM-MT 8.”
On October 21, 1929, Henry Ford hosted Light's Golden Jubilee, an event celebrating the 50th anniversary of Edison's invention of the incandescent lamp. As part of the evening's program, guests listened to an account of Edison's re-enactment of the first successful lighting of his incandescent lamp as it took place in nearby Greenfield Village. Albert Einstein made congratulatory remarks via a radio broadcast from Germany, and Edison shared heartfelt remarks of appreciation. The night concluded with President Hoover formally dedicating The Edison Institute of Technology (Ford's village and museum complex in Dearborn, Michigan).
