Very rare commemorative cover with a cachet honoring Hermann Oberth, signed in various ink types by ten of the world's pioneering rocket leaders, including: Wernher von Braun, Hermann Oberth, Irene Sanger-Bredt, Walter Dornberger, Ernst Stuhlinger, Rudolf Nebel, Gerhard Zucker, Karl Poggensee, Kurt H. Debus, and Albert Pullenberg. In fine condition. From the collection of aerospace memorabilia specialist Ken Havekotte.
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