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Scarce commemorative cover with a pictorial cachet honoring the 40th anniversary of the Berlin Rocket Airfield and its testing of the first liquid rocket in 1930, which pictures famed rocket scientists Wernher von Braun, Hermann Oberth, Rudolf Nebel, and Walter Riedel, postmarked on February 14, 1970, signed in black ballpoint by von Braun, Oberth, Nebel, and Ernst Engel. In fine condition. Accompanied by a full letter of authenticity from Zarelli Space Authentication.
Wernher von Braun was a German-American aerospace engineer (1912–1977) who led the development of the V-2 rocket and later became a chief architect of NASA’s Saturn V moon rocket.
Hermann Oberth was an Austro–Hungarian–born physicist (1894–1989) whose theoretical work laid the scientific foundations of modern astronautics.
Rudolf Nebel (1894–1978) was a German rocketry advocate and co-founder of early amateur rocket groups that advanced experimental liquid-fuel rockets in the 1920s–30s.
Ernst Engel was an early German rocketry experimenter (1900–1947) associated with the pioneering rocket work at Raketenflugplatz Berlin during the formative years of astronautics.
