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Rocket Mail of the WorldAustriaWein (Vienna), Austria %u2014 August 25, 1959 %u2014 EZ-34D1.Souvenir cover commemorating the U.S. Regulus missile Rocket Mail launch. Backstamped Vienna, August 8, 1959. Not flown.(postmark) Special airmail Vienna to Cologne.(cachet) To commemorate the world's first official rocket mail delivery.
