Commemorative cover with a cachet honoring the International Astronautical Congress held in Athens, Greece, in September 1965, signed in ink by Voskhod 2 crewmen Pavel Belyayev and Alexei Leonov (both signing twice), Apollo 12 moonwalker Charles Conrad, Wernher von Braun, and Leonid Sedov. In fine condition. Consignor notes that the cover originates from the collection of Josip Kotnik, a Croatian electrical engineer and astronautics expert who published the book Čovjek u svemiru [Man in Space] in 1968. The cover bears a 1968 Kennedy Space Center postmark on the reverse, commemorating Kotnik's visit to the facility.
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