Commemorative cover with a cachet honoring rocket technology, signed in various inks by 17 early cosmonauts, including Valery Bykovsky, Anatoly Filipchenko, Yevgeni Khrunov, Valeri Kubasov, Alexei Leonov, Andriyan Nikolayev, Pavel Popovich, Vitaly Sevastyanov, Georgi Shonin, Valentina Tereshkova, Gherman Titov, Vladislav Volkov, Boris Volynov, and Boris Yegorov. In fine condition. Pre-certified Steve Zarelli and RR Auction COA.
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