Flown Soviet commemorative cover, 6.5 x 4.5, with a handsome color cachet honoring the Sputnik satellite, postmarked October 4, 1977, signed in Cyrillic in various ink types by the crews of Soyuz 26 and 27: Yuri Romanenko, Georgi Grechko, Vladimir Dzhanibekov, and Oleg Makarov. In fine condition.
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