Six KNIGA covers, all with cachets commemorating Russian space achievements, issued and cancelled to mark one of the first six Russian manned space missions. Each signed in ink by one of the first six cosmonauts: Yuri Gagarin, Gherman Titov, Andrian Nikolayev, Pavel Popovich, Valery Bykovsky, and Valentina Tereshkova. In fine condition. Pre-certified Steve Zarelli and RR Auction COA.
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