Six KNIGA covers, all with cachets commemorating Russian space achievements, issued and canceled to mark one of the first six Russian manned space missions, each signed in ink by one of the first six cosmonauts, including: Yuri Gagarin, German Titov, Andriyan Nikolayev, Pavel Popovich, Valery Bykovsky, and Valentina Tereshkova. In overall fine condition. A highly appealing, desirable set of these pioneering space explorers.
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