Desirable set of six KNIGA covers, all with cachets commemorating the Soviet space achievements of the Vostok program, issued and canceled to mark the first six Russian manned space missions. Each is signed in ink by one of the first six cosmonauts: Yuri Gagarin, Gherman Titov, Andriyan Nikolayev, Pavel Popovich, Valery Bykovsky, and Valentina Tereshkova. All bear small purple "H. W. Sieger" stamps to the lower right corner, an uncommon and desirable trait for KNIGA covers. In overall fine condition.
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