Collection of six KNIGA covers with cachets commemorating Russian space achievements, individually signed in ink by the first six cosmonauts, including: Yuri Gagarin, German Titov, Andriyan Nikolayev, Pavel Popovich, Valery Bykovsky, and Valentina Tereshkova. In overall fine condition. Accompanied by a letter of authenticity from KNIGA, the Russian philatelic department. A fine collection not often found with the associated letter.
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