Six commemoraitve postal covers originally issued by KNIGA, the Russian agency for foreign trade, featuring space-related cachets, 6.5 x 3.5, each signed in ink by a different cosmonaut: Gagarin, Titov, Nikolaev, Popovitch, Bykovsky, and Tereshkova. Accompanied by the original flyer from Sieger, the German distributor. According to the consignor, the covers represent the only commercial signing that Gagarin ever did. In very fine condition. COA Scott Cornish and R&R COA.