ボストーク
A spacecraft of the design "Vostok 3KA" had only been launched once before, which was on March 9, 1961. This mission was called Korabl-Sputnik 4, and it was a complete success. Prior to Korabl-Sputnik 4, the two previous missions in the Vostok programme were both launched in December 1960, and both ended in failure.