Salyut 6 Soyuz 29 -Soyuz 31 Flown Space Cover signed by Soyuz 29 crew Aleksandr ivanchenkov and Viktor Kovalyonok and Soyuz 31 crew: Sigmund Jähn and Valery Bykovsky. 

Excellent condition.

Valery Bykovsky (1934 – 2019) was a Soviet cosmonaut who flew on three space flights: Vostok 5, Soyuz 22, Soyuz 31. He was also backup for Vostok 3 and Soyuz 37 He flew Soyuz 31 mission to Salyut 6 space station with the East German Sigmund Jähn. It was launched on 26 August 1978. They joined two other cosmonauts V. Kovalyonok and A. Ivanchenkov on the space station that had arrived on Soyuz 29. The four conducted biological experiments on themselves during their stay. Bykovsky and Jähn undocked from the station in the Soyuz 29 capsule on 3 September and landed back on Earth later that day.

Sigmund Jähn (1937 –2019) was a German cosmonaut and pilot who in 1978 became the first German to fly into space as part of the Soviet Union's Interkosmos program.

Soyuz 29 was the fifth mission, the fourth successful docking, and the second long-duration crew for the orbiting station. Commander Vladimir Kovalyonok and flight engineer Aleksandr Ivanchenkov established a new space-endurance record of 139 days. The crew returned on board Soyuz 31, which had been swapped by a crew launched in August who returned in Soyuz 29. The second long-duration mission to Salyut 6 was launched into orbit on 15 June 1978. The space station had been vacant for three months since the record-breaking mission of Soyuz 26 ended after 96 days. The crew successfully docked on 17 June and Kovalyonok and Ivanchenkov reactivated the station. Kovalyonok, who was aboard the failed Soyuz 25 mission to Salyut 6, became the first person to visit the same station twice. They switched on the station's air regenerators and thermal regulation system, and activated the water recycling system to reprocess water left aboard by Soyuz 26. De-mothballing Salyut 6 occurred simultaneously with the crew's adaptation to weightlessness, and required about one week. Cosmonauts V. Kovalyonok and A. Ivanchenkov performed maintenance on the station's airlock, installed equipment they brought with them in Soyuz 29's orbital module, and tested the station's Kaskad orientation system.

Vladimir Kovalyonok (1942) is a retired Soviet cosmonaut. He entered the Soviet space program on July 5, 1967 and was commander of three missions Soyuz 25, Soyuz 29, Soyuz T-4. He retired from the cosmonaut team on June 23, 1984. From 1990 to 1992 he was a Director of the 30th Scientific Research Institute, Ministry of Defense.

Aleksandr Ivanchenkov (1940) is a retired Soviet cosmonaut who flew as Flight Engineer on Soyuz 29 and Soyuz T-6, he spent 147 days, 12 hours and 37 minutes in space.