XXV Congress of Communist Party of the Soviet Union commemorative Cover flown aboard Soyuz-24 and Salyut-5 Space station February 1977 with cosmonauts Viktor Gorbatko and Yuri Glazkov for cosmonaut Vasiliy Lazarev(marked on reverse side).

Signed by Soyuz-24 crew and stamped with Salyut-5 board hand stamp.

In second space flight cover was taken by Soyuz TMA-2/ISS-7 cosmonaut Yuri Malenchenko.

Signed by Yuri and stamped with 3 ISS hand stamps.

Questions are welcome.