Medical research in space.
The stamps were printed in sheets of 25 (5x5) and 8 (2x4) copies.
In sheets of 8 stamps issued on 100 thousand stamps of each denomination (within the total circulation). The series is dedicated to the flight of international crew consisting of commander, twice Hero of the Soviet Union, pilot-cosmonaut V. A. Dzhanibekov, flight engineer, twice Hero of the Soviet Union, pilot-cosmonaut of the USSR A. S. Ivanchenkov and cosmonaut-researcher, a citizen of the French Republic, Hero of the Soviet Union Jean-Loup chrétien on Board the spaceship "Soyuz T-6" (24.06.1982 - 02.07.1982).