SPA115a - Russian FDC dedicated to the CCCP Space Program and signed by Vostok cosmonauts Lev Dyomin Soyus 15, d'cd 98 and Valentina Tereshkova.

Lev Stepanovich Dyomin (Russian: Лев Степанович Дёмин; January 11, 1926, in Moscow – December 18, 1998, in Zvyozdny Gorodok) was a Soviet cosmonaut who flew on the Soyuz 15 mission. Dyomin gained a doctoral degree in engineering from the Soviet Air Force Engineering Academy and the rank of Colonel in the Soviet Air Force. He only made a single spaceflight before resigning from the space programme in 1982 and taking up deep-sea research. He died of cancer in 1998.

Valentina Tereshkova - After the flight of Yuri Gagarin in 1961, Sergey Korolyov, the head Soviet rocket engineer, came up with the idea of putting a woman in space. On 16 February 1962, Valentina Tereshkova was selected to join the female cosmonaut corps. Out of more than four hundred applicants, five were selected: Tatyana Kuznetsova, Irina Solovyova, Zhanna Yerkina, Valentina Ponomareva, and Tereshkova. Qualifications included that they be parachutists under 30 years of age, under 170 cm tall, and under 70 kg in weight. Tereshkova was considered a particularly worthy candidate, partly due to her 'proletarian' background, and because her father, tank leader, sergeant Vladimir Tereshkov had died as a war hero in the Finnish Winter War during World War II in the Lemetti area in Finnish Karelia. Tereshkova was two years old at the time of her father's death. After her mission she was asked about how the Soviet Union should thank her for her service to the country. Tereshkova asked the state to search and publish the location where her father was killed in action. This was done and a monument is now standing at the site in Lemetti—now on the Russian side of the border. Tereshkova has since visited Finland several times. Training included weightless flights, isolation tests, centrifuge tests, rocket theory, spacecraft engineering, 120 parachute jumps and pilot training in MiG-15UTI jet fighters. The group spent several months in intensive training, concluding with examinations in November 1962, after which four remaining candidates were commissioned Junior Lieutenants in the Soviet Air Force. Tereshkova, Solovyeva and Ponomaryova were the leading candidates, and a joint mission profile was developed that would see two women launched into space, on solo Vostok flights on consecutive days in March or April 1963. Originally it was intended that Tereshkova would launch first in Vostok 5 while Ponomaryova would follow her into orbit in Vostok 6. However, this flight plan was altered in March 1963.[1] Vostok 5 would now carry a male cosmonaut Valery Bykovsky flying the joint mission with a woman aboard Vostok 6 in June 1963. The State Space Commission nominated Tereshkova to pilot Vostok 6 at their meeting on 21 May and this was confirmed by Nikita Khrushchev himself. At the time of her selection, Tereshkova was ten years younger than the youngest Mercury Seven astronaut, Gordon Cooper. After watching the successful launch of Vostok 5 on 14 June Tereshkova began final preparations for her own flight. On the morning of 16 June 1963, Tereshkova and her back-up Solovyeva were both dressed in spacesuits and taken to the launch pad by bus. After completing her communication and life support checks, she was sealed inside the Vostok. After a flawless countdown, two hours later Vostok 6 launched faultlessly, and Tereshkova became the first woman to fly into space. Her call sign in this flight was Chaika (English: Seagull; Russian: Ча́йка), commemorated in the asteroid name 1671 Chaika. Although Tereshkova was in the state of nausea and physical discomfort for much of the flight,[1] she orbited the earth 48 times and spent almost three days in space. With a single flight, she logged more flight time than the combined times of all American astronauts to that date. Tereshkova also maintained a flight log and took photographs of the horizon, which were later used to identify aerosol layers within the atmosphere. Vostok 6 was the final Vostok flight and was launched only two days after Vostok 5 which carried Valery Bykovsky into orbit for five days, landing only three hours after Tereshkova. The two vessels were at one point only 5 km apart and established a radio link. Even though there were plans for further female flights it took 19 years until the second woman, Svetlana Savitskaya, flew into space, with the pressure of impending American Space Shuttle flights with female astronauts. None of the other four in Tereshkova's cosmonaut group ever flew.