2 envelopes: one featuring a black-and-white photo of Presid - Lot 277

2 envelopes: one featuring a black-and-white photo of President Richard Nixon visiting Moscow for the signing of the space treaty for the Apollo-Soyuz mission (May 24, 1972), and the other featuring a black-and-white photo of the Soviet officials in charge of the ASTP flight arriving at the Marschall Space Center (Houston) on July 6, 1972. 16.5 cm × 9.5 cm, both postmarked on the day of the events in their respective countries. Apollo-Soyuz (ASTP for Apollo-Soyuz Test Project) was the very first joint space mission between the Soviet Union and the United States, which took place from July 15 to July 24 1975. On the American side, the crew consisted of astronauts Donald Slayton, Thomas Stafford, and Vance Brand. On the Russian side, astronauts Alexei Leonov and Valery Kubasov rounded out the crew.