1975 Apollo 10c Stamp Sheet (unused)

sheet of 16 unused 10c US Stamps On July 15, 1975, the U.S. and Soviet Union each issued stamps honoring the launch of their Apollo-Soyuz Test Project, their first joint space venture. After several years of tension and a Space Race to the Moon, the United States and Soviet Union began to adopt a détente policy. This was an easing of strained relations. Out of this policy came the Apollo-Soyuz Test Project.