Three Apollo-Soyuz launch day covers, postmarked at Kennedy Space Center on July 15, 1975, including: one signed by American astronauts Deke Slayton, Tom Stafford, and Vance Brand; one signed by Soviet cosmonaut Alexei Leonov; and one signed by Soviet cosmonaut Valeri Kubasov. In fine condition. Accompanying collector's notes indicate that these were signed between 1973 and 1975.
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