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Apollo - Soyuz  (Art.-No.: 10194 ) 

Two FDC, signed by all five 
 
Product description:
The first cover is signed by US-AstronautsTom Stafford, Deke Slayton and Vance Brand (2x) and the second letter is signed by russian cosmonauts Alexei Leonov and Valerie Kubassov 
(click on the picture to get back)
 Apollo - Soyuz