Cosmonautics Day.
Stamp, USSR, 1978.
Kosmonautika päev.
NSV Liidu postmark, 1978.
День космонавтики.
Почтовая марка, СССР, 1978.
My collection.
* Cosmonautics Day – holiday celebrated in Russia and other former USSR countries on April 12.
* Soviet orbital space station Salyut 6, launched on 29 September 1977.
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