Soviet cover about 1st anniversary of "Vostok 3" and "Vostok 4" flight on Aug.11-15,1962.
Cosmonauts Nikolayev and Popovich. 1st Group Flight.
Two official black postmarks at Vilnius on Aug.15,1963.
Nikolayev "Vostok 3" and Nikolayev "Vostok 4" postal stamp.
eBay -$3.50
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