1979 Sc 4956-4961. Scientific research fleet of USSR. Scott 4799-4804

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1979. Scientific research fleet of USSR.
Catalogs: Scott 4799-4804, Standard Collection 4956-4961, Michel 4906-4911, Yt 4652-4657.
Issued on: 1979-12-25.
Perforation: comb 12 x 11½
Printing: Photogravure and Recess
Size: 55.5 x 26 mm
Colors: Multicolor
Face value: 1 Russian kopek; 2 Russian kopek; 4 Russian kopek; 6 Russian kopek; 10 Russian kopek; 15 Russian kopek.
Print run: 8,200,000; 7,900,000; 7,700,000; 6,900,000; 5,200,000; 4,900,000