1977 Sc 4639 Cosmonautics Day Scott 4562

1977. Cosmonautics Day.
Catalogs: Scott 4562, Standard Collection 4639, Michel 4589, Yt 4363.
Issued on: April 12, 1977.
Perforation: comb 12 x 11½.
Printing: Photogravure.
Size: 55.5 x 26 mm.
Colors: Multicolor.
Face value: 6 Russian kopek.
Print run: 6,600,000.