1972 Sc 4046-4048 Cosmonautics Day Scott 3962-3964

1972. Cosmonautics Day.
Catalogs: Scott 3962-3964, Standard Collection 4046-4048, Mi 3996-3998, Yt 3825-3827.
Condition: MNHOG.
Issued on: April 5, 1972.
Perforation: comb 11½ x 12.
Printing: Photogravure.
Size: 52 x 37 mm.
Colors: Multicolor.
Face value: 6 Russian kopek; 6 Russian kopek; 16 Russian kopek.
Quantity: 4,100,000; 4,000,000; 3,600,000.