1977 SC 4664-4670 National icebreaker fleet Scott 4579-4585

1977. National icebreaker fleet.
Catalog numbers: Scott 4579-4585, Standard Collection 4664-4670, Michel 4614-4620, Yvert 4386-4392.
Condition: MNHOG.
Issued on: July 27, 1977.
Perforation: comb 12¼ x 12.
Printing: Offset lithography and Recess.
Size: 52 x 37 mm.
Colors: Multicolor.
Face value: 4 Russian kopek; 6 Russian kopek; 10 Russian kopek; 12 Russian kopek; 14 Russian kopek; 16 Russian kopek; 20 Russian kopek.
Quantity: 7,500,000; 6,900,000; 6,200,000; 6,000,000; 4,200,000; 4,000,000; 3,800,000.