1978 Sc 4785-4787 Soviet-Polish Space Flight Scott 4670-4672

1978. Soviet-Polish Space Flight.
Catalog numbers: Scott 4670-4672, Standard Collection 4785-4787, Michel 4735-4737, Yvert 4494-4496.
Condition: MNHOG.
Issued on: June 30, 1978.
Perforation: comb 12¼ x 12.
Printing: Offset lithography.
Size: 52 x 37.5 mm.
Colors: Multicolor.
Face value: 6 Russian kopek; 15 Russian kopek; 32 Russian kopek.
Quantity: 6,800,000; 5,400,000; 4,400,000.