1968 SC 3595-3600 Soviet Nature Reserves Scott 3517-3522

1968. Soviet Nature Reserves.
Catalog numbers: Scott 3517-3522, Standard Collection 3595-3600, Michel 3545-3550, Yvert 3417-3420.
Condition: MNHOG.
Issued on: October 16, 1968.
Perforation: comb 12½ x 12.
Printing: Offset lithography.
Size: 42 x 30 mm.
Colors: Multicolor.
Face value: 4 Russian kopek; 4 Russian kopek; 6 Russian kopek; 6 Russian kopek; 10 Russian kopek; 10 Russian kopek.
Quantity: 4,000,000; 4,000,000; 3,000,000; 3,000,000; 3,000,000; 3,000,000.