1971 SC 3993-3996 Historical Buildings of Russia Scott 3910-3913

1971. Historical Buildings of Russia.
Catalog numbers: Scott 3910-3913, Standard Collection 3993-3996, Michel 3944-3947, Yvert 3780-3783.
Condition: MNHOG.
Issued on: November 16, 1971.
Perforation: comb 12 x 12¼.
Printing: Offset lithography.
Size: 37 x 52 mm.
Colors: Multicolor.
Face value: 3 Russian kopek; 4 Russian kopek; 6 Russian kopek; 10 Russian kopek.
Quantity: 4,700,000; 5,000,000; 4,200,000; 4,100,000.