1970 SC 3783-3785 World Fair “EXPO-70” Scott 3706-3708

1970. World Fair “EXPO-70”.
Catalog numbers: Scott 3706-3708, Standard Collection 3783-3785, Michel 3734-3736, Yvert 3590-3592.
Condition: MNHOG.
Issued on: March 10, 1970.
Perforation: comb 11½.
Printing: Photogravure.
Size: 28 x 40 mm.
Colors: Multicolor.
Face value: 4 Russian kopek; 6 Russian kopek; 10 Russian kopek.
Quantity: 5,000,000; 5,000,000; 5,000,000.