1966 Sc 3252-3254 Soviet Scientists Scott 3189-3191

1966. Soviet Scientists.
Catalog numbers: Scott 3189-3191, Standard Collection 3252-3254, Michel 3201-3203, Yvert 3080-3082.
Condition: MNHOG.
Issued on: March 30, 1966.
Perforation: comb 12½ x 12.
Printing: Offset lithography.
Size: 26 x 37 mm.
Colors: Multicolor.
Face value: 3*4 Russian kopek.
Quantity: 2,000,000; 2,000,000; 2,000,000.