1965 Sc 3127 20th International Congress of Pure and Applied Chemistry Scott 3056

1965. 20th International Congress of Pure and Applied Chemistry.
Catalog numbers: Scott 3056, Standard Collection 3127, Michel 3079, Yvert 2971.
Condition: MNHOG.
Issued on: June 15, 1965.
Perforation: comb 11½.
Printing: Photogravure.
Size: 40 x 28 mm.
Colors: Multicolor.
Face value: 4 Russian kopek.
Quantity: 4,000,000.