1964 Sc 3046-3047. Big chemistry – for a national economy. Scott 2973-2974

1964. Big chemistry – for a national economy
Catalog numbers: Scott 2973-2974, Standard Collection 3046-3047, Michel 2993-2994, Yvert 2890-2891.
Perforation: comb 12¼ x 12
Color: Multicolor.
Printing: Photogravure.
Print run: 3,000,000.