1963 Sc 2738. Scientists of our Homeland. Scott 2712

1963. Scientists of our Homeland.
Catalog numbers: Scott 2712, Standard Collection 2738, Michel 2731, Yvert 2641.
Perforation: comb 12½ x 12.
Color: Brown, light-gray and light yellowy-brown.
Printing: Offset lithography.

Print run: 3,000,000.