1941 Sc 688 Technics & industry Scott 818

1941. Technics & industry.
Catalog numbers: Scott 818, Standard Collection 688, Michel 787A.
Issued on: January, 1941.
Perforation: comb12½ x 12.
Printing: Photogravure.
Colors: Multicolor.
Face value: 15 Russian kopek.
Quantity: 2,000,000.