1956 Sc 1834 Industrial engineering Scott 1856

1956. Industrial engineering.
Catalog numbers: Scott 1856, Standard Collection 1834, Michel 1892.
Issued on: October 22, 1956.
Perforation: line12½.
Printing: Photogravure.
Colors: Multicolor.
Face value: 60 Russian kopek.
Quantity: 5,000,000.