1961 SC 2556-2558. Youth on shock-work construction of the seven-year plan. Scott 2552-2554

1961. Youth on shock-work construction of the seven-year plan.
Catalog numbers: Scott 2552-2554, Standard Collection 2556-2558, Michel 2555-2556, 2569, Yvert 2481-2483.
Perforation: comb 12½; comb 12¼.

Colors: Light red-brown, dark blue-grey and red. Dark blue, brown and red. Light-brown, green-grey and red.
Printing: Offset lithography.

Print run: 2,500,000; 2,100,000; 2,000,000