1961 SC 2519-2522. 40th anniversary of the Soviet postage stamp. Scott 2516-2519

1961. To the 40th anniversary of the Soviet postage stamp.
Catalog numbers: Scott 2516-2519, Standard Collection 2519-2522, Michel 2517A-2520A, Yvert 2448-2451.
Perforation: Comb 12¼ x 12.

Colors: Multi-color.
Printing: Offset lithography.

Print run: 3,000,000; 2,500,000; 2,500,000; 2,200,000.