1961 SC 2533-2537. XXII Congress of the CPSU. Scott 2524-2528

1961. XXII Congress of the CPSU.
Catalog numbers: Scott 2524-2528, Standard Collection 2533-2537, Michel 2531-2535, Yvert 2458-2462.
Perforation: comb 12½ x 12; comb 12¼ x 12.
Color: Multi-color.
Printing: Offset lithography.

Print run: 5,000,000; 3,000,000; 3,000,000; 3,000,000; 5,000,000.