1961 SC 2501-2503. All-Union sports day in technical sports. Scott 2497-2499

1961. All-Union sports day in technical sports.
Catalog numbers: Scott 2497-2499, Standard Collection 2501-2503, Michel 2503-2505, Yvert 2431-2433.
Perforation: Comb perf. 12½.

Colors: Black, grey-green and red. Dark blue-black and red. Dark blue-black and red.
Printing: Intaglio and offset. Comb perf. 12½.
Print run: 3,800,000; 3,100,000; 2,700,000.