1962 Sc 2639-2641. A.G.Nikolayev and P.R.Popovich’s first-ever formation flying on the space ships «East-3» and «East-4». Scott 2627-2629

1962. A.G.Nikolayev and P.R.Popovich’s first-ever formation flying on the space ships «East-3» and «East-4».
Catalog numbers: Scott 2627-2629, Standard Collection 2639-2641, Michel 2634-2636, Yvert 2550-2552.
Perforation: comb 11½; frame 11½; comb 12½ x 12.
Color: Multicolor.
Printing: Photogravure. Offset lithography.

Print run: 5,000,000; 5,000,000; 4,500,000.