1957 Sc 1968 Birth Centenary of K.E.Tsiolkovsky Scott 1991

1957. Birth Centenary of K.E.Tsiolkovsky.
Catalog numbers: Scott 1991, Standard Collection 1968, Michel 1993, Yvert 1966.
Issued on: October 7, 1957.
Perforation: comb 12 x 12½.
Printing: Offset lithography.
Size: 37 x 26 mm.
Color: Multicolor.
Face value: 40 Russian kopek.
Quantity: 2,000,000.