1981 Sc 5099-5100 185 Days in Space of Cosmonauts Popov and Ryumin Scott 4919b

1981. 185 Days in Space of Cosmonauts Popov and Ryumin.
Catalogs: Scott 4919b, Standard Collection 5099-5100, Michel 5049-5050Zf.
Issued on: March 20, 1981.
Perforation: 12.
Printing: Offset lithography.
Format: Se-tenant.
Colors: Multicolor.
Face value: 4*15 Russian kopek.