1981 Sc 5099-5100 185 Days in Space of Cosmonauts Popov and Ryumin Scott 4918-4919

1981. 185 Days in Space of Cosmonauts Popov and Ryumin.
Catalogs: Scott 4918-4919, Standard Collection 5099-5100, Michel 5049-5050, Yt 4786-4787.
Issued on: March 20, 1981.
Perforation: 12.
Printing: Offset lithography.
Size: 37 x 52 mm.
Colors: Multicolor.
Face value: 2*15 Russian kopek.
Quantity: 4,500,000.