1975 Sc 4405. International Stamp Exhibition “Socphilex-75”. Scott 4322

1975. International Stamp Exhibition “Socphilex-75”.
Catalogs: Scott 4322, Standard Collection 4405, Michel 4355, Yt 4143.
Issued on: 1975-04-25.
Perforation: comb 12 x 12¼
Printing: Offset lithography
Size: 30 x 42 mm
Colors: Multicolor
Face value: 6 Russian kopek
Print run: 4,400,000