1967 SC 3401. All-Union Exhibition “50th Anniversary of October”. Scott 3331

1967. All-Union Exhibition “50th Anniversary of October”.
Catalogs: Scott 3331, Standard Collection 3401, Michel 3351, Yt 3232.
Issued on: 1967-05-25.
Perforation: comb 11½
Printing: Photogravure
Size: 80 x 28 mm
Colors: Multicolor
Face value: 20 Russian kopek
Print run: 4,000,000