1927 Sc 211 Red 8K surcharge on 1925 7K “Popov” Scott 353

1927. Red 8K surcharge on 1925 7K “Popov”.
Catalogs: Scott 353, Standard Collection 211, Michel 335.
Issued on: December 1, 1927.
Perforation: comb 13½.
Printing: Photogravure.
Surcharge: Typo, with space of 0.75mm between lines.
Face value: 8 Russian kopek.