1927 Sc O213 Black 8K surcharge on 1925 7K “1905” Scott 355

1927. Black 8K surcharge on 1925 7K “1905. This stamp had never been in normal postal circulation, but was sold at philatelic stores, also exist with CTO cancellations.
Catalogs: Scott 355, Standard Collection O213, Michel 336A.
Issued on: December, 1927.
Perforation: comb 12 x 12½.
Printing: Photogravure.
Surcharge: Typo.
Face value: 8 Russian kopek.