1926 Sc O138 Worker Scott X

1926. Worker. This stamp had never been in normal postal circulation, but was sold at philatelic stores, also exist with CTO cancellations.
Watermark: 11b/170.
Catalogs: Scott not listed, Standard Collection O138.
Issued on: July, 1926.
Perforation: Imperforate.
Printing: Typography.
Face value: 8 Russian kopek.