1927 Sc 177I Black surcharge on 1925 Postage due 7K stamp Scott 369

1927. Black surcharge on 1925 Postage due 7K stamp. Type I
Catalog numbers: Scott 369, Standard Collection 177 I, Michel 320IIY.
Issued on: June 11, 1927.
Perforation: frame 12.
Watermark: Yes.
Printing: Typo.
Face value: 8 Russian kopek.

Surcharge types