Here is a copy of the official letter received from the Russian Post.
The letter says:
To the Chairman of the FIP Section for Astrophilately, I.G.Rodin.
Dear Igor Georgievich Rodin!
In response on your request about the status of the "Post Russia. Russian Segment. The board of the ISS” special mark, I would like to inform you about the following.
This mark with the date setting mechanism for special cancellation is the official named mark issued by FGUP "Russian Post”.
Note: the Russian abbreviation FGUP means Federal State Unitary Enterprise.
