Opinion: 2nd stamp 7 kopek, is not double print, but 2 cancellations, 1 blue, 1 black.
Sc#5 and #35
Thoughts; I have no blue Pmks in these issues. Perhaps a Violet Pmk from St Petersburg (geometric numeral designs = otdels) ? Unsure if these came in blue ink.
The blue cancel could have been made when the latter arrived in a foreign destination, that's especially common when the letter had extra services, such as registered.
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