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haveo
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It's Russian so could be anything, having said that, it doesn't look great.
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Then what are the notches on the thread for?
Probably for holding the hub while you try to remove sticky sprockets, so that you don't have to resist the torque by holding the rim and thereby rip the hub free from its moorings :-)
There doesn't appear to be a left-hand lock ring thread, so the notch may be for a right-hand threaded lock ring with some sort of detent mechanism.
It could be a jigging point used during assembly which has no purpose for the end user.
edscoble
gbj_tester
In fact, I'd go further and say
https://www.youtube.com/watch?v=E6tBdovAgO0