I got 10 of those vintage Soviet cassettes from Ukraine before the war, and I must say I am not as exited as some people.
Mine were all NOS. They are typical Sovjet era quality - some fit tightly, some don't.
Some don't just drop into a Barnack leica - they have to be pushed in.
They smell bad of residual chemicals. Their outer black paint sticks to masking tape if you use that for labelling your cassettes.
I paid €24 including shipping if I remember correctly, and while not a fortune, I find reuse of regular commercial cassettes much more convenient and economical.
You can see with your naked eye that they are not made to tight tolerances: