Sorry for the vague title but I really don’t know anything about this My calipers are broken so I don’t have any measurements other than
Roughly 25mm length
Roughly 9mm neck diameter
The headstamp looks to either be Cyrillic or NR at 12 o’clock and 1960 at 6 o’clock.
Next to 9mm luger
Sorry for the quality (webcam). Any ideas?