PPSH-41 marking

[KarsaiBalazs]

Hello all,

Does anyone know which maker's mark might be ЖБ found on my gun? Also found a З (cyrillic Z)... Any idea? I've found nothing on net
Thanks!
Balázs

[AndyB]

I believe the ZB is a serial number prefix? and the 3 could be the production plant.best regards,Andy