Bugger - The manufacturer is likely Baikal.
They have been making guns for a long time. Used to be imported to the US by EAA.
Different models and such, some may be older.
I don't think it matters if roll vs star crimp, I have shot both types in my Baikal O/U without much discernable effect.
If it is fixed chokes, most SxS of O/U guns will be M/F.
Hope it helps.
