Does anybody knows any information about this?
Compared with 7.92×57mm
Looks like a 7x57 Mauser by Societe Francais de Munition c1900.
True, but not with a 7.9mm bullet. I think a very accurate projectile diameter measurement is in-order.
7.9x57 patrone 88.
Bullet maybe set back a bit.
Orange is right it is 7+57 SFM I have the same round in good condition
there is also another round like it with the stamp SFM 1896