This a large ring 98 Mauser action. From the markings it was most likely a code byf or Mauser Mfg. This gun should be hardness tested and Black Lighted for cracks. The Mausers were hardened on the surface and lacked modern heat treating. These rifle can shear the bolt recesses after being exposed to high heat. The rifle may accept many rounds before the stress allows the gun to come apart. I would make a nice wierd Mauser Action lamp out of it.