Strange it has no marks or stamps beyond those numbers, but it really looks as Mauser 98 Action, the bolt, receiver, screws, everything. The handle of the bolt seems to have been worked and the safety flap seems to have been changed for a sporter one to have the chance to be used with a scope in the rifle, in the case it has been a military action.
Brno. Ostrawa. Pilzno. Berlin. Praga. Brno. Ostrawa. Pilzno.