You show a sporting rifle built on the 1916 Spanish Mauser. It is the 1893 design with oval gas escape port and thumb notch for easier stripper clip loading.
The various stamp marks you show are what I call stamps applied by men long dead for records long lost. Is there a crest or anything on the receiver ring?
Does the .243 marking mean it is now barrelled in .243 Winchester instead of 7mm Mauser? If so, it amounts to a +P loading with factory ammunition.
If you are a handloader, a manual starting load will give you .250 Savage velocity at 7mm pressures and be easier on the old action.