Hello Dear , how are you . I would like the help of friends in the identification of this Mauser rifle that I have , because I have no knowledge of the model , year of manufacture, etc. I do not even know the real gauge of manufacturing . Could anyone help me ?
Grateful.

What confuses me more is the same numbering has two , one in action and another in the pipe. And the fact of the pipe have different external diameters , which could not find anywhere else in my research .

Images in http://mauser98.blogspot.com.br/