http://www.carbinesforcollectors.com/mauser.htm
Yes
Any good library will have books with them.
Your Spanish made Mauser rifle could be worth anywhere from $50-$300. Value of any gun is based on exact make, model, condition, and originality.
You will need to contact Mauser.
Robert Ball's book of the Mauser is a place to start
There is a model 1895.
You will have to contact Mauser
This rifle (Mauser Model 2000) is worth $350 in excellent condition.
Your question is???
Brazil used a number of Mauser rifles over the years. Most were in 7mm Mauser (7x57), but later versions were .30-06. That number you have is not a model number. sales@countrygunsmith.net
50-200
The Model 1903A3 rifle is base upon the Mauser 98 action but they are not exactly the same.