Your rifle is a Mauser 1898 pattern rifle, adopted by Argentina in 1909 as their primary service rifle, replacing the 1991 pattern rifles and carbines. It was originally chambered for 7.65X53mm, also known as 7.65 Belgian and/or 7.65mm Argentine, but may have been rechambered or rebarreled since then. The 1909 Argentine rifle was produced by DWM (Deutsche Waffen und Munition Fabrik in Berlin), and it is considered to be one of the finest examples of Mauser 98 pattern military rifles ever produced.
Your rifle is a standard military Mauser 98 rifle, and will accept all available Mauser 98 parts. Firing pins and springs are available from Numrich Arms. Before you go to the trouble of replacing the firing pin and spring, try giving the bolt a full disassemble/clean/oil, it may just be varnished up oil slowing down the firing pin fall.