That is a standard configuration M98 short rifle. It is the one-size-fits-all rifle for developing nations in the early 20th Century, being one of the best and most heavily marketed pieces of military hardware ever made. You will find them in 7X57, 7.65X53, 8X57, and converted in the 1950 and 1960 to 7.62X51 NATO. Country of origin is hard to determine without a crest or armory markings. It could be Spanish, Brazilian, Uruguayan, Bolivian, South African, Belgian, you name it. Militarizing nations bought rifles from Czechoslovakia, Belgium, Germany, Austria, Serbia, whoever was offering rifles for sale at the right delivery time and price. Many also procured tooling from Germany, Belgium, or Czechoslovakia and made their own M98 rifles from local steel, so quality can often be somewhat sketchy. And, of course, there were many copies made without the benefit of engineering input from Europe.
Your rifle looks like it needs a good scrubbing, but may actually be in fair condition. Find out the chambering, it can tell you a lot sometimes.