Spain was one of the first nations to buy the whole package from Mauser: rifles, factory, and tooling. In 1894, Spain adopted the 1893 Mauser with the then-new 7X57mm cartridge, and purchased a turnkey operation at the same time, including tooling and machinery and engineering expertise for their armory facility at Oviedo. They began replacing their old rifles and selling rifles to other countries who would or could not pay for German manufactured rifles. At the end of the Spanish Civil War they looked at several options for rearming and modernizing their arsenal. They looked at Mosin-Nagants and M1917 Enfields in the USA, Carcanos in Italy, and Mausers from Germany, as well as for advice and expertise. In 1943, they adopted the M98 system and installed the manufacturing facility at La Coruna in order to keep their armories separate in case of a coup.
Your 7X57 is likely Spanish, and the cross in the circle is a NATO symbol, meaning the bolt and action probably don't match.