Scope safeties available from Numrich
Shop for your Low Scope Safety, New Reproduction with Numrich Gun Parts - the world's largest supplier of gun parts.
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and Timney
Best replacement triggers available
timneytriggers.com
Numrich costs less, but Timney will be more helpful getting the right part.
I think it is an Argentine 1909 Mauser, '98 type; they were the main users of 7.65 besides Belgium whose rifle was a different model and Turkey who changed over to 8mm.
It has a German bolt sleeve (The whole action might be German with an Argentine barrel installed, have to look for the makers mark or country crest under the front scope mount.), drilled and tapped for scope and peep sights, set into a plastic or painted wood sporter stock I do not recognize, with a Remington trigger guard on the blind magazine stock.