Milto got it in one. It has a commercial stock and it started out life as a model 1898. Have the chamber checked it may have been converted from 7X57 to 7.62 (308). The SJG is Schweitzerische Jndustrielle Gesellschaftthe Germans, and German Speaking Swiss used J for I until the 30's. Barrel was made in Switzerland by what is not know as SIG.
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If the problem can be solved why worry? If the problem cannot be solved worrying will do you no good.
Shantideva
What me worry?
A.E. Newman