Re: My first old gun.....Spanish Mauser Info Needed
Your rifle is one of the converted ones imported by Samco Arms in Miami, Florida. It was originally in 7X57 Mauser and the 308 it is converted to is closer to the 7.62 NATO pressure than the modern .308 Win. In fact, until it is checked out and headspaced by a qualified gunsmith I'd be very careful about shooting it.
You're also going to have to fix that trigger /sear engagement problem to make the gun functional. You might try Numerich E-gun parts for replacements.
I have a 1916 Spanish Mauser in the original 7mm Mauser caliber that I got for under $20 back in 1967 right out of the Montgomery Wards catalog. It was in new condition and didn't appear to have ever been fired. All numbers are matching. The stock is a black turkish walnut. It's a sweet shooter.
Fear is a reaction..........Courage is a decision