Wonder why, I think that is a Dayton Tryster left side safety. I always ordered the right side Bueller until I couldn't find any for a while and use a couple of the right side Dayton Trysters with no issues other than I liked the looks of the Bueller better.
I like the safety. It's kind of quirky, and I believe the old Mauser's safeties were turned all the way to the left to fire. I'm probably going to drop a trigger and definitely toss the Tasco and put something decent on it. Lol
For $189 you can get the Gentry 3-position safety. I installed one myself...only tricky part is grinding the slot for the bolt lock pin. I put it on a 98 in .35 Whelen, added a trigger guard assembly from a Mark X refinished with Moly Resin, added a Timney and B&C Medalist. It turned out pretty classy.
I honestly prefer using the Buehler style over Model 70 three position. 3 position does look a lot better though.
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I have both and the 3 position safety is the best. If you use a buehler a large objective scope makes the safety useless. It is a great gun you did good! I love old Mauser's!