The best made rifle I have ever owned and it isn’t even close was a 9809 Argentine Mauser made by DWM in Berlin.
It was stamped “Deutsch Waffen und Munitionsfabriken Berlin Modelo Argentino. 1909. The 1909 meant that my particular rifle was actually made in 1909 so it was an early one.
The bluing was actually a fine matte yet still well polished blue. And it really was blue instead of black. The small parts were finished in a bright cobalt blue. The workmanship was better than anything made today except by custom makers.
My particular one came with the test target and Herr Ritzman had fired a two inch group at 200 meters with open sights then signed the target. My guess is the really good shooting ones were separated along with their test targets but they eventually sold them and I got a great rifle.
I have the same thing, except. It is so cherry, I don’t think it was ever even fired except for at the factory. It is beautiful. It has the green leather sling, and the silver handled bayonet with a real quillon.... (a curved hook on one side and a straight guard on the other.
Odd ammo, though.....7.65mm