I have had two rifles on which the G.L. Rasch name is inscribed. One is an 1890 Haenel/Rasch in 9 X 57 on a Commission rifle and I'd have to dig through my gun safe or records to name the other. I believe it's a stalking rifle. Anyway....that is a lovely old Mauser and I too have a fondness for them. The side panels and keyed fore end just suck me in as does the DST's and butter knife bolt handle. If you don't already know, and if you're going to shoot it, slug the bore. I would expect it to be .318 groove diameter but, one needs to be certain.
The engraving is quite similar to what is on a Thieme & Schlegelmilch drilling I used to own. Whatever its quality, it's still light years better than laser etched.
I agree with Carcano about the rear scope base wing. If you should have rings made, a pricey proposition, I would demand they be made period style. I have two rifles so equipped with modern made claw mount rings that are of modern style with Torx head screws and IMO, they look dorky but, at least I have them. Both sets are on double rifles and neither rifle was regulated with a scope so if the scopes are installed it renders both rifles as expensive single shots.