Re: Imman. Meffert Suhl drilling
The name Immanuel Meffert turns up on a fair number of German shotguns and drillings from around 1900-1930, but that gun is a lot older than that. I can find nothing on the man himself, but think it possible that it was either a company or a family business, with the name repeating over generations.
That aside, the gun should be worth enough to justify a professional restoration, even to the expense of making a new stock. Perhaps others more familiar with those guns can recommend someone to do the work; it would not (IMHO) be a job for someone with a bottle of Elmers.