Hello Gent’s

I’m considering getting a double rifle and have found a interesting gun. It is a o/u gun with has tree barrels – one 16ga one 7x57R and one combining the two. Both the double rifle and the combination has a german Einhack mount with a light 4x Henzholt scope. All this making it a nice set for European hunting.

But I’m a bit confuse with the maker of this gun. The barrels engraved K. Wagner Karlsruhe I/B – but the locking part of the barrels has the stamp form K. Bittorf Suhl.

Does anyone know of these gun makers?
Can I see anywhere which load the gun is regulated with like it’s common with British guns?

D93