That´s an old Jagdnicker pattern. It was common in further times, and today as well to add some tools like a saw or a "Aufbrechklinge" - the one with the reinforced tip to the handles. The saw was for cutting bone and the reinforced blade was mostly for gutting. It has a blunt tip not to damage any organs that could spoil the meat.
Who was the maker? I don´t know. On your pics there is nothing visible tangstamp or blade etch. Maybe you can look at the blade if there is a shade of an etch on it. The knife looks well loved as I can see on the creamy stag covers. During time an eventually existed blade etch to indicate the manufacturer could have been worn off.
It doesn´t seem to be a souveniers shop knife as it has a good full-tang / half-integral construction. And the additonal tool construction need more labour.
Just a guess: But it could be a PUMA, Hubertus or A. Wingen (Othello) as they made this very pattern in their earlier days. Hubertus still making the pattern today.
Great looking knife!
