Thread: Unknown sword, German?

Hello,
I'm doing a bit of web research for the garrison museum, and I've been unable to find out so far what this sword is in order to get an idea of its value. The donator thought it was a Prussian army sword, but neither the museum director nor I agree. A poster on another forum said it looked like a Bavarian WWI sword he'd seen. The portepee is the same design as WWII German naval ones, only the threads on this are black. There is no makers' mark on the blade. Letters engraved on the scabbard are "AR", they don't show well in the picture. the blade is engraved differently on both sides, with foliage, crossed long guns, a pistol, shield with cross, scrolls? etc. Any thoughts would be much appreciated. Sorry my pictures are not so great.
Thanks!

The etching looks very Prussian (German) but I am not an expert on court / dress swords.