Welcome aboard Tom. Since you joined a while back, you already know that there is a world of information here, provided by some very nice people from all over the world. I too collect Imperial German militaria, with special interest in cavalry items--including unit marked Lugers, leather...
I collect all kinds of Imperial German cavalry memorabilia to include pickelhaubes, unit marked Lugers, sabers, carbines, lance, saddle with all associated leather, steins, smoking pipes, etc.
The straight saber appears to be a cavalry quill-back combat weapon (that is if that is a rivet through the handle--there should be two). If it is, there might be a unit mark on the basket hilt. More photos please.
I know that I am ignorant and I am about to prove it. What is their fascination with rabbits? I know that they are tasty but that doesn't appear to be the driver.