As I'm the one who suggested 19th century German I may as well chip in.
The blade is in my opinion a normal export pattern in that this type turns up enough in kaskara that they don't appear to be one-off imports. I would assume it would be from Solingen. Solingen makers exported heavily to the Sudanese market and specifically for kaskara. While the main makers I'm familiar with were Kull and Clauberg there would have been 9 major makers in Solingen at the time. Not every batch of blades seems to have featured stamps or markings. 94cm is a pretty standard size for kaskara blades, I assume overall it is about 1.1-1.2 meters? These nicely made, wide fullered blades turn up occasionally as what I think are genuine European imports and quite often as cruder local copies. You've got the good kind.
The ricasso on this is pretty normal and is just the base of the blade left as is and not ground to an edge. Nothing particularly odd about it just not all that common, I have seen them before - for example here's one from the sold archive at Oriental Arms.
http://oriental-arms.com/item.php?id=1221
So in summary, definitely European, I think made for export pattern just based on circumstances and that I've seen others of a very similar form and the ricasso is just how it was hilted up. Just my opinion of course. Stephen or some of the other guys more heavily involved in kaskara research can, I'm sure, add more.