Hi Tom
A few months ago I saw one of those 19 century orientalist paintings of a Sudanese warrior on ebay and he was wearing a large Tebu style dagger on his left forearm hilt faced down. The scabbard was Tuereg looking with a round brass arm band hold it in place. Unfortunately I was stupid and the auction ended before I was able to bid on it
By the way I just picked up another large karra dagger like the last one I posted it also has incriptions on the blade and I will post some pictures as soon as I can.
Lew