Congratulations on receiving the new sword, always nice to unwrap presents! I should say at the outset that I know very little about swords, nor am I an Arabic linguist, but I was intrigued by your comment regarding the Sudan. I have a couple of observations for your consideration;
1) Some of the etching on the blade looks a little more crude than what I have seen on other Victorian-era swords. I know it's not a Wilkinson but I would have expected the quality of the " Dieu et mon Droit " motto, for example, to have been of a higher standard. What do you think?
2) My very poor Arabic tells me that the engraving on the blade is the Arabic letter " za, " whatever significance that may have!
3) The script on the guard, read from Right to Left, looks like the Arabic letter " waw, " then the numerals " 96 " then the letter " qaf " ( I think ) Again what this signifies is beyond me, I'm afraid.
4 ) This is NOT a pattern of sword that was carried by Egyptian officers of the Egyptian Army, theirs had a Star and Crescent on the guard for a start.
Thanks for sharing pictures of the sword, I hope other better-informed Members can provide more useful information. Good luck.
ps; My apologies. I just realised that I was probably looking at another sword, whose pictures are adjacent to this one on Photbucket, so please ignore my comments about the Arabic script. Sorry!