Someone call me?
Honestly Stephen has a lot more experience with kaskara than I do, so if he says it's a European trade blade I believe him. The style of cross guard certainly matches with an old sword.
Wood is in surprisingly good shape.
About the stamp, I was half hoping the translation would give a place rather than a name. The name I assume has nothing to give a regional clue? As I understand it Dawud is the Arabic version of David, so probably quite common, Ali of course is a very common name as well in the Sudan.
So, I don't think it's an armoury stamp. I'm wondering if some enterprising merchant stamped a batch of blades he imported or bought up? Would be a decent marketing trick perhaps, as in "I have a Dawud Ali blade and it works great! You should go get one as well!".
That's about the only thing I can think of. As Norman points out, I really doubt this was a one off.
Cheers,
Iain