Congratulations on your first kaskara, and what a beauty too!
This form of blade does indeed seem to be rare, and what interests me about yours is that it seems to have a ricasso, suggesting that it was European in origin. These blades seem to be heavily modified by local smiths and the ricasso is often removed totally.
Hopefully Ed will chime in with a definitive answer on Kassala or elsewhere.
I've seen this figure "2" on a few other examples, but I am rather intrigued about what it might represent - sadly I don't know
Chris