Im surely no expert either Teo
but I just go by what I've seen in various cases. It seems that similar kinds of motif, the lattice type forte decoration etc. is something that became very popular in 18th c. Austria. These kinds of motif, along with so many other elements of military fashion of course spread across Europe, so its hard to really specify. I would just be inclined to Eastern Europe as this kind of decoration often seems paired with a lot of the religiously primed symbolism etc.
Whatever the case, this blade seems in context with the impression of such ornate type examples which seem to have been suggested in some of the narrative material I have seen from the Mahdist period.