please help on this knife

[Conogre]

From the look of the crack at the bottom, I'd say that your assesment was probably correct and it was actually done fairly well.
The terms "common" and "rare" can sometimes be misleading, with a flyssa being common to a long-time collector who has seen, handles and owned many, while that same flyssa to a new collector, is indeeed a treasure, and rightly so.
As more and more countries "modernize" the old ways of making pieces are fast vanishing forever, with even its true name lost in as little as one or two generations.
With weapons like a flyssa, if you've only held a small one it's impossible to realize just how remarkable a large, sword-sized piece can be, thinking that the "delicate feel" of the knife must be carried over into a sword, which it most definitely is not.
For whatever it's worth, many "purists" regularly pass over truly rare pieces because they are different, thus not a "real" one.
One thing about ethin bladed weapons is that there are as many different ways to view the pieces and the cultures that produce them as there are weapons themselves.
Mike