Katana,
On these newer pics the blade looks considerably thicker than my example, or is it just an impression due to the large pic size? If it is indeed thick and has a distal taper than my guess is it's a functional blade. On the last picture it almost looks like it has a false edge as well.
Ernesto, you are right that shulas are different, but other than shula and possibly the small flyssa I don't know of any maghrib weapon similar to these "nimcha" that could have influenced the appearance of its blade.
-attaching my shula for comparison-
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