Your piece is a DHARIA dagger in the RASHAQ style and comes , as you say, from Asir/Hijaz area of Western Arabia. The term "wahabite" is a loose description used by (mainly) collectors and dealers to describe this type of long dagger.
I agree with Lew that the age of this is probably midish 20th Century 1940s to 1950s. They are not uncommon, in fact if you look, there are at least 2 on a well known auction site.
Pic attached of one I have in my collection. PM me if you wish to discuss anything "off line".
Regards Stuart
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