Middle Eastern Knife??

[ariel]

I suspect it is indeed a Wilkinson blade, but heavily re-shaped: shortened and converted into a dagger. Look at the etched area : the closer to the tip, the more narrow it gets, to the point that very close to the tip it runs off onto the edge.
The overall construction reminds me of Balkan renditions of a Kindjal, with a lot of brass on the handle, handguard etc. Trench art ? Too sophisticated... And the scabbard is very well made. Looks like a professional job, either intended for real use or souvenir-ish.