hmmm….i'm not sure why you guys are seeing a lot of Yemeni knives. They look mostly like custom folders and there are a ton of variations.
I can't fully speak to the craftsmanship without the knife in hand, but i actually find many of them quite attractive.
How ever, i do question whether these fall under the category of "Ethnographic" and wonder if these are the kind of things we discuss around here.
https://www.google.com/search?q=sana...w=1386&bih=723