The Yemen Jambiya.

[SullyAtooly]

Dave, this is based on what I can see from the photos and my apologies if I’m not seeing it properly. Here’s a photo of a very similar Jambiya that’s material used is closer to yours it’s a what is called in Yemen "جمبية مصوعي" Masowai made from natural horn. Most likely buffalo not really sure unless I have it in my hand. Copy and paste the Arabic into TikTok or YouTube to see more examples. Here a photo of one’s that’s sold in today’s market in Sanaa Yemen.