I agree with it being Burundi. A very colorful one I might add!
The bar on the face is what I usually look at first. On a Tanz, the top of that bar will be over the nose, like a nose guard and a Zaire will be more of a zoro mask and Burundi is more straight up and down. Those cover your six bar cyphos. 7 bars would be a kig (kigoma). There are other items to look at to but that should get you pretty close.