Unknown knife/dagger Ethiopian origin

[AntSword]

Hello, and thanks in advance for reading this. Can anybody tell me a bit about this knife/dagger? The only info I have is that it came from Ethiopia, early 20th century. A little over 20 inches long, what looks like wood and horn for the hilt, and a coin (date 1922) on the pommel. Not much of the leather sheath left.

Thanks again,
Zach