I have a throwing knife in my collection, similar to the one on the left (see pics above).
It took quite some time to identify it. A very knowledgeable person directed me to the book, I mentioned before. Although my piece is smaller, it has a similar form.
This throwing knife has a very simple design. The handle is covered in cloth. Total length : 53 cm. Origin : Zulgo (Eastern Sudan).
P.S. : For those interested : Zirngibl published two books on African Weapons. These books are still available at the publisher. Here's the link :
https://ssl.kundenserver.de/s8782122...dex.shopscript