Hello Katana,
I just find your spear tip question. What you have is definitely a spear tip from the Tubu living in the South East Sahara, mostly in Chad, but also in Niger and South Libya. For reference you can look in Peter Fuchs; Die Völker der Südost-Sahara; page 31. There are some similarities to Mangbetu spears, that's right, but they all have asymmetrical blades. Attached also a Tubu spear (the first from above) from my collection. This throwing spears are around 130 cm long and have at the end of the wooden shaft a small copper winding.
Wolf
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