Seeking more about this African copper knife

[Uncle Bertie]

This was also in the small collection of knives and swords I recently got. I love the carvings on it, and I'd love to know which culture is likely to have produced this.

The blade has been cleaned lightly with fine wire wool and white spirit and now looks (to me) really stunning.

I have tried doing some searches online, but I need your expertise really. I thought it might by Kuba or Dan, but it doesn't reflect the shape of the Kuba or Dan knives I've seen online.

I'd also be interested in your thoughts on age as well. Thanks