Here is the promised pic.
It comes from the book 'Seltene Afrikanische Waffen' (rare African short weapons) by Manfred A. Zirngibl (1983, p 58).
In his book, he states that this piece only has a decorative or ornamental function.
Length : 67 cm.
If I'm correct, both edges of your sword are sharpened. These swords were used to hit an opponent who is carrying a big shield. I guess it's used with the inner edge in front. In this way, one can go round the shield to hit the opponent.
Anyway, the other edge can also be used if necessary.