Interesting Tim! The blade on that has a cross section like early 19th century cavalry sabres again, very much like that known as Montmorency, also found on British of latter 18th, early 19th. In West Africa, the ceremonial sabres known collectively as 'hwi' used in Dahomey (now Benin) often had a degree of serrated section on the blades. It remains unclear to me what this might be related to, but the 'zigzag' was a common symbolic element it seems.
From a more pragmatic perspective, many English hunting swords of the 17th century and used into the 18th had of course serrated backs on the blades, and these may well have been seen in the trade activity at some time.
One can only speculate what might have been intended, but clearly it seems a European blade mounted for local use, and may have been refurbished many times through generations. It was virtually customary to have blades remounted as they were passed on as heirlooms in many of the tribal cultures, or just as likely, traded or sold.
All best regards,
Jim
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