Tim, keep in mind that purple, due to the difficulty in getting natural dyes that color was for centuries ONLY allowed to be worn by royalty, as far back as ancient Rome and possibly earlier.
Purple, in older African pieces using traditional dyes, was made by crushing a certain kind of scale insect, while ochres and white were earth pigments and black often charcoal or pitch.
I strongly suspect that you have the African equivelent of a trapper's or mountain man's knife from the American westward expansion era where they were often in contact with native locals moreso than other colonists and settlers, and often carrying knives that were made from trade knives and then embellished by the tribal locals as a gesture of respect.
Mike
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