The story I was told is that it was used for bringing messages to other islands in the Casamance delta. This one is a copy of the original one, which was broken but hundreds of years old(But well we know what that can mean, maybe they counted the years of the age of the tree it was made from to it
). On traditional occasions, like when a wedding is going to take place, they still use it, the guide told. But when you visit my country the guide tells you we still walk on wooden shoes I'm afraid. So the only solution will be a nice holiday in the Casamance region to find out yourself.... This is all I know.
All the best,