Hi Mauro,
I agree the sword is probably not Baule, it is possible to see this blade style in other cultures.
For example here is an almost takouba like sword that was sold at auction a while ago with this style blade.
http://p2.la-img.com/690/18683/6326445_1_l.jpg
And here is an interesting wooden sword with a similar hilt shape.
http://anthro.amnh.org/anthropology/...20%2F%20%20394
I am sure I have seen at least one very similar sword before but I am having trouble remembering where...
Cheers,
Iain