In Armes Traditionelles d'Afrique a dagger of very similar form is illustrated and listed as Mandingo Mali. But as we have seen many times and know, this type of work and form can be found across a great swath of West Africa from Ivory Coast as Lew mentioned to Northern Nigeria. I do not think there are many turtles in Mali or Northern Nigeria
. Except the turtle image is significant throughout the whole region and beyond
.