With prominent hips and breasts, Piette et Laporterie (1894) described this as a dagger handle, with space at the back for a blade. 

reading list

cover image source

Photo: Don Hitchcock 2015Source: Original, la salle Piette, Musée d'Archeologie Nationale et Domaine, St-Germain-en-LayeCatalog: MAN47260, available at https://www.donsmaps.com/brassempouy.html