It was used primarily for seal hunting.
Our example, with a double barb and double shoulder, is the rarest of the harpoon point models. It was found in the south and west of Patagonia (in particular the banks of the Beagle Channel and the Strait of Magellan).
The blade, patinated by use, has a beautiful inscription "Patagon".
Bibliography: Preliminary overview of the bone industry of Patagonia [article], D. Legoupil, Bulletin of the French Prehistoric Society Year 1978 75-11-12 (E&T) pp. 543-558