This is a specialist knife blade for butchering raw meet. The curved thin blade is designed to slice through joints in raw carcasses. The shape of the knife with its right angle curve in the blade is made to slash across flesh and so separate the meat from bones, ligaments and other parts that are not wanted. It is a specialist knife and does not work well for cutting or chopping vegetables and other regular kitchen work.
The butcher knife shape comes from a very old design. In the wild these knives were used for a huge variety of tasks, for cutting up food, skinning animals and self defense.
Global also produce a GF-27, fully forged butcher's knife. This knife has a bolster which provides a bit more protection when working with raw meat.