Antique medical real human skull jaw bone mandible
This jaw bone was an additional item that came in with a collection of skeletons. There was no skull that it matched with and must have come from another item in the past. There are paired holes in the ramus where the springs would have attached that would have articulated the jaw on the skull.
This would have been from an early medical skull as the few remaining teeth were held in place with plaster to build the jaw up and set the teeth. The jaw has also been broken and glued together again as the fracture can be seen.