This is a replica of an actual human skull. It was carved by "D. McMasters" of Joliet, MT, and is a life-size incredibly detailed reproduction. It was found buried with a bunch of Indian artifacts in a junk store in a hippie town in California, so it could have been used for anything -- movies, science, creepery. The store said it was at least a hundred years old but there is no age inscribed. It's a work of art, though, indistinguishable from the real thing.
Oh yeah, it might be haunted.