Actually, they're part of an exhibition of Phoenician culture (1500-300 BCE) at the Hecht Archeological Museum in Haifa, Israel. While I've seen a lot of pre-Bronze-age flints, these are the first I've seen where the handle and means of attachment were so well preserved. They're a little more recent and non-metalic because they had to be waterproof (those Phoenicians were sailors). And it's not completely unlike wa-handled designs, which themselves probably date back a thousand years or so. . . .