So at a local sale last week I spot this little Boyds Jar in a box lot.I buy the box lot and head home to sort out my treasure. Usual junk, and mouse nest and trash.Then I find this bit of stone, or some sort of slate? Hard yet soft... I can scrape some off with my knife. Looks almost stone tool like, yet the thing measures out too evenly about 4 7/8 long, x 2 x 2 3/8 and 1/2 inch thick at thickest point. Hole through it is uneven, and looks worn through, and is tapered in from each side.Has me stumped.... Anyone have a clue? Know what it is? Want to make a wild guess?