I’m cheating — the owner of this tool told me what it was, but I had to ask. He said it was frozen stationary, but he finally managed to loosen it up. The stone on the right-hand side now spins and moves back and forth in an arc when you crank the handle. He mentioned it’s about a hundred years old, but I don’t have any more detail than that.
Post your guesses here before you check out the notes I posted on my Flickr account with an additional picture.
Toolmonger Photo Pool [Flickr]