interesting thought. So could be for ribbon/paper/film of some kind. Seems the closest we can get is that it winds and unwinds...something, lol. The more I look at it and the more it's discussed, the more I think that this has to be just part of a larger whole. As it is, this thing is missing screws that hold gears in a fixed spot. Obviously mounts to something, and may be missing a bottom. I think this will just remain a curious thing. Maybe eventually someone will find a complete one, with some sort of markings and then by that we can know what this is a part to.