Monday Mystery, a puller?

Here is another tool sent in by a reader, the jaws might indicate a bearing puller, the screw could drive the wedges underneath the bearing to lift it away? It would only work on something with a short shaft so maybe I'm wrong. The only markings are a W in a diamond (Williams?) and a R in a diamond. Guesses?

Update; A reader, meddleshop, identified this as a clamp for lubricating leaf springs. Thanks!