The W&R sidelock, a screw-grip, was very popular and supplied in several original quality grades. Matter of fact, the screw-grip was a feature of several boxlock actions from W&S.

The left gun is an early 1890's Woodward and may be pretty near a London built gun. The middle gun is a A&W #52 (if memory serves), a middlin' grade BLE, and the right gun is the Woodward shown above. Note that the A&W uses a doll's head rib extension and the Proprietary uses a parallel sided rib extension.