I do know Scott made lots of screw grip actions for other makers...
You do? Interesting, since they never made any.
Nitro the rib extensions on the guns you listed don't match the pictures of the rib extension in the W&C Scott book or old catalogs that I have.
Of course not.
These guns were Philip Webley & Sons developments and products, not W. & C. Scott's. After T. W. & H. J. Webley acquired W. & C. Scott in 1897, the separate product lines of both companies were essentially continued, until the Scott line was dropped in the 1930's. Webley's W & R and A & W models can be found in the Webley & Scott catalogs after the merger. I find them in both the 1914 and 1922 catalogs. You won't find them in a W. & C. Scott catalog.