MB:
To expand on Rocketman's post....
My William Evans is a 12 GA SxS, and exhibits all the characteristics of the Webley & Scott "Patent Screw Grip". The serial number of the frame is 51XX, and this 51XX shows up on each barrel just forward of the barrel flats. However, on the bottom rib, just forward of the fore-end lug the number 633XX shows up. That number (I believe) represents the 633XX set of barrels made up by Webley & Scott...and this case furnished "to the trade". The gun exhibits London proof marks, not Birmingham.
So I speculate that Williams Evans "bought in" the barrelled action and had it stocked, engraved and "finished" by their own in-house artisans and/or local London artisans.
633XX represents AD 1901 Webley & Scott production from a list I found somewhere....can't remember now.
