Originally Posted by
Troubledshooter
Unfortunately, my Webley contact was not around at the time the Mk.I WG was manufactured, so I can't ask him, but as far as I am aware, and I'm no expert, there never was a version produced without the extended sides to the breech block, even though there were many variations of the pistol throughout it's production run.
The missing corners on both the Mk.I and early Junior models came about through careless use by the owners, but were strengthened in the later models that used a similar style of breech block, thus alleviating the problem.
It is quite possible that some owners with the appropriate engineering skills may have carefully remodelled their Mk.I breech blocks, after breaking off one corner, so the pistol could possibly appear as if it left the factory in such a condition, but I have not seen such a specimen.