Now that is interesting. The 4th Hussars, second regiment into the battery in the Charge of the Light Brigade, and Winston Churchill's regiment, although he was attached to the 21st Lancers in 1898, when he probably saved his own life by killing some four men in a few seconds in "the last horsed charge of British cavalry", with his Mauser C96. Unfortunately this revolver dates from too late for the owner to figure in the complete muster rolls, with biographical detail, in Canon (and ex-Captain) William Lummis's "Honour the Light Brigade".
http://www.genes.plus.com/ARMYLIST/Dragoons.htm
https://en.wikipedia.org/wiki/4th_Queen%27s_Own_Hussars
Robert Wilkinson-Latham of the Wilkinson family posts in the Antique & Military Sword forum of this website, and has copious Wilkinson records:
http://www.swordforum.com/forums/forum.php
This revolver would have been privately purchased, and one set of initials might be the owner. I would be surer if the escutcheon on the butt wasn't blank. Are you sure that the second isn't "
Late 4th Hussars", as might be done for someone retired or attached to one of the army's administrative and service corps? Cavalry regiments weren't large in those days, and this revolver was state of the at for only a short period, so there is a good chance that the regimental museum will have a record of NBE.
http://www.thequeensownhussars.co.uk...tal_museum.htm
Those proofmarks are interesting, if they do indeed correspond to what you see here. For they are post-1904 nitro proof. I'd have thought this was late for the Webley-Wilkinson, which I believe was superseded as the better-quality version by the WG model. It could be all done as new, or showing reproof by someone who had got anxious about all this new smokeless stuff. I think the Webley-Wilkinson should be fine for the normal .455 smokeless load, though now that nearly everyone reloads for them, care should be taken not to exceed it.
http://www.nramuseum.org/media/940944/proofmarks.pdf
The star of David might be by analogy with a mark sometimes seen on British swords, in the form of a brass or bronze disc expanded into the bottom of a circular recess, though I don't know if Wilkinsons, who were primarily swordmakers, used it. It doesn't appear to have any Jewish connotation. It is simply the about the easiest pattern to machine-engrave on the end of a round punch with six cuts as it rotates sixty degrees.