Mark,
A great find and a splendid example of best Birmingham work .
In his book ,Experts on Guns and Shooting, G.T.Teasdale Buckell, Chapter 14 [7 pages] is devoted to the work and inventions and In praise of W.P Jones.
Of special interest is Mr Jones skill as a gun fitter and his development of shooting schools as we know them today.

Roy Hebbes