Silver Pocket Watch

I have a pocket watch it must be silver it as the lion anchour and a letter b on it. It also as a maker name W.G.H then it as some numbera 156015 then 778 these are on the inside of the working there is a back inside it as 118 wgh

WGH is probably William George Hammon, a watch case maker from Coventry. The anchor is the Birmingham assay mark, but the b could be 1876 or 1901 - a picture is the best way to resolve this.