English silver open face KW KS Case c1875

This is an English silver case, which has a hinged inner, back and snap on bezel. The case has case makers marks for JW ad hallmarks for London 1875. The case has coin edged sides, engine turning and a gilt finish inside. The case is for a key wound / key set movement and will take a movement 36mm wide on the back plate. The case has a mineral glass. The case is in 95% mint condition – mint condition but needs a good clean