John Sheils (Shields) Dublin
John Sheils worked from 1762-1798. He worked on upper Ormonde Quay, and was apprenticed to one of the finest Irish silversmiths, Robert Calderwood.
Sheils's maker’s mark was JS with a dot in between. This is slightly unusual for the era, as J was often written as I at that time, and is a nice way of identifying his mark.