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The stamped marks found on Sheffield Plate resemble sterling silver hallmarks showing town marks, makers’ marks and date stamps. In

Sheffield plate , in metalwork , articles made of copper coated with silver by fusion. Sheffield plate was produced as follows. An ingot of copper, slightly alloyed with zinc and lead, was covered on both top and bottom with a sheet of silver and fired. When the silver began to melt, the ingot was removed from the furnace, cooled, and rolled. The edges of pieces made were rolled over to hide the copper that was visible when the sheet was cut.

At first Boulsover produced only buttons, but his former apprentice, Joseph Hancock, later applied the process to other articles. The production of fused plate was not restricted to Sheffield alone. With the introduction of plating by electrolysis in the s, the production of Sheffield plate declined and by the s had all but ceased. This type of metalware, admired for its soft, glowing, gray lustre, was principally used in making utensils and vessels for the preparation, serving, and eating of food.

Design and workmanship were early brought to a very high level. Many of the early pieces were impressed with hallmarks resembling those used on silver—a practice prohibited by an injunction obtained in by London silversmiths. In , however, Sheffield plate makers were again authorized to use marks that bore the name of the maker and a distinctive device. Demand soon exceeded supply and a number of manufacturers began to make new pieces, reproducing original designs by electroplating on copper.

This falsification provoked the Sheffield Cutlers Company in to establish through the British courts that the term Sheffield plate could be applied only to articles made by the process of fusion—now an internationally accepted definition.