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OSP Pair of table salts, the interiors gilded to prevent corrosion. 'Bleeding' of the copper can be seen on the rims. Old Sheffield Plate (or OSP) is the name generally given to the material developed by Thomas Boulsover in the 1740s, a fusion of copper and sterling silver [1] which could be made into a range of items normally made in solid silver. [2]
"Guide to Marks of Origin on British and Irish Silver Plate from Mid 16th Century to the year 1950 and Old Sheffield Plate Makers' Marks 1743 - 1860" compiled by Frederick Bradbury F.S.A.(1950). This was done within the Globe Works premises. The business was eventually transferred to his son George Bishop and became George Bishop and Sons.
The Book of Old Silver, English – American – Foreign, With All Available Hallmarks Including Sheffield Plate Marks. New York, NY: Crown Publishers. International Hallmarks on Silver Collected by Tardy (reprint ed.). 2000.
It was located first at Silver Street (1806), Cornish Place (1822) Sheffield. Their registered trade mark since 1879 was a Trumpet with a Banner hanging from it. Although registered in 1879, the "Trumpet with Banner" logo was used at times before registration and appears on some of their silver plate pieces.
Thomas Boulsover. Thomas Boulsover (1705 – 9 September 1788), was an English Sheffield cutler who invented Sheffield Plate.He made his fortune manufacturing various items, but especially buttons using the process, he later diversified into making cast steel and saws.
Originally, only silver produced within twenty miles of Sheffield could be marked at the office. From 1784, Sheffield was empowered to keep a register of all maker's marks within one hundred miles, including those of Birmingham. Sheffield Assay Office, October 2008. In 1795, after several moves, an office was established on Fargate. In 1880 it ...
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Communion service by Shepherd and Boyd, c. 1816. Shepherd and Boyd was an American silversmith partnership between Robert Shepherd (1781 – March 6, 1853) and William Boyd (September 14, 1774 – April 24, 1840), active at 136 Market Street, Albany, New York, from 1806 to 1830.