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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]
The mark for silver meeting the sterling standard of purity is the Lion Passant, but there have been other variations over the years, most notably the mark indicating Britannia purity. The Britannia standard was obligatory in Britain between 1697 and 1720 to try to help prevent British sterling silver coins from being melted to make silver plate .
"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.
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.
This prospered and in 1762–65 Hancock built the water-powered Old Park Silver Mills at the confluence of the Loxley and the Don, one of the earliest factories solely producing an industrial semi-manufacture. Eventually Old Sheffield Plate was supplanted by cheaper electroplate in the 1840s. In 1773 Sheffield was given a silver assay office. [64]
Thomas Boulsover needed financial assistance to set up a business in fused plate and it came from Mr Strelley Pegge of Beauchief Hall who loaned him the necessary capital. He went into partnership with Joseph Wilson whose father was a scythe smith at Sharrow, setting up a workshop on Baker's Hill in Sheffield. The main product of the business ...
Household silver or silverware (the silver, the plate, or silver service) includes tableware, cutlery, and other household items made of sterling silver, silver gilt, Britannia silver, or Sheffield plate silver. Silver is sometimes bought in sets or combined to form sets, such as a set of silver candlesticks or a silver tea set.
The Birmingham Assay Office is managed by a board of 36 "Guardians of the Standard of Wrought Plate in Birmingham", between six and nine of whom must be connected with the trade. [3] The assay office marks for London, Birmingham, Sheffield, and Edinburgh. The second from the left shows the anchor for Birmingham.