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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 stamps: "Nimrod " and " Patent No.33196 " (Moffatt's patent 11396 of 1887) are to be found on extractors and shooting gadgets as well as stamps of numbers 8, 12, & 16, showing the extractor ([cartridge puller]) gauge. Some rare sterling silver whistles are found with the standard British silver hallmarks of the time and initials "J.D & Sons".
"The words "silver" and "sterling silver" describe a product that contains 92.5% pure silver. Silver products sometimes may be marked 925, which means that 925 parts per thousand are pure silver. Some jewellery described as "silver plate" has a layer of silver applied to a base metal. "Coin silver" is used for compounds that contain 90% pure ...
The firm of Thomas Bradbury and Sons, silver platers, is represented by day books, ledgers, orders, correspondence, etc., going back to the 1780s. A particular feature of this collection is the fine series of early engraved catalogues of old Sheffield plate.
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.
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.
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Plated tableware. Plated ware refers to articles chiefly intended for tableware consisting of a base metal or alloy covered by one of the precious metals, with the object of giving them the appearance of gold or silver. [1] Historically, the standard amount of precious metal used was an ounce of silver per square foot of surface area (2.8cL per ...