The Royal Worcester mark basically comprises the Kerr& Binns circular device, inside which are four cursive "W"s, with a crown added at the top.
These marks can occur impressed or printed over the glaze.
To the collector the mark has greater importance, for not only can he trace the manufacturer of any marked object, but he can also ascertain the approximate date of manufacture and in several cases the exact year of production, particularly in the case of 19th and 20th century wares from the leading firms which employed private dating systems.
With the increasing use of ceramic marks in the 19th century, a large proportion of European pottery and porcelain can be accurately identified and often dated.eramic marks are applied in four basic ways: incised, impressed, painted, printed.
Inclusion of the word 'Royal' in a firm's title or trade name suggests a date in the second half of the 19th century, if not a 20th-century dating.
Inclusion of the abbreviation 'R N' (for Registered Number) followed by numerals denotes a date subsequent to 1883.
In 1710, the necessary ingredient of kaolin clay to make hard paste porcelain was discovered within his territory and used at his new factory in Meissen.
Most 19th-century marks are printed, often in blue under the glaze when the main design is also in underglaze are several general rules for dating ceramic marks, attention to which will avoid several common errors.
Incised into the still soft clay during manufacture, in which case the mark will show a slight ploughed-up effect and have a free spontaneous appearance.
Impressed into the soft clay during manufacture, many name-marks such as 'Wedgwood' are produced in this way from metal or clay stamps or seals. Painted marks, usually name or initial marks, added over the glaze at the time of ornamentation, as were some stencilled marks.
From the earliest days of the China trade, Chinese porcelain had been highly valued by Europeans, and the expansion of trade in the 17th and 18th centuries brought a greater supply and greater exposure for Chinese porcelain in Europe.
Europeans, however, were also trying to perfect the technique of making their own hard paste porcelain.