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The Worcester Porcelain Factory was founded in 1751 by Dr John Wall, Royal Worcester marks incorporating a crown above a circle were first introduced in 1862 and combined the number 51 within the circle signifying the year Dr Wall founded the original company.
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In 1904 further dots (one for each additional year) were added beneath the words 'Royal Worcester England', until 1915 with a total of 24 dots, six dots either side of the crown and twelve beneath the words 'Royal Worcester England'.
The method of using an additional dot for each year was becoming rather cumbersome, so in 1916 a small star was used below the standard mark with the addition of a dot for each preceding year.Indeed, the references we consult often conflict in identifying and dating items.