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Finally it was agreed that the official founding of the manufactory was in 1764 even if the founding corporation already existed.
Around 1990, the unidentified painter’s mark, a crescent, was attributed by Bernard Dragesco, a French Porcelain Society member, to Louis-Denis Armand, l’aîné (the elder), the factory’s finest bird painter, active between 17. The Sèvres factory introduced a hard-paste porcelain body in the 1770s, following the discovery of a French source for kaolin in 1765-8, at Saint-Yrieix, near Limoges.
A list of the factory’s decorators’ marks can be found in David Peters, Sèvres Plates and Services of the 18th century, (2005; new ed. The new material affected the enamelling process, so wares in the new body were marked with a crown over the interlaced ‘L’s.
Date codes or marks were nearly always used alongside the standard mark up until 1966 when a different format of back-stamp was introduced.
The more modern items, from the late 60's onwards, mostly used black or gold back-stamps.
Here, the ‘u’ enclosed within is the date letter for 1773, above is the dotted ‘T’ mark used by the flower painter François Binet (1730–75), above a gold hashtag device used by the gilder Michel-Barnabé Chauvaux, l’aîné (active 1752–88) and the gold ‘VD’ dot cipher used by the gilder Jean-Baptiste-Emmanuel Vandé, père (active 1753–79).
There is also the incised mark, ‘jd’, added by the formers before the first firing of the broth bowl.When the factory moved in 1756 from Vincennes to Sèvres, near the court at Versailles, the same marking system was used.Here, the letter ‘H’ is enclosed within the ‘L’s in blue enamel, indicating that it was made in 1761.Between the years of 18 the last two numbers of the the years were occasionally used to indicate the year of manufacture but in 1867 a more organised method of date codes was introduced, with a letter beneath the standard mark, 1867 used the letter A, 1868 used B, 1869 C and so on.In 1891 Royal Worcester introduced the words 'Royal Worcester England' beneath the standard Worcester mark with the addition of a dot to the left of the crown in 1892, followed by a further dot to the right of the crown in 1893, and this continued until 1903 with a total of twelve dots, six either side of the crown.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'.