John Maddock & Sons Ltd.
Royal Vitreous, Majestic: Burslem, Staffordshire. 1855 - no longer in operation (was known to be in operation in the mid-1960's
Earthenware of various kinds.
"Ltd", added to the title in 1896, many fully named printed marks, including the trade named: Vitrified or Royal Vitreous (c.1880-1896).
1842 - 55 J. Maddock; from c.1855-70 J. Maddock "and Son" and then from c.1870 "and Sons"
Previously
J Maddock
Mark
Description & date
This mark was used by John Maddock before 1855, Other similar marks can be found with the name J Maddock "& Son" added.
John Maddock & Son (NOTE: not "sons")
c.1855-70
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Printed mark c.1880-96
(Ltd was not added until after 1896)

Printed mark c.1880-96
(Ltd was not added until after 1896)
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Printed mark c.1896+
(note the addition of Ltd)
Printed mark c.1896+
Printed mark c.1906+
This is the only mark with "& CO" -
Marks before and after this one all have "& Sons"
Printed mark c.1906+
Printed mark c.1927+
Printed mark in use in the early 1930's
Printed mark c.1935+
Printed mark c.1945+
Printed mark c.1945+
Similar to the 1927 mark but "ENGLAND" replace with "MADE IN ENGLAND"
Printed mark c.1945+
"Ivory Ware" replaces the earlier "Royal Ivory"
Printed mark c.1955+
Printed mark c.1960+
Printed mark c.1961+
slight variations occur
Maddock Pottery Co of Trenton, New Jersey, America.
Printed mark c.1893-1900
any mark with 'Maddocks' (note the 's' at the end) is an American company and not Maddock & Sons of Burslem, England.
The company dates from 1893-1915. The company was owned by Thomas Maddock & Sons, Moses Collear, C.A. May and Thomas P. Donoher.