Pottery Marks Identification: How to Read a Backstamp

The fastest way to identify a pottery mark is to date it first and name it second, because the wording on a backstamp is governed by law and company registration in a way that a logo is not.

Start with the country of origin. The word ENGLAND was added to comply with the US McKinley Tariff Act of 1890, and with very few exceptions it was not used until 1891. MADE IN ENGLAND was generally introduced in 1914. So a plain ENGLAND points to roughly 1891 to the First World War, and MADE IN ENGLAND to the years after. The same logic works for other exporting countries, because the rule was an American import requirement rather than a British fashion. Federal law still requires every imported article to be marked conspicuously, legibly, indelibly and permanently with the English name of its country of origin, for the benefit of the ultimate purchaser in the United States.

Then look for a company form. Marks carrying Limited, Ld. or Ltd. always date from after 1861, and although there was only one limited company in the potteries during the 1860s, conversions grew rapidly in the 1890s. A mark without Ltd on a firm you know incorporated in a given year is usually earlier than that year.

British registration marks are the closest thing pottery has to a date letter, and they are frequently misread.

The diamond, a lozenge containing coded letters and numbers, was used from 1843 to 1883 under the Copyright of Designs Act. It comes in two arrangements. In the earlier one, running to 1867, the year code sits at the top, the month at the left and the day at the right. In the later one, from 1868 to 1883, the day sits at the top, the month at the bottom and the year code at the right. The bundle number in the remaining corner can be ignored.

In 1884 the diamond was replaced by a simple sequential number preceded by Rd or Rd No. Numbering began at 1 in 1884 and had reached roughly 351,000 by 1900, 673,000 by 1920 and over a million by 1990.

The crucial caveat is that a registration records when the design was first registered, not when your piece was made. Manufacturers went on producing registered patterns for years, sometimes decades. Treat the registration date as the earliest possible date, then use the country-of-origin wording and the company form to close in on the actual one.

How a mark was applied narrows the period and the kind of factory.

• Impressed marks, pressed into the raw clay before firing, are the oldest method and continued on stoneware and studio work long after printing took over. They sit below the glaze surface and are often faint.
• Printed or transfer marks are the industrial norm from the nineteenth century onward, and their colour is informative: black and blue underglaze early, a wider range of colours as overglaze printing became cheap.
• Painted marks in enamel or gold are found on decorating-studio work, where a blank made by one firm was decorated by another. Two marks on one base, one printed and one painted, usually means exactly that.
• Paper and foil labels were used heavily in the twentieth century and fall off, which is why so much mid-century ware is unmarked today.

A royal coat of arms in a mark is earliest confirmed around 1806. The version used to 1837 has a small shield at the centre; from Queen Victoria's accession the shield is gone, which splits the nineteenth century neatly in two.

More misidentifications come from numbers than from anything else on a backstamp.

• Pattern numbers are the most common. They are sequential within one factory and mean nothing outside it.
• Shape or mould numbers identify the form, not the decoration or the year.
• Four-digit numbers that look like years are usually pattern numbers or, on American ware, the year a firm was founded rather than the year the piece was made.
• Painters' and gilders' marks, small initials, numerals or symbols in enamel, identify the worker paid for that piece. They are useful for authentication but not for dating.
• Size codes and capacity marks appear on jugs, bowls and hotel ware.

If you cannot make a number behave as a date, assume it is not one. The words on the mark and the registration system are where dates actually live.

A great many pieces carry no mark at all, and that is not a verdict on quality. Marking was never universal in the British industry, and the paper and foil labels that many twentieth-century factories relied on have simply fallen off.

When the base is bare, work from the object. Earthenware is porous and opaque, porcelain translucent at the rim when held to a lamp, stoneware dense and often salt-glazed. The way a foot rim is cut, glazed or wiped is factory-specific. Genuine base wear is irregular and concentrated where the piece touches a table. Transfer joins and hand-painted overlaps date a piece by technique.

Photograph the base with light from a low angle so impressed marks throw shadows, take a second photograph of the whole piece, and a third of the foot rim from the side. Photograph it and the app identifies it. For specific factories, start with Bourne Denby or Roseville.

If you cannot read a porcelain mark, describe it instead. Mark dictionaries have been built around this for a long time: Hooper and Phillips' *Manual of Marks on Pottery and Porcelain*, first published in 1876 and revised in 1894, groups marks under plain headings such as anchor, crown, crossed lines, star, shield and sword, lists Italian maiolica and other European factories by town, and orders East Asian marks by the number of characters.

The same book separates the marks on a single piece into three kinds: the factory mark, usually in a prominent place; the workman's or decorator's mark; and the pattern mark, usually a number that means nothing without the factory's pattern book. Knowing which of the three you are looking at stops a painter's initial being taken for a maker.

These are among the marks people ask about most. Each links to a page with the dating detail and its sources.

• Two crossed swords in underglaze blue: Meissen, established as the factory mark from 1731. See Meissen marks.
• Three wavy lines with a crown: Royal Copenhagen, founded 1775. See Royal Copenhagen marks.
• Wolfhound, harp, tower and shamrock: Belleek, with numbered marks from 1863. See Belleek marks.
• An M or N in a laurel wreath: Noritake; the N replaced the M from 1953. See Noritake marks.
• NIPPON: Japanese export ware to the US from 1891 to 1921. See the Nippon mark. OCCUPIED JAPAN dates to 1945 to 1952; see Occupied Japan marks.
• WEDGWOOD impressed: Wedgwood, from 1759. See Wedgwood marks.
• Red Chinese characters: see red marks on pottery.

A mark tells you who a piece claims to be by; the price depends on whether the piece is genuine, how early and rare it is, and its condition. The best-known marks are also the most copied: Meissen's crossed swords and Chinese imperial reign marks have both been added to later wares for centuries.

The auction record for Chinese porcelain shows how far the gap can go. A Chenghua doucai chicken cup, mark and period of Chenghua, sold at Sotheby's Hong Kong on 8 April 2014 for HK$281.24 million, about US$36.05 million, while later cups with the same mark are common and sell for a small fraction of that. Judge the body, glaze, decoration and wear against the mark before believing either.

• Scanned mark dictionaries. Hooper and Phillips (1894) and similar 19th-century books are free to read online and still cover the main European and East Asian factories.
• Maker pages on this site. The makers' marks index has dated pages for the factories people ask about most, with the sources for each date.
• Museum collection searches. Museums photograph the bases of marked pieces; searching a factory name often shows a documented example to compare.
• A photo in the app. AntiqLens reads the mark and the shape of the piece from a photo and suggests the factory and period, which you can then check on the pages above.

The mark on the base of a pot goes by several names. A printed or stamped factory mark is usually called a backstamp or base mark; the general term is maker's mark or pottery mark. On studio pottery, a small stamp pressed into the clay is called a seal or chop. A name written by hand is a signature.

The Robert Zueblin studio pottery guide lists the ways a mark can be made: pressed blind marks, cast blind marks, relief marks, stamp marks, incised marks and brush marks, applied over or under the glaze. The distinction between a stamped mark and a hand signature changes how you search; see pottery signatures for reading handwritten names.

Factory backstamps are covered by the mark books and the maker pages on this site. Studio pottery, made by individual potters in small workshops, needs its own databases, chosen by country.

• United States, 1945 to now: The Marks Project, a marks dictionary of American studio pottery with about 7,300 marks on 7,225 objects, 2,320 artist pages and 93 partner collections, searchable by mark or signature and by artist name.
• Britain and Ireland: British & Irish Studio Pottery Marks (bispm.co.uk), searchable by how the mark was made (impressed, incised, written), by each letter it contains, by reversed letters and by symbols.
• Germany, France, Switzerland, Spain, Japan and the US: the Robert Zueblin pottery marks lexicon, which suggests searching by a plain description of what you see, such as "K in a circle".
• European porcelain factories: theoldstuff.com lists marks alphabetically by manufacturer, with many variants for the big names, for example 25 Adderley marks and 36 Beswick marks.

If the piece is heavy, hand-thrown and carries only a small seal, start with the studio databases; if it has a printed backstamp with a factory name, start with the maker pages.

A pair of initials such as AD, or A.D., is one of the hardest marks to look up, because many potters and decorators used their initials and no single maker owns a two-letter monogram. We found no source that ties a plain AD pottery mark to one factory, so treat any single answer with caution.

• Check the order and orientation. Initials can be joined, stacked or reversed on a stamp; search both AD and DA, and use a reversed-letter search where the database has one.
• Decide whether it is a decorator's mark. Some factories let decorators add their own initials; at Rookwood, for example, the decorating artist's cipher is incised or inked on the base beside the factory's RP logo (Rookwood Database). Initials next to a factory mark may name the painter, not the maker.
• Search by letter, not by guess. BISPM lets you search each letter in a mark, and The Marks Project lets you search marks and signatures directly.
• Use the rest of the base. Country words, registration numbers and the way the mark was applied narrow the date and region before you search the initials (see the sections above).

Identify first, then look for sold prices of the same maker, shape and decoration. Two points from dated sources show how much the details matter.

• The maker's name. Signed work by sought-after potters has a documented market: Crocker Farm sold a George Ohr lidded teapot for $13,200 on 29 May 2026 and an Ohr vase for $5,700 on 18 November 2022.
• Marks that lower value. On Rookwood, a hand-scored X on the base marked a second or overstock piece and typically reduces value by at least 20% (Rookwood Database); artist-signed Rookwood pieces sell above plain production ware.

For valuable factory marks such as Meissen or imperial Chinese reign marks, the sections above explain why a famous mark alone proves nothing. For how condition affects price, see antique condition grading.

Research and drafting for this page were assisted by AI and checked line by line against the sources listed below. Prices are copied from the named auction report or guide with its date; where a figure could not be confirmed we say so rather than estimate. If you find an error, tell us and we will correct it.