Pottery Signatures: How to Read an Artist's Mark

A pottery signature is the potter's name or initials written by hand into the clay or onto the glaze. A pottery mark is a sign applied with a stamp. The Robert Zueblin studio pottery lexicon draws the line this way, and adds a trap: some potters had stamps made that imitate handwriting, so a very even, deep-edged "signature" may in fact be a stamp.

The difference matters for identification. A stamp repeats exactly from pot to pot, so you can match it against a photograph. A hand signature changes with the day, the tool and the clay, so you match the letter shapes and habits rather than the exact outline.

• Incised or carved: cut into the clay by hand.
• Painted or brushed: written with a brush, over or under the glaze.
• Impressed seal: a small stamp pressed into soft clay, common on studio pottery; a personal seal often sits beside a workshop seal.
• Monogram: one to three initials, often joined. The lexicon's examples include Walter Popp's lowercase wp and Otto Lindig's OL.

Most unread signatures fail at the first step, not the database. Work through this before searching.

• Photograph it twice: once with light from a low side angle so incised strokes throw shadows, once in soft even light for painted marks. Do not scrub the base.
• Write down only what you are sure of, and use a question mark for each doubtful letter. Searching a wrong guess wastes more time than searching a partial one.
• Turn the photo upside down and mirror it. Seal marks are often read in the wrong orientation, and letters on stamps can be reversed. British & Irish Studio Pottery Marks has a separate search for reversed letters for this reason.
• Separate the parts. A studio pot can carry a personal seal, a workshop seal and a country word. Look each one up on its own.
• Describe what you cannot read. The Zueblin lexicon suggests searching by what you see, for example "K in a circle", or the symbol, such as a cat or a flower.
• Check the date clue. Some potters changed their mark over their career; the potter Michael Cardew used about eight different marks, one for each pottery he worked at (antique-marks.com).

No single database covers every potter. Pick the one that matches where and when the pot was probably made.

• American studio pottery, 1945 to now: The Marks Project. It lists about 7,300 marks on 7,225 objects and 2,320 artist pages, and you can search by mark or signature, by artist name, or browse an A to Z index. It works with collections such as the Everson Museum of Art and the American Museum of Ceramic Art.
• British and Irish studio pottery: British & Irish Studio Pottery Marks (bispm.co.uk), searchable by mark type (impressed, incised, written), by each letter in the mark, by reversed letters, and by symbols such as circles, spirals, flowers and animals.
• German, French, Swiss, Spanish, Japanese and US studio potters: the Robert Zueblin pottery marks and signatures lexicons, arranged by potter surname, with a text search for a name, an abbreviation or an icon.
• Factory-made art pottery: the maker pages on this site, such as Rookwood, Moorcroft and Clarice Cliff, where decorator signatures sit beside a factory mark.

Two traditions put a personal signature next to a workshop mark, and reading both is what dates and attributes the piece.

Studio pottery seals. At the Leach Pottery in St Ives, Bernard Leach marked his pots BL, usually alongside the Leach Pottery seal. Potters who made individual pieces there added their own personal seal next to the St Ives seal (antique-marks.com). So a pot with only the pottery seal is workshop ware; a personal seal next to it names the maker. Lucie Rie used various painted and impressed marks, including early painted marks with WIEN, which shows how inconsistent a single potter's marks can be.

Art pottery decorator ciphers. At Rookwood, many pieces carry the decorating artist's cipher on the base, either incised or inked under the glaze, next to the RP logo with its date flames. The Rookwood Database notes that artist-signed pieces command higher values than production pieces, and that a hand-scored X, marking a second, typically lowers value by at least 20%. See Rookwood pottery marks for the flame dating.

A signature is worth money when it belongs to a potter collectors pursue and the pot itself is typical of that potter's best work. George E. Ohr (1857 to 1918), the Biloxi potter, is the clearest example, because his prices are well recorded.

• $100,000: a large exceptional Ohr vessel at Rago in January 2020, against a $20,000 to $30,000 estimate (Antique Trader). The same report put the auction record at the time at $125,000, set at Sotheby's more than ten years earlier.
• $13,200: a lidded teapot, Crocker Farm, 29 May 2026.
• $11,800: a star-form vase, Crocker Farm, 20 July 2019.
• $5,700: a vase, Crocker Farm, 18 November 2022.

Ohr's pieces are usually identified by impressed stamps reading G.E. OHR / BILOXI, MISS. or GEO. E. OHR / BILOXI, MISS.; a piece made in St Louis in 1904 is inscribed "Geo. E. Ohr / Expo Clay / 04" (Crocker Farm). For most studio potters there is no public price series at all, and a signature by an unknown or amateur potter adds little to value; the useful question is whether the name appears in a database with documented work and sales.

Take one photo filling the frame with the signature under low side light, one of the whole base, and one of the whole pot. AntiqLens reads the signature and the form together and suggests a maker and period; use the databases above to confirm the name against documented examples before you rely on it.

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.