Identification of Antique Pottery Begins with the Mark

QUESTION: I have what I believe to be an English ceramic plate with a mark that looks like a diamond with a bunch of letters and numbers in it. Can you tell me what that means?

ANSWER: The stamp on the back of your plate is known as a mark. Manufacturers of English pottery used this particular design between 1842 and 1883. The letters and numbers indicate the dates of the plate’s design registration with the British patent office. You can easily decipher this alpha-numeric code by checking the chart found on the Phoenix Masonry Web site or in Kovels' New Dictionary of Marks - Pottery & Porcelain: 1850 to the Present by Ralph and Terry Kovel (Crown Publishers, New York).

Pottery makers replaced this diamond-shaped registry mark with a sequential numbering system prefaced by the abbreviation Rd. No.  in 1884. Over the years, they modified the arrangement of the numbers several times, so it can be confusing. If you need specific information, you can contact the British Designs Registry Patent Office for dates registered in and after 1909 and the British Public Record Office for dates registered prior to 1909.



Sometimes, pottery and porcelain makers used word indications that spelled out the date. If the mark shows the country of origin, this means the piece dates after 1891, according to the U.S.  McKinley Tariff Law.

Often manufacturers worldwide employed words to describe their wares. These usually had start and end dates, making it easy to figure out the approximate date of a piece. For instance, the term "Nippon,” the Japanese name for Japan, indicates that piece of Japanese porcelain dates from 1891 to 1921 while "Made in Occupied Japan" shows that the piece dates from  1945 to 1952. "Semi-vitreous" means the piece appeared on the market after 1901 while "bone china" indicates that the piece dates generally from the 20th century.  The phrase "oven-proof' appeared on pottery and china after 1933, but "dishwasher proof ” didn’t appear until after 1955. Sometimes a location, such as "East Germany" can indicate a time period, which in this case extends from 1949 to1990.

If a piece of pottery or porcelain has a mark showing a design and/or maker’s name, this information may also help to date it. You’ll find loads of resources, both in print and online, to help you identify early English, European, and Asian pottery and porcelain marks.

In the United States, makers stamped patent numbers on the backs and bottoms of their pottery pieces. A patent number represents the very earliest an article could have been produced. For example, a patent number of 16,388 indicates the piece appeared after Jan. 1, 1857 but prior to Jan. 1, 1858. Therefore, it dates from 1857, the year of its patent registration. Should you discover several sequential patent number sets on one piece, you should look up the final set on a patent date chart to date the piece.

Marks on furniture, glass, and silver are another story. When a maker uses his name or logo, you may have enough information to track the date of manufacture. Often during the course of the run of a piece, the maker will use different names. Quimper pottery is a good example. As the companies consolidated the marks changed.

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Elephant Mugs and More

QUESTION: I recently bought a small mug in the shape of an elephant at a monthly flea market. It has GOP 1968 embossed under the top edge. On the bottom it says "Frankhoma" What can you tell me about this cute little mug?.

ANSWER: The mug you found was a souvenir of the Republican Party Women, created by John Frank.

After graduating from the Chicago Art Institute, John Frank moved to Norman, Oklahoma., in 1927 to establish the first Ceramic Art Department at the University of Oklahoma. In 1933 he started his own pottery company to create a line of fine art ware and sculpture that ordinary people could afford to buy. A year later, Frank's wife, Grace Lee, suggested the company name should incorporate both their family name and the last letters of their state, thus the company officially became Frankoma Pottery.

The Franks and their new business moved about 20 miles south of Tulsa to Sapulpa in 1938, but soon hardship followed. Their first building, constructed partially by Grace's father, burned down shortly after their arrival. Despite the economic hardships caused by the fire and the Great Depression, the Franks followed their vision and rebuilt.

Instead of reissuing early sculptures, such as figurines, ashtrays and vases, the Franks decided to make bookends, candleholders, wall vases, face masks and plaques following the fire. Frankoma also became the pioneer in colored tableware with bold designs in vibrant Southwestern colors such as Prairrie Green and Desert Gold. From 1942 until 1988 Frankoma created a line of wagon- wheel dinnerware that became its signature product. The Pottery also produced dinnerware in other patterns, including Mayan-Aztec, Plainsman, Lazybones, and Westwind.

In 1968 John Frank designed an elephant mug as a fundraiser for the National Republican Party. The following year it became a collectible series. The Frank’s daughter, Joniece, designed the first Democrat donkey mug in 1975. The company produced other collectibles,  including 14 Teenagers-of-the-Bible plates issued from 1972 until 1982 and Christmas plates,  first issued in 1965. From 1955 until 1967, Frankoma also manufactured earrings, pins, and tie clasps and the bolo tie designed by John Frank, who had received an award for jewelry design in 1927.

The type of clay and trademarks help collectors identify old and new Frankoma pieces. John Frank experimented with many types of clay from different areas of Oklahoma. From 1933 until 1954 he used tan clay found near Ada, Oklahoma. Collectors now call pieces made with this clay Ada Clay.        

In 1954 he switched to a brick red firing clay located a few miles from the factory in an area known as Sugar Loaf Hill. Collectors call this Sapulpa Clay Pre-1980. In the 1980s, additives affected the red brick color of the clay, and it became either a light pink or a light orange. Collectors refer to this as Sapulpa Clay Post-1980. The changes in the clay also affected the color of the glazes. Today, Ada clay pieces are generally worth the most.

Collectors today regard the pieces with Frank's initials "JNF" or '"JF” as the most desirable. During 1933 and 1934, Frank marked his firm’s wares with one of three marks—“FRANK POTTERIES NORMAN OKLAHOMA,” “FRANK POTTERIES NORMAN OKLA” or “FRANK POTTERIES.” It wasn’t until he incorporated Frankoma Potteries in February 1934 that he used a rubber stamp with the of the word “Frankoma.” He didn’t use it for long, so it’s quite rare. From late 1934 until 1954 the company used an impressed mark.

Frank also used what collectors call the cat mark from 1934 until it was destroyed in the 1938 fire. Known as the “Pot and Puma” logo, it was the company's first trademark and featured a large ceramic vase with a Taylor pacing cat in the foreground. It can be found on larger pieces. After he rebuilt the company after the fire, Frank again used an impressed Frankoma mark but this time the “O” was oblong, and not round. This Frankoma mark continued to be hand impressed until the early 1950s when the trademark was often inducted in the mold along with the mold number. However, some of the pieces made at this time had no marks since Frank never modified their molds. He often personalized pieces he gave as gifts to friends, family and special customers. His etched message and signature is definitely the most valuable mark.

After Frank’s death in 1973, his daughter Joneice took over, but in September 1983, fire once again claimed the Frankoma Pottery. The following year, after reopening, she had to declare bankruptcy. Two more owners took over the molds and tried to keep the pottery going, but in 2011, the company finally went on the auction block.