Guides to pottery markings can be found online at antique pottery websites, such as Antique-Marks.com. Encyclopedias are also available to identify the markings. Pottery marks can identify the origin and maker of various antiques including clay pottery, porcelain jars and antique china.
Marks on pottery, particularly china, often include a company logo, and sometimes the initials of the craftsman and the date the piece was made. Thousands of different logos exist, which can make identification of pottery seem daunting. German china logos are more numerous than others because of the large quantity of German china that was sold at the end of the 19th century.