Porcelain identification marks help collectors determine an item's manufacturer, the date it was made and its country of origin. Various forms of identification marks include maker's marks, foundry marks, engravers' signatures and design registration marks. The markers help authenticate ceramic pieces and establish their resale value.
Online reference resources, such as Kovels, Antique Marks and International Ceramic Directory, allow collectors to search for information about porcelain identification marks by entering data about the shape of the mark, initials or words into a search engine. Collectors can also learn more about their piece by searching by the item's country of origin.