Instructions
Check to see if your piece of dinnerware has a date code stamped on it. Most china produced by Shenango Pottery Company after 1950 has a date code on it.
Check and see if any of the words "Peter Terris," "Epicure," "IncaWare," or "Interpace" are marked on the piece. These words are some of the common identifiers of dinnerware produced by the Shenango China Company, the producer of Castleton China dinnerware.
Visit your local library and look the marking on your china up in a reference book of porcelain and pottery marks.