Every authentic piece of Wedgwood fairyland lustre china should be marked with a pattern number. The number starts with the letter Z and it is followed by four digits. The number itself is not especially helpful. For example, Z4968 was used on dozens of different shapes, sizes, colors, and designs. The number was used for more than ten years. Some other numbers are much more specific to a certain product. As a collector or seller trying to determine a value, don’t focus too much on the pattern number as a point of reference for any Wedgwood fairyland lustre articles.